2020-12-23 Tracking News

Contents on 23 December '20

IAU Minor Planet Center
- NEOCP Activity -- 48 listings
- New MPECs -- nine MPECs
Observers -- 35 observers
Impact Risk Monitoring -- eleven 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 1249 risk-listed objects, 157 have had news in the last 31 days. Updated at 2359 UTC on 23 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 23 December '20

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 61 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 23 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-Y98 time-stamped "02:10 UT" - IAWN Planetary Defense Exercise: Apophis - see below
MPEC 2020-Y99 time-stamped "02:33 UT" - 2020 YY2 - see below
MPEC 2020-Y100 time-stamped "04:21 UT" - 2020 YZ2 - see below
MPEC 2020-Y101 time-stamped "12:33 UT" - Daily Orbit Update - see below
MPEC 2020-Y102 time-stamped "14:09 UT" - 2020 YA3 - see below
MPEC 2020-Y103 time-stamped "14:10 UT" - 2020 YB3 - see below
MPEC 2020-Y104 time-stamped "14:11 UT" - 2020 YC3 - see below
MPEC 2020-Y105 time-stamped "15:00 UT" - 2016 AU192 - see below
MPEC 2020-Y106 time-stamped "18:49 UT" - 2020 YG3

MPEC 2020-Y106 - "18:49 UT" - 2020 YG3

K20Y03G 2020 YG3 (Earth MOID=1.1 LD, H=26.9 ~14m) was picked up at 0439 UT on 22 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 22.19-21p4. This detection was confirmed by Tebbutt Obs. (Dec. 22.25-28p3), Steward Obs. Mt. Lemmon Station (Dec. 22.33-34p4), Pan-STARRS 1 (PS1) (Dec. 22.36-37p2), Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 23.04-05p4), and Astronomical Research Obs. Westfield (Dec. 23.12-13p3).

MPEC 2020-Y105 - "15:00 UT" - 2016 AU192

K16AJ2U 2016 AU192 (borderline-small, H=21.9 ~141m) from UH/Tholen NEO Follow-Up 2.24m Telescope (2016 Nov. 29.38-39p2 at G=23.06-39), Las Campanas Obs. (Dec. 18.36p2 at G=23.41-49), and UH/Tholen NEO Follow-Up CFH Telescope (Dec. 22.64p3 at G=23.14-20)

MPEC 2020-Y104 - "14:11 UT" - 2020 YC3

K20Y03C 2020 YC3 (risk listed, H=20.2 ~309m) was picked up at 0631 UT on 21 Dec. by MLS, observing it at Dec. 21.27-29p4 at G=21.07-22.04. This detection was confirmed by the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 21.41-42p4, 22.25-26p4 & 23.28p2), Holmes/CTIO (Dec. 22.18p3), and ARO Westfield (Dec. 22.20-22p4).

MPEC 2020-Y103 - "14:10 UT" - 2020 YB3

K20Y03B 2020 YB3 (small asteroid, H=26.7 ~15m) was picked up at 0853 UT on 21 Dec. by MLS, observing it at Dec. 21.37-38p3 and 22.39-40p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 21.52p3), PS1 (Dec. 22.49-51p3), and CSS-Kuiper (Dec. 23.33-34p4).

MPEC 2020-Y102 - "14:09 UT" - 2020 YA3

K20Y03A 2020 YA3 (risk listed, Earth MOID=0.5 LD, H=26.0 ~21m, close passer) was picked up at 0832 UT on 21 Dec. by the Catalina Sky Survey (CSS), observing it at Dec. 21.36-37p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 21.47p4, 21.54p4, 22.47p4 & 23.35p4), ARO Westfield (Dec. 22.33p3), and CSS-Kuiper (Dec. 23.37p3).

