2020-12-13 Tracking News

Contents on 13 December '20

IAU Minor Planet Center
- NEOCP Activity -- 63 listings
- New MPECs -- twelve MPECs
Observers -- 36 observers
Impact Risk Monitoring -- eight objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1234 risk-listed objects, 157 have had news in the last 31 days. Updated at 1732 UTC on 13 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 13 December '20

The MPC's NEO Confirmation Page has 63 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 63 objects listed. Of these, 30 were "one nighters." So far The Tracking News has counted a total of 85 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 13 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-X141 time-stamped "04:28 UT" - 2020 XE4 - see below
MPEC 2020-X142 time-stamped "04:30 UT" - 2020 XF4 - see below
MPEC 2020-X143 time-stamped "04:32 UT" - 2020 XG4 - see below
MPEC 2020-X144 time-stamped "04:33 UT" - 2020 XH4 - see below
MPEC 2020-X145 time-stamped "12:23 UT" - Daily Orbit Update - see below
MPEC 2020-X146 time-stamped "15:00 UT" - 2018 YG - see below
MPEC 2020-X147 time-stamped "15:01 UT" - 2020 XR - see below
MPEC 2020-X148 time-stamped "18:54 UT" - 2020 XJ4 - see below
MPEC 2020-X149 time-stamped "22:15 UT" - 2020 KK26 - see below
MPEC 2020-X150 time-stamped "22:18 UT" - 2020 XR4 - see below
MPEC 2020-X151 time-stamped "22:19 UT" - 2020 XS4 - see below
MPEC 2020-X152 time-stamped "22:21 UT" - 2020 XT4

MPEC 2020-X152 - "22:21 UT" - 2020 XT4

K20X04T 2020 XT4 (H=21.1 ~204m) was picked up at 1349 UT on 11 Dec. by Pan-STARRS 2 (PS2), observing it at Dec. 8.45-48p4 and 11.58-60p3. This detection was confirmed by the Spacewatch 0.9m telescope (Dec. 12.28-29p3), Steward Obs. Mt. Lemmon Station (Dec. 12.31-32p4), Pan-STARRS 1 (PS1) (Dec. 12.43-47p4), and Visnjan Obs. (Dec. 13.05p3).

MPEC 2020-X151 - "22:19 UT" - 2020 XS4

K20X04S 2020 XS4 (small asteroid, H=27.1 ~13m) was picked up at 0632 UT on 10 Dec. by PS1, observing it at Nov. 17.44-48p4 at G=22.21-85, Dec. 10.27-31p3 at w=21.97-22.28, and 11.31p1 at G=21.90. This detection was confirmed by Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 13.07-08p3).

MPEC 2020-X150 - "22:18 UT" - 2020 XR4

K20X04R 2020 XR4 (small asteroid, H=22.3 ~117m) was picked up at 0601 UT on 8 Dec. by PS1, observing it at Nov. 19.41-44p4 at G=21.45-80 and Dec. 8.25-28p3 at w=22.31-73. This detection was confirmed by PS2 (Nov. 14.37-40p3 at G=21.42-22.61), Holmes/CTIO (Dec. 9.10-12p3 at G=22.5-6 & 10.06-08p3 at G=22.3-6), and Astronomical Research Obs. Westfield (Dec. 10.08-09p3 at V=22.4-6).

MPEC 2020-X149 - "22:15 UT" - 2020 KK26

K20K26K 2020 KK26 (H=19.3 ~467m) was picked up at 1402 UT on 25 May by Mauna Kea, observing it at May 25.58-61p4 at r=22.1-2. This detection was confirmed by PS1 (Nov. 16.46-49p4 at G=22.03-52 & Dec. 10.44-47p4 at w=21.86-22.22), Holmes/CTIO (Dec. 11.20-21p4 & 13.16-18p3), and ARO Westfield (Dec. 11.23-25p2).

MPEC 2020-X148 - "18:54 UT" - 2020 XJ4

K20X04J 2020 XJ4 (small asteroid, H=24.7 ~39m) was picked up at 0620 UT on 9 Dec. by PS1, observing it at Dec. 9.26-30p4 at w=21.79-22.29. This detection was confirmed by ARO Westfield (Dec. 10.06p2 at V=22.0-22.4), UH/Tholen NEO Follow-Up 2.24m Telescope (Dec. 10.21p2 at G=22.06-11), the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 13.08-09p4 at G=21.42-22.04), and Visnjan Obs. (Dec. 13.74-76p3).

