2020-12-19 Tracking News

Contents on 19 December '20

IAU Minor Planet Center
- NEOCP Activity -- 44 listings
- New MPECs -- seven MPECs
Observers -- 38 observers
Impact Risk Monitoring -- sixteen objects
Chronology

CHANGES COMING: The Asteroid/Comet Connection Web site will soon focus completely on Earth's Busy Neighborhood reporting. Sometime on or soon after Sunday, December 27th, much of the site will be retired.* The Tracking News will be discontinued and taken down entirely** along with its supporting timeline pages, the archives of its predecessor online publication, Major News About Minor Objects, and our even longer running Consolidated Risk Tables feature. Remaining will be Earth's Busy Neighborhood along with its sky chart, ephemerides, and some supporting pages (e.g. Observatory Links). We do plan to make the Web site easier to use, more interesting as regards close-passing asteroids, and more glitch-free while needing much, much less manual attention here than the current site. -- Webmaster

*There may be some brief chaos when we take down the old site and put up the new. Please check back.
**You can still find the old files at the Internet Archive.

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1244 risk-listed objects, 167 have had news in the last 31 days. Updated at 2301 UTC on 19 Dec.
Earth's Busy Neighborhood traffic page
Ephemerides for risk-listed objects & close passers
News archive (old) & news image catalog (discontinued)
Object Links - mainly for radar targets & close passers (mostly discontinued)
Observing Campaigns (old)

The latest A/CC news is available via framed access, RSS news feed, or redirection.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity on 19 December '20

The MPC's NEO Confirmation Page has 44 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 44 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 57 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs on 19 December '20

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2020-Y49 time-stamped "02:29 UT" - 2020 YW - see below
MPEC 2020-Y50 time-stamped "07:16 UT" - 2020 YZ - see below
MPEC 2020-Y51 time-stamped "12:30 UT" - Daily Orbit Update - see below
MPEC 2020-Y52 time-stamped "15:19 UT" - 2015 XW128 - see below
MPEC 2020-Y53 time-stamped "15:32 UT" - 2020 YA1 - see below
MPEC 2020-Y54 time-stamped "23:41 UT" - 2020 YB1 - see below
MPEC 2020-Y55 time-stamped "23:42 UT" - 2020 YC1

MPEC 2020-Y55 - "23:42 UT" - 2020 YC1

K20Y01C 2020 YC1 (small asteroid, H=26.8 ~15m) was picked up at 0438 UT on 19 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 18.22-23p3 and 19.19-21p4. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Dec. 19.31-32p4), program code 1 via Schwarzschild Obs. (Dec. 19.70p4 at V=21.1-22.6), and Great Shefford Obs. (Dec. 19.83-87p4).

MPEC 2020-Y54 - "23:41 UT" - 2020 YB1

K20Y01B 2020 YB1 (small asteroid, Earth MOID=0.8 LD, H=26.7 ~15m) was picked up at 1006 UT on 18 Dec. by MLS, observing it at Dec. 18.42-44p4. This detection was confirmed by Pan-STARRS 1 (PS1) (Dec. 17.53-57p3), the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 18.50-51p4), Schwarzschild Obs./code 1 (Dec. 18.99p3 at V=21.8-22.3 & 19.17p4 at V=21.5-8), Steward Mt. Lemmon Sta. (Dec. 19.34-36p4), and program code 1 via KLENOT (Dec. 19.96p6).

MPEC 2020-Y53 - "15:32 UT" - 2020 YA1

K20Y01A 2020 YA1 (risk listed, Earth MOID=0.1 LD, H=26.7 ~15m, close passer) was picked up at 0942 UT on 17 Dec. by MLS, observing it at Dec. 17.40-42p4. This detection was confirmed by CSS-Kuiper (Dec. 17.49-50p4), Schwarzschild Obs./code 1 (Dec. 17.99p3, 19.03p3 & 19.16-17p3), Astronomical Research Obs. Westfield (Dec. 18.34-35p3), Sandlot Obs. (Dec. 19.32-36p4), and Steward Mt. Lemmon Sta. (Dec. 19.36p3).

MPEC 2020-Y52 - "15:19 UT" - 2015 XW128

K15XC8W 2015 XW128 (H=20.0 ~339m) from Pan-STARRS 2 (PS2) (Dec. 7.49-52p3), MLS (Dec. 19.29-30p4 at G=21.43-22.16), and CSS-Kuiper (Dec. 19.43-44p3)