<< DOU on 23 December '20 >> MPEC 2020-Y101 - "12:33 UT" - Daily Orbit Update

Observations of risk-listed objects
K20Y02S 2020 YS2 (small asteroid, arc=2 days, H=31.0 ~2m, close passer, NHATS target) from the Spacewatch 1.8m telescope (Dec. 23.30-31p3)
K20Y02R 2020 YR2 (small asteroid, arc=2 days, H=28.2 ~8m, close passer, NHATS target) from LCO Siding Spring B (Dec. 22.61p9) and Spacewatch 1.8m (Dec. 23.32p2)
K20Y02G 2020 YG2 from Holmes/CTIO (Dec. 22.06-07p3)
K20Y01L 2020 YL1 from Spacewatch 1.8m (Dec. 22.50p3)
K20Y01A 2020 YA1 (small asteroid, arc=6 days, H=26.7 ~15m, close passer, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 22.49-50p4 & 23.45p4)
K20X06U 2020 XU6 (arc=9 days, H=21.3 ~186m) from Holmes/CTIO (Dec. 22.31-32p2) and Spacewatch 1.8m (Dec. 23.35-38p3)
K20X00F 2020 XF (small asteroid, arc=19 days, H=26.7 ~15m, close passer, NHATS target) from CSS-Kuiper (Dec. 23.08-09p3)
99942 99942 Apophis (2004 MN4) (NHATS target) from CSS (Dec. 4.46p1, 15.43-44p2 & 19.43-44p3), ATLAS Haleakala (Dec. 11.62-65p4), PS1 (Dec. 15.58-62p3, 21.60-64p3 & 22.59-62p3), NEOWISE (Dec. 18.98p1, 19.11p1, 19.24p2, 19.63p1, 19.70p1, 19.76p1, 19.83p1, 19.89p1 & 19.96p1), ATLAS Mauna Loa (Dec. 21.62-65p4), ARO Westfield (Dec. 22.40-43p2), the Spacewatch 0.9m telescope (Dec. 22.40-42p3), Farpoint Obs. (Dec. 22.44-47p3), Steward Mt. Lemmon Sta. (Dec. 22.47-48p4), MLS (Dec. 22.51-52p4), and Pan-STARRS 2 (PS2) (Dec. 22.62-65p4)
Observations of recently (no longer) risk-listed objects
K20Y00F 2020 YF (small asteroid, Q=0.988 AU, arc=6 days, H=28.8 ~6m, close passer, NHATS target) from CSS-Kuiper (Dec. 23.07-08p3)
Observations of close-passing objects
K20Y02L 2020 YL2 (arc=3 days, H=24.9 ~35m) from LCO McDonald Obs. B (Dec. 22.26p5)
K20Y02J 2020 YJ2 from Clixby Obs. (Dec. 22.87p2)
K20Y01J 2020 YJ1 from Holmes/CTIO (Dec. 22.15-16p3)
K20X04V 2020 XV4 (arc=11 days, H=25.4 ~28m) from Spacewatch via Kitt Peak Natl. Obs. (KPNO) (Dec. 23.30p2)
K20X04C 2020 XC4 (arc=14 days, H=26.0 ~21m, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 23.09p4)
K20X01H 2020 XH1 from Holmes/CTIO (Dec. 22.22-23p4)
K13F00K 2013 FK (radar support) from Spacewatch 1.8m (Dec. 22.52-53p2)
o1647 501647 2014 SD224 from ATLAS Mauna Loa (Dec. 23.27-30p8)
Observation campaigns (NHATS targets, radar support)
K20Y02X 2020 YX2 (NHATS) from Holmes/CTIO (Dec. 22.26-28p4)
K20X06L 2020 XL6 (NHATS) from CSS-Kuiper (Dec. 22.50-51p4)
K20X02T 2020 XT2 (NHATS) from Holmes/CTIO (Dec. 22.18p3)
K20W01D 2020 WD1 (NHATS) from MLS (Dec. 22.15-17p4 at G=20.66-22.29)
K11G60D 2011 GD60 (NHATS) from PS2 (Dec. 22.39-42p4)
J98K26Y 1998 KY26 (NHATS) from Ondrejov Obs. (1998 May 31.93p1, 1998 May 31.98p4, 1998 June 1.98-03p8, 1998 June 2.88-91p5, 1998 June 2.96-02p4, 1998 June 5.03p6, 1998 June 5.94-95p2, 1998 June 5.99p2, 1998 June 6.04p5 & 1998 June 7.01-05p7) and Modra Obs. (1998 June 1.91-92p4, 1998 June 4.90-91p3 & 1998 June 6.99-01p4)
f8849 418849 2008 WM64 (radar) from ATLAS Haleakala (Dec. 22.29-31p4)
G3693 163693 Atira (2003 CP20) (radar) from CSS (Dec. 22.54-56p4)
11398 11398 1998 YP11 (radar) from MLS (Dec. 22.11-12p4)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y02Z 2020 YZ2 (arc=2 days, H=24.4 ~45m) from Holmes/CTIO (Dec. 23.14-15p3)
K20Y01V 2020 YV1 (arc=4 days, H=24.5 ~43m) from Steward Mt. Lemmon Sta. (Dec. 23.42p4)
K20Y01Q 2020 YQ1 (arc=4 days, H=23.3 ~74m) from Steward Mt. Lemmon Sta. (Dec. 23.45p4)
K20Y01O 2020 YO1 (arc=4 days, H=25.7 ~25m) from Steward Mt. Lemmon Sta. (Dec. 23.43-44p4)
