2020-12-20 Tracking News

Contents on 20 December '20

IAU Minor Planet Center
- NEOCP Activity -- 55 listings
- New MPECs -- seven MPECs
Observers -- 27 observers
Impact Risk Monitoring -- seventeen 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 1243 risk-listed objects, 166 have had news in the last 31 days. Updated at 2000 UTC on 20 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 20 December '20

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 62 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 20 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-Y56 time-stamped "12:30 UT" - Daily Orbit Update - see below
MPEC 2020-Y57 time-stamped "14:58 UT" - 2020 YD1 - see below
MPEC 2020-Y58 time-stamped "15:00 UT" - 2020 YE1 - see below
MPEC 2020-Y59 time-stamped "15:02 UT" - 2020 YF1 - see below
MPEC 2020-Y60 time-stamped "15:23 UT" - 2020 YG1 - see below
MPEC 2020-Y61 time-stamped "15:24 UT" - 2020 YH1 - see below
MPEC 2020-Y62 time-stamped "15:32 UT" - 2020 VE7

MPEC 2020-Y62 - "15:32 UT" - 2020 VE7

K20V07E 2020 VE7 (small asteroid, H=25.4 ~28m) was picked up at 0629 UT on 5 Nov. by Pan-STARRS 1 (PS1), observing it at Nov. 5.27-29p3 at w=22.20-26. This detection was confirmed by the Mt. Lemmon Survey (MLS) (Dec. 19.46-47p4, 19.54p3 & 20.48p3).

MPEC 2020-Y61 - "15:24 UT" - 2020 YH1

K20Y01H 2020 YH1 (small asteroid, H=27.12 ~13m) was picked up at 0726 UT on 19 Dec. by MLS, observing it at Dec. 19.31-33p4. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Dec. 19.51p3 & 20.28-29p4), program code 1 via KLENOT (Dec. 19.92p4), Great Shefford Obs. (Dec. 19.99-00p2), and program code 1 via Schwarzschild Obs. (Dec. 20.10p3 at V=21.9-22.4).

MPEC 2020-Y60 - "15:23 UT" - 2020 YG1

K20Y01G 2020 YG1 (small asteroid, H=27.11 ~13m) was picked up at 0540 UT on 19 Dec. by MLS, observing it at Dec. 19.24-26p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.38-39p4 & 20.12-13p4), Schwarzschild Obs./code 1 (Dec. 19.71-72p4), KLENOT/code 1 (Dec. 19.88p3), and Great Shefford Obs. (Dec. 19.89-93p4).

MPEC 2020-Y59 - "15:02 UT" - 2020 YF1

K20Y01F 2020 YF1 (H=19.48 ~430m) was picked up at 0735 UT on 17 Dec. by MLS, observing it at Dec. 17.32-33p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 17.42p3), Schwarzschild Obs./code 1 (Dec. 17.90-91p4 at V=21.7-22.0, 18.84-85p3 at V=22.0-22.7, 19.10-11p3 at V=21.9-22.1 & 20.13-14p4 at V=22.6-23.4), Astronomical Research Obs. Westfield (Dec. 18.16-17p2), and the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 19.22p3 & 20.18-19p3).

MPEC 2020-Y58 - "15:00 UT" - 2020 YE1

K20Y01E 2020 YE1 (risk listed, Q=4.244 AU, H=22.3 ~117m) was picked up at 1150 UT on 18 Dec. by MLS, observing it at Dec. 18.49-51p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 18.54-55p3), Schwarzschild Obs./code 1 (Dec. 19.04p3 at V=22.9-23.3, 19.19-20p4 at V=22.3-7 & 20.19p5 at V=21.8-22.6), and CSS-Kuiper (Dec. 20.43-44p4).

MPEC 2020-Y57 - "14:58 UT" - 2020 YD1

K20Y01D 2020 YD1 (small asteroid, H=24.4 ~45m) was picked up at 1121 UT on 18 Dec. by MLS, observing it at Dec. 18.47-49p4. This detection was confirmed by CSS-Kuiper (Dec. 18.53p3 & 20.35-36p4), Schwarzschild Obs./code 1 (Dec. 19.07-08p4 at V=22.0-22.2, 19.15-16p4 at V=21.6-8 & 20.15p4 at V=21.7-22.8), and Sandlot Obs. (Dec. 19.41-44p3).