MPEC 2020-X147 - "15:01 UT" - 2020 XR

K20X00R 2020 XR (risk listed, Q=4.026 AU, Earth MOID=0.1 LD, H=19.8 ~371m) from PS1 (2013 March 3.24-25p4 at G=20.99-22.40, 2016 June 5.51-55p3 at G=22.96-24.05, June 14.45-47p3 at G=22.59-23.95, 22.49-52p3 at G=23.03-23, July 18.36-40p4 at G=21.75-90 & Nov. 28.24p2 at G=20.51-64) and PS2 (July 20.40-42p3 at G=21.83-22.04)

MPEC 2020-X146 - "15:00 UT" - 2018 YG

K18Y00G 2018 YG (small asteroid, H=24.3 ~47m) from program code 2 via ESA Optical Ground Station (ESA OGS) (Dec. 12.16p1 & 12.99-00p2)

<< DOU on 13 December '20 >> MPEC 2020-X145 - "12:23 UT" - Daily Orbit Update

Observations of risk-listed objects
K20X00R 2020 XR (Q=4.034 AU, arc=9 days, H=19.7 ~389m) from ESA OGS/code 2 (Dec. 12.84p1)
K20W05G 2020 WG5 (small asteroid, arc=14 days, H=27.7 ~10m, close passer, NHATS target) from ESA OGS/code 2 (Dec. 11.16-19p2)
Observations of recently (no longer) risk-listed objects
K20X00Z 2020 XZ (small asteroid, arc=7 days, H=26.0 ~21m) from the Spacewatch 1.8m telescope (Dec. 12.48-49p3)
Observations of close-passing objects
K20X04C 2020 XC4 (arc=4 days, H=26.0 ~21m, NHATS target) from PS2 (Dec. 10.22-25p4)
K20X01H 2020 XH1 (arc=6 days, H=22.9 ~89m) from ATLAS Haleakala (Dec. 12.46-48p3)
K20X00O 2020 XO (arc=7 days, H=23.9 ~56m) from Great Shefford Obs. (Dec. 12.75p4 & 12.89p4)
K20X00N 2020 XN (arc=8 days, H=24.6 ~41m) from Great Shefford Obs. (Dec. 12.77p4 & 12.87p3) and Steward Mt. Lemmon Sta. (Dec. 13.06p4)
K20X00H 2020 XH (arc=9 days, H=24.6 ~41m) from GINOP-KHK (Dec. 13.15p3)
K20R02K 2020 RK2 (arc=93 days, H=24.4 ~45m) from the Bok Telescope (Dec. 12.44-46p4 at G=22.7-23.6)
K20O05K 2020 OK5 (arc=153 days, H=25.4 ~28m, NHATS target) from GINOP-KHK (Dec. 13.17p3)
Observation campaigns (NHATS targets, radar support)
K20X02T 2020 XT2 (arc=17 days, H=24.7 ~39m, NHATS) from the Mt. Lemmon Survey (MLS) (Dec. 12.33-34p4) and PS1 (Dec. 12.39-41p3)
K20X02A 2020 XA2 (arc=7 days, H=25.0 ~34m, NHATS) from CSS-Kuiper (Dec. 13.13-14p3 at G=21.25-22.88)
K20R02V 2020 RV2 (arc=92 days, H=25.5 ~27m, NHATS) from Holmes/CTIO (Dec. 11.26-29p4 at G=23.0-1)
K13Y02S 2013 YS2 (arc=2 opp, H=23.5 ~68m, NHATS) from ATLAS Haleakala (Dec. 12.42-44p7) and Farra d'Isonzo Obs. (Dec. 12.85p1 & 12.89-91p2)
11398 11398 1998 YP11 (radar) from the Zwicky Transient Facility (ZTF) (Dec. 12.19p1 & 12.25-26p3)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20X04E 2020 XE4 (arc=2 days, H=25.4 ~28m) from Golden Ears Obs. (Dec. 13.15-16p3)
K20X03N 2020 XN3 (arc=7 days, H=22.9 ~89m) from PS1 (Dec. 12.31-36p3)