K20Y00M 2020 YM (arc=6 days, H=26.7 ~15m) from CSS-Kuiper (Dec. 23.43-44p2 at G=21.33-22.07)
K20X02E 2020 XE2 (arc=16 days, H=24.3 ~47m) from Spacewatch/KPNO (Dec. 23.32-33p3)
K20X00Y 2020 XY (arc=18 days, H=25.4 ~28m) from Steward Mt. Lemmon Sta. (Dec. 22.52-53p4 & 23.41-42p4)
K20X00K 2020 XK (arc=19 days, H=24.7 ~39m) from Steward Mt. Lemmon Sta. (Dec. 22.50-51p4 & 23.46-48p3)
K10V21Q 2010 VQ21 (arc=83 days, H=22.2 ~123m) from PS1 (2010 Sept. 18.50-51p2 & 2010 Sept. 27.51-53p2)
K10V00J 2010 VJ (arc=48 days, H=22.6 ~102m) from PS1 (2010 Oct. 15.41-43p2)
K20Y01P 2020 YP1 (i=36.4°, q=0.351 AU, arc=4 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 23.44-45p4)
K20S01T 2020 ST1 (arc=118 days, H=21.9 ~141m) from Spacewatch 0.9m (Dec. 23.33-34p3)
Observations of other objects
K20Y02V 2020 YV2 from Holmes/CTIO (Dec. 22.29-32p4)
K20Y02T 2020 YT2 (arc=3 days, H=21.0 ~214m) from PS2 (Dec. 22.53-55p3) and CSS-Kuiper (Dec. 23.47-48p4 at G=21.24-22.50)
K20Y02H 2020 YH2 from Holmes/CTIO (Dec. 22.07-09p3 at G=22.0-22.1)
K20Y00P 2020 YP from Holmes/CTIO (Dec. 22.34-35p3) and Steward Mt. Lemmon Sta. (Dec. 22.52p4)
K20Y00J 2020 YJ from Steward Mt. Lemmon Sta. (Dec. 22.51p3)
K20X07C 2020 XC7 from MLS (Dec. 22.08-10p4) and Holmes/CTIO (Dec. 22.13-14p2)
K20X06F 2020 XF6 from Holmes/CTIO (Dec. 22.33-34p4)
K20X05C 2020 XC5 from Holmes/CTIO (Dec. 22.04-05p3)
K20X05B 2020 XB5 from CSS-Kuiper (Dec. 22.49-50p4)
K20X04T 2020 XT4 (arc=15 days, H=21.2 ~195m) from Steward Mt. Lemmon Sta. (Dec. 22.53-54p4 & 23.48-49p4)
K20X04H 2020 XH4 from Holmes/CTIO (Dec. 22.19-20p3)
K20X04A 2020 XA4 from MLS (Dec. 22.27-28p4)
K20X03K 2020 XK3 from Holmes/CTIO (Dec. 22.04-06p4) and MLS (Dec. 22.08-10p4 at G=20.66-22.09)
K20X03F 2020 XF3 from Steward Mt. Lemmon Sta. (Dec. 22.54p3)
K20X00V 2020 XV from Spacewatch 1.8m (Dec. 22.49-50p2)
K20W05T 2020 WT5 from Holmes/CTIO (Dec. 22.10-11p3)
K20W05C 2020 WC5 from Steward Mt. Lemmon Sta. (Dec. 22.54-55p4)
K20W05B 2020 WB5 from Holmes/CTIO (Dec. 22.35p3 at G=22.0-22.2)
K20W05A 2020 WA5 from Steward Mt. Lemmon Sta. (Dec. 22.54-55p4)
K20W04V 2020 WV4 from CSS-Kuiper (Dec. 22.52-53p3 at G=21.61-22.30)
K20W04J 2020 WJ4 (arc=39 days, H=20.9 ~224m) from Spacewatch 0.9m (Dec. 23.40-41p3)
K20W03O 2020 WO3 from Holmes/CTIO (Dec. 22.11-12p3 at G=22.2-3)
K20W03M 2020 WM3 from Steward Mt. Lemmon Sta. (Dec. 22.52-53p4)
K20W02H 2020 WH2 from PS2 (Dec. 22.54-56p3)
K20W01Z 2020 WZ1 from JPL SynTrack Robotic Telescope (Dec. 22.19-22p4) and Holmes/CTIO (Dec. 22.25-26p3)
K20V05Z 2020 VZ5 (arc=39 days, H=21.0 ~214m) from Spacewatch 1.8m (Dec. 23.34p2)
K20V03M 2020 VM3 from Steward Mt. Lemmon Sta. (Dec. 22.54-55p3)
K20U01V 2020 UV1 from MLS (Dec. 22.22-24p4 at G=21.65-22.29) and PS1 (Dec. 22.38-41p3)
K20T07T 2020 TT7 from Holmes/CTIO (Dec. 22.24-25p3) and MLS (Dec. 22.29-30p4)
K20T03G 2020 TG3 from Holmes/CTIO (Dec. 22.27-28p3)
K20R09O 2020 RO9 from PS1 (Dec. 22.53-56p4)
K20Q02Z 2020 QZ2 (Q=4.239 AU, arc=134 days, H=20.7 ~245m) from Holmes/CTIO (Dec. 23.05-09p3 at G=22.6-8)
K20P01D 2020 PD1 (Q=4.135 AU, arc=184 days, H=19.2 ~490m) from Holmes/CTIO (Dec. 22.04-05p3) and Spacewatch 0.9m (Dec. 23.12-14p3)
K20K26K 2020 KK26 from MLS (Dec. 22.25-26p4)
K20H01F 2020 HF1 from PS1 (Dec. 22.54-56p3 at w=22.2-5)
K19A06P 2019 AP6 (arc=2 opp, H=21.1 ~204m) from Spacewatch 1.8m (Dec. 23.42-44p3 at R=22.1-5)
K19A05N 2019 AN5 from PS2 (Dec. 22.48-51p3)
K18G04E 2018 GE4 from PS1 (Dec. 22.47-51p4 at w=21.8-22.3)
K17S20V 2017 SV20 from MLS (Dec. 22.13-14p4)
