2020-12-21 Tracking News

Contents on 21 December '20

IAU Minor Planet Center
- NEOCP Activity -- 45 listings
- New MPECs -- eighteen MPECs
Observers -- 29 observers
Impact Risk Monitoring -- fourteen 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 1245 risk-listed objects, 166 have had news in the last 31 days. Updated at 2201 UTC on 21 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 21 December '20

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 73 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 21 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-Y63 time-stamped "04:36 UT" - 2020 YJ1 - see below
MPEC 2020-Y64 time-stamped "04:37 UT" - 2020 YK1 - see below
MPEC 2020-Y65 time-stamped "12:31 UT" - Daily Orbit Update - see below
MPEC 2020-Y66 time-stamped "13:10 UT" - 2020 YL1 - see below
MPEC 2020-Y67 time-stamped "13:11 UT" - 2020 YM1 - see below
MPEC 2020-Y68 time-stamped "13:12 UT" - 2020 YN1 - see below
MPEC 2020-Y69 time-stamped "13:14 UT" - 2020 YO1 - see below
MPEC 2020-Y70 time-stamped "13:15 UT" - 2020 YP1 - see below
MPEC 2020-Y71 time-stamped "13:16 UT" - 2020 YQ1 - see below
MPEC 2020-Y72 time-stamped "13:18 UT" - 2020 YR1 - see below
MPEC 2020-Y73 time-stamped "13:25 UT" - 2020 YS1 - see below
MPEC 2020-Y74 time-stamped "13:49 UT" - 2020 YU1 - see below
MPEC 2020-Y75 time-stamped "13:51 UT" - 2020 YV1 - see below
MPEC 2020-Y76 time-stamped "17:30 UT" - 2020 XD7 - see below
MPEC 2020-Y77 time-stamped "18:45 UT" - 2020 YZ1 - see below
MPEC 2020-Y78 time-stamped "18:47 UT" - 2020 YA2 - see below
MPEC 2020-Y79 time-stamped "18:51 UT" - 2020 YB2 - see below
MPEC 2020-Y80 time-stamped "23:13 UT" - 2020 YE2

MPEC 2020-Y80 - "23:13 UT" - 2020 YE2

K20Y02E 2020 YE2 (small asteroid, Earth MOID=6.9 LD, H=23.95 ~55m) was picked up at 0725 UT on 19 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 19.31-32p3. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Dec. 19.49-50p4, 20.21-22p3 & 21.21-22p4), program code 1 via Schwarzschild Obs. (Dec. 19.86-87p2 at V=22.0-22.3 & 21.18p3 at V=21.0-3), and program code 1 via KLENOT (Dec. 19.91p2).

MPEC 2020-Y79 - "18:51 UT" - 2020 YB2

K20Y02B 2020 YB2 (Earth MOID=3.1 LD, H=26.57 ~16m) was picked up at 0620 UT on 20 Dec. by MLS, observing it at Dec. 20.26-28p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 20.41p3 at G=20.99-22.26) and the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 21.18-19p3).

MPEC 2020-Y78 - "18:47 UT" - 2020 YA2

K20Y02A 2020 YA2 (risk listed, Earth MOID=1.6 LD, H=28.21 ~8m, close passer) was picked up at 0545 UT on 20 Dec. by MLS, observing it at Dec. 20.24-26p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 20.38p3 & 21.13-14p4) and Astronomical Research Obs. Westfield (Dec. 21.11p3).

MPEC 2020-Y77 - "18:45 UT" - 2020 YZ1

K20Y01Z 2020 YZ1 (small asteroid, H=25.00 ~34m) was picked up at 0729 UT on 19 Dec. by MLS, observing it at Dec. 19.31-33p4 and 21.27p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.48p3).

MPEC 2020-Y76 - "17:30 UT" - 2020 XD7

K20X07D 2020 XD7 (small asteroid, H=25.5 ~27m) was picked up at 1205 UT on 10 Dec. by Pan-STARRS 1 (PS1), observing it at Dec. 10.50-53p3. This detection was confirmed by MLS (Dec. 20.26-28p4) and CSS-Kuiper (Dec. 20.37-38p4 & 21.20-21p3).

MPEC 2020-Y75 - "13:51 UT" - 2020 YV1

K20Y01V 2020 YV1 (small asteroid, H=24.5 ~43m) was picked up at 0826 UT on 19 Dec. by MLS, observing it at Dec. 19.35-37p4. This detection was confirmed by CSS-Kuiper (Dec. 19.49-50p3 & 20.27-28p4), Schwarzschild Obs./code 1 (Dec. 21.17-18p3), and Steward Mt. Lemmon Sta. (Dec. 21.35p3).

MPEC 2020-Y74 - "13:49 UT" - 2020 YU1

K20Y01U 2020 YU1 (small asteroid, Earth MOID=7.2 LD, H=25.7 ~25m) was picked up at 0729 UT on 19 Dec. by MLS, observing it at Dec. 19.31-33p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.50p4), Schwarzschild Obs./code 1 (Dec. 20.10-11p2 at V=22.1-2 & 21.14p2 at V=21.4-7), and CSS-Kuiper (Dec. 21.22p4).

MPEC 2020-Y73 - "13:25 UT" - 2020 YS1

K20Y01S 2020 YS1 (Q=4.276 AU, Earth MOID=2.8 LD, H=26.10 ~20m) was picked up at 0858 UT on 20 Dec. by MLS, observing it at Dec. 20.37-39p3. This detection was confirmed by the Catalina Sky Survey (CSS) (Dec. 16.39-41p3), Steward Mt. Lemmon Sta. (Dec. 20.50-51p3 & 21.32p4), and Schwarzschild Obs./code 1 (Dec. 21.12-13p2).