<< DOU on 19 December '20 >> MPEC 2020-Y51 - "12:30 UT" - Daily Orbit Update

Observations of risk-listed objects
K20Y00N 2020 YN (small asteroid, arc=2 days, H=27.6 ~10m, close passer) from Schwarzschild Obs./code 1 (Dec. 18.89-90p4 at V=22.4-23.0) and CSS-Kuiper (Dec. 19.09-10p4)
K20Y00L 2020 YL (small asteroid, arc=2 days, H=26.8 ~15m) from Schwarzschild Obs./code 1 (Dec. 18.77p5)
K20Y00F 2020 YF (small asteroid, Q=0.988 AU, arc=2 days, H=28.9 ~6m, close passer, NHATS target) from Oberfrauendorf Obs. (Dec. 17.99p3), Schwarzschild Obs./code 1 (Dec. 18.71p3), Dettelbach Vineyard Obs. (Dec. 18.77-78p3), Buchloe Obs. (Dec. 18.77-78p3), and Steward Mt. Lemmon Sta. (Dec. 19.08p3)
K20X07B 2020 XB7 (small asteroid, arc=4 days, H=24.2 ~49m, close passer) from the Spacewatch 1.8m telescope (Dec. 19.18-21p3)
K20X06V 2020 XV6 (small asteroid, q=0.185 AU, arc=4 days, H=22.7 ~98m) from Steward Mt. Lemmon Sta. (Dec. 19.08p4)
K20X06U 2020 XU6 (arc=5 days, H=21.4 ~178m) from Steward Mt. Lemmon Sta. (Dec. 19.25-27p4) and the Spacewatch 0.9m telescope (Dec. 19.46-47p3)
K20X06A 2020 XA6 (small asteroid, arc=5 days, H=24.0 ~54m) from Steward Mt. Lemmon Sta. (Dec. 19.09p4)
K20X03X 2020 XX3 (small asteroid, arc=7 days, H=28.5 ~7m, close passer, NHATS target) from Sormano Obs. (Dec. 17.83p5)
K20X03E 2020 XE3 (small asteroid, Q=4.523 AU, arc=13 days, H=24.9 ~35m) from UH/Tholen NEO Follow-Up 2.24m Telescope (Dec. 16.32p1 at G=22.37), ARO Westfield (Dec. 18.18-20p3 at V=22.1-2), and CSS-Kuiper (Dec. 19.30-33p3 at G=22.20-30)
K20X01K 2020 XK1 (small asteroid, arc=1 day, H=30.6 ~3m, close passer, NHATS target) from MLS (Dec. 6.15-16p4) and Sertao de Itaparica Obs. (OASI) (Dec. 8.28-29p2)
K20X00F 2020 XF (small asteroid, arc=15 days, H=26.7 ~15m, close passer, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 19.10-11p4) and Spacewatch 0.9m (Dec. 19.13-16p2)
K20V00W 2020 VW (small asteroid, arc=15 days, H=28.3 ~7m, close passer, NHATS target) from the Catalina Sky Survey (CSS) (Nov. 3.30-32p2)
Observations of recently (no longer) risk-listed objects
K20X05K 2020 XK5 (small asteroid, Q=4.130 AU, arc=7 days, H=23.7 ~62m) from Spacewatch 1.8m (Dec. 19.23-27p3 at R=22.5)
K20X01G 2020 XG1 (almost small, i=50.3°, arc=14 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 19.16-17p4)
K20W00G 2020 WG (Q=4.014 AU, arc=33 days, H=21.7 ~155m) from MLS (Dec. 18.22-23p3) and Steward Mt. Lemmon Sta. (Dec. 19.37-39p4 at G=21.17-22.54)
K20V03X 2020 VX3 (Q=4.481 AU, arc=38 days, H=21.5 ~170m) from ARO Westfield (Dec. 18.20-22p4 at V=22.1-5)
Observations of close-passing objects
K20Y00U 2020 YU (arc=2 days, H=25.5 ~27m) from Dettelbach Vineyard Obs. (Dec. 19.18p3)
K20Y00G 2020 YG (arc=3 days, H=28.2 ~8m) from Schwarzschild Obs./code 1 (Dec. 18.72p3) and Steward Mt. Lemmon Sta. (Dec. 19.11p4)
K20Y00B 2020 YB (arc=3 days, H=29.1 ~5m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 18.72p3) and Steward Mt. Lemmon Sta. (Dec. 19.12p4)
K20X06J 2020 XJ6 (arc=5 days, H=27.3 ~12m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 19.06p2 at V=21.6-22.1)
K20X06H 2020 XH6 (arc=5 days, H=27.0 ~13m) from Schwarzschild Obs./code 1 (Dec. 18.73p5 & 19.20p3) and Steward Mt. Lemmon Sta. (Dec. 19.19p3)
K20X05S 2020 XS5 (arc=9 days, H=26.6 ~16m) from Schwarzschild Obs./code 1 (Dec. 18.75-76p6 at V=21.4-22.1)
K20X04Z 2020 XZ4 (arc=8 days, H=24.7 ~39m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 18.91p3 & 19.14p3)
K20X04Y 2020 XY4 (arc=8 days, H=27.0 ~13m, NHATS target) from San Marcello Pistoiese Obs. (Dec. 18.83p3), Schwarzschild Obs./code 1 (Dec. 18.87p3 & 19.11-12p4), and the Zwicky Transient Facility (ZTF) (Dec. 19.30-32p4)
K20X03J 2020 XJ3 (arc=10 days, H=25.6 ~26m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 18.71p3, 19.14p3 & 19.22p3)
K20X01H 2020 XH1 (arc=12 days, H=22.9 ~89m) from M. Kumrucu-Lohmiller via Slooh.com Chile Obs. (Dec. 18.21-22p2)
K20T12B 2020 TB12 (arc=65 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (Dec. 19.21-23p4)
K20S05S 2020 SS5 (arc=18 days, H=24.9 ~35m) from ATLAS Haleakala (Sept. 25.57-58p3)
K20O05K 2020 OK5 (arc=158 days, H=25.4 ~28m, NHATS target) from MLS (Dec. 18.42-44p4)
K18X04E 2018 XE4 (arc=2 opp, H=26.5 ~17m) from Schwarzschild Obs./code 1 (Dec. 18.90p3)
K12UH1K 2012 UK171 (arc=3 opp, H=24.5 ~43m, NHATS target) from Mirasteilas Obs. (Dec. 19.03-04p3)
o1647 501647 2014 SD224 from Wickede Obs. (Dec. 18.77-79p9)
Observation campaigns (NHATS targets, radar support)
K20Y00C 2020 YC (arc=3 days, H=26.1 ~20m, NHATS) from Schwarzschild Obs./code 1 (Dec. 18.87p3) and Steward Mt. Lemmon Sta. (Dec. 19.14p4)