K17A05F 2017 AF5 (q=0.124 AU, Q=4.833 AU, arc=4 opp, H=17.7 ~977m) from Spacewatch 0.9m (Dec. 23.42-43p3)
K16P39O 2016 PO39 from Spacewatch 0.9m (Dec. 22.48-50p3)
K16EF6E 2016 EE156 from PS1 (Dec. 22.43-46p4)
K16C32B 2016 CB32 from PS2 (Dec. 22.53-56p4)
K16B01N 2016 BN1 from PS1 (Dec. 22.47-51p3)
K15TE4W 2015 TW144 from PS1 (Dec. 22.61-64p6)
K15L21K 2015 LK21 (Q=4.434 AU, arc=3 opp, H=17.8 ~933m) from Spacewatch 0.9m (Dec. 23.33-35p3)
K15Bp0W 2015 BW510 from PS1 (Dec. 22.43-46p4)
K15B04F 2015 BF4 from CSS (Dec. 22.18-19p4) and ATLAS Mauna Loa (Dec. 22.34-39p4)
K15A45S 2015 AS45 from CSS (Dec. 22.35-36p4) and MLS (Dec. 22.42-44p4)
K14A16C 2014 AC16 from Spacewatch 0.9m (Dec. 22.22-24p3)
K12U68M 2012 UM68 from PS1 (Dec. 22.53-56p3)
K11W02L 2011 WL2 from PS1 (Dec. 22.44-46p3)
K10VJ8U 2010 VU198 from MLS (Dec. 22.27-29p4)
K03Y01M 2003 YM1 from ATLAS Mauna Loa (Dec. 22.47-48p4)
K03Y00J 2003 YJ from CSS (Dec. 22.16-17p4)
K03B47K 2003 BK47 from CSS (Dec. 22.33-34p3) and MLS (Dec. 22.38-39p4)
K02T67S 2002 TS67 from ATLAS Mauna Loa (Dec. 22.46-52p4)
K02G08Z 2002 GZ8 from ATLAS Mauna Loa (Dec. 22.58-61p4)
K01Y03U 2001 YU3 from ATLAS Mauna Loa (Dec. 22.38-41p4)
J99V15X 1999 VX15 from MLS (Dec. 22.31-33p4)
q3633 523633 2009 XR2 from MLS (Dec. 22.44-46p4) and ATLAS Haleakala (Dec. 22.56-57p4)
p3125 513125 1997 GC32 from ATLAS Mauna Loa (Dec. 22.37-42p4)
p1520 511520 2014 QW296 from PS1 (Dec. 22.53-56p4)
o8767 508767 1993 BD2 from CSS (Dec. 21.43p1) and ATLAS Mauna Loa (Dec. 22.57-58p4)
o6779 506779 2006 YY2 from CSS (Dec. 22.26-28p3)
o6459 506459 2002 AL14 from CSS (Dec. 22.43-45p4), MLS (Dec. 22.52-54p4), and PS2 (Dec. 22.62-64p3)
m2228 482228 2011 BH10 from MLS (Dec. 22.06-07p4)
m1918 481918 2009 BE77 from MLS (Dec. 22.29-30p3)
l0864 470864 2008 YV148 from PS1 (Dec. 22.52-56p4)
j7768 457768 2009 KN4 from PS2 (Dec. 22.47-50p3)
j2307 452307 Manawydan (1997 XV11) from MLS (Dec. 22.13-14p4)
j0263 450263 2003 WD158 from CSS (Dec. 22.20-21p4) and ATLAS Mauna Loa (Dec. 22.34-39p4)
i9107 449107 2012 VJ82 from ATLAS Haleakala (Dec. 22.60-61p8)
h8902 438902 2009 WF104 from ATLAS Mauna Loa (Dec. 22.48-51p4)
g8086 428086 2006 NM from ATLAS Mauna Loa (Dec. 22.28-34p8)
f7581 417581 2006 VA3 from PS1 (Dec. 22.54-56p3)
f5987 415987 2002 AE9 from MLS (Dec. 22.40-42p4)
f5029 415029 2011 UL21 from ATLAS Mauna Loa (Dec. 22.42-43p3)
c0929 380929 2006 HU30 from PS1 (Dec. 22.23-28p6)
b3579 373579 2002 AW11 from PS2 (Dec. 22.39-42p3)
Y7813 347813 2002 NP1 from MLS (Dec. 22.06-07p4)
Y5705 345705 2006 VB14 from ATLAS Mauna Loa (Dec. 22.26-29p4)
X3578 333578 2006 KM103 from MLS (Dec. 22.38-39p3)
V3809 313809 2004 BH41 from PS2 (Dec. 22.53-57p4)
U7493 307493 2002 XP90 from ATLAS Mauna Loa (Dec. 22.61-65p4)
U5090 305090 2007 VQ4 from ATLAS Mauna Loa (Dec. 22.60-66p4)
R5714 275714 2000 YH4 from CSS (Dec. 22.13-15p4) and ATLAS Mauna Loa (Dec. 22.30-32p4)
Q5661 265661 2005 UB from CSS (Dec. 22.41-43p3)
O1596 241596 1998 XM2 from CSS (Dec. 22.28-29p3) and ATLAS Mauna Loa (Dec. 22.41-44p5)
M4926 224926 2007 DA41 from PS1 (Dec. 22.43-46p3)
L6707 216707 2004 XP164 from CSS (Dec. 22.35-36p4)
J9145 199145 2005 YY128 from MLS (Dec. 22.55p4)
J0758 190758 2001 QH96 from PS1 (Dec. 22.48-51p3)
I9040 189040 2000 MU1 from MLS (Dec. 22.37-39p4)
I6822 186822 2004 FE31 from CSS (Dec. 22.15-17p4)
G3364 163364 2002 OD20 from ATLAS Mauna Loa (Dec. 22.30-33p4)
G2186 162186 1999 OP3 from ATLAS Mauna Loa (Dec. 22.46-50p4)
G2039 162039 1996 JG from ATLAS Mauna Loa (Dec. 22.41-44p3)