<< DOU on 20 December '20 >> MPEC 2020-Y56 - "12:30 UT" - Daily Orbit Update

Observations of risk-listed objects
K20Y00N 2020 YN (small asteroid, arc=3 days, H=27.6 ~10m, close passer) from CSS-Kuiper (Dec. 20.10-11p3 at G=21.94-22.59)
K20X06V 2020 XV6 (small asteroid, q=0.185 AU, arc=5 days, H=22.7 ~98m) from KLENOT/code 1 (Dec. 19.87p5) and Steward Mt. Lemmon Sta. (Dec. 20.09p4)
K20X06U 2020 XU6 (arc=6 days, H=21.4 ~178m) from Steward Mt. Lemmon Sta. (Dec. 20.21-23p4)
K20X06A 2020 XA6 (small asteroid, arc=6 days, H=24.0 ~54m) from Steward Mt. Lemmon Sta. (Dec. 20.09-10p4)
K20X04U 2020 XU4 (small asteroid, arc=4 days, H=27.8 ~9m, close passer, NHATS target) from UH/Tholen NEO Follow-Up 2.24m Telescope (Dec. 16.53p1 at G=22.47)
K20X00F 2020 XF (small asteroid, arc=16 days, H=26.7 ~15m, close passer, NHATS target) from CSS-Kuiper (Dec. 20.08p4)
Observations of recently (no longer) risk-listed objects
K20Y00L 2020 YL (small asteroid, arc=3 days, H=26.9 ~14m) from Schwarzschild Obs./code 1 (Dec. 19.75p3)
K20Y00F 2020 YF (small asteroid, Q=0.988 AU, arc=3 days, H=28.8 ~6m, close passer, NHATS target) from Schwarzschild Obs./code 1 (Dec. 19.71p3), Great Shefford Obs. (Dec. 19.80-81p5), and Steward Mt. Lemmon Sta. (Dec. 20.07p4)
K20X06E 2020 XE6 (arc=8 days, H=19.9 ~355m) from CSS-Kuiper (Dec. 20.27-28p4 at G=21.49-22.21)
K20X05D 2020 XD5 (arc=9 days, H=20.0 ~339m) from Steward Mt. Lemmon Sta. (Dec. 20.45p4)
K20X02Z 2020 XZ2 (small asteroid, arc=13 days, H=22.3 ~117m) from CSS-Kuiper (Dec. 20.22p4 at G=22.50)
K20X01G 2020 XG1 (almost small, i=50.3°, arc=15 days, H=21.8 ~148m) from MLS (Dec. 19.21-22p3) and Steward Mt. Lemmon Sta. (Dec. 20.24-25p4)
Observations of close-passing objects
K20Y00U 2020 YU (arc=3 days, H=25.5 ~27m) from Great Shefford Obs. (Dec. 19.98-99p4) and Northolt Branch Obs. (Dec. 19.99p2)
K20Y00G 2020 YG (arc=4 days, H=28.6 ~6m) from Galhassin Robotic Telescope (Dec. 19.75-80p3), Schwarzschild Obs./code 1 (Dec. 19.76p3 at V=20.8-22.2 & 20.01p3 at V=18.5-9), and Great Shefford Obs. (Dec. 19.81-82p4)
K20Y00B 2020 YB (arc=4 days, H=29.0 ~5m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 19.69p2) and Steward Mt. Lemmon Sta. (Dec. 20.08p4)
K20X06H 2020 XH6 (arc=6 days, H=26.9 ~14m) from Schwarzschild Obs./code 1 (Dec. 19.72p4) and Steward Mt. Lemmon Sta. (Dec. 20.20-21p3)
K20X04Z 2020 XZ4 (arc=8 days, H=24.8 ~37m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 19.72p3)
K20X04Y 2020 XY4 (arc=8 days, H=27.0 ~13m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 19.80p3), Drebach Obs. (Dec. 19.86p4), and Great Shefford Obs. (Dec. 19.95-96p4)
K20X04V 2020 XV4 (arc=8 days, H=25.4 ~28m) from Steward Mt. Lemmon Sta. (Dec. 20.23p4)
K20X03J 2020 XJ3 (arc=10 days, H=25.7 ~25m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 19.71p3 & 19.81p3)
K20X00H 2020 XH (arc=15 days, H=24.6 ~41m) from MLS (Dec. 19.37-39p4)
K20O05K 2020 OK5 (arc=160 days, H=25.2 ~31m, NHATS target) from Dettelbach Vineyard Obs. (Dec. 19.12-14p3) and the Catalina Sky Survey (CSS) (Dec. 20.27-28p3)
K18X04E 2018 XE4 (arc=2 opp, H=26.5 ~17m) from Schwarzschild Obs./code 1 (Dec. 19.76p3)
K12UH1K 2012 UK171 (arc=3 opp, H=24.4 ~45m, NHATS target) from Drebach Obs. (Dec. 19.87p4)
o1647 501647 2014 SD224 from M. Kumrucu-Lohmiller via Slooh.com Canary Islands Obs. (Dec. 19.08-13p5), ATLAS Mauna Loa (Dec. 19.58-61p4), and Drebach Obs. (Dec. 19.71p4)
Observation campaigns (NHATS targets, radar support)
K20Y00C 2020 YC (arc=4 days, H=26.0 ~21m, NHATS) from Schwarzschild Obs./code 1 (Dec. 19.82p2) and Steward Mt. Lemmon Sta. (Dec. 20.15p4)
K20X06L 2020 XL6 (arc=14 days, H=25.2 ~31m, NHATS) from CSS-Kuiper (Dec. 20.28-29p3)
K20X02W 2020 XW2 (arc=13 days, H=25.0 ~34m, NHATS) from CSS-Kuiper (Dec. 20.08-09p3)