K20X06M 2020 XM6 (arc=13 days, H=25.7 ~25m, NHATS) from CSS-Kuiper (Dec. 19.36-37p3)
K20X05Z 2020 XZ5 (arc=59 days, H=25.8 ~23m, NHATS) from Schwarzschild Obs./code 1 (Dec. 18.80-82p4 at V=23.2-6)
K20X04J 2020 XJ4 (arc=99 days, H=24.7 ~39m, NHATS) from ARO Westfield (Dec. 18.00-01p2 at V=22.2-4)
K20X00W 2020 XW (arc=14 days, H=24.7 ~39m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 19.19p4)
K20W03F 2020 WF3 (arc=28 days, H=23.6 ~65m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 19.40-41p3)
K20T01Z 2020 TZ1 (arc=72 days, H=24.2 ~49m, NHATS) from CSS-Kuiper (Dec. 19.23-24p4 at G=21.79-23.15)
K20S00O 2020 SO (Q=0.988 AU, arc=32 days, H=28.5 ~7m, NHATS) from Castelmartini Obs. (Nov. 23.92-93p3), Schwarzschild Obs./code 1 (Dec. 18.74-75p3), and CSS (Dec. 19.13-15p4)
K13Y02S 2013 YS2 (arc=2 opp, H=23.6 ~65m, NHATS) from Squirrel Valley Obs. (Dec. 19.05-06p3)
-- NHATS target table
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y00W 2020 YW (q=0.363 AU, arc=2 days, H=23.0 ~85m) from Schwarzschild Obs./code 1 (Dec. 19.10p4) and Steward Mt. Lemmon Sta. (Dec. 19.21p4)
K20Y00M 2020 YM (arc=2 days, H=26.9 ~14m) from Schwarzschild Obs./code 1 (Dec. 19.02p4) and Steward Mt. Lemmon Sta. (Dec. 19.30-31p4)
K20Y00J 2020 YJ (arc=3 days, H=23.3 ~74m) from LCO Cerro Tololo C (Dec. 17.22p3) and Steward Mt. Lemmon Sta. (Dec. 19.26-27p4)
K20Y00E 2020 YE (Q=4.347 AU, arc=13 days, H=24.2 ~49m) from Schwarzschild Obs./code 1 (Dec. 18.88p3) and Steward Mt. Lemmon Sta. (Dec. 19.37p4)
K20Y00D 2020 YD (arc=3 days, H=25.0 ~34m) from Steward Mt. Lemmon Sta. (Dec. 19.11-12p2)
K20Y00A 2020 YA (arc=14 days, H=25.7 ~25m) from Steward Mt. Lemmon Sta. (Dec. 18.51-52p4) and Schwarzschild Obs./code 1 (Dec. 19.02p3 & 19.20p4)
K20X06X 2020 XX6 (q=0.260 AU, arc=4 days, H=24.1 ~51m) from Schwarzschild Obs./code 1 (Dec. 19.12p2 at V=22.8-23.0)
K20X06Q 2020 XQ6 (q=0.325 AU, arc=5 days, H=23.2 ~78m) from Schwarzschild Obs./code 1 (Dec. 18.91-92p3 at V=20.2-3 & 19.21p4 at V=21.9-22.4)
K20X06P 2020 XP6 (arc=5 days, H=26.3 ~19m) from Schwarzschild Obs./code 1 (Dec. 18.92-93p2 at V=21.9-23.0)
K20X06G 2020 XG6 (arc=5 days, H=24.3 ~47m) from CSS-Kuiper (Dec. 19.28-29p4 at G=21.51-22.02)
K20X06F 2020 XF6 (Q=4.023 AU, arc=7 days, H=22.3 ~117m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 18.28p3 at G=22.0-22.1) and CSS-Kuiper (Dec. 18.50-52p4)
K20X06D 2020 XD6 (arc=5 days, H=25.2 ~31m) from Schwarzschild Obs./code 1 (Dec. 18.89p2 at V=22.5-8) and Steward Mt. Lemmon Sta. (Dec. 19.16p3)
K20X06B 2020 XB6 (i=55.2°, arc=5 days, H=22.6 ~102m) from Steward Mt. Lemmon Sta. (Dec. 19.08-09p3)
K20X03V 2020 XV3 (arc=10 days, H=22.8 ~93m) from Steward Mt. Lemmon Sta. (Dec. 19.33-34p4)
K20X03S 2020 XS3 (arc=10 days, H=25.3 ~29m) from Schwarzschild Obs./code 1 (Dec. 18.76p3 at V=21.7-22.2)
K20X03N 2020 XN3 (arc=14 days, H=22.9 ~89m) from Steward Mt. Lemmon Sta. (Dec. 19.17-18p3)
K20X03M 2020 XM3 (arc=13 days, H=22.8 ~93m) from Steward Mt. Lemmon Sta. (Dec. 19.43p3)
K20X03G 2020 XG3 (arc=10 days, H=25.1 ~32m) from Schwarzschild Obs./code 1 (Dec. 19.01-02p3 at V=22.2-8)
K20X03F 2020 XF3 (arc=10 days, H=25.6 ~26m) from Schwarzschild Obs./code 1 (Dec. 18.88-89p4 & 19.13p3)
K20X03C 2020 XC3 (arc=10 days, H=22.4 ~112m) from Steward Mt. Lemmon Sta. (Dec. 19.15p4)
K20X03A 2020 XA3 (arc=11 days, H=24.4 ~45m) from Schwarzschild Obs./code 1 (Dec. 18.71-72p3), San Marcello Pistoiese Obs. (Dec. 18.84-85p4), and Steward Mt. Lemmon Sta. (Dec. 19.07p4)
K20X02K 2020 XK2 (arc=11 days, H=23.1 ~81m) from ARO Westfield (Dec. 18.09-10p3 at V=22.0-22.3)
K20X02D 2020 XD2 (arc=12 days, H=24.2 ~49m) from MLS (Dec. 16.27-28p4) and Schwarzschild Obs./code 1 (Dec. 18.94p2 at V=22.5-6)
K20X01U 2020 XU1 (arc=38 days, H=22.3 ~117m) from CSS-Kuiper (Dec. 19.33-34p4 at G=22.33-40)
K20X01R 2020 XR1 (arc=13 days, H=23.7 ~62m) from CSS-Kuiper (Dec. 19.06-08p3)
K20X00Y 2020 XY (arc=13 days, H=25.6 ~26m) from Schwarzschild Obs./code 1 (Dec. 18.77p3)
K20X00V 2020 XV (arc=13 days, H=23.9 ~56m) from MLS (Dec. 18.32-34p3)
K20X00M 2020 XM (arc=39 days, H=22.1 ~129m) from Spacewatch 0.9m (Dec. 19.31-34p2)
K20W04N 2020 WN4 (arc=36 days, H=22.5 ~107m) from MLS (Dec. 18.49-51p4)
K20W03C 2020 WC3 (arc=28 days, H=22.4 ~112m) from Steward Mt. Lemmon Sta. (Dec. 19.33p4)
K20V05Y 2020 VY5 (arc=35 days, H=24.4 ~45m) from Schwarzschild Obs./code 1 (Dec. 19.04-05p3 at V=22.4-9)
K20V03Q 2020 VQ3 (arc=39 days, H=22.8 ~93m) from Steward Mt. Lemmon Sta. (Dec. 19.37p4)
K20U08M 2020 UM8 (arc=62 days, H=25.2 ~31m) from Steward Mt. Lemmon Sta. (Dec. 19.41-42p4)
K20R11Q 2020 RQ11 (arc=97 days, H=22.3 ~117m) from Steward Mt. Lemmon Sta. (Dec. 19.25-26p4)