G1989 161989 Cacus (1978 CA) from CSS (Dec. 22.50-52p4)
F9923 159923 2004 YJ32 from PS2 (Dec. 22.47-51p4)
F9608 159608 2002 AC2 from ATLAS Haleakala (Dec. 22.38-40p4)
F9402 159402 1999 AP10 from Golden Ears Obs. (Dec. 23.27-28p3)
F4330 154330 2002 VX94 from PS1 (Dec. 22.22-24p3) and ATLAS Mauna Loa (Dec. 22.28-32p4)
F4144 154144 2002 FA5 from PS1 (Dec. 22.43-46p4)
F3201 153201 2000 WO107 from Althuraya Astronomy Ctr. (Dec. 21.70-76p5) and ATLAS Mauna Loa (Dec. 22.30-34p8)
F2978 152978 2000 GJ147 from PS1 (Dec. 22.22-25p4)
F2941 152941 2000 FM10 from ATLAS Mauna Loa (Dec. 22.59-61p4)
E4411 144411 2004 EW9 from ATLAS Mauna Loa (Dec. 22.29-31p4)
E3678 143678 2003 SA224 from CSS (Dec. 22.52-54p4)
E1079 141079 2001 XS30 from MLS (Dec. 22.31-33p4)
D8947 138947 2001 BA40 from ATLAS Mauna Loa (Dec. 22.36-38p4)
A5140 105140 2000 NL10 from CSS (Dec. 22.07-08p3)
99935 99935 2002 AV4 from ATLAS Mauna Loa (Dec. 22.55-56p4)
89355 89355 2001 VS78 from ATLAS Mauna Loa (Dec. 22.46-47p4)
87684 87684 2000 SY2 from ATLAS Haleakala (Dec. 22.27-30p4)
86450 86450 2000 CK33 from ATLAS Haleakala (Dec. 22.60-61p4)
85275 85275 1994 LY from CSS (Dec. 22.17-19p4) and ATLAS Haleakala (Dec. 22.38-40p4)
55532 55532 2001 WG2 from CSS (Dec. 22.18-19p4)
53435 53435 1999 VM40 from Golden Ears Obs. (Dec. 23.24-25p3)
53430 53430 1999 TY16 from ATLAS Mauna Loa (Dec. 22.20-24p4)
40263 40263 1999 FQ5 from MLS (Dec. 22.53-54p4) and PS2 (Dec. 22.62-66p4)
38091 38091 1999 JT3 from PS1 (Dec. 22.54-56p3)
36183 36183 1999 TX16 from ATLAS Haleakala (Dec. 22.26-30p5)
35107 35107 1991 VH from ATLAS Haleakala (Dec. 22.26-28p4)
29075 29075 1950 DA from ATLAS Mauna Loa (Dec. 22.59-61p4)
27031 27031 1998 RO4 from SATINO-1 (July 16.06-09p2)
23183 23183 2000 OY21 from ATLAS Mauna Loa (Dec. 22.61-63p4)
21088 21088 Chelyabinsk (1992 BL2) from ATLAS Mauna Loa (Dec. 22.51-54p4)
19764 19764 2000 NF5 from program code 1 via Kitab Obs. (Sept. 21.75-76p2, 21.81p1, 21.97-98p2, Oct. 12.66-67p2 & 12.83-84p2)
16834 16834 1997 WU22 from ATLAS Mauna Loa (Dec. 22.29-31p4)
11405 11405 1999 CV3 from CSS (Dec. 22.06-08p4) and ATLAS Haleakala (Dec. 22.23-26p4)
10115 10115 1992 SK from ATLAS Mauna Loa (Dec. 22.25-28p4)
08567 8567 1996 HW1 from PS1 (Dec. 22.48-51p4)
07977 7977 1977 QQ5 from ATLAS Haleakala (Dec. 22.21-24p4)
07753 7753 1988 XB from ATLAS Mauna Loa (Dec. 22.36-41p4)
05879 5879 Almeria (1992 CH1) from ATLAS Haleakala (Dec. 22.58-62p4)
05836 5836 1993 MF from ATLAS Mauna Loa (Dec. 22.45-49p3)
05587 5587 1990 SB from CSS (Dec. 22.18-19p4)
05131 5131 1990 BG from ATLAS Mauna Loa (Dec. 22.62-66p4)
04957 4957 Brucemurray (1990 XJ) from ATLAS Haleakala (Dec. 22.63-66p4)
04953 4953 1990 MU from ATLAS Haleakala (Dec. 22.24-27p4)
04055 4055 Magellan (1985 DO2) from CSS (Dec. 22.15-17p4) and ATLAS Haleakala (Dec. 22.37-39p4)
03360 3360 Syrinx (1981 VA) from ATLAS Mauna Loa (Dec. 22.38-43p4)
03122 3122 Florence (1981 ET3) from CSS (Dec. 22.45-47p4)
02368 2368 Beltrovata (1977 RA) from ATLAS Mauna Loa (Dec. 22.38-43p3)
02212 2212 Hephaistos (1978 SB) from ATLAS Mauna Loa (Dec. 22.27-31p4)
01981 1981 Midas (1973 EA) from CSS (Dec. 22.09-10p3)
01943 1943 Anteros (1973 EC) from CSS (Dec. 22.48-50p4) and ATLAS Haleakala (Dec. 22.62-67p7)
01685 1685 Toro (1948 OA) from CSS (Dec. 22.50-52p4) and ATLAS Haleakala (Dec. 22.62-66p4)
01580 1580 Betulia (1950 KA) from ATLAS Mauna Loa (Dec. 22.34-39p4)
01036 1036 Ganymed (1924 TD) from ATLAS Haleakala (Dec. 22.48-53p4)
00887 887 Alinda (1918 DB) from Kitab Obs./code 1 (Oct. 12.70p2 & 12.85-87p2)