K20X02O 2020 XO2 (arc=12 days, H=24.8 ~37m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 20.18p4)
K20X00W 2020 XW (arc=14 days, H=24.7 ~39m, NHATS) from MLS (Dec. 19.21-23p4)
K20W03Q 2020 WQ3 (arc=41 days, H=25.7 ~25m, NHATS) from MLS (Dec. 19.41-43p4)
K20V05X 2020 VX5 (arc=37 days, H=23.4 ~71m, NHATS) from the Spacewatch 0.9m telescope (Dec. 20.26-33p3)
K20S00O 2020 SO (Q=0.988 AU, arc=32 days, H=28.5 ~7m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 19.09-10p4)
K20F01T 2020 FT1 (arc=2 opp, H=22.4 ~112m, NHATS) from MLS (Dec. 19.35-37p4)
K12U09S 2012 US9 (arc=3 opp, H=21.8 ~148m, NHATS) from Spacewatch 0.9m (Dec. 20.07-12p3)
K07U01Y 2007 UY1 (arc=3 opp, H=23.1 ~81m, NHATS) from Spacewatch 0.9m (Dec. 20.15-22p3 at R=22.0-22.1)
-- NHATS target table
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y00W 2020 YW (q=0.364 AU, arc=3 days, H=23.0 ~85m) from Steward Mt. Lemmon Sta. (Dec. 20.20p4)
K20Y00V 2020 YV (arc=3 days, H=25.2 ~31m) from Steward Mt. Lemmon Sta. (Dec. 20.14-15p4)
K20Y00T 2020 YT (arc=3 days, H=25.5 ~27m) from CSS-Kuiper (Dec. 20.13-15p3)
K20Y00P 2020 YP (arc=4 days, H=24.5 ~43m) from Steward Mt. Lemmon Sta. (Dec. 20.47p4)
K20Y00M 2020 YM (arc=3 days, H=26.8 ~15m) from Steward Mt. Lemmon Sta. (Dec. 20.35-39p4)
K20Y00J 2020 YJ (arc=4 days, H=23.3 ~74m) from Steward Mt. Lemmon Sta. (Dec. 20.30p4)
K20Y00E 2020 YE (Q=4.343 AU, arc=14 days, H=24.2 ~49m) from CSS (Dec. 19.25-27p2) and Steward Mt. Lemmon Sta. (Dec. 20.23p4)
K20Y00D 2020 YD (arc=4 days, H=25.0 ~34m) from Steward Mt. Lemmon Sta. (Dec. 20.25-26p4)
K20Y00A 2020 YA (arc=15 days, H=25.7 ~25m) from Schwarzschild Obs./code 1 (Dec. 20.17p4)
K20X06Z 2020 XZ6 (arc=5 days, H=24.1 ~51m) from Steward Mt. Lemmon Sta. (Dec. 20.39-40p4)
K20X06Q 2020 XQ6 (q=0.325 AU, arc=6 days, H=23.2 ~78m) from Schwarzschild Obs./code 1 (Dec. 19.83-84p4) and Steward Mt. Lemmon Sta. (Dec. 20.31-35p4)
K20X06O 2020 XO6 (arc=13 days, H=25.5 ~27m) from CSS-Kuiper (Dec. 20.15-16p4 at G=21.14-22.01)
K20X06K 2020 XK6 (arc=6 days, H=25.2 ~31m) from CSS-Kuiper (Dec. 20.22-23p4 at G=21.05-22.09)
K20X06D 2020 XD6 (arc=6 days, H=25.2 ~31m) from Steward Mt. Lemmon Sta. (Dec. 20.16-17p4)
K20X06C 2020 XC6 (arc=6 days, H=24.6 ~41m) from CSS-Kuiper (Dec. 20.11-13p3)
K20X06B 2020 XB6 (i=55.4°, arc=6 days, H=22.6 ~102m) from Steward Mt. Lemmon Sta. (Dec. 20.11p3)
K20X05Y 2020 XY5 (arc=28 days, H=23.1 ~81m) from CSS-Kuiper (Dec. 20.45p2)
K20X05W 2020 XW5 (arc=13 days, H=25.0 ~34m) from Steward Mt. Lemmon Sta. (Dec. 20.29-30p4)
K20X05A 2020 XA5 (arc=11 days, H=24.3 ~47m) from CSS-Kuiper (Dec. 20.36-37p3)
K20X04H 2020 XH4 (arc=10 days, H=23.2 ~78m) from Steward Mt. Lemmon Sta. (Dec. 20.30p4)
K20X04G 2020 XG4 (arc=14 days, H=23.0 ~85m) from Steward Mt. Lemmon Sta. (Dec. 20.24p4)
K20X03U 2020 XU3 (arc=12 days, H=22.3 ~117m) from CSS-Kuiper (Dec. 20.24-26p4)
K20X03F 2020 XF3 (arc=11 days, H=25.6 ~26m) from Steward Mt. Lemmon Sta. (Dec. 20.46p4)
K20X03D 2020 XD3 (arc=11 days, H=25.7 ~25m) from Steward Mt. Lemmon Sta. (Dec. 20.27-28p4)
K20X03C 2020 XC3 (arc=11 days, H=22.4 ~112m) from Steward Mt. Lemmon Sta. (Dec. 20.21p4)
K20X03A 2020 XA3 (arc=12 days, H=24.5 ~43m) from Schwarzschild Obs./code 1 (Dec. 19.69p3) and Steward Mt. Lemmon Sta. (Dec. 20.08-09p4)
K20X02N 2020 XN2 (arc=12 days, H=23.4 ~71m) from Steward Mt. Lemmon Sta. (Dec. 20.16-17p4)
K20X02J 2020 XJ2 (arc=13 days, H=24.2 ~49m) from Steward Mt. Lemmon Sta. (Dec. 20.15-16p4)
K20X00Y 2020 XY (arc=15 days, H=25.6 ~26m) from Schwarzschild Obs./code 1 (Dec. 19.80p2) and Steward Mt. Lemmon Sta. (Dec. 20.46p4)
K20X00K 2020 XK (arc=15 days, H=24.8 ~37m) from MLS (Dec. 19.31-33p4) and Steward Mt. Lemmon Sta. (Dec. 19.53p3)
K20W00K 2020 WK (arc=38 days, H=25.6 ~26m) from the Spacewatch 1.8m telescope (Dec. 19.50-53p2 at R=22.6)