K20X02Q 2020 XQ2 (i=41.7°, arc=4 days, H=22.7 ~98m) from Great Shefford Obs. (Dec. 12.77-78p4)
K20X02N 2020 XN2 (arc=5 days, H=23.4 ~71m) from ATLAS Haleakala (Dec. 12.40-43p4), Paus Obs. (Dec. 12.77-78p3), and North Obs. (Dec. 12.80-81p3)
K20X00U 2020 XU (arc=7 days, H=23.0 ~85m) from Bok Tel. (Dec. 12.35-36p4) and Paus Obs. (Dec. 12.83p2)
K20X00D 2020 XD (arc=34 days, H=25.6 ~26m) from Steward Mt. Lemmon Sta. (Dec. 12.50p4)
K20W03J 2020 WJ3 (i=48.8°, arc=5 days, H=23.2 ~78m) from JPL SynTrack Robotic Telescope (Nov. 23.22-23p4)
K20V07C 2020 VC7 (arc=38 days, H=23.9 ~56m) from PS2 (Dec. 12.38-40p3), Paus Obs. (Dec. 12.79-81p3), and Farra d'Isonzo Obs. (Dec. 12.80-82p4)
K20V03Q 2020 VQ3 (arc=32 days, H=22.9 ~89m) from PS2 (Dec. 12.31-35p3)
K20U02N 2020 UN2 (arc=57 days, H=22.5 ~107m) from PS2 (Dec. 12.39-41p3)
K20T03G 2020 TG3 (Q=4.608 AU, arc=67 days, H=22.5 ~107m) from MLS (Dec. 12.42-43p3)
K20P07K 2020 PK7 (arc=145 days, H=23.2 ~78m) from PS2 (Dec. 12.37-41p7)
K10C55A 2010 CA55 (i=54.6°, arc=17 days, H=22.2 ~123m) from Tholen 2.24m (2010 Feb. 21.22p1 at G=23.84)
K09X08L 2009 XL8 (arc=2 opp, H=22.5 ~107m) from Visnjan Obs. (Dec. 12.74-75p5)
K20T04M 2020 TM4 (Q=4.139 AU, arc=61 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 12.55p3)
K16Y00M 2016 YM (arc=3 opp, H=22.0 ~135m) from ATLAS Haleakala (Dec. 12.47-49p7) and North Obs. (Dec. 12.83-84p4)
Observations of other objects
K20X03L 2020 XL3 (arc=3 days, H=21.2 ~195m) from program code "!" (10) via ESA Optical Ground Station (ESA OGS) (Dec. 12.20p3) and PS2 (Dec. 12.52-55p2)
K20X01N 2020 XN1 (i=36.8°, Q=4.001 AU, arc=24 days, H=19.6 ~407m) from JPL SynTrack (Dec. 11.20-21p2, 11.28-29p2 & 11.36-37p4) and ATLAS Haleakala (Dec. 12.45-47p4)
K20W05S 2020 WS5 (i=40.9°, Q=4.018 AU, arc=14 days, H=20.8 ~234m) from JPL SynTrack (Dec. 11.17-18p2 & 11.23-24p2)
K20W05R 2020 WR5 (arc=15 days, H=20.5 ~269m) from Holmes/CTIO (Dec. 11.31-32p2)
K20W05C 2020 WC5 (arc=17 days, H=20.1 ~323m) from PS2 (Dec. 12.51-55p7) and Steward Mt. Lemmon Sta. (Dec. 12.53p4)
K20W05A 2020 WA5 (arc=17 days, H=21.5 ~170m) from Steward Mt. Lemmon Sta. (Dec. 12.49-50p4)
K20W03M 2020 WM3 (i=40.4°, arc=22 days, H=18.5 ~676m) from Steward Mt. Lemmon Sta. (Dec. 12.53-54p4)
K20W02T 2020 WT2 (arc=22 days, H=21.1 ~204m) from PS1 (Dec. 12.61-64p3)
K20V06Q 2020 VQ6 (arc=27 days, H=21.2 ~195m) from ATLAS Haleakala (Dec. 12.42-44p4)
K20V03N 2020 VN3 (arc=32 days, H=20.2 ~309m) from Steward Mt. Lemmon Sta. (Dec. 12.55p3)
K20V03M 2020 VM3 (arc=32 days, H=20.8 ~234m) from Steward Mt. Lemmon Sta. (Dec. 12.53-54p4)