MPEC 2020-Y100 - "04:21 UT" - 2020 YZ2

K20Y02Z 2020 YZ2 (small asteroid, H=24.43 ~44m) was picked up at 0446 UT on 21 Dec. by MLS, observing it at Dec. 21.20-22p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 21.38p4 & 22.17p4), Holmes/CTIO (Dec. 22.16-17p3), Tebbutt Obs. (Dec. 22.19-21p3), and ARO Westfield (Dec. 23.11-12p3).

MPEC 2020-Y99 - "02:33 UT" - 2020 YY2

K20Y02Y 2020 YY2 (small asteroid, Earth MOID=4.0 LD, H=22.4 ~112m) was picked up at 0340 UT on 21 Dec. by CSS, observing it at Dec. 21.15-17p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 21.25p4, 21.31p4, 22.08p4 & 23.09p4), Tebbutt Obs. (Dec. 21.27-28p4 & 22.05-06p4), AstroColauri Obs. (Dec. 21.86-88p3), ARO Westfield (Dec. 21.98p3 & 22.99p5), Squirrel Valley Obs. (Dec. 21.98-99p3), Mountainville Obs. (Dec. 22.04-07p2), Farpoint Obs. (Dec. 22.05p2), Transit Dreams Obs. (Dec. 22.14-16p3), M57 Obs. (Dec. 22.73-75p3), Salvatore di Giacomo Obs. (Dec. 22.83-84p2), and Clixby Obs. (Dec. 22.84-85p4).

MPEC 2020-Y98 - "02:10 UT" - IAWN Planetary Defense Exercise: Apophis

N00hp15 N00hp15 (H=19.15 ~501m) was picked up at 1041 UT on 4 Dec. by CSS, observing it at Dec. 4.45-46p4, 15.43-44p2, 16.42-43p4, and 19.43-44p3. This detection was confirmed by ATLAS Haleakala (Dec. 7.58-60p4, 10.64-66p4 & 11.62-65p4), ATLAS Mauna Loa (Dec. 9.57-59p4 & 21.62-65p4), PS1 (Dec. 12.60-61p2, 15.58-62p3, 21.60-64p3 & 22.59-62p3), NEOWISE (Dec. 18.98p1, 19.11p1, 19.24p2, 19.63p1, 19.70p1, 19.76p1, 19.83p1, 19.89p1 & 19.96p1), ARO Westfield (Dec. 22.40-43p2), Spacewatch 0.9m (Dec. 22.40-42p3), Farpoint Obs. (Dec. 22.44-47p3), Steward Mt. Lemmon Sta. (Dec. 22.47-48p4), MLS (Dec. 22.51-52p4), and PS2 (Dec. 22.62-65p4).

Observers on 23 December '20

A total of 35 observers appear in today's MPECs.