K20V07C 2020 VC7 (arc=45 days, H=24.2 ~49m) from ATLAS Mauna Loa (Dec. 19.60-63p4) and Drebach Obs. (Dec. 19.89-90p4)
K20R11Q 2020 RQ11 (arc=97 days, H=22.3 ~117m) from MLS (Dec. 19.13-14p4)
K12XD3E 2012 XE133 (arc=2 opp, H=23.3 ~74m) from Dettelbach Vineyard Obs. (Dec. 19.14-15p3) and ATLAS Mauna Loa (Dec. 19.62-65p3)
K20Y00K 2020 YK (i=37.8°, arc=4 days, H=21.8 ~148m) from CSS-Kuiper (Dec. 20.33-34p3)
K20Y00H 2020 YH (arc=4 days, H=22.0 ~135m) from Schwarzschild Obs./code 1 (Dec. 19.77p2 at V=22.3-5) and Steward Mt. Lemmon Sta. (Dec. 20.18-19p4)
K20X02P 2020 XP2 (arc=12 days, H=22.0 ~135m) from Steward Mt. Lemmon Sta. (Dec. 19.55p4)
K16Y00M 2016 YM (arc=3 opp, H=22.0 ~135m) from Dettelbach Vineyard Obs. (Dec. 19.10-11p3) and AHS Obs. (Dec. 19.31-33p3)
K16T54R 2016 TR54 (arc=5 opp, H=22.0 ~135m) from CSS (Dec. 19.17-19p4)
K14U57E 2014 UE57 (Q=4.465 AU, arc=63 days, H=22.0 ~135m) from PS1 (2014 Sept. 17.51-53p3)
K14U33A 2014 UA33 (arc=79 days, H=21.8 ~148m) from PS1 (2014 Oct. 13.49-51p3)
Observations of other objects
K20X07C 2020 XC7 (arc=5 days, H=20.6 ~257m) from Steward Mt. Lemmon Sta. (Dec. 20.11-12p4)
K20X05C 2020 XC5 (Q=4.128 AU, arc=8 days, H=20.9 ~224m) from Steward Mt. Lemmon Sta. (Dec. 20.27p4)
K20X04T 2020 XT4 (arc=12 days, H=21.1 ~204m) from Steward Mt. Lemmon Sta. (Dec. 19.54p4 & 20.46-47p4)
K20X03L 2020 XL3 (arc=10 days, H=21.2 ~195m) from Drebach Obs. (Dec. 19.88-89p4)
K20X01N 2020 XN1 (i=36.8°, Q=4.006 AU, arc=31 days, H=19.6 ~407m) from Steward Mt. Lemmon Sta. (Dec. 19.49p4) and Drebach Obs. (Dec. 19.85p5)
K20X00Q 2020 XQ (arc=37 days, H=21.4 ~178m) from CSS-Kuiper (Dec. 20.40-41p4)
K20W05M 2020 WM5 (Q=4.827 AU, arc=22 days, H=20.6 ~257m) from Steward Mt. Lemmon Sta. (Dec. 20.45p4)
K20W05A 2020 WA5 (arc=24 days, H=21.5 ~170m) from ATLAS Mauna Loa (Dec. 19.62-65p7)
K20W04X 2020 WX4 (Q=5.570 AU, arc=26 days, H=21.7 ~155m) from MLS (Dec. 19.29-31p4)
K20W03N 2020 WN3 (arc=29 days, H=19.5 ~426m) from MLS (Dec. 19.27-28p3)
K20W02H 2020 WH2 (Q=4.568 AU, arc=31 days, H=20.0 ~339m) from Steward Mt. Lemmon Sta. (Dec. 19.55p4)
K20U02G 2020 UG2 (arc=64 days, H=21.5 ~170m) from CSS-Kuiper (Dec. 20.17-21p4 at G=21.42-22.06)
K20T07A 2020 TA7 (i=41.9°, arc=30 days, H=21.6 ~162m) from Dettelbach Vineyard Obs. (Oct. 19.77-78p3)
K20T04G 2020 TG4 (Q=4.171 AU, arc=91 days, H=20.0 ~339m) from Wickede Obs. (Dec. 18.81-82p3) and Tentlingen Obs. (Dec. 19.07-09p3)
K20Q06Q 2020 QQ6 (Q=4.107 AU, arc=129 days, H=19.8 ~371m) from Spacewatch 0.9m (Dec. 20.17-24p3)
K20P05C 2020 PC5 (Q=4.177 AU, arc=127 days, H=18.5 ~676m) from CSS (Dec. 19.15-17p4)
K20O08J 2020 OJ8 (i=37.1°, arc=142 days, H=18.7 ~616m) from MLS (Dec. 19.50-51p4 at G=20.86-22.28)
K20O08C 2020 OC8 (arc=187 days, H=20.7 ~245m) from CSS (Dec. 19.22-23p4)
K20O07S 2020 OS7 (Q=4.461 AU, arc=156 days, H=20.2 ~309m) from Spacewatch 0.9m (Dec. 20.16-19p2 & 20.23p1)
K19B01O 2019 BO1 (arc=3 opp, H=19.6 ~407m) from MLS (Dec. 19.37-39p4)
K18G04X 2018 GX4 (arc=3 opp, H=19.2 ~490m) from MLS (Dec. 19.29-31p3)
K17S19E 2017 SE19 (arc=3 opp, H=19.8 ~371m) from Mirasteilas Obs. (Dec. 19.82-84p8)
K16W10G 2016 WG10 (Q=4.152 AU, arc=3 opp, H=20.8 ~234m) from ATLAS Mauna Loa (Dec. 19.58-64p4)
K16O05P 2016 OP5 (arc=4 opp, H=20.9 ~224m) from Dettelbach Vineyard Obs. (Dec. 18.76p3)
K16E85U 2016 EU85 (arc=3 opp, H=19.4 ~446m) from Spacewatch 1.8m (Dec. 19.40-46p3)
K15C01A 2015 CA1 (Q=4.637 AU, arc=107 days, H=20.6 ~257m) from PS1 (2015 Jan. 12.56-60p4 & 2015 Jan. 30.53-57p4)
K14Y15P 2014 YP15 (arc=3 opp, H=19.9 ~355m) from MLS (Dec. 19.33-35p4)
K14X08F 2014 XF8 (arc=45 days, H=20.1 ~323m) from PS1 (2014 Nov. 30.36-40p3)
K14Wa5G 2014 WG365 (arc=5 opp, H=20.0 ~339m) from ATLAS Mauna Loa (Dec. 19.54-55p4)
K14V02H 2014 VH2 (arc=134 days, H=21.5 ~170m) from PS1 (2014 Oct. 5.57-58p2)