K20T04G 2020 TG4 (Q=4.171 AU, arc=84 days, H=20.1 ~323m) from ATLAS Haleakala (Dec. 12.44-46p4)
K20R09O 2020 RO9 (Q=4.238 AU, arc=89 days, H=18.4 ~708m) from Steward Mt. Lemmon Sta. (Dec. 12.53-54p4)
K20P05C 2020 PC5 (Q=4.177 AU, arc=117 days, H=18.5 ~676m) from NEOWISE (Dec. 8.15p1, 8.28p1, 8.41p1, 8.54p1, 8.67p1, 8.74p1, 8.80p1, 9.19p2, 9.26p1, 9.32p1, 9.45p1, 9.59p1, 9.65p1 & 9.78p1)
K20O08C 2020 OC8 (arc=180 days, H=20.8 ~234m) from the Catalina Sky Survey (CSS) (Dec. 12.31-32p3)
K20O07S 2020 OS7 (Q=4.461 AU, arc=148 days, H=20.3 ~295m) from PS2 (Dec. 12.21-25p4)
K20M05E 2020 ME5 (arc=2 opp, H=20.4 ~282m) from PS1 (Dec. 12.27-30p4)
K19Y06R 2019 YR6 (arc=2 opp, H=21.1 ~204m) from Bok Tel. (Dec. 12.46-47p4 at G=22.2-23.3)
K19A05N 2019 AN5 (arc=5 opp, H=21.1 ~204m) from Bok Tel. (Dec. 12.46-48p4)
K18T05S 2018 TS5 (arc=4 opp, H=21.4 ~178m) from PS1 (Dec. 12.31-35p3)
K18K02M 2018 KM2 (arc=3 opp, H=20.3 ~295m) from ATLAS Haleakala (Dec. 12.54-58p7)
K17E02S 2017 ES2 (arc=4 opp, H=19.4 ~446m) from Bok Tel. (Dec. 12.35-37p4 at G=21.5-22.5)
K16V05R 2016 VR5 (arc=3 opp, H=19.0 ~537m) from PS1 (Dec. 12.54-57p4)
K16T93F 2016 TF93 (arc=4 opp, H=17.9 ~891m) from PS2 (Dec. 12.27-29p3)
K16EF6E 2016 EE156 (Q=4.660 AU, arc=4 opp, H=17.9 ~891m) from MLS (Dec. 12.39-41p4)
K15KC1X 2015 KX121 (arc=4 opp, H=21.3 ~186m) from MLS (Dec. 12.43-45p4)
K15B04F 2015 BF4 (arc=6 opp, H=20.5 ~269m) from ATLAS Haleakala (Dec. 12.46-50p4)
K14J57H 2014 JH57 (Q=6.247 AU, arc=5 opp, H=16.2 ~1.95 km) from ZTF (Dec. 12.55-57p4)
K13U14X 2013 UX14 (arc=4 opp, H=18.3 ~741m) from Althuraya Astronomy Ctr. (Nov. 24.76-80p4) and ATLAS Haleakala (Dec. 12.43-45p4)
K13P06Y 2013 PY6 (arc=4 opp, H=19.4 ~446m) from ATLAS Haleakala (Dec. 12.46-50p4)
K13P06V 2013 PV6 (arc=6 opp, H=19.2 ~490m) from Pleasant Groves Obs. (Dec. 11.20-23p3)
K11W02L 2011 WL2 (arc=6 opp, H=20.8 ~234m) from MLS (Dec. 12.39-41p4)
K03Y01M 2003 YM1 (arc=3 opp, H=18.1 ~812m) from ATLAS Haleakala (Dec. 12.51-52p4)
K03Y00J 2003 YJ (arc=4 opp, H=20.3 ~295m) from CSS (Dec. 12.32-34p4) and ATLAS Mauna Loa (Dec. 12.39-41p4)
K03X00M 2003 XM (Q=5.375 AU, arc=3 opp, H=19.0 ~537m) from PS1 (Dec. 12.32-36p4)
K03B47K 2003 BK47 (Q=4.689 AU, arc=5 opp, H=17.8 ~933m) from CSS (Dec. 12.43-44p4) and ATLAS Mauna Loa (Dec. 12.56-57p4)
K02T67S 2002 TS67 (arc=6 opp, H=19.1 ~513m) from ATLAS Haleakala (Dec. 12.49-51p4)
K02L03G 2002 LG3 (Q=4.124 AU, arc=3 opp, H=19.8 ~371m) from CSS (Dec. 12.43-44p4)
J99H01V 1999 HV1 (arc=7 opp, H=17.5 ~1.07 km) from ZTF (Dec. 10.27p1, 10.32p1, 12.22p1 & 12.28p1)
J97X10E 1997 XE10 from program code 1 via Schwarzschild Obs. (Dec. 8.69p2)