Code	Observer / observatory
`M46`	Althuraya Astronomy Ctr., 1 in MPEC 2020-Y101 -- 153201
`L74`	AstroColauri Obs., 1 in MPEC 2020-Y99 -- 2020 YY2
`H21`	Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2020-Y98, 2020-Y99, 2020-Y100, 2020-Y101, 2020-Y102, 2020-Y104 & 2020-Y106 -- N00hp15, 2020 YZ2, 2020 YY2, 2020 YG3, 2020 YC3, 2020 YA3, 99942
`T05`	ATLAS Haleakala in Hawaii, 20 in MPECs 2020-Y98 & 2020-Y101 -- N00hp15, 99942, 87684, 86450, 85275, 523633, 449107, 418849, 36183, 35107, 159608, 11405, 7977, 5879, 4957, 4953, 4055, 1943, 1685, 1036
`T08`	ATLAS Mauna Loa in Hawaii, 42 in MPECs 2020-Y98 & 2020-Y101 -- N00hp15, 2015 BF4, 2003 YM1, 2002 TS67, 2002 GZ8, 2001 YU3, 99942, 99935, 89355, 53430, 513125, 508767, 501647, 450263, 438902, 428086, 415029, 345705, 307493, 305090, 29075, 275714, 241596, 23183, 21088, 16834, 163364, 162186, 162039, 154330, 153201, 152941, 144411, 138947, 10115, 7753, 5836, 5131, 3360, 2368, 2212, 1580
`703`	Catalina Sky Survey (CSS) in Arizona, 30 in MPECs 2020-Y98, 2020-Y99, 2020-Y101 & 2020-Y102 -- N00hp15, 2020 YY2, 2020 YA3, 2015 BF4, 2015 AS45, 2003 YJ, 2003 BK47, 99942, 85275, 55532, 508767, 506779, 506459, 450263, 275714, 265661, 241596, 216707, 186822, 163693, 161989, 143678, 11405, 105140, 5587, 4055, 3122, 1981, 1943, 1685
`V06`	Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 10 in MPECs 2020-Y101, 2020-Y102, 2020-Y103 & 2020-Y104 -- 2020 YT2, 2020 YM, 2020 YF, 2020 YC3, 2020 YB3, 2020 YA3, 2020 XL6, 2020 XF, 2020 XB5, 2020 WV4
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 25 in MPECs 2020-Y100, 2020-Y101, 2020-Y104 & 2020-Y106 -- 2020 YZ2, 2020 YX2, 2020 YV2, 2020 YP, 2020 YJ1, 2020 YH2, 2020 YG3, 2020 YG2, 2020 YC3, 2020 XU6, 2020 XT2, 2020 XK3, 2020 XH4, 2020 XH1, 2020 XF6, 2020 XC7, 2020 XC5, 2020 WZ1, 2020 WT5, 2020 WO3, 2020 WB5, 2020 TT7, 2020 TG3, 2020 QZ2, 2020 PD1
`Z99`	Clixby Obs. in England, 2 in MPECs 2020-Y99 & 2020-Y101 -- 2020 YY2, 2020 YJ2
`734`	Farpoint Obs. in Kansas, 3 in MPECs 2020-Y98, 2020-Y99 & 2020-Y101 -- N00hp15, 2020 YY2, 99942
`U55`	Golden Ears Obs., 2 in MPEC 2020-Y101 -- 53435, 159402
`U68`	JPL SynTrack Robotic Telescope, 1 in MPEC 2020-Y101 -- 2020 WZ1
`1861`	program code 1 via Kitab Obs., 2 in MPEC 2020-Y101 -- 19764, 887
`695^`	Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2020-Y101 -- 2020 XV4, 2020 XE2
`304`	Las Campanas Obs. in Chile, 1 in MPEC 2020-Y105 -- 2016 AU192
`V39`	LCO McDonald Obs. B in Texas, 1 in MPEC 2020-Y101 -- 2020 YL2
`Q64`	LCO Siding Spring B in New South Wales, 1 in MPEC 2020-Y101 -- 2020 YR2
`K38`	M57 Obs. in Italy, 1 in MPEC 2020-Y99 -- 2020 YY2
`118`	Modra Obs. in Slovakia, 1 in MPEC 2020-Y101 -- 1998 KY26
`V01`	Mountainville Obs. in Utah, 1 in MPEC 2020-Y99 -- 2020 YY2
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 31 in MPECs 2020-Y98, 2020-Y100, 2020-Y101, 2020-Y103, 2020-Y104 & 2020-Y106 -- N00hp15, 2020 YZ2, 2020 YG3, 2020 YC3, 2020 YB3, 2020 XK3, 2020 XC7, 2020 XA4, 2020 WD1, 2020 UV1, 2020 TT7, 2020 KK26, 2017 SV20, 2015 AS45, 2010 VU198, 2003 BK47, 1999 VX15, 99942, 523633, 506459, 482228, 481918, 452307, 415987, 40263, 347813, 333578, 199145, 189040, 141079, 11398
`C51`	NEOWISE in Earth polar orbit, 2 in MPECs 2020-Y98 & 2020-Y101 -- N00hp15, 99942
`557`	Ondrejov Obs. in the Czech Republic, 1 in MPEC 2020-Y101 -- 1998 KY26
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 27 in MPECs 2020-Y98, 2020-Y101, 2020-Y103 & 2020-Y106 -- N00hp15, 2020 YG3, 2020 YB3, 2020 UV1, 2020 RO9, 2020 HF1, 2018 GE4, 2016 EE156, 2016 BN1, 2015 TW144, 2015 BW510, 2012 UM68, 2011 WL2, 2010 VQ21, 2010 VJ, 99942, 511520, 470864, 417581, 380929, 38091, 224926, 190758, 154330, 154144, 152978, 8567
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 13 in MPECs 2020-Y98 & 2020-Y101 -- N00hp15, 2020 YT2, 2020 WH2, 2019 AN5, 2016 CB32, 2011 GD60, 99942, 506459, 457768, 40263, 373579, 313809, 159923
`L07`	Salvatore di Giacomo Obs., 1 in MPEC 2020-Y99 -- 2020 YY2
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y101 -- 27031
`691`	Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2020-Y98 & 2020-Y101 -- N00hp15, 2020 WJ4, 2020 ST1, 2020 PD1, 2017 AF5, 2016 PO39, 2015 LK21, 2014 AC16, 99942
`291`	Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2020-Y101 -- 2020 YS2, 2020 YR2, 2020 YL1, 2020 XV, 2020 XU6, 2020 VZ5, 2019 AP6, 2013 FK
`W34`	Squirrel Valley Obs. in North Carolina, 1 in MPEC 2020-Y99 -- 2020 YY2
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 23 in MPECs 2020-Y98, 2020-Y99, 2020-Y100, 2020-Y101, 2020-Y102, 2020-Y103 & 2020-Y106 -- N00hp15, 2020 YZ2, 2020 YY2, 2020 YV1, 2020 YQ1, 2020 YP1, 2020 YP, 2020 YO1, 2020 YJ, 2020 YG3, 2020 YB3, 2020 YA3, 2020 YA1, 2020 XY, 2020 XT4, 2020 XK, 2020 XF3, 2020 XC4, 2020 WM3, 2020 WC5, 2020 WA5, 2020 VM3, 99942
`858`	Tebbutt Obs. in New Mexico, 3 in MPECs 2020-Y99, 2020-Y100 & 2020-Y106 -- 2020 YZ2, 2020 YY2, 2020 YG3
`W33`	Transit Dreams Obs., 1 in MPEC 2020-Y99 -- 2020 YY2
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y105 -- 2016 AU192
`T14`	UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2020-Y105 -- 2016 AU192

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

Impact Risk Monitoring on 23 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 YC3	NEODyS	2358	2025-2120	96	1.2e-07	-4.45	-5.19	n/a	NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2020-12-21.273 to 2020-12-23.285."
2020 YC3	JPL Sentry	1700	2025-2120	88	1.607589e-07	-4.06	-4.76	0	JPL: Computed at 07:40 today Pacific time based on 21 observations spanning 2.0123 days (2020-Dec-21.271836 to 2020-Dec-23.2841). Diameter approximately 0.329 km. from weighted mean H=20.07.