K14UB6Z 2014 UZ116 (arc=2 opp, H=20.8 ~234m) from PS1 (2014 June 10.53-54p2, 2014 June 20.57-59p3 & 2014 Nov. 28.26-30p4)
K14J57H 2014 JH57 (Q=6.247 AU, arc=5 opp, H=16.4 ~1.78 km) from the Zwicky Transient Facility (ZTF) (Dec. 19.56-57p4)
K13U14X 2013 UX14 (arc=4 opp, H=18.3 ~741m) from Dettelbach Vineyard Obs. (Dec. 18.92-93p3) and ATLAS Mauna Loa (Dec. 19.57-59p4)
K11Q09G 2011 QG9 (Q=4.358 AU, arc=3 opp, H=20.4 ~282m) from MLS (Dec. 19.31-32p4)
K07S01R 2007 SR1 (arc=4 opp, H=20.2 ~309m) from Spacewatch 0.9m (Dec. 20.08-13p3)
K03Y01M 2003 YM1 (arc=3 opp, H=18.2 ~776m) from Dettelbach Vineyard Obs. (Dec. 19.15-17p3)
K03Y00J 2003 YJ (arc=4 opp, H=20.3 ~295m) from Dettelbach Vineyard Obs. (Dec. 18.82p3) and Mirasteilas Obs. (Dec. 19.85-87p8)
r0938 530938 2011 XE from CSS (Dec. 19.15-17p3)
q3633 523633 2009 XR2 from CSS (Dec. 19.38-40p4)
o7355 507355 2011 VV5 from MLS (Dec. 19.23-25p4)
o5093 505093 2011 VQ5 from ATLAS Mauna Loa (Dec. 19.64-66p4)
m2228 482228 2011 BH10 from MLS (Dec. 19.06-07p4)
i9107 449107 2012 VJ82 from CSS (Dec. 19.43-45p4)
g0048 420048 2011 DL19 from MLS (Dec. 19.22-23p3)
f5029 415029 2011 UL21 from Wickede Obs. (Dec. 18.75-76p6) and MASTER OAFA Obs. (Dec. 19.27-28p2)
Z4663 354663 2005 LY19 from CSS (Dec. 19.49-51p4)
Z1370 351370 2005 EY from MLS (Dec. 19.31-33p4)
V5098 315098 2007 EX from CSS (Dec. 19.54-55p3)
R5792 275792 2001 QH142 from MLS (Dec. 19.10-12p3)
R5714 275714 2000 YH4 from Wickede Obs. (Dec. 18.79-80p6) and Drebach Obs. (Dec. 19.70-71p5)
P2091 252091 2000 UP30 from ZTF (Dec. 20.08-09p4)
L6707 216707 2004 XP164 from CSS (Dec. 19.36-38p3)
I6822 186822 2004 FE31 from CSS (Dec. 19.19-21p4)
G3902 163902 2003 SW222 from Wickede Obs. (Dec. 18.72-73p5) and MLS (Dec. 19.26-29p4)
G3683 163683 2002 YP2 from MLS (Dec. 19.41-43p4)
G2173 162173 Ryugu (1999 JU3) from CSS (Dec. 19.06-08p4)
F3201 153201 2000 WO107 from Althuraya Astronomy Ctr. (Dec. 17.67-69p4) and Tentlingen Obs. (Dec. 18.95-99p4)
F3195 153195 2000 WB1 from MLS (Dec. 19.52-54p4)
E3678 143678 2003 SA224 from CSS (Dec. 19.52-53p4)
D8947 138947 2001 BA40 from Tentlingen Obs. (Dec. 19.10-14p4)
D8175 138175 2000 EE104 from MLS (Dec. 19.35-37p4) and ATLAS Mauna Loa (Dec. 19.64-66p4)
99907 99907 1989 VA from CSS (Dec. 19.06-08p4)
88188 88188 2000 XH44 from MLS (Dec. 19.31-33p4)
87684 87684 2000 SY2 from CSS (Dec. 19.09-10p4)
85709 85709 1998 SG36 from CSS (Dec. 19.54-55p2)
85275 85275 1994 LY from CSS (Dec. 19.19-21p4)
68359 68359 2001 OZ13 from CSS (Dec. 19.15-17p4)
68267 68267 2001 EA16 from MLS (Dec. 19.50-52p4)
65717 65717 1993 BX3 from CSS (Dec. 19.19-21p4)
52689 52689 1998 FF2 from MLS (Dec. 19.26-28p4)
35107 35107 1991 VH from CSS (Dec. 19.06p1)
31669 31669 1999 JT6 from ZTF (Dec. 18.55-57p3 & 19.55-57p5)
25916 25916 2001 CP44 from SATINO-1 (2019 Oct. 4.09-10p4)
21374 21374 1997 WS22 from ATLAS Mauna Loa (Dec. 19.63-65p4)
07753 7753 1988 XB from MASTER OAFA Obs. (Dec. 19.21-24p4)
07350 7350 1993 VA from ZTF (Dec. 18.55-56p2 & 19.55-56p3)
06569 6569 Ondaatje (1993 MO) from CSS (Dec. 19.09p2)
06053 6053 1993 BW3 from Drebach Obs. (Dec. 19.69-70p3)
05879 5879 Almeria (1992 CH1) from CSS (Dec. 19.42-43p2)
05836 5836 1993 MF from Tentlingen Obs. (Dec. 19.00-03p3)
05587 5587 1990 SB from CSS (Dec. 19.21-23p4)
04953 4953 1990 MU from CSS (Dec. 19.06-08p4)
04947 4947 Ninkasi (1988 TJ1) from CSS (Dec. 19.08-10p4)
04055 4055 Magellan (1985 DO2) from CSS (Dec. 19.19-21p4)
03199 3199 Nefertiti (1982 RA) from CSS (Dec. 19.49-51p4)
03122 3122 Florence (1981 ET3) from CSS (Dec. 19.45-47p4)
01980 1980 Tezcatlipoca (1950 LA) from CSS (Dec. 19.54-55p4)
01943 1943 Anteros (1973 EC) from CSS (Dec. 19.48-49p3)
01685 1685 Toro (1948 OA) from CSS (Dec. 19.50-51p4)
00887 887 Alinda (1918 DB) from CSS (Dec. 19.08-10p4)
00433 433 Eros (1898 DQ) from CSS (Dec. 19.54-55p4)