MPEC 2020-Y72 - "13:18 UT" - 2020 YR1

K20Y01R 2020 YR1 (small asteroid, H=22.9 ~89m) was picked up at 1157 UT on 19 Dec. by MLS, observing it at Dec. 19.50-51p4. This detection was confirmed by CSS-Kuiper (Dec. 19.54p3), Schwarzschild Obs./code 1 (Dec. 20.17-18p3 & 21.15p2), Steward Mt. Lemmon Sta. (Dec. 20.46-47p3 & 21.50p4), and Sandlot Obs. (Dec. 20.47-49p3).

MPEC 2020-Y71 - "13:16 UT" - 2020 YQ1

K20Y01Q 2020 YQ1 (small asteroid, H=23.2 ~78m) was picked up at 0900 UT on 19 Dec. by MLS, observing it at Dec. 19.38-39p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.52-53p4, 20.26-27p4 & 21.35-36p4), Schwarzschild Obs./code 1 (Dec. 19.86p2 at V=22.3-4 & 21.11p3 at V=20.5-7), KLENOT/code 1 (Dec. 19.95p4), and Sandlot Obs. (Dec. 20.33-35p2 & 20.40p1).

MPEC 2020-Y70 - "13:15 UT" - 2020 YP1

K20Y01P 2020 YP1 (borderline-small, i=36.5°, q=0.351 AU, H=21.8 ~148m) was picked up at 0900 UT on 19 Dec. by MLS, observing it at Dec. 19.38-39p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.52p4, 20.25-26p3 & 21.27-28p4), Schwarzschild Obs./code 1 (Dec. 19.84p2 at V=22.2-7 & 21.16p3 at V=21.1-22.1), KLENOT/code 1 (Dec. 19.93-94p5), and Sandlot Obs. (Dec. 21.29-34p3).

MPEC 2020-Y69 - "13:14 UT" - 2020 YO1

K20Y01O 2020 YO1 (small asteroid, H=25.8 ~23m) was picked up at 0726 UT on 19 Dec. by MLS, observing it at Dec. 19.31-33p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.46-47p4, 20.34-35p4 & 21.26-27p4), KLENOT/code 1 (Dec. 19.92p4), and Schwarzschild Obs./code 1 (Dec. 20.07-12p6 & 21.17p3).

MPEC 2020-Y68 - "13:12 UT" - 2020 YN1

K20Y01N 2020 YN1 (Earth MOID=3.6 LD, H=28.6 ~6m) was picked up at 0601 UT on 20 Dec. by MLS, observing it at Dec. 20.25-29p5. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 20.36p4, 20.43p4 & 21.14p4), Clixby Obs. (Dec. 20.95-96p3), Schwarzschild Obs./code 1 (Dec. 21.10p3), and Tebbutt Obs. (Dec. 21.23-25p3).

MPEC 2020-Y67 - "13:11 UT" - 2020 YM1

K20Y01M 2020 YM1 (risk listed, Earth MOID=1.5 LD, H=29.7 ~4m, close passer) was picked up at 1025 UT on 19 Dec. by MLS, observing it at Dec. 19.43-45p4 and 20.48p3. This detection was confirmed by CSS-Kuiper (Dec. 19.51-52p3) and Schwarzschild Obs./code 1 (Dec. 21.20p5).

MPEC 2020-Y66 - "13:10 UT" - 2020 YL1

K20Y01L 2020 YL1 (risk listed, i=48.7°, H=20.6 ~257m) was picked up at 0900 UT on 19 Dec. by MLS, observing it at Dec. 19.38-39p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.52-53p4, 20.26p3 & 21.33p4), Schwarzschild Obs./code 1 (Dec. 19.85p2 & 21.10p3), KLENOT/code 1 (Dec. 19.94p8), and Sandlot Obs. (Dec. 20.28-31p3).