J96B01A 1996 BA1 (arc=3 opp, H=20.2 ~309m) from PS1 (Dec. 12.32-36p3)
r0938 530938 2011 XE from ATLAS Mauna Loa (Dec. 12.29-31p4)
q3824 523824 2016 RO1 from CSS (Dec. 12.49-51p4)
p3125 513125 1997 GC32 from ATLAS Haleakala (Dec. 12.45-47p4)
o6779 506779 2006 YY2 from PS2 (Dec. 12.43-46p3)
o6459 506459 2002 AL14 from CSS (Dec. 12.45-47p4)
o5093 505093 2011 VQ5 from ZTF (Dec. 10.27p1, 10.35-39p2 & 10.49p2)
o0080 500080 2011 WV134 from PS2 (Dec. 12.31-35p4)
m0824 480824 1999 JO6 from ZTF (Dec. 12.21-24p2)
l4554 474554 2003 YQ94 from Castelmartini Obs. (Nov. 23.74p2) and ATLAS Haleakala (Dec. 12.31-34p4)
j0259 450259 2003 WQ7 from NEOWISE (Dec. 8.31p1, 8.44p1, 8.57p1, 8.70p1, 8.83p1, 8.90p1, 8.96p1 & 9.03p1)
i9107 449107 2012 VJ82 from CSS (Dec. 12.43-44p4)
h8902 438902 2009 WF104 from ATLAS Haleakala (Dec. 12.55-58p4)
g0262 420262 2011 KD11 from PS1 (Dec. 12.33-36p3)
g0048 420048 2011 DL19 from Pleasant Groves Obs. (Dec. 10.99-03p3)
f8797 418797 2008 VF from NEOWISE (Dec. 9.59p1, 9.72p1, 9.85p1, 9.92p1, 9.98p1, 10.05p1, 10.11p1, 10.18p1, 10.31p1, 10.44p2 & 10.57p1)
f8416 418416 2008 LV16 from PS2 (Dec. 12.47-50p4)
f6694 416694 2004 YR32 from ATLAS Haleakala (Dec. 12.52-53p4)
f5029 415029 2011 UL21 from ATLAS Haleakala (Dec. 12.47-50p8)
f4903 414903 2010 XT45 from PS2 (Dec. 12.32-35p2)
f4586 414586 2009 UV18 from ZTF (Dec. 12.19-25p4)
c0524 380524 2004 GY from PS1 (Dec. 12.32-35p3 at w=21.8-22.1)
c0321 380321 2002 HF8 from PS1 (Dec. 12.42-47p4)
a7390 367390 2008 MB5 from Bok Tel. (Dec. 12.53-54p4)
a1532 361532 2007 HF44 from PS2 (Dec. 12.61-65p4)
Z1370 351370 2005 EY from PS1 (Dec. 12.49-51p3)
Y5705 345705 2006 VB14 from ZTF (Dec. 12.11-13p4) and ATLAS Haleakala (Dec. 12.28-31p4)
W2775 322775 2001 HA8 from Bok Tel. (Dec. 12.38-39p4)
U7493 307493 2002 XP90 from ATLAS Haleakala (Dec. 12.64-66p4)
R5714 275714 2000 YH4 from CSS (Dec. 12.25-27p4) and ATLAS Mauna Loa (Dec. 12.32-34p4)
R5611 275611 1999 XX262 from PS2 (Dec. 12.61-65p4)
O6138 246138 2007 OG3 from Bok Tel. (Dec. 12.46-48p4)
O1662 241662 2000 KO44 from ATLAS Mauna Loa (Dec. 12.51-55p4)
M3456 223456 2003 UB10 from PS2 (Dec. 12.61-65p6)
K2411 202411 2005 RC from CSS (Dec. 12.40-42p4)
J4126 194126 2001 SG276 from PS1 (Dec. 12.31-36p4)
J0208 190208 2006 AQ from NEOWISE (Dec. 7.20p1), ZTF (Dec. 12.49-53p4), and ATLAS Haleakala (Dec. 12.62-63p4)
I6822 186822 2004 FE31 from CSS (Dec. 12.23-25p2), ATLAS Mauna Loa (Dec. 12.32-34p4), and Geyserland Obs. (Dec. 12.48-49p4)
H1819 171819 2001 FZ6 from PS2 (Dec. 12.56-60p4)