Observers on 20 December '20

A total of 27 observers appear in today's MPECs.

Code	Observer / observatory
`U71`	AHS Obs., 1 in MPEC 2020-Y56 -- 2016 YM
`M46`	Althuraya Astronomy Ctr., 1 in MPEC 2020-Y56 -- 153201
`H21`	Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2020-Y59 -- 2020 YF1
`T08`	ATLAS Mauna Loa in Hawaii, 10 in MPEC 2020-Y56 -- 2020 WA5, 2020 VC7, 2016 WG10, 2014 WG365, 2013 UX14, 2012 XE133, 505093, 501647, 21374, 138175
`703`	Catalina Sky Survey (CSS) in Arizona, 34 in MPEC 2020-Y56 -- 2020 YE, 2020 PC5, 2020 OK5, 2020 OC8, 2016 TR54, 99907, 87684, 85709, 85275, 68359, 65717, 530938, 523633, 449107, 354663, 35107, 315098, 216707, 186822, 162173, 143678, 6569, 5879, 5587, 4953, 4947, 4055, 3199, 3122, 1980, 1943, 1685, 887, 433
`V06`	Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 19 in MPECs 2020-Y56, 2020-Y57, 2020-Y58 & 2020-Y59 -- 2020 YT, 2020 YN, 2020 YK, 2020 YF1, 2020 YE1, 2020 YD1, 2020 XZ2, 2020 XY5, 2020 XW2, 2020 XU3, 2020 XQ, 2020 XO6, 2020 XL6, 2020 XK6, 2020 XF, 2020 XE6, 2020 XC6, 2020 XA5, 2020 UG2
`K87`	Dettelbach Vineyard Obs. in Germany, 8 in MPEC 2020-Y56 -- 2020 TA7, 2020 OK5, 2016 YM, 2016 OP5, 2013 UX14, 2012 XE133, 2003 YM1, 2003 YJ
`113`	Drebach Obs. in Germany, 8 in MPEC 2020-Y56 -- 2020 XY4, 2020 XN1, 2020 XL3, 2020 VC7, 2012 UK171, 501647, 275714, 6053
`L34`	Galhassin Robotic Telescope, 1 in MPEC 2020-Y56 -- 2020 YG
`J95`	Great Shefford Obs. in England, 6 in MPECs 2020-Y56, 2020-Y60 & 2020-Y61 -- 2020 YU, 2020 YH1, 2020 YG1, 2020 YG, 2020 YF, 2020 XY4
`2461`	program code 1 via KLENOT in the Czech Republic, 3 in MPECs 2020-Y56, 2020-Y60 & 2020-Y61 -- 2020 YH1, 2020 YG1, 2020 XV6
`W92`	MASTER OAFA Obs., 2 in MPEC 2020-Y56 -- 415029, 7753
`B67`	Mirasteilas Obs. in Switzerland, 2 in MPEC 2020-Y56 -- 2017 SE19, 2003 YJ
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 32 in MPECs 2020-Y56, 2020-Y57, 2020-Y58, 2020-Y59, 2020-Y60, 2020-Y61 & 2020-Y62 -- 2020 YH1, 2020 YG1, 2020 YF1, 2020 YE1, 2020 YD1, 2020 XW, 2020 XK, 2020 XH, 2020 XG1, 2020 WX4, 2020 WQ3, 2020 WN3, 2020 VE7, 2020 RQ11, 2020 OJ8, 2020 FT1, 2019 BO1, 2018 GX4, 2014 YP15, 2011 QG9, 88188, 68267, 52689, 507355, 482228, 420048, 351370, 275792, 163902, 163683, 153195, 138175
`Z80`	Northolt Branch Obs. in England, 1 in MPEC 2020-Y56 -- 2020 YU
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2020-Y56 & 2020-Y62 -- 2020 VE7, 2015 CA1, 2014 XF8, 2014 VH2, 2014 UZ116, 2014 UE57, 2014 UA33
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2020-Y57 -- 2020 YD1
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y56 -- 25916
`0331`	program code 1 via Schwarzschild Obs. in Germany, 20 in MPECs 2020-Y56, 2020-Y57, 2020-Y58, 2020-Y59, 2020-Y60 & 2020-Y61 -- 2020 YL, 2020 YH1, 2020 YH, 2020 YG1, 2020 YG, 2020 YF1, 2020 YF, 2020 YE1, 2020 YD1, 2020 YC, 2020 YB, 2020 YA, 2020 XZ4, 2020 XY4, 2020 XY, 2020 XQ6, 2020 XJ3, 2020 XH6, 2020 XA3, 2018 XE4
`G40!`	M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-Y56 -- 501647
`691`	Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2020-Y56 -- 2020 VX5, 2020 QQ6, 2020 OS7, 2012 US9, 2007 UY1, 2007 SR1
`291`	Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2020-Y56 -- 2020 WK, 2016 EU85
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 46 in MPECs 2020-Y56, 2020-Y58, 2020-Y59, 2020-Y60 & 2020-Y61 -- 2020 YW, 2020 YV, 2020 YP, 2020 YM, 2020 YJ, 2020 YH1, 2020 YH, 2020 YG1, 2020 YF1, 2020 YF, 2020 YE1, 2020 YE, 2020 YD, 2020 YC, 2020 YB, 2020 XZ6, 2020 XY, 2020 XW5, 2020 XV6, 2020 XV4, 2020 XU6, 2020 XT4, 2020 XQ6, 2020 XP2, 2020 XO2, 2020 XN2, 2020 XN1, 2020 XK, 2020 XJ2, 2020 XH6, 2020 XH4, 2020 XG4, 2020 XG1, 2020 XF3, 2020 XD6, 2020 XD5, 2020 XD3, 2020 XC7, 2020 XC5, 2020 XC3, 2020 XB6, 2020 XA6, 2020 XA3, 2020 WM5, 2020 WH2, 2020 SO
`A16`	Tentlingen Obs. in Switzerland, 4 in MPEC 2020-Y56 -- 2020 TG4, 153201, 138947, 5836
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y56 -- 2020 XU4
`G33`	Wickede Obs. in Germany, 4 in MPEC 2020-Y56 -- 2020 TG4, 415029, 275714, 163902
`I41`	Zwicky Transient Facility (ZTF) in southern California, 4 in MPEC 2020-Y56 -- 2014 JH57, 31669, 252091, 7350