2020 YA3	NEODyS	2358	2049-2119	25	1.79e-05	-5.26	-5.35	0	NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2020-12-21.357 to 2020-12-23.369."
2020 YA3	JPL Sentry	1700	2049-2119	14	1.7400227e-05	-5.24	-5.38	0	JPL: Computed at 07:31 today Pacific time based on 25 observations spanning 2.0126 days (2020-Dec-21.355978 to 2020-Dec-23.368612). Diameter approximately 0.022 km. from weighted mean H=25.95.

2020 YS2	NEODyS	2358	2093-2120	3	1.83e-06	-9.04	-9.05	n/a	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2020-12-21.460 to 2020-12-23.307."
2020 YS2	JPL Sentry	1700	2093-2093	1	4.996e-07	-9.59	-9.59	0	JPL: Computed at 07:06 today Pacific time based on 18 observations spanning 1.8466 days (2020-Dec-21.459571 to 2020-Dec-23.30613). Diameter approximately 0.002 km. from weighted mean H=30.99.

2020 YR2	NEODyS	2358	R E M O V E D						-
2020 YR2	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1504 UTC today

2020 YG2	NEODyS	2358	2067-2109	5	6.03e-07	-6.31	-6.53	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2020-12-20.194 to 2020-12-22.158."
2020 YG2	JPL Sentry	1700	2067-2109	5	3.84022e-07	-6.50	-6.59	0	JPL: Computed at 06:30 today Pacific time based on 33 observations spanning 1.9643 days (2020-Dec-20.19277 to 2020-Dec-22.157113). Diameter approximately 0.040 km. from weighted mean H=24.62.

2020 YM1	JPL Sentry	1700	2091-2119	18	7.399411e-05	-6.80	-7.16	0	JPL: Computed at 06:56 Dec. 21st 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	2358	2033-2119	22	1.01e-07	-4.33	-4.57	0	NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2020-12-19.376 to 2020-12-22.502."
2020 YL1	JPL Sentry	1700	2033-2116	20	1.830331e-07	-4.06	-4.51	0	JPL: Computed at 06:32 today Pacific time based on 34 observations spanning 3.1255 days (2020-Dec-19.375273 to 2020-Dec-22.50077). Diameter approximately 0.260 km. from weighted mean H=20.58.

2020 YA1	NEODyS	2358	2093-2118	14	5.73e-06	-6.56	-6.73	0	NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2020-12-17.405 to 2020-12-23.454."
2020 YA1	JPL Sentry	1700	2088-2113	6	5.09422e-06	-6.61	-6.75	0	JPL: Computed at 07:10 today Pacific time based on 45 observations spanning 6.0487 days (2020-Dec-17.404234 to 2020-Dec-23.452959). Diameter approximately 0.015 km. from weighted mean H=26.73.

2020 XU6	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1501 UTC today

2020 XF	JPL Sentry	1700	2056-2120	135	0.0003671175	-4.53	-5.02	0	JPL: Computed at 06:55 today Pacific time based on 93 observations spanning 18.767 days (2020-Dec-04.32683 to 2020-Dec-23.09403). Diameter approximately 0.015 km. from weighted mean H=26.70.

2008 XK	JPL Sentry	1700	2021-2101	86	4.053938e-07	-6.65	-6.82	0	JPL: Computed at 09:53 Dec. 18th of 2019 Pacific time based on 12 observations spanning .08663 days (2008-Dec-02.28019 to 2008-Dec-02.36682). Diameter approximately 0.012 km. from weighted mean H=27.23.

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 23 December '20

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

2358	Noted that NEODyS has updated its 2020 YA1 risk assessment - see above Noted that NEODyS has posted 2020 YA3 as an impact risk - see above Noted that NEODyS has posted 2020 YC3 as an impact risk - see above Noted that NEODyS has updated its 2020 YG2 risk assessment - see above Noted that NEODyS has updated its 2020 YL1 risk assessment - see above Noted that NEODyS has removed 2020 YR2 as an impact risk - see above Noted that NEODyS has updated its 2020 YS2 risk assessment - see above
1915	Grabbed MPEC 2020-Y106 - 2020 YG3 - see above
1700	Noted that JPL Sentry has updated its 2008 XK risk assessment - see above Noted that JPL Sentry has updated its 2020 XF risk assessment - see above Noted that JPL Sentry has removed 2020 XU6 as an impact risk - see above Noted that JPL Sentry has updated its 2020 YA1 risk assessment - see above Noted that JPL Sentry has posted 2020 YA3 as an impact risk - see above Noted that JPL Sentry has posted 2020 YC3 as an impact risk - see above Noted that JPL Sentry has updated its 2020 YG2 risk assessment - see above Noted that JPL Sentry has updated its 2020 YL1 risk assessment - see above Noted that JPL Sentry has updated its 2020 YM1 risk assessment - see above Noted that JPL Sentry has removed 2020 YR2 as an impact risk - see above Noted that JPL Sentry has updated its 2020 YS2 risk assessment - see above Grabbed MPEC 2020-Y101 - Daily Orbit Update - see above Grabbed MPEC 2020-Y102 - 2020 YA3 - see above Grabbed MPEC 2020-Y103 - 2020 YB3 - see above Grabbed MPEC 2020-Y104 - 2020 YC3 - see above Grabbed MPEC 2020-Y105 - 2016 AU192 - see above
0530	Grabbed MPEC 2020-Y98 - IAWN Planetary Defense Exercise: Apophis - see above Grabbed MPEC 2020-Y99 - 2020 YY2 - see above Grabbed MPEC 2020-Y100 - 2020 YZ2 - see above

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