G3902 163902 2003 SW222 from Golden Ears Obs. (Dec. 13.05-06p3)
G3364 163364 2002 OD20 from ATLAS Haleakala (Dec. 12.35-37p4)
G3243 163243 2002 FB3 from ZTF (Dec. 12.56-57p4)
G3132 163132 2002 CU11 from MLS (Dec. 12.53-55p4)
G2781 162781 2000 XL44 from ZTF (Dec. 12.49-53p3)
G2186 162186 1999 OP3 from ATLAS Haleakala (Dec. 12.53-56p4)
G2173 162173 Ryugu (1999 JU3) from Southern Utsunomiya (Dec. 9.39-40p4) and Shinshiro Obs. (Dec. 11.45-46p3)
F9856 159856 2004 JW6 from ZTF (Dec. 10.28-32p2 & 12.23-26p3)
F4347 154347 2002 XK4 from Bok Tel. (Dec. 12.53-54p4) and PS2 (Dec. 12.61-65p4)
F4330 154330 2002 VX94 from Golden Ears Obs. (Dec. 13.09-10p3)
F4302 154302 2002 UQ3 from ATLAS Mauna Loa (Dec. 12.26-29p4)
F3201 153201 2000 WO107 from ATLAS Haleakala (Dec. 12.37-39p4)
F2941 152941 2000 FM10 from ATLAS Haleakala (Dec. 12.64-66p4)
E4411 144411 2004 EW9 from ATLAS Haleakala (Dec. 12.35-37p4)
E3992 143992 2004 AF from PS2 (Dec. 12.61-64p4)
E3678 143678 2003 SA224 from MLS (Dec. 12.51-53p4)
E3649 143649 2003 QQ47 from ZTF (Dec. 12.56p1)
E2464 142464 2002 TC9 from MLS (Dec. 12.45-47p4)
E2348 142348 2002 RX211 from PS2 (Dec. 12.62-65p3)
D8971 138971 2001 CB21 from MLS (Dec. 12.50-51p4)
D8947 138947 2001 BA40 from ATLAS Haleakala (Dec. 12.47-49p7)
D8852 138852 2000 WN10 from MLS (Dec. 12.07-08p4)
D8175 138175 2000 EE104 from GINOP-KHK (Dec. 13.15p3)
D8095 138095 2000 DK79 from ATLAS Mauna Loa (Dec. 12.24-26p4)
D7924 137924 2000 BD19 from ZTF (Dec. 11.55-57p5)
D6773 136773 1996 TR6 from PS1 (Dec. 12.40-41p2)
A8519 108519 2001 LF from PS2 (Dec. 12.47-50p4)
99935 99935 2002 AV4 from ATLAS Haleakala (Dec. 12.60-63p4)
99799 99799 2002 LJ3 from PS2 (Dec. 12.61-64p4)
98943 98943 2001 CC21 from PS2 (Dec. 12.61-64p3)
96744 96744 1999 OW3 from PS1 (Dec. 12.26-29p4)
89355 89355 2001 VS78 from PS2 (Dec. 12.47-49p3) and ATLAS Haleakala (Dec. 12.53-58p4)
88264 88264 2001 KN20 from ZTF (Dec. 10.21p1, 10.26p1, 10.32p1 & 12.19-26p4)
87684 87684 2000 SY2 from ATLAS Mauna Loa (Dec. 12.26-29p4)
87024 87024 2000 JS66 from PS1 (Dec. 12.62-64p3)
86450 86450 2000 CK33 from ATLAS Mauna Loa (Dec. 12.60-62p7)
85275 85275 1994 LY from CSS (Dec. 12.30-31p3) and ATLAS Mauna Loa (Dec. 12.35-37p7)
68359 68359 2001 OZ13 from ZTF (Dec. 12.18-24p7)
68346 68346 2001 KZ66 from PS1 (Dec. 12.60-64p3)
66272 66272 1999 JW6 from Golden Ears Obs. (Dec. 13.08p3)
65717 65717 1993 BX3 from CSS (Dec. 12.28-29p4), ATLAS Mauna Loa (Dec. 12.33-35p4), and Geyserland Obs. (Dec. 12.46-48p4)
52761 52761 1998 MN14 from PS1 (Dec. 12.54-55p3)
40263 40263 1999 FQ5 from PS1 (Dec. 12.61-63p3)