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

Impact Risk Monitoring on 20 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 YE1	NEODyS	2000	2078-2120	3	4.75e-09	-6.85	-6.87	n/a	NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2020-12-18.494 to 2020-12-20.440."

2020 YB1	NEODyS	1700	2073-2120	41	1.29e-05	-5.88	-6.41	n/a	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2020-12-17.531 to 2020-12-19.963."
2020 YB1	JPL Sentry	0600	2064-2120	22	1.37720382e-05	-5.87	-6.48	0	JPL: Computed at 17:06 Dec. 19th Pacific time based on 28 observations spanning 2.4314 days (2020-Dec-17.530488 to 2020-Dec-19.96192). Diameter approximately 0.015 km. from weighted mean H=26.80.

2020 YA1	NEODyS	1700	2047-2113	115	2.04e-05	-5.74	-6.64	0	NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2020-12-17.405 to 2020-12-19.365."

2020 YN	NEODyS	2000	2046-2054	5	3.39e-05	-5.33	-5.35	0	NEODyS: "Based on 29 optical observations (of which 2 are rejected as outliers) from 2020-12-17.253 to 2020-12-20.108."
2020 YN	JPL Sentry	1700	2046-2047	4	8.4081335e-05	-4.95	-4.95	0	JPL: Computed at 06:58 today Pacific time based on 27 observations spanning 2.8507 days (2020-Dec-17.25699 to 2020-Dec-20.107653). Diameter approximately 0.010 km. from weighted mean H=27.68.

2020 XV6	JPL Sentry	1700	2102-2102	2	4.214e-07	-4.95	-5.11	0	JPL: Computed at 06:55 today Pacific time based on 88 observations spanning 4.9704 days (2020-Dec-15.120177 to 2020-Dec-20.090598). Diameter approximately 0.096 km. from weighted mean H=22.74.

2020 XU6	NEODyS	2000	2050-2117	7	2.53e-07	-5.26	-5.35	0	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2020-12-14.363 to 2020-12-20.230."
2020 XU6	JPL Sentry	1700	2034-2117	55	8.680469e-07	-4.55	-5.22	0	JPL: Computed at 06:54 today Pacific time based on 28 observations spanning 5.8671 days (2020-Dec-14.362132 to 2020-Dec-20.229271). Diameter approximately 0.175 km. from weighted mean H=21.43.

2020 XA6	NEODyS	2000	2062-2073	7	8.43e-07	-5.36	-5.61	0	NEODyS: "Based on 79 optical observations (of which 2 are rejected as outliers) from 2020-12-14.125 to 2020-12-20.099."
2020 XA6	JPL Sentry	1700	2062-2073	4	2.5034e-06	-4.87	-5.24	0	JPL: Computed at 06:56 today Pacific time based on 79 observations spanning 5.9744 days (2020-Dec-14.124162 to 2020-Dec-20.098552). Diameter approximately 0.052 km. from weighted mean H=24.05.

2020 XU4	NEODyS	2000	2101-2120	4	2.42e-06	-7.41	-7.41	n/a	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2020-12-12.332 to 2020-12-16.535."
2020 XU4	JPL Sentry	1700	2112-2112	1	1.014e-06	-7.78	-7.78	0	JPL: Computed at 06:35 today Pacific time based on 18 observations spanning 4.2037 days (2020-Dec-12.33093 to 2020-Dec-16.534676). Diameter approximately 0.009 km. from weighted mean H=27.84.