<< DOU on 21 December '20 >> MPEC 2020-Y65 - "12:31 UT" - Daily Orbit Update

Observations of risk-listed objects
K20Y01B 2020 YB1 (small asteroid, arc=4 days, H=26.8 ~15m, close passer) from Schwarzschild Obs./code 1 (Dec. 21.23p5)
K20Y01A 2020 YA1 (small asteroid, arc=4 days, H=26.7 ~15m, close passer, NHATS target) from Schwarzschild Obs./code 1 (Dec. 21.22p3) and Steward Mt. Lemmon Sta. (Dec. 21.39p4)
K20X06V 2020 XV6 (small asteroid, q=0.185 AU, arc=6 days, H=22.7 ~98m) from Steward Mt. Lemmon Sta. (Dec. 21.16-17p2)
K20X06U 2020 XU6 (arc=7 days, H=21.4 ~178m) from Steward Mt. Lemmon Sta. (Dec. 21.29-32p4)
K20X06A 2020 XA6 (small asteroid, arc=7 days, H=24.0 ~54m) from Steward Mt. Lemmon Sta. (Dec. 21.18p4)
K20X03X 2020 XX3 (small asteroid, arc=8 days, H=28.4 ~7m, close passer, NHATS target) from Schiaparelli Obs. (Dec. 17.95-96p9)
K20X00F 2020 XF (small asteroid, arc=17 days, H=26.8 ~15m, close passer, NHATS target) from CSS-Kuiper (Dec. 21.11-12p4)
Observations of recently (no longer) risk-listed objects
K20Y00F 2020 YF (small asteroid, Q=0.988 AU, arc=4 days, H=28.8 ~6m, close passer, NHATS target) from Schiaparelli Obs. (Dec. 17.97-98p5) and Steward Mt. Lemmon Sta. (Dec. 21.17p3)
Observations of close-passing objects
K20Y00U 2020 YU (arc=3 days, H=25.5 ~27m) from the Zwicky Transient Facility (ZTF) (Dec. 19.48p2 & 19.53p2) and Northolt Branch Obs. (Dec. 19.99-01p4)
K20Y00B 2020 YB (arc=5 days, H=28.9 ~6m, NHATS target) from Clixby Obs. (Dec. 20.85-86p3) and Steward Mt. Lemmon Sta. (Dec. 21.08-09p4)
K20X06H 2020 XH6 (arc=7 days, H=26.8 ~15m) from Clixby Obs. (Dec. 20.90p5) and Schwarzschild Obs./code 1 (Dec. 21.23p4)
K20X05G 2020 XG5 (arc=9 days, H=27.1 ~13m, NHATS target) from CSS-Kuiper (Dec. 20.45-49p4 at G=20.95-22.83 & 21.45-46p3 at G=21.82-22.21)
K20X04Z 2020 XZ4 (arc=10 days, H=24.8 ~37m, NHATS target) from CSS (Dec. 20.22-24p4), Schwarzschild Obs./code 1 (Dec. 21.23p3), and Steward Mt. Lemmon Sta. (Dec. 21.41-44p4)
K20X04Y 2020 XY4 (arc=10 days, H=26.9 ~14m, NHATS target) from Northolt Branch Obs. (Dec. 19.89-90p3) and Steward Mt. Lemmon Sta. (Dec. 21.08p4)
K20X04V 2020 XV4 (arc=9 days, H=25.4 ~28m) from MLS (Dec. 20.29-30p4) and the Spacewatch 0.9m telescope (Dec. 21.39-42p3)
K20X03J 2020 XJ3 (arc=12 days, H=25.6 ~26m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 21.15p3)
K20X03B 2020 XB3 (arc=4 days, H=27.5 ~11m) from Schiaparelli Obs. (Dec. 13.18-19p3)
K20X00O 2020 XO (arc=7 days, H=23.9 ~56m) from Schiaparelli Obs. (Dec. 12.92p3)
K20X00N 2020 XN (arc=8 days, H=24.5 ~43m) from Schiaparelli Obs. (Dec. 12.90-91p3)
K20W05Z 2020 WZ5 (arc=22 days, H=26.2 ~19m) from Schiaparelli Obs. (Dec. 13.20-22p3)
K20W04Z 2020 WZ4 (arc=34 days, H=24.3 ~47m) from the Spacewatch 1.8m telescope (Dec. 21.32-37p3 at R=22.0-22.4)
K20M00O 2020 MO (arc=25 days, H=24.7 ~39m) from Schiaparelli Obs. (June 19.91-92p2)
o1647 501647 2014 SD224 from JPL SynTrack Robotic Telescope (Dec. 19.35-36p8 & 19.41-42p8), Northolt Branch Obs. (Dec. 19.93p3), Tacande Obs. (Dec. 19.95-96p3), CSS (Dec. 20.18-20p4), and AHS Obs. (Dec. 21.08-09p3)
Observation campaigns (NHATS targets, radar support)
K20Y00C 2020 YC (arc=5 days, H=25.9 ~22m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 21.21p3)
K20X06W 2020 XW6 (arc=17 days, H=26.3 ~19m, NHATS) from CSS-Kuiper (Dec. 21.16-17p3)
K20W03F 2020 WF3 (arc=30 days, H=23.6 ~65m, NHATS) from MLS (Dec. 20.24-26p4) and Spacewatch 0.9m (Dec. 21.31-36p3)
K20W01D 2020 WD1 (arc=35 days, H=23.6 ~65m, NHATS) from Spacewatch 0.9m (Dec. 21.26-30p3)
K20S00O 2020 SO (Q=0.988 AU, arc=32 days, H=28.5 ~7m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 20.10p4 & 21.17-18p4)
K11G60D 2011 GD60 (arc=3 opp, H=21.8 ~148m, NHATS) from MLS (Dec. 20.26-28p4)
K06R01J 2006 RJ1 (arc=4 opp, H=22.2 ~123m, NHATS) from MLS (Dec. 20.12-14p4)
K03Y17S 2003 YS17 (arc=6 opp, H=21.7 ~155m, NHATS) from MLS (Dec. 20.20-21p4)
f8849 418849 2008 WM64 (radar) from ATLAS Mauna Loa (Dec. 20.29-32p4)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y00W 2020 YW (q=0.364 AU, arc=4 days, H=23.0 ~85m) from Clixby Obs. (Dec. 20.87p3), Steward Mt. Lemmon Sta. (Dec. 21.19p4), and Schwarzschild Obs./code 1 (Dec. 21.23-24p3)
K20Y00V 2020 YV (arc=4 days, H=25.1 ~32m) from Steward Mt. Lemmon Sta. (Dec. 21.22p4)