K20P07K 2020 PK7 (arc=151 days, H=23.2 ~78m) from MLS (Dec. 18.24-25p4)
K18X03U 2018 XU3 (arc=2 opp, H=25.4 ~28m) from Schwarzschild Obs./code 1 (Dec. 18.75p5 at V=21.2-8 & 19.22p2 at V=23.2-3)
K18G04E 2018 GE4 (arc=4 opp, H=22.1 ~129m) from ARO Westfield (Dec. 18.33-35p3 at V=22.2-4)
K07U12S 2007 US12 (arc=6 opp, H=22.1 ~129m) from Spacewatch 1.8m (Dec. 19.31-33p3 at R=22.2)
K05W00Z 2005 WZ (arc=2 opp, H=22.8 ~93m) from ARO Westfield (Dec. 18.24-26p3 at V=22.3)
K20Y00K 2020 YK (i=38.8°, arc=3 days, H=21.8 ~148m) from CSS-Kuiper (Dec. 19.25-26p4)
K20Y00H 2020 YH (arc=3 days, H=21.9 ~141m) from Steward Mt. Lemmon Sta. (Dec. 19.12-13p4)
K20X02P 2020 XP2 (arc=11 days, H=22.0 ~135m) from MLS (Dec. 18.47-49p4)
K20X00P 2020 XP (arc=32 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 19.29p4)
K20W02F 2020 WF2 (Q=4.253 AU, arc=30 days, H=22.0 ~135m) from Spacewatch 0.9m (Dec. 19.13-19p3)
K20W01G 2020 WG1 (arc=65 days, H=22.0 ~135m) from ARO Westfield (Dec. 18.05-07p3 at V=22.2-3)
K14N63E 2014 NE63 (arc=134 days, H=21.8 ~148m) from PS1 (2014 Nov. 5.38-41p3)
K14N39C 2014 NC39 (arc=117 days, H=21.8 ~148m) from PS1 (2014 Sept. 18.52-55p3)
Observations of other objects
K20Y00Z 2020 YZ (arc=8 days, H=21.5 ~170m) from CSS-Kuiper (Dec. 19.44-46p4)
K20X07C 2020 XC7 (arc=4 days, H=20.6 ~257m) from Steward Mt. Lemmon Sta. (Dec. 19.18-19p4)
K20X05M 2020 XM5 (arc=7 days, H=20.2 ~309m) from Holmes/CTIO (Dec. 18.26-27p3) and ARO Westfield (Dec. 18.37-38p3 at V=22.2-4)
K20X05C 2020 XC5 (Q=4.138 AU, arc=7 days, H=20.9 ~224m) from Steward Mt. Lemmon Sta. (Dec. 19.15p4)
K20X04A 2020 XA4 (arc=10 days, H=21.1 ~204m) from Steward Mt. Lemmon Sta. (Dec. 19.43-44p4)
K20X03Y 2020 XY3 (arc=10 days, H=20.4 ~282m) from CSS-Kuiper (Dec. 19.35-36p3)
K20X03L 2020 XL3 (arc=10 days, H=21.2 ~195m) from CSS (Dec. 18.36-38p4), Dettelbach Vineyard Obs. (Dec. 19.09-10p3), and Steward Mt. Lemmon Sta. (Dec. 19.24-25p4)
K20X03K 2020 XK3 (i=57.4°, arc=10 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (Dec. 19.14-15p4)
K20X03H 2020 XH3 (arc=10 days, H=20.7 ~245m) from Steward Mt. Lemmon Sta. (Dec. 19.08p4)
K20X02C 2020 XC2 (arc=13 days, H=21.5 ~170m) from CSS-Kuiper (Dec. 19.13-16p4 at G=21.43-22.21)
K20X01N 2020 XN1 (i=36.8°, Q=4.009 AU, arc=31 days, H=19.6 ~407m) from Squirrel Valley Obs. (Dec. 19.05-06p3)
K20X01M 2020 XM1 (arc=13 days, H=21.5 ~170m) from CSS-Kuiper (Dec. 19.19-20p4) and Spacewatch 0.9m (Dec. 19.22-26p2 at R=21.5-22.5)
K20X01F 2020 XF1 (i=51.9°, arc=14 days, H=21.7 ~155m) from CSS-Kuiper (Dec. 19.18-19p4)
K20W05S 2020 WS5 (i=40.9°, Q=4.060 AU, arc=22 days, H=20.7 ~245m) from CSS (Dec. 18.32-34p3) and Steward Mt. Lemmon Sta. (Dec. 19.49p4)
K20W05C 2020 WC5 (arc=23 days, H=20.1 ~323m) from Steward Mt. Lemmon Sta. (Dec. 18.52p4)
K20W05A 2020 WA5 (arc=24 days, H=21.5 ~170m) from Drebach Obs. (Dec. 18.95p5) and Dettelbach Vineyard Obs. (Dec. 19.11p3)
K20W04J 2020 WJ4 (arc=35 days, H=20.9 ~224m) from Spacewatch 0.9m (Dec. 19.45-46p3)
K20W03T 2020 WT3 (i=58.6°, arc=45 days, H=18.9 ~562m) from CSS-Kuiper (Dec. 19.21p4)
K20W03M 2020 WM3 (i=40.4°, arc=28 days, H=18.5 ~676m) from Steward Mt. Lemmon Sta. (Dec. 18.52-54p4) and MLS (Dec. 18.54-55p4)
K20W02H 2020 WH2 (Q=4.568 AU, arc=31 days, H=20.0 ~339m) from Spacewatch 0.9m (Dec. 19.44-46p5)
K20W00S 2020 WS (Q=4.126 AU, arc=83 days, H=19.9 ~355m) from Steward Mt. Lemmon Sta. (Dec. 19.27-28p4 at G=20.53-22.31)
K20V06Q 2020 VQ6 (arc=34 days, H=21.2 ~195m) from CSS (Dec. 18.30-32p3), Mirasteilas Obs. (Dec. 18.90-92p4), Dettelbach Vineyard Obs. (Dec. 18.90-91p3), and Squirrel Valley Obs. (Dec. 19.01-03p3)
K20V03N 2020 VN3 (arc=39 days, H=20.3 ~295m) from Schwarzschild Obs./code 1 (Dec. 19.13p3)
K20U06R 2020 UR6 (arc=98 days, H=20.8 ~234m) from Steward Mt. Lemmon Sta. (Dec. 18.51p4)
K20U03U 2020 UU3 (Q=4.967 AU, arc=88 days, H=21.0 ~214m) from Steward Mt. Lemmon Sta. (Dec. 19.20-21p4)
K20T04G 2020 TG4 (Q=4.171 AU, arc=90 days, H=20.0 ~339m) from BAS Obs. (Dec. 18.87-88p3)
K20S04E 2020 SE4 (arc=91 days, H=20.4 ~282m) from MLS (Dec. 18.35-37p4)
K20R09O 2020 RO9 (Q=4.238 AU, arc=95 days, H=18.5 ~676m) from Steward Mt. Lemmon Sta. (Dec. 18.49-51p4)
K20Q06U 2020 QU6 (arc=114 days, H=18.1 ~812m) from Steward Mt. Lemmon Sta. (Dec. 19.22-24p4)
K20Q04M 2020 QM4 (arc=122 days, H=18.6 ~645m) from Steward Mt. Lemmon Sta. (Dec. 19.29-33p4)
K20O08C 2020 OC8 (arc=187 days, H=20.7 ~245m) from Spacewatch 0.9m (Dec. 19.37-39p2)
K20O07C 2020 OC7 (arc=176 days, H=20.8 ~234m) from Spacewatch 0.9m (Dec. 19.42-44p3)
K20N01B 2020 NB1 (q=0.353 AU, Q=4.277 AU, arc=41 days, H=20.5 ~269m) from ARO Westfield (July 29.11-13p3 at V=22.1-6)