2020 XK1	NEODyS	1700	2070-2117	12	5.55e-06	-8.22	-8.53	0	NEODyS: "Based on 27 optical observations (of which 2 are rejected as outliers) from 2020-12-06.146 to 2020-12-08.287."

2020 XF	NEODyS	2000	2056-2120	553	9.25e-04	-4.07	-4.26	n/a	NEODyS: "Based on 82 optical observations (of which 1 are rejected as outliers) from 2020-12-04.328 to 2020-12-20.082."
2020 XF	JPL Sentry	1700	2056-2120	129	0.000367628323	-4.53	-5.02	0	JPL: Computed at 06:55 today Pacific time based on 82 observations spanning 15.754 days (2020-Dec-04.32683 to 2020-Dec-20.081268). Diameter approximately 0.016 km. from weighted mean H=26.69.

2019 YV1	JPL Sentry	0600	2101-2119	5	5.32e-06	-5.79	-6.20	0	JPL: Computed at 06:39 Aug. 16th Pacific time based on 98 observations spanning 66.141 days (2019-Dec-21.11125 to 2020-Feb-25.252591). Diameter approximately 0.031 km. from weighted mean H=25.20.

2019 YM	JPL Sentry	0600	2041-2117	2	8.740287e-07	-6.63	-6.63	0	JPL: Computed at 07:30 Oct. 8th Pacific time based on 31 observations spanning 2.2239 days (2019-Dec-19.09853 to 2019-Dec-21.322431). Diameter approximately 0.022 km. from weighted mean H=25.97.

2017 YO3	JPL Sentry	0600	2049-2067	26	4.120445e-05	-5.81	-5.88	0	JPL: Computed at 13:22 Dec. 25th of 2017 Pacific time based on 25 observations spanning 2.8852 days (2017-Dec-22.28665 to 2017-Dec-25.17181). Diameter approximately 0.008 km. from weighted mean H=28.20.

2016 AZ193	JPL Sentry	0600	2020-2114	492	2.1894676e-06	-6.20	-7.15	0	JPL: Computed at 14:28 April 6th of 2017 Pacific time based on 9 observations spanning .15930 days (2016-Jan-03.25638 to 2016-Jan-03.41568). Diameter approximately 0.016 km. from weighted mean H=26.62.

2015 XA378	JPL Sentry	0600	2092-2119	22	5.197811e-05	-4.60	-4.83	0	JPL: Computed at 08:15 Sept. 11th Pacific time based on 48 observations spanning 11.782 days (2015-Dec-06.456533 to 2015-Dec-18.23839) including radar (1 Doppler).. Diameter approximately 0.026 km. from weighted mean H=25.55.

2012 XM16	JPL Sentry	0600	2081-2107	4	2.401137e-06	-6.09	-6.17	0	JPL: Computed at 07:59 April 23rd of 2019 Pacific time based on 58 observations spanning 7.1930 days (2012-Dec-06.28107 to 2012-Dec-13.474086). Diameter approximately 0.024 km. from weighted mean H=25.79.

2006 WM3	JPL Sentry	0600	2113-2113	1	5.826e-08	-6.68	-6.68	0	JPL: Computed at 10:08 April 22nd of 2017 Pacific time based on 43 observations spanning 21.898 days (2006-Nov-20.22614 to 2006-Dec-12.124219). Diameter approximately 0.078 km. from weighted mean H=23.20.

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 20 December '20

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

2000	Noted that NEODyS has updated its 2020 XA6 risk assessment - see above Noted that NEODyS has updated its 2020 XF risk assessment - see above Noted that NEODyS has updated its 2020 XU4 risk assessment - see above Noted that NEODyS has updated its 2020 XU6 risk assessment - see above Noted that NEODyS has posted 2020 YE1 as an impact risk - see above Noted that NEODyS has updated its 2020 YN risk assessment - see above
1700	Noted that JPL Sentry has updated its 2020 XA6 risk assessment - see above Noted that JPL Sentry has updated its 2020 XF risk assessment - see above Noted that NEODyS has updated its 2020 XK1 risk assessment - see above Noted that JPL Sentry has updated its 2020 XU4 risk assessment - 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 NEODyS has posted 2020 YA1 as an impact risk - see above Noted that NEODyS has posted 2020 YB1 as an impact risk - see above Noted that JPL Sentry has updated its 2020 YN risk assessment - see above Grabbed MPEC 2020-Y56 - Daily Orbit Update - see above Grabbed MPEC 2020-Y57 - 2020 YD1 - see above Grabbed MPEC 2020-Y58 - 2020 YE1 - see above Grabbed MPEC 2020-Y59 - 2020 YF1 - see above Grabbed MPEC 2020-Y60 - 2020 YG1 - see above Grabbed MPEC 2020-Y61 - 2020 YH1 - see above Grabbed MPEC 2020-Y62 - 2020 VE7 - see above
0600	Noted that JPL Sentry has updated its 2006 WM3 risk assessment - see above Noted that JPL Sentry has updated its 2012 XM16 risk assessment - see above Noted that JPL Sentry has updated its 2015 XA378 risk assessment - see above Noted that JPL Sentry has updated its 2016 AZ193 risk assessment - see above Noted that JPL Sentry has updated its 2017 YO3 risk assessment - see above Noted that JPL Sentry has updated its 2019 YM risk assessment - see above Noted that JPL Sentry has updated its 2019 YV1 risk assessment - see above Noted that JPL Sentry has posted 2020 YB1 as an impact risk - see above

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