K20Y00J 2020 YJ (arc=5 days, H=23.3 ~74m) from Steward Mt. Lemmon Sta. (Dec. 21.41p4)
K20Y00E 2020 YE (Q=4.345 AU, arc=15 days, H=24.1 ~51m) from Steward Mt. Lemmon Sta. (Dec. 21.23p4)
K20Y00D 2020 YD (arc=4 days, H=25.0 ~34m) from Schiaparelli Obs. (Dec. 17.82-83p2)
K20X06Q 2020 XQ6 (q=0.325 AU, arc=7 days, H=22.8 ~93m) from JPL SynTrack (Dec. 20.36p2 & 20.42-44p6) and Steward Mt. Lemmon Sta. (Dec. 21.40p4)
K20X06G 2020 XG6 (arc=7 days, H=24.4 ~45m) from CSS-Kuiper (Dec. 21.34-37p4 at G=22.27-23.00)
K20X05Y 2020 XY5 (arc=28 days, H=23.1 ~81m) from MLS (Dec. 20.35-36p4)
K20X03R 2020 XR3 (arc=16 days, H=22.5 ~107m) from CSS-Kuiper (Dec. 21.29-30p4)
K20X03Q 2020 XQ3 (arc=14 days, H=24.9 ~35m) from CSS-Kuiper (Dec. 21.12-13p3)
K20X03F 2020 XF3 (arc=12 days, H=25.6 ~26m) from Steward Mt. Lemmon Sta. (Dec. 21.41p3)
K20X02S 2020 XS2 (Q=4.180 AU, arc=16 days, H=25.0 ~34m) from Steward Mt. Lemmon Sta. (Dec. 21.20p3)
K20X02Q 2020 XQ2 (i=41.9°, arc=9 days, H=22.7 ~98m) from Schiaparelli Obs. (Dec. 13.79-81p3)
K20X02P 2020 XP2 (arc=13 days, H=22.1 ~129m) from CSS (Dec. 20.33-35p4)
K20X02D 2020 XD2 (arc=14 days, H=24.3 ~47m) from CSS-Kuiper (Dec. 21.44-45p4 at G=21.50-22.04)
K20X00J 2020 XJ (arc=17 days, H=25.2 ~31m) from Spacewatch 0.9m (Dec. 21.38-39p2) and CSS-Kuiper (Dec. 21.40p4)
K20V07C 2020 VC7 (arc=45 days, H=24.2 ~49m) from CSS (Dec. 20.20-22p3)
K20V03Q 2020 VQ3 (arc=40 days, H=22.8 ~93m) from MLS (Dec. 20.22-23p4)
K20V01X 2020 VX1 (arc=41 days, H=22.9 ~89m) from MLS (Dec. 20.24-26p3) and Spacewatch 0.9m (Dec. 21.32-37p3 at R=21.5-22.1)
K20U00D 2020 UD (arc=74 days, H=23.3 ~74m) from CSS-Kuiper (Dec. 21.14-16p4 at G=22.02-28)
K12XD3E 2012 XE133 (arc=2 opp, H=23.3 ~74m) from CSS (Dec. 20.25-26p4) and Northolt Branch Obs. (Dec. 20.87-88p2)
K07U12S 2007 US12 (arc=6 opp, H=22.1 ~129m) from Spacewatch 1.8m (Dec. 21.26-29p3 at R=22.4-23.0)
K12L01D 2012 LD1 (arc=3 opp, H=21.8 ~148m) from MLS (Dec. 20.22-23p4)
Observations of other objects
K20Y00K 2020 YK (i=37.4°, arc=5 days, H=21.7 ~155m) from CSS-Kuiper (Dec. 21.30-33p4)
K20X05L 2020 XL5 (arc=24 days, H=20.1 ~323m) from Steward Mt. Lemmon Sta. (Dec. 20.48-53p4 at G=21.01-22.27)
K20X05C 2020 XC5 (Q=4.119 AU, arc=9 days, H=20.9 ~224m) from Steward Mt. Lemmon Sta. (Dec. 21.24-25p4)
K20X03Z 2020 XZ3 (arc=12 days, H=20.7 ~245m) from Steward Mt. Lemmon Sta. (Dec. 21.40-41p4)
K20X03L 2020 XL3 (arc=12 days, H=21.2 ~195m) from Steward Mt. Lemmon Sta. (Dec. 20.48-50p4 & 21.29-31p4)
K20X03K 2020 XK3 (i=57.3°, arc=12 days, H=21.6 ~162m) from Steward Mt. Lemmon Sta. (Dec. 21.23-24p4)
K20X03H 2020 XH3 (arc=12 days, H=20.7 ~245m) from Steward Mt. Lemmon Sta. (Dec. 21.25p4)
K20X02R 2020 XR2 (arc=28 days, H=21.3 ~186m) from CSS-Kuiper (Dec. 21.28-29p4)
K20X00S 2020 XS (i=51.4°, arc=17 days, H=21.1 ~204m) from Spacewatch 1.8m (Dec. 21.19-23p3 at R=21.8-22.1) and CSS-Kuiper (Dec. 21.26-27p4 at G=21.74-22.01)
K20W06A 2020 WA6 (arc=2 opp, H=20.1 ~323m) from MLS (Dec. 20.22-23p4)
K20W05V 2020 WV5 (arc=29 days, H=20.2 ~309m) from Steward Mt. Lemmon Sta. (Dec. 21.39p4)
K20W05M 2020 WM5 (Q=4.826 AU, arc=22 days, H=20.6 ~257m) from CSS (Dec. 20.29-30p4)
K20W05A 2020 WA5 (arc=25 days, H=21.5 ~170m) from Schiaparelli Obs. (Dec. 13.82-84p3) and CSS (Dec. 20.26-28p4)
K20W02H 2020 WH2 (Q=4.567 AU, arc=32 days, H=20.0 ~339m) from MLS (Dec. 20.42-43p4)
K20T04G 2020 TG4 (Q=4.171 AU, arc=91 days, H=20.0 ~339m) from Northolt Branch Obs. (Dec. 19.91-92p3)
K20S18K 2020 SK18 (arc=86 days, H=20.4 ~282m) from CSS-Kuiper (Dec. 21.13-15p4 at G=20.90-22.29)
K20R00U 2020 RU (Q=4.833 AU, arc=112 days, H=19.2 ~490m) from CSS (Dec. 20.22-24p3)
K20O07C 2020 OC7 (arc=178 days, H=20.8 ~234m) from Spacewatch 0.9m (Dec. 21.43-44p3)
K20M03Z 2020 MZ3 (Q=4.359 AU, arc=204 days, H=20.0 ~339m) from MLS (Dec. 20.44-45p4)
K20L03D 2020 LD3 (arc=188 days, H=20.6 ~257m) from MLS (Dec. 20.44-45p4)
K19B01O 2019 BO1 (arc=3 opp, H=19.6 ~407m) from CSS (Dec. 20.28-30p4)
K16J33U 2016 JU33 (arc=2 opp, H=20.9 ~224m) from Spacewatch 0.9m (Dec. 21.16-22p3)
K15O00H 2015 OH (arc=3 opp, H=19.8 ~371m) from MLS (Dec. 20.48-50p4)
K15B04F 2015 BF4 (arc=6 opp, H=20.5 ~269m) from MLS (Dec. 20.22-24p4)
K14L26Q 2014 LQ26 (Q=5.150 AU, arc=2 opp, H=18.4 ~708m) from MLS (Dec. 20.26-28p4)
K14J57H 2014 JH57 (Q=6.247 AU, arc=5 opp, H=16.4 ~1.78 km) from ZTF (Dec. 20.56-57p3)