K20H05S 2020 HS5 (arc=38 days, H=20.0 ~339m) from ARO Westfield (May 13.10-11p3 at V=22.1-3)
K19B01O 2019 BO1 (arc=3 opp, H=19.6 ~407m) from MLS (Dec. 18.42-44p4)
K18L04M 2018 LM4 from Steward Mt. Lemmon Sta. (Dec. 18.49-50p3)
K17S14N 2017 SN14 (arc=4 opp, H=18.8 ~589m) from Steward Mt. Lemmon Sta. (Dec. 19.21-22p3)
K17Q17F 2017 QF17 (arc=4 opp, H=19.8 ~371m) from CSS-Kuiper (Dec. 18.48-49p4 at G=21.18-22.03 & 19.46-47p4 at G=21.30-54)
K16O05P 2016 OP5 (arc=4 opp, H=20.9 ~224m) from CSS (Dec. 18.23-24p3)
K16J33U 2016 JU33 (arc=2 opp, H=20.9 ~224m) from Spacewatch 0.9m (Dec. 19.29-35p3)
K16E85D 2016 ED85 (Q=5.062 AU, arc=3 opp, H=17.6 ~1.02 km) from CSS (Dec. 18.53-54p4)
K14V01U 2014 VU1 (arc=4 opp, H=18.6 ~645m) from MLS (Dec. 18.50-51p4 at G=21.06-22.21)
K14R11Y 2014 RY11 (arc=114 days, H=20.5 ~269m) from PS1 (2014 Aug. 14.48-49p2)
K14Qa2T 2014 QT362 (arc=2 opp, H=20.7 ~245m) from PS1 (2014 Aug. 20.53-57p4)
K14Q02T 2014 QT2 (arc=132 days, H=20.0 ~339m) from PS1 (2014 June 20.44-46p2)
K13W67N 2013 WN67 (arc=4 opp, H=18.2 ~776m) from MLS (Dec. 18.20-21p4)
K13U14X 2013 UX14 (arc=4 opp, H=18.2 ~776m) from MLS (Dec. 18.30-32p4)
K12X17E 2012 XE17 (arc=3 opp, H=20.2 ~309m) from MLS (Dec. 18.52-53p4)
K11J01X 2011 JX1 (arc=6 opp, H=18.0 ~851m) from ARO Westfield (Dec. 18.41-43p3 at V=22.1-3)
K10X11D 2010 XD11 (q=0.326 AU, Q=4.099 AU, arc=5 opp, H=17.9 ~891m) from ARO Westfield (Dec. 18.30-31p3 at V=22.3-6)
K09S19T 2009 ST19 (arc=5 opp, H=18.3 ~741m) from MLS (Dec. 18.35-37p4)
K08B22C 2008 BC22 (arc=4 opp, H=19.8 ~371m) from ARO Westfield (Dec. 18.40p3 at V=22.3-5)
K07T08G 2007 TG8 (Q=4.305 AU, arc=3 opp, H=18.5 ~676m) from CSS (Dec. 18.55-56p3)
K03Y01M 2003 YM1 (arc=3 opp, H=18.2 ~776m) from CSS (Dec. 18.38-40p4)
K03Y00J 2003 YJ (arc=4 opp, H=20.3 ~295m) from BAS Obs. (Dec. 18.83-84p3)
K02T67S 2002 TS67 (arc=6 opp, H=19.1 ~513m) from CSS (Dec. 18.35p3)
K02L03G 2002 LG3 (Q=4.124 AU, arc=3 opp, H=19.9 ~355m) from Spacewatch 0.9m (Dec. 19.43-44p3)
K02G08Z 2002 GZ8 (Q=4.633 AU, arc=4 opp, H=18.7 ~616m) from MLS (Dec. 18.49-51p4) and Dettelbach Vineyard Obs. (Dec. 19.21-22p3)
K01Y03V 2001 YV3 (arc=3 opp, H=20.7 ~245m) from Mirasteilas Obs. (Dec. 19.05-07p6) and Dettelbach Vineyard Obs. (Dec. 19.12p3)
K00T28V 2000 TV28 (arc=5 opp, H=21.6 ~162m) from ARO Westfield (Dec. 18.30-31p3 at V=22.2)
J98W02A 1998 WA2 (Q=4.271 AU, arc=2 opp, H=19.8 ~371m) from Castelmartini Obs. (Nov. 23.96p3)
J97W23Q 1997 WQ23 (arc=3 opp, H=20.8 ~234m) from ARO Westfield (Dec. 18.35p2 at V=22.3-5)
n7094 497094 2004 AH from CSS (Dec. 18.44-46p4)
m6001 486001 2012 MR7 from MLS (Dec. 17.14-15p4)
m4199 484199 2006 WS1 from ARO Westfield (Dec. 18.37-39p3 at V=21.7-22.2)
g8086 428086 2006 NM from MLS (Dec. 18.22-23p4)
f6694 416694 2004 YR32 from CSS (Dec. 18.40-42p4)
f5029 415029 2011 UL21 from MLS (Dec. 18.35-37p8)
Z1370 351370 2005 EY from MLS (Dec. 18.40-42p4)
Y9074 349074 2007 BM8 from MLS (Dec. 18.47-49p4)
S3729 283729 2002 UX from BAS Obs. (Dec. 18.89-91p3)
R6409 276409 2002 YN2 from CSS (Dec. 17.49-51p3)
J0208 190208 2006 AQ from CSS (Dec. 18.50-52p4)
G3902 163902 2003 SW222 from Drebach Obs. (Dec. 18.95p5)
G3364 163364 2002 OD20 from CSS (Dec. 18.23-25p4)
G2173 162173 Ryugu (1999 JU3) from Shinshiro Obs. (Dec. 17.41-43p3)
F4330 154330 2002 VX94 from Castelmartini Obs. (Nov. 23.95p3) and MLS (Dec. 18.20-21p4)
F2978 152978 2000 GJ147 from MLS (Dec. 18.20-21p4)
F2941 152941 2000 FM10 from CSS (Dec. 18.50-52p4)
D8947 138947 2001 BA40 from Squirrel Valley Obs. (Dec. 19.08-10p3)
D7925 137925 2000 BJ19 from CSS (Dec. 18.54p2)
89355 89355 2001 VS78 from AstroColauri Obs. (Dec. 16.91-93p3) and CSS (Dec. 18.38-40p4)
66272 66272 1999 JW6 from Drebach Obs. (Dec. 18.94p5)
39572 39572 1993 DQ1 from MLS (Dec. 18.30-32p4)
25330 25330 1999 KV4 from SATINO-1 (2019 Sept. 9.02-05p6)
23183 23183 2000 OY21 from CSS (Dec. 18.54-56p4)
21088 21088 Chelyabinsk (1992 BL2) from CSS (Dec. 18.41-42p3)
16834 16834 1997 WU22 from CSS (Dec. 18.24-25p4)
10150 10150 1994 PN from CSS (Dec. 18.44-46p4)
08507 8507 1991 CB1 from MLS (Dec. 18.40-42p4)
08037 8037 1993 HO1 from CSS (Dec. 18.53-54p4)
05836 5836 1993 MF from BAS Obs. (Dec. 18.85-86p3)
05131 5131 1990 BG from CSS (Dec. 18.54-56p4)
04953 4953 1990 MU from AAAA Buenos Aires Obs. (Dec. 12.06-08p2)
04503 4503 Cleobulus (1989 WM) from NEOWISE (Dec. 17.44p1, 17.57p1, 17.70p1, 17.83p1, 17.90p1 & 17.96p1)
01863 1863 Antinous (1948 EA) from MLS (Dec. 18.20-21p4)
01580 1580 Betulia (1950 KA) from MLS (Dec. 18.28-30p4)
00887 887 Alinda (1918 DB) from BAS Obs. (Dec. 18.76p3)