K13B18D 2013 BD18 (arc=33 days, H=21.2 ~195m) from PS1 (2012 Dec. 22.43-47p4)
K04Q17C 2004 QC17 (arc=6 opp, H=19.0 ~537m) from MLS (Dec. 20.42-43p4)
K04L03U 2004 LU3 (arc=5 opp, H=18.4 ~708m) from MLS (Dec. 20.22-23p4)
K04A00C 2004 AC (arc=4 opp, H=18.9 ~562m) from CSS (Dec. 20.51-52p4)
K03Y00J 2003 YJ (arc=4 opp, H=20.3 ~295m) from BAS Obs. (Dec. 20.87-90p3)
K03M02S 2003 MS2 (arc=2 opp, H=21.3 ~186m) from MLS (Dec. 20.50-52p4)
K02T67S 2002 TS67 (arc=6 opp, H=19.1 ~513m) from Northolt Branch Obs. (Dec. 20.91-93p3)
K02G08Z 2002 GZ8 (Q=4.633 AU, arc=4 opp, H=18.7 ~616m) from Southern Utsunomiya (Dec. 17.61-83p82 & 18.73-75p10), Northolt Branch Obs. (Dec. 19.98p3), and CSS (Dec. 20.38-39p4)
K01Y03V 2001 YV3 (arc=3 opp, H=20.6 ~257m) from MLS (Dec. 20.38-39p4)
p3125 513125 1997 GC32 from MLS (Dec. 20.29-30p4)
p0073 510073 2010 JF88 from MLS (Dec. 20.28-30p3)
o0080 500080 2011 WV134 from MLS (Dec. 20.17-19p4)
n7094 497094 2004 AH from MLS (Dec. 20.40-41p4)
n6326 496326 2013 LB1 from MLS (Dec. 20.33-35p3 at G=20.86-22.18)
n6001 496001 2007 VR183 from MLS (Dec. 20.13-14p3)
n5891 495891 2004 VS60 from MLS (Dec. 20.08-10p4)
k7963 467963 2012 JT17 from MLS (Dec. 20.31-32p4)
k5749 465749 2009 WO6 from CSS (Dec. 20.31-32p4)
j0263 450263 2003 WD158 from MLS (Dec. 20.22-23p3)
h8902 438902 2009 WF104 from CSS (Dec. 20.27-28p4)
h5404 435404 2008 AT28 from MLS (Dec. 20.33-35p4)
h4632 434632 2005 WE from MLS (Dec. 20.46-47p4)
g8086 428086 2006 NM from CSS (Dec. 20.13-15p4)
f4586 414586 2009 UV18 from MLS (Dec. 20.15-17p4)
e4108 404108 2012 SF51 from MLS (Dec. 20.08-10p4)
c0359 380359 2002 TN30 from CSS (Dec. 20.40-41p4)
b8124 378124 2006 VT2 from MLS (Dec. 20.15-16p4)
b3579 373579 2002 AW11 from MLS (Dec. 20.24-26p4)
Z5046 355046 2006 SO19 from MLS (Dec. 20.24-26p4)
W2763 322763 2001 FA7 from MLS (Dec. 20.54-55p4)
V3809 313809 2004 BH41 from MLS (Dec. 20.44-45p4 at G=21.34-22.50)
U7493 307493 2002 XP90 from CSS (Dec. 20.42-44p4)
R6703 276703 2004 BL11 from MLS (Dec. 20.42-43p4)
R6409 276409 2002 YN2 from CSS (Dec. 20.44-46p3)
R5714 275714 2000 YH4 from Northolt Branch Obs. (Dec. 19.94p3), MLS (Dec. 20.17-19p4), and BAS Obs. (Dec. 20.85p3)
J0208 190208 2006 AQ from MLS (Dec. 20.52-54p4)
H7651 177651 2004 XM14 from ATLAS Mauna Loa (Dec. 20.29-32p4)
G3902 163902 2003 SW222 from Northolt Branch Obs. (Dec. 19.96-97p3)
G2781 162781 2000 XL44 from MLS (Dec. 20.52-54p4)
F9402 159402 1999 AP10 from program code 1 via Kitab Obs. (Sept. 26.62p1, 26.68p1, 26.73p2 & 26.80p1) and CSS (Dec. 20.31-32p4)
F4330 154330 2002 VX94 from CSS (Dec. 20.13-15p4)
F4302 154302 2002 UQ3 from ATLAS Mauna Loa (Dec. 20.26-28p4)
F2931 152931 2000 EA107 from ZTF (Dec. 19.56-57p3 & 20.56-57p3)
E2348 142348 2002 RX211 from MLS (Dec. 20.53-54p4)
E1354 141354 2002 AJ29 from MLS (Dec. 20.17-19p4 at G=21.00-22.01)
D8175 138175 2000 EE104 from CSS (Dec. 20.24-26p4)
D7805 137805 1999 YK5 from MLS (Dec. 20.06-07p3)
99935 99935 2002 AV4 from CSS (Dec. 20.33-35p4)
99799 99799 2002 LJ3 from MLS (Dec. 20.50-52p4)
90147 90147 2002 YK14 from Northolt Branch Obs. (Dec. 19.95p3) and CSS (Dec. 20.22-24p4)
89355 89355 2001 VS78 from AHS Obs. (Dec. 20.24-26p3)
88264 88264 2001 KN20 from MLS (Dec. 20.19-21p4)
87684 87684 2000 SY2 from ATLAS Mauna Loa (Dec. 20.26-28p4)
65717 65717 1993 BX3 from ATLAS Mauna Loa (Dec. 20.32-34p4)
53435 53435 1999 VM40 from CSS (Dec. 20.29-30p4)
53319 53319 1999 JM8 from MLS (Dec. 20.50-52p4)
35107 35107 1991 VH from ATLAS Mauna Loa (Dec. 20.24-26p4)
31669 31669 1999 JT6 from ZTF (Dec. 20.55-57p5)
26166 26166 1995 QN3 from SATINO-1 (2019 June 8.07-08p3)
21374 21374 1997 WS22 from CSS (Dec. 20.26-28p4)
19764 19764 2000 NF5 from MLS (Dec. 20.11-12p4)
17182 17182 1999 VU from MLS (Dec. 20.08-09p4)
08567 8567 1996 HW1 from MLS (Dec. 20.39-41p4)
07753 7753 1988 XB from MASTER OAFA Obs. (Dec. 20.21-22p2 & 20.27p1)
07480 7480 Norwan (1994 PC) from MLS (Dec. 20.54-55p4)
06053 6053 1993 BW3 from Wickede Obs. (Dec. 18.70-71p6) and BAS Obs. (Dec. 20.74p3)
04503 4503 Cleobulus (1989 WM) from MLS (Dec. 20.13-15p4) and BAS Obs. (Dec. 20.82-83p3)
03671 3671 Dionysus (1984 KD) from MLS (Dec. 20.20-21p4)
01862 1862 Apollo (1932 HA) from MLS (Dec. 20.52-54p4)
01580 1580 Betulia (1950 KA) from CSS (Dec. 20.16-17p3)

MPEC 2020-Y64 - "04:37 UT" - 2020 YK1

K20Y01K 2020 YK1 (small asteroid, Earth MOID=6.0 LD, H=25.5 ~27m) was picked up at 0433 UT on 19 Dec. by MLS, observing it at Dec. 19.19-21p4. This detection was confirmed by CSS-Kuiper (Dec. 19.31-32p4, 20.06-07p3 & 21.08-09p3), Schwarzschild Obs./code 1 (Dec. 19.73p5), and ARO Westfield (Dec. 21.01-02p2).

MPEC 2020-Y63 - "04:36 UT" - 2020 YJ1

K20Y01J 2020 YJ1 (Earth MOID=9.8 LD, H=23.8 ~59m) was picked up at 0607 UT on 19 Dec. by CSS, observing it at Dec. 19.26-27p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 19.35p4, 19.40p4, 20.14p3 & 21.16p4), Drebach Obs. (Dec. 19.82-83p5), KLENOT/code 1 (Dec. 19.87p6), Great Shefford Obs. (Dec. 19.94-95p4), Visnjan Obs. (Dec. 19.94-95p4), and Schwarzschild Obs./code 1 (Dec. 20.01p2).

Observers on 21 December '20

A total of 29 observers appear in today's MPECs.

Code	Observer / observatory
`U71`	AHS Obs., 2 in MPEC 2020-Y65 -- 89355, 501647
`H21`	Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2020-Y64 & 2020-Y78 -- 2020 YK1, 2020 YA2
`T08`	ATLAS Mauna Loa in Hawaii, 6 in MPEC 2020-Y65 -- 87684, 65717, 418849, 35107, 177651, 154302
`G17`	BAS Obs., 4 in MPEC 2020-Y65 -- 2003 YJ, 275714, 6053, 4503
`703`	Catalina Sky Survey (CSS) in Arizona, 27 in MPECs 2020-Y63, 2020-Y65 & 2020-Y73 -- 2020 YS1, 2020 YJ1, 2020 XZ4, 2020 XP2, 2020 WM5, 2020 WA5, 2020 VC7, 2020 RU, 2019 BO1, 2012 XE133, 2004 AC, 2002 GZ8, 99935, 90147, 53435, 501647, 465749, 438902, 428086, 380359, 307493, 276409, 21374, 159402, 154330, 138175, 1580
`V06`	Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 20 in MPECs 2020-Y64, 2020-Y65, 2020-Y67, 2020-Y72, 2020-Y74, 2020-Y75, 2020-Y76 & 2020-Y79 -- 2020 YV1, 2020 YU1, 2020 YR1, 2020 YM1, 2020 YK1, 2020 YK, 2020 YB2, 2020 XW6, 2020 XS, 2020 XR3, 2020 XR2, 2020 XQ3, 2020 XJ, 2020 XG6, 2020 XG5, 2020 XF, 2020 XD7, 2020 XD2, 2020 UD, 2020 SK18
`Z99`	Clixby Obs. in England, 4 in MPECs 2020-Y65 & 2020-Y68 -- 2020 YW, 2020 YN1, 2020 YB, 2020 XH6
`113`	Drebach Obs. in Germany, 1 in MPEC 2020-Y63 -- 2020 YJ1
`J95`	Great Shefford Obs. in England, 1 in MPEC 2020-Y63 -- 2020 YJ1
`U68`	JPL SynTrack Robotic Telescope, 2 in MPEC 2020-Y65 -- 2020 XQ6, 501647
`1861`	program code 1 via Kitab Obs., 1 in MPEC 2020-Y65 -- 159402
`2461`	program code 1 via KLENOT in the Czech Republic, 6 in MPECs 2020-Y63, 2020-Y66, 2020-Y69, 2020-Y70, 2020-Y71 & 2020-Y80 -- 2020 YQ1, 2020 YP1, 2020 YO1, 2020 YL1, 2020 YJ1, 2020 YE2
`W92`	MASTER OAFA Obs., 1 in MPEC 2020-Y65 -- 7753
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 71 in MPECs 2020-Y64, 2020-Y65, 2020-Y66, 2020-Y67, 2020-Y68, 2020-Y69, 2020-Y70, 2020-Y71, 2020-Y72, 2020-Y73, 2020-Y74, 2020-Y75, 2020-Y76, 2020-Y77, 2020-Y78, 2020-Y79 & 2020-Y80 -- 2020 YZ1, 2020 YV1, 2020 YU1, 2020 YS1, 2020 YR1, 2020 YQ1, 2020 YP1, 2020 YO1, 2020 YN1, 2020 YM1, 2020 YL1, 2020 YK1, 2020 YE2, 2020 YB2, 2020 YA2, 2020 XY5, 2020 XV4, 2020 XD7, 2020 WH2, 2020 WF3, 2020 WA6, 2020 VX1, 2020 VQ3, 2020 MZ3, 2020 LD3, 2015 OH, 2015 BF4, 2014 LQ26, 2012 LD1, 2011 GD60, 2006 RJ1, 2004 QC17, 2004 LU3, 2003 YS17, 2003 MS2, 2001 YV3, 99799, 88264, 53319, 513125, 510073, 500080, 497094, 496326, 496001, 495891, 467963, 450263, 435404, 434632, 414586, 404108, 378124, 373579, 355046, 322763, 313809, 276703, 275714, 19764, 190208, 17182, 162781, 142348, 141354, 137805, 8567, 7480, 4503, 3671, 1862
`Z80`	Northolt Branch Obs. in England, 10 in MPEC 2020-Y65 -- 2020 YU, 2020 XY4, 2020 TG4, 2012 XE133, 2002 TS67, 2002 GZ8, 90147, 501647, 275714, 163902