MPEC 2020-Y50 - "07:16 UT" - 2020 YZ

K20Y00Z 2020 YZ (H=21.52 ~168m) was picked up at 1042 UT on 18 Dec. by MLS, observing it at Dec. 18.45-47p4. This detection was confirmed by PS2 (Dec. 11.53-54p2), Steward Mt. Lemmon Sta. (Dec. 18.52-53p4), and Schwarzschild Obs./code 1 (Dec. 18.99-00p4 at V=21.8-22.3 & 19.18-19p4 at V=22.2-23.4).

MPEC 2020-Y49 - "02:29 UT" - 2020 YW

K20Y00W 2020 YW (small asteroid, q=0.363 AU, H=22.9 ~89m) was picked up at 0947 UT on 17 Dec. by ATLAS Haleakala, observing it at Dec. 17.41-47p4 and 17.52p4. This detection was confirmed by CSS (Dec. 17.19-21p2), Xingming Obs. #3 (Dec. 17.71p5), Schwarzschild Obs./code 1 (Dec. 17.75p3, 18.13p3 & 18.70p3), Sormano Obs. (Dec. 17.79p3), Drebach Obs. (Dec. 17.91p3 & 18.93p3), Schiaparelli Obs. (Dec. 17.99p3), ARO Westfield (Dec. 18.14-15p4), San Marcello Pistoiese Obs. (Dec. 18.77p3), Squirrel Valley Obs. (Dec. 18.99p3), and Dettelbach Vineyard Obs. (Dec. 19.07-09p3).