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2020-Y65 & 2020-Y76 -- 2020 XD7, 2013 BD18
`H36`	Sandlot Obs. in Kansas, 4 in MPECs 2020-Y66, 2020-Y70, 2020-Y71 & 2020-Y72 -- 2020 YR1, 2020 YQ1, 2020 YP1, 2020 YL1
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y65 -- 26166
`204`	Schiaparelli Obs. in Italy, 10 in MPEC 2020-Y65 -- 2020 YF, 2020 YD, 2020 XX3, 2020 XQ2, 2020 XO, 2020 XN, 2020 XB3, 2020 WZ5, 2020 WA5, 2020 MO
`0331`	program code 1 via Schwarzschild Obs. in Germany, 19 in MPECs 2020-Y63, 2020-Y64, 2020-Y65, 2020-Y66, 2020-Y67, 2020-Y68, 2020-Y69, 2020-Y70, 2020-Y71, 2020-Y72, 2020-Y73, 2020-Y74, 2020-Y75 & 2020-Y80 -- 2020 YW, 2020 YV1, 2020 YU1, 2020 YS1, 2020 YR1, 2020 YQ1, 2020 YP1, 2020 YO1, 2020 YN1, 2020 YM1, 2020 YL1, 2020 YK1, 2020 YJ1, 2020 YE2, 2020 YB1, 2020 YA1, 2020 XZ4, 2020 XJ3, 2020 XH6
`Q21`	Southern Utsunomiya in Japan, 1 in MPEC 2020-Y65 -- 2002 GZ8
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2020-Y65 -- 2020 XV4, 2020 XJ, 2020 WF3, 2020 WD1, 2020 VX1, 2020 OC7, 2016 JU33
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2020-Y65 -- 2020 XS, 2020 WZ4, 2007 US12
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 38 in MPECs 2020-Y63, 2020-Y65, 2020-Y66, 2020-Y68, 2020-Y69, 2020-Y70, 2020-Y71, 2020-Y72, 2020-Y73, 2020-Y74, 2020-Y75, 2020-Y77, 2020-Y78, 2020-Y79 & 2020-Y80 -- 2020 YZ1, 2020 YW, 2020 YV1, 2020 YV, 2020 YU1, 2020 YS1, 2020 YR1, 2020 YQ1, 2020 YP1, 2020 YO1, 2020 YN1, 2020 YL1, 2020 YJ1, 2020 YJ, 2020 YF, 2020 YE2, 2020 YE, 2020 YC, 2020 YB2, 2020 YB, 2020 YA2, 2020 YA1, 2020 XZ4, 2020 XZ3, 2020 XY4, 2020 XV6, 2020 XU6, 2020 XS2, 2020 XQ6, 2020 XL5, 2020 XL3, 2020 XK3, 2020 XH3, 2020 XF3, 2020 XC5, 2020 XA6, 2020 WV5, 2020 SO
`J22`	Tacande Obs. in the Canary Islands, 1 in MPEC 2020-Y65 -- 501647
`858`	Tebbutt Obs. in New Mexico, 1 in MPEC 2020-Y68 -- 2020 YN1
`L01`	Visnjan Obs. in Croatia, 1 in MPEC 2020-Y63 -- 2020 YJ1
`G33`	Wickede Obs. in Germany, 1 in MPEC 2020-Y65 -- 6053
`I41`	Zwicky Transient Facility (ZTF) in southern California, 4 in MPEC 2020-Y65 -- 2020 YU, 2014 JH57, 31669, 152931

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

Impact Risk Monitoring on 21 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 YA2	JPL Sentry	2200	2111-2120	12	1.339604e-05	-6.89	-7.35	0	JPL: Computed at 12:23 today Pacific time based on 14 observations spanning .90040 days (2020-Dec-20.24009 to 2020-Dec-21.140493). Diameter approximately 0.008 km. from weighted mean H=28.18.

2020 YM1	JPL Sentry	1740	2091-2119	18	7.399411e-05	-6.81	-7.16	0	JPL: Computed at 06:56 today Pacific time based on 15 observations spanning 1.7688 days (2020-Dec-19.434187 to 2020-Dec-21.20299). Diameter approximately 0.004 km. from weighted mean H=29.64.

2020 YL1	NEODyS	1910	2033-2120	53	2.45e-07	-3.90	-4.5	n/a	NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2020-12-19.376 to 2020-12-21.332."
2020 YL1	JPL Sentry	1740	2033-2120	70	4.288334e-07	-3.70	-4.39	0	JPL: Computed at 06:39 today Pacific time based on 31 observations spanning 1.9561 days (2020-Dec-19.375273 to 2020-Dec-21.331401). Diameter approximately 0.260 km. from weighted mean H=20.58.

2020 YB1	NEODyS	1910	2073-2120	48	1.94e-05	-5.71	-6.19	n/a	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2020-12-17.531 to 2020-12-21.229."
2020 YB1	JPL Sentry	1740	2064-2120	17	1.615004e-05	-5.81	-6.28	0	JPL: Computed at 07:03 today Pacific time based on 33 observations spanning 3.6972 days (2020-Dec-17.530488 to 2020-Dec-21.22773). Diameter approximately 0.014 km. from weighted mean H=26.89.

2020 YA1	JPL Sentry	1740	2058-2113	9	3.489134e-06	-6.77	-6.99	0	JPL: Computed at 07:11 today Pacific time based on 34 observations spanning 3.9860 days (2020-Dec-17.404234 to 2020-Dec-21.390251). Diameter approximately 0.015 km. from weighted mean H=26.74.

2020 XV6	NEODyS	1910	2099-2105	7	9.7e-07	-4.60	-4.95	0	NEODyS: "Based on 90 optical observations (of which 1 are rejected as outliers) from 2020-12-15.121 to 2020-12-21.166."
2020 XV6	JPL Sentry	1740	2102-2102	2	4.255e-07	-4.95	-5.11	0	JPL: Computed at 07:05 today Pacific time based on 90 observations spanning 6.0453 days (2020-Dec-15.120177 to 2020-Dec-21.165479). Diameter approximately 0.095 km. from weighted mean H=22.75.

2020 XU6	NEODyS	1910	2057-2117	4	1.26e-08	-6.47	-6.74	0	NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2020-12-14.363 to 2020-12-21.317."
2020 XU6	JPL Sentry	1740	2047-2117	31	5.118936e-07	-4.74	-5.20	0	JPL: Computed at 07:04 today Pacific time based on 32 observations spanning 6.9544 days (2020-Dec-14.362132 to 2020-Dec-21.316497). Diameter approximately 0.171 km. from weighted mean H=21.46.

2020 XA6	JPL Sentry	1740	2057-2073	5	2.08493e-06	-4.95	-5.38	0	JPL: Computed at 07:02 today Pacific time based on 83 observations spanning 7.0565 days (2020-Dec-14.124162 to 2020-Dec-21.180706). Diameter approximately 0.052 km. from weighted mean H=24.07.

2020 XU4	JPL Sentry	1740	2112-2112	1	1.010e-06	-7.78	-7.78	0	JPL: Computed at 09:04 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 XX3	JPL Sentry	1740	2094-2094	1	2.459e-07	-8.65	-8.65	0	JPL: Computed at 07:29 today Pacific time based on 99 observations spanning 7.6837 days (2020-Dec-10.276407 to 2020-Dec-17.960095). Diameter approximately 0.007 km. from weighted mean H=28.47.

2020 XF	NEODyS	1910	2056-2120	549	1.22e-03	-3.94	-4.08	n/a	NEODyS: "Based on 86 optical observations (of which 1 are rejected as outliers) from 2020-12-04.328 to 2020-12-21.117."
2020 XF	JPL Sentry	1740	2056-2119	128	0.00036792222	-4.53	-5.02	0	JPL: Computed at 07:02 today Pacific time based on 86 observations spanning 16.790 days (2020-Dec-04.32683 to 2020-Dec-21.116554). Diameter approximately 0.015 km. from weighted mean H=26.70.

2020 VW	JPL Sentry	1800	2074-2087	15	0.0070404163963	-3.84	-4.12	0	JPL: Computed at 09:41 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.

2020 VV	JPL Sentry	1800	2044-2111	108	0.001787460372	-3.99	-4.37	0	JPL: Computed at 09:43 today Pacific time based on 76 observations spanning 61.112 days (2020-Oct-17.214515 to 2020-Dec-17.326949). Diameter approximately 0.012 km. from weighted mean H=27.25.

2016 YC13	JPL Sentry	1740	2087-2116	7	2.12266e-08	-8.63	-8.73	0	JPL: Computed at 18:09 April 9th of 2017 Pacific time based on 19 observations spanning .11002 days (2016-Dec-27.28622 to 2016-Dec-27.396239). Diameter approximately 0.016 km. from weighted mean H=26.68.

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 21 December '20

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

2320	Grabbed MPEC 2020-Y80 - 2020 YE2 - see above
2200	Noted that JPL Sentry has posted 2020 YA2 as an impact risk - see above
1910	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 updated its 2020 YB1 risk assessment - see above Noted that NEODyS has posted 2020 YL1 as an impact risk - see above Grabbed MPEC 2020-Y77 - 2020 YZ1 - see above Grabbed MPEC 2020-Y78 - 2020 YA2 - see above Grabbed MPEC 2020-Y79 - 2020 YB2 - see above
1800	Noted that JPL Sentry has updated its 2020 VV risk assessment - see above Noted that JPL Sentry has updated its 2020 VW risk assessment - see above
1740	Noted that JPL Sentry has updated its 2016 YC13 risk assessment - see above 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 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 JPL Sentry has updated its 2020 XX3 risk assessment - see above Noted that JPL Sentry has updated its 2020 YA1 risk assessment - see above Noted that JPL Sentry has updated its 2020 YB1 risk assessment - see above Noted that JPL Sentry has posted 2020 YL1 as an impact risk - see above Noted that JPL Sentry has posted 2020 YM1 as an impact risk - see above Grabbed MPEC 2020-Y65 - Daily Orbit Update - see above Grabbed MPEC 2020-Y66 - 2020 YL1 - see above Grabbed MPEC 2020-Y67 - 2020 YM1 - see above Grabbed MPEC 2020-Y68 - 2020 YN1 - see above Grabbed MPEC 2020-Y69 - 2020 YO1 - see above Grabbed MPEC 2020-Y70 - 2020 YP1 - see above Grabbed MPEC 2020-Y71 - 2020 YQ1 - see above Grabbed MPEC 2020-Y72 - 2020 YR1 - see above Grabbed MPEC 2020-Y73 - 2020 YS1 - see above Grabbed MPEC 2020-Y74 - 2020 YU1 - see above Grabbed MPEC 2020-Y75 - 2020 YV1 - see above Grabbed MPEC 2020-Y76 - 2020 XD7 - see above
0600	Grabbed MPEC 2020-Y63 - 2020 YJ1 - see above Grabbed MPEC 2020-Y64 - 2020 YK1 - see above

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