Observers on 19 December '20

A total of 38 observers appear in today's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2020-Y51 -- 4953
`L74`	AstroColauri Obs., 1 in MPEC 2020-Y51 -- 89355
`H21`	Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2020-Y49, 2020-Y51 & 2020-Y53 -- 2020 YW, 2020 YA1, 2020 XM5, 2020 XK2, 2020 XJ4, 2020 XE3, 2020 WG1, 2020 VX3, 2020 NB1, 2020 HS5, 2018 GE4, 2011 JX1, 2010 XD11, 2008 BC22, 2005 WZ, 2000 TV28, 1997 WQ23, 484199
`T05`	ATLAS Haleakala in Hawaii, 2 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 SS5
`G17`	BAS Obs., 5 in MPEC 2020-Y51 -- 2020 TG4, 2003 YJ, 283729, 5836, 887
`215`	Buchloe Obs. in Germany, 1 in MPEC 2020-Y51 -- 2020 YF
`160`	Castelmartini Obs. in Italy, 3 in MPEC 2020-Y51 -- 2020 SO, 1998 WA2, 154330
`703`	Catalina Sky Survey (CSS) in Arizona, 25 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 XL3, 2020 WS5, 2020 VW, 2020 VQ6, 2020 SO, 2016 OP5, 2016 ED85, 2007 TG8, 2003 YM1, 2002 TS67, 89355, 497094, 416694, 276409, 23183, 21088, 190208, 16834, 163364, 152941, 137925, 10150, 8037, 5131
`V06`	Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 19 in MPECs 2020-Y51, 2020-Y52, 2020-Y53 & 2020-Y54 -- 2020 YZ, 2020 YN, 2020 YK, 2020 YB1, 2020 YA1, 2020 XY3, 2020 XU1, 2020 XR1, 2020 XM6, 2020 XM1, 2020 XG6, 2020 XF6, 2020 XF1, 2020 XE3, 2020 XC2, 2020 WT3, 2020 TZ1, 2017 QF17, 2015 XW128
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2020-Y51 -- 2020 XM5, 2020 XF6
`K87`	Dettelbach Vineyard Obs. in Germany, 8 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 YU, 2020 YF, 2020 XL3, 2020 WA5, 2020 VQ6, 2002 GZ8, 2001 YV3
`113`	Drebach Obs. in Germany, 4 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 WA5, 66272, 163902
`J95`	Great Shefford Obs. in England, 1 in MPEC 2020-Y55 -- 2020 YC1
`2461`	program code 1 via KLENOT in the Czech Republic, 1 in MPEC 2020-Y54 -- 2020 YB1
`W87`	LCO Cerro Tololo C in Chile, 1 in MPEC 2020-Y51 -- 2020 YJ
`B67`	Mirasteilas Obs. in Switzerland, 3 in MPEC 2020-Y51 -- 2020 VQ6, 2012 UK171, 2001 YV3
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 33 in MPECs 2020-Y50, 2020-Y51, 2020-Y52, 2020-Y53, 2020-Y54 & 2020-Y55 -- 2020 YZ, 2020 YC1, 2020 YB1, 2020 YA1, 2020 XV, 2020 XP2, 2020 XK1, 2020 XD2, 2020 WN4, 2020 WM3, 2020 WG, 2020 SE4, 2020 PK7, 2020 OK5, 2019 BO1, 2015 XW128, 2014 VU1, 2013 WN67, 2013 UX14, 2012 XE17, 2009 ST19, 2002 GZ8, 486001, 428086, 415029, 39572, 351370, 349074, 154330, 152978, 8507, 1863, 1580
`C51`	NEOWISE in Earth polar orbit, 1 in MPEC 2020-Y51 -- 4503
`G34`	Oberfrauendorf Obs. in Germany, 1 in MPEC 2020-Y51 -- 2020 YF
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2020-Y51 & 2020-Y54 -- 2020 YB1, 2014 RY11, 2014 QT362, 2014 QT2, 2014 NE63, 2014 NC39
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2020-Y50 & 2020-Y52 -- 2020 YZ, 2015 XW128
`104`	San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 XY4, 2020 XA3
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2020-Y53 -- 2020 YA1
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y51 -- 25330
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2020-Y49 -- 2020 YW
`0331`	program code 1 via Schwarzschild Obs. in Germany, 36 in MPECs 2020-Y49, 2020-Y50, 2020-Y51, 2020-Y53, 2020-Y54 & 2020-Y55 -- 2020 YZ, 2020 YW, 2020 YN, 2020 YM, 2020 YL, 2020 YG, 2020 YF, 2020 YE, 2020 YC1, 2020 YC, 2020 YB1, 2020 YB, 2020 YA1, 2020 YA, 2020 XZ5, 2020 XZ4, 2020 XY4, 2020 XY, 2020 XX6, 2020 XS5, 2020 XS3, 2020 XQ6, 2020 XP6, 2020 XJ6, 2020 XJ3, 2020 XH6, 2020 XG3, 2020 XF3, 2020 XD6, 2020 XD2, 2020 XA3, 2020 VY5, 2020 VN3, 2020 SO, 2018 XU3, 2018 XE4
`Y28`	Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2020-Y51 -- 2020 XK1
`Q11`	Shinshiro Obs., 1 in MPEC 2020-Y51 -- 162173
`W885`	M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2020-Y51 -- 2020 XH1
`587`	Sormano Obs. in Italy, 2 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 XX3
`691`	Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2020-Y51 -- 2020 XU6, 2020 XM1, 2020 XM, 2020 XF, 2020 WJ4, 2020 WH2, 2020 WF2, 2020 OC8, 2020 OC7, 2016 JU33, 2002 LG3
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2020-Y51 -- 2020 XK5, 2020 XB7, 2007 US12
`W34`	Squirrel Valley Obs. in North Carolina, 5 in MPECs 2020-Y49 & 2020-Y51 -- 2020 YW, 2020 XN1, 2020 VQ6, 2013 YS2, 138947
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 54 in MPECs 2020-Y50, 2020-Y51, 2020-Y53, 2020-Y54 & 2020-Y55 -- 2020 YZ, 2020 YW, 2020 YM, 2020 YJ, 2020 YH, 2020 YG, 2020 YF, 2020 YE, 2020 YD, 2020 YC1, 2020 YC, 2020 YB1, 2020 YB, 2020 YA1, 2020 YA, 2020 XW, 2020 XV6, 2020 XV3, 2020 XU6, 2020 XP, 2020 XN3, 2020 XM3, 2020 XL3, 2020 XK3, 2020 XH6, 2020 XH3, 2020 XG1, 2020 XF, 2020 XD6, 2020 XC7, 2020 XC5, 2020 XC3, 2020 XB6, 2020 XA6, 2020 XA4, 2020 XA3, 2020 WS5, 2020 WS, 2020 WM3, 2020 WG, 2020 WF3, 2020 WC5, 2020 WC3, 2020 VQ3, 2020 UU3, 2020 UR6, 2020 UM8, 2020 TB12, 2020 RQ11, 2020 RO9, 2020 QU6, 2020 QM4, 2018 LM4, 2017 SN14
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y51 -- 2020 XE3
`G33`	Wickede Obs. in Germany, 1 in MPEC 2020-Y51 -- 501647
`N88`	Xingming Obs. #3, 1 in MPEC 2020-Y49 -- 2020 YW
`I41`	Zwicky Transient Facility in southern California, 1 in MPEC 2020-Y51 -- 2020 XY4

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 19 December '20

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL and NEODyS listings is 100 years, and both post impact solutions beyond that for some special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.
0000NNN000 Object	Risk Monitor	When Noted UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Today's Latest Risk Assessments

2020 YA1	JPL Sentry	1731	2047-2116	62	6.99321815e-05	-5.16	-5.71	0	JPL: Computed at 09:17 today Pacific time based on 27 observations spanning 1.9597 days (2020-Dec-17.404234 to 2020-Dec-19.36389). Diameter approximately 0.016 km. from weighted mean H=26.65.

2020 YN	NEODyS	2300	2046-2060	4	3.31e-05	-5.32	-5.34	0	NEODyS: "Based on 26 optical observations (of which 2 are rejected as outliers) from 2020-12-17.253 to 2020-12-19.101."
2020 YN	JPL Sentry	1700	2046-2047	4	8.183332e-05	-4.94	-4.95	0	JPL: Computed at 07:05 today Pacific time based on 24 observations spanning 1.8432 days (2020-Dec-17.25699 to 2020-Dec-19.100215). Diameter approximately 0.010 km. from weighted mean H=27.65.

2020 YL	NEODyS	2300	R E M O V E D						-

2020 YF	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1522 UTC today

2020 XB7	NEODyS	2300	R E M O V E D						-
2020 XB7	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1512 UTC today

2020 XV6	NEODyS	2300	2091-2105	7	9.45e-07	-4.61	-4.97	0	NEODyS: "Based on 79 optical observations (of which 1 are rejected as outliers) from 2020-12-15.121 to 2020-12-19.080."
2020 XV6	JPL Sentry	1700	2099-2102	2	4.428e-07	-4.93	-5.11	0	JPL: Computed at 06:55 today Pacific time based on 79 observations spanning 3.9587 days (2020-Dec-15.120177 to 2020-Dec-19.078916). Diameter approximately 0.095 km. from weighted mean H=22.75.

2020 XU6	NEODyS	2300	2050-2117	13	2.3e-07	-5.20	-5.51	0	NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2020-12-14.363 to 2020-12-19.469."
2020 XU6	JPL Sentry	1700	2034-2118	85	1.5222049e-06	-4.31	-5.10	0	JPL: Computed at 06:54 today Pacific time based on 24 observations spanning 5.1061 days (2020-Dec-14.362132 to 2020-Dec-19.46824). Diameter approximately 0.171 km. from weighted mean H=21.45.

2020 XA6	NEODyS	2300	2062-2073	9	7.91e-07	-5.38	-5.65	0	NEODyS: "Based on 75 optical observations (of which 2 are rejected as outliers) from 2020-12-14.125 to 2020-12-19.093."
2020 XA6	JPL Sentry	1700	2062-2073	4	2.6052e-06	-4.84	-5.19	0	JPL: Computed at 06:57 today Pacific time based on 75 observations spanning 4.9677 days (2020-Dec-14.124162 to 2020-Dec-19.091907). Diameter approximately 0.053 km. from weighted mean H=24.04.

2020 XX3	NEODyS	2300	R E M O V E D						-
2020 XX3	JPL Sentry	1700	2086-2094	2	5.2257e-07	-8.32	-8.36	0	JPL: Computed at 07:21 today Pacific time based on 90 observations spanning 7.5560 days (2020-Dec-10.276407 to 2020-Dec-17.832423). Diameter approximately 0.007 km. from weighted mean H=28.48.

2020 XE3	NEODyS	2300	R E M O V E D						-
2020 XE3	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1429 UTC today

2020 XK1	JPL Sentry	1700	2070-2102	6	4.16376e-06	-8.30	-8.53	0	JPL: Computed at 06:37 today Pacific time based on 25 observations spanning 2.1405 days (2020-Dec-06.145447 to 2020-Dec-08.285964). Diameter approximately 0.003 km. from weighted mean H=30.58.

2020 XF	NEODyS	2300	2056-2120	527	1.26e-03	-3.89	-4.08	n/a	NEODyS: "Based on 78 optical observations (of which 1 are rejected as outliers) from 2020-12-04.328 to 2020-12-19.157."
2020 XF	JPL Sentry	1700	2056-2120	130	0.000373208785	-4.51	-5.01	0	JPL: Computed at 06:55 today Pacific time based on 78 observations spanning 14.829 days (2020-Dec-04.32683 to 2020-Dec-19.15579). Diameter approximately 0.016 km. from weighted mean H=26.67.

2020 VW	NEODyS	2300	2074-2093	31	7.08e-03	-3.87	-4.14	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2020-11-03.305 to 2020-11-18.204."
2020 VW	JPL Sentry	1700	2074-2087	15	0.007340644954	-3.83	-4.13	0	JPL: Computed at 06:42 today Pacific time based on 20 observations spanning 14.900 days (2020-Nov-03.303834 to 2020-Nov-18.203395). Diameter approximately 0.007 km. from weighted mean H=28.32.

2017 YV8	JPL Sentry	1700	2078-2117	26	2.2981859e-05	-6.11	-6.30	0	JPL: Computed at 08:26 March 3rd of 2018 Pacific time based on 19 observations spanning 24.804 days (2017-Dec-22.42245 to 2018-Jan-16.226307). Diameter approximately 0.011 km. from weighted mean H=27.37.

2010 MY112	JPL Sentry	1700	2022-2092	28	1.1329e-08	-4.49	-4.84	0	JPL: Computed at 07:47 Oct. 15th of 2018 Pacific time based on 18 observations spanning 1.5218 days (2010-Jun-23.611671 to 2010-Jun-25.133483). Diameter approximately 0.370 km. from weighted mean H=21.00.

2005 TM173	JPL Sentry	1700	2021-2116	146	9.395122e-07	-5.31	-6.23	0	JPL: Computed at 08:06 April 8th of 2017 Pacific time based on 6 observations spanning 1.9467 days (2005-Oct-09.20072 to 2005-Oct-11.14743). Diameter approximately 0.051 km. from weighted mean H=24.12.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology on 19 December '20

Times are UTC for when items were noted or added by The Tracking News.

2358	Grabbed MPEC 2020-Y54 - 2020 YB1 - see above Grabbed MPEC 2020-Y55 - 2020 YC1 - see above
2300	Noted that NEODyS has updated its 2020 VW risk assessment - see above Noted that NEODyS has updated its 2020 XA6 risk assessment - see above Noted that NEODyS has removed 2020 XB7 as an impact risk - see above Noted that NEODyS has removed 2020 XE3 as an impact risk - see above Noted that NEODyS has updated its 2020 XF risk assessment - see above Noted that NEODyS has updated its 2020 XU6 risk assessment - see above Noted that NEODyS has updated its 2020 XV6 risk assessment - see above Noted that NEODyS has removed 2020 XX3 as an impact risk - see above Noted that NEODyS has removed 2020 YL as an impact risk - see above Noted that NEODyS has updated its 2020 YN risk assessment - see above
1731	Noted that JPL Sentry has posted 2020 YA1 as an impact risk - see above
1700	Noted that JPL Sentry has updated its 2005 TM173 risk assessment - see above Noted that JPL Sentry has updated its 2010 MY112 risk assessment - see above Noted that JPL Sentry has updated its 2017 YV8 risk assessment - see above Noted that JPL Sentry has updated its 2020 VW risk assessment - see above Noted that JPL Sentry has updated its 2020 XA6 risk assessment - see above Noted that JPL Sentry has removed 2020 XB7 as an impact risk - see above Noted that JPL Sentry has removed 2020 XE3 as an impact risk - see above Noted that JPL Sentry has updated its 2020 XF risk assessment - see above Noted that JPL Sentry has reposted 2020 XK1 as an impact risk - see above Noted that JPL Sentry has updated its 2020 XU6 risk assessment - see above Noted that JPL Sentry has updated its 2020 XV6 risk assessment - see above Noted that JPL Sentry has updated its 2020 XX3 risk assessment - see above Noted that JPL Sentry has removed 2020 YF as an impact risk - see above Noted that JPL Sentry has updated its 2020 YN risk assessment - see above Grabbed MPEC 2020-Y50 - 2020 YZ - see above Grabbed MPEC 2020-Y51 - Daily Orbit Update - see above Grabbed MPEC 2020-Y52 - 2015 XW128 - see above Grabbed MPEC 2020-Y53 - 2020 YA1 - see above
0530	Grabbed MPEC 2020-Y49 - 2020 YW - see above

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