36183 36183 1999 TX16 from ATLAS Mauna Loa (Dec. 12.23-26p4)
35107 35107 1991 VH from ATLAS Mauna Loa (Dec. 12.22-25p4)
33342 33342 1998 WT24 from MLS (Dec. 12.54-55p4)
31669 31669 1999 JT6 from ZTF (Dec. 12.55-57p5)
27031 27031 1998 RO4 from PS2 (Dec. 12.31-34p4)
25916 25916 2001 CP44 from PS2 (Dec. 12.52-56p4)
24445 24445 2000 PM8 from ZTF (Dec. 12.55-56p2)
23183 23183 2000 OY21 from ATLAS Haleakala (Dec. 12.64-66p4)
21088 21088 Chelyabinsk (1992 BL2) from ATLAS Haleakala (Dec. 12.52-53p4) and PS2 (Dec. 12.53-56p3)
20236 20236 1998 BZ7 from Bok Tel. (Dec. 12.38-40p4)
19764 19764 2000 NF5 from PS1 (Dec. 12.21-24p3)
16912 16912 Rhiannon (1998 EP8) from MLS (Dec. 12.45-47p4)
16834 16834 1997 WU22 from ATLAS Haleakala (Dec. 12.35-38p4)
11405 11405 1999 CV3 from ATLAS Mauna Loa (Dec. 12.23-26p4)
10860 10860 1995 LE from SATINO-1 (Aug. 21.11-14p3)
10150 10150 1994 PN from PS1 (Dec. 12.54-57p4)
10115 10115 1992 SK from ATLAS Haleakala (Dec. 12.33-35p4)
08566 8566 1996 EN from ATLAS Mauna Loa (Dec. 12.25-27p4)
08507 8507 1991 CB1 from PS1 (Dec. 12.49-51p3)
08037 8037 1993 HO1 from ATLAS Haleakala (Dec. 12.63-65p4)
07977 7977 1977 QQ5 from ATLAS Mauna Loa (Dec. 12.22-24p4)
07822 7822 1991 CS from MLS (Dec. 12.54-55p3)
07753 7753 1988 XB from ATLAS Haleakala (Dec. 12.50-54p3)
07350 7350 1993 VA from ZTF (Dec. 11.55p1 & 12.55-57p3)
06053 6053 1993 BW3 from ATLAS Haleakala (Dec. 12.23-25p4)
05879 5879 Almeria (1992 CH1) from ATLAS Mauna Loa (Dec. 12.55-57p4)
05863 5863 Tara (1983 RB) from PS2 (Dec. 12.42-45p4)
05836 5836 1993 MF from ZTF (Dec. 12.33p2) and ATLAS Haleakala (Dec. 12.42-44p7)
05645 5645 1990 SP from program code 1 via Kitab Obs. (Oct. 15.97-99p5)
05131 5131 1990 BG from ATLAS Haleakala (Dec. 12.64-66p4)
04953 4953 1990 MU from ATLAS Mauna Loa (Dec. 12.25-27p4)
04688 4688 1980 WF from PS1 (Dec. 12.21-24p4)
04503 4503 Cleobulus (1989 WM) from Golden Ears Obs. (Dec. 13.12-13p3)
04055 4055 Magellan (1985 DO2) from CSS (Dec. 12.31p1), ATLAS Mauna Loa (Dec. 12.35-37p4), and Geyserland Obs. (Dec. 12.50-51p4)
03671 3671 Dionysus (1984 KD) from ZTF (Dec. 10.21p1, 10.26p1, 10.32p1 & 12.19-26p4) and PS2 (Dec. 12.31-35p4)
03199 3199 Nefertiti (1982 RA) from CSS (Dec. 12.53-54p4)
03122 3122 Florence (1981 ET3) from CSS (Dec. 12.52-53p4)
02368 2368 Beltrovata (1977 RA) from ATLAS Haleakala (Dec. 12.45-46p3)
02329 2329 Orthos (1976 WA) from ZTF (Dec. 12.56p2)
02212 2212 Hephaistos (1978 SB) from ZTF (Dec. 10.19-22p2, 12.19p1 & 12.24p1), PS1 (Dec. 12.32-34p2), and ATLAS Haleakala (Dec. 12.33-36p4)
01943 1943 Anteros (1973 EC) from CSS (Dec. 12.52-53p4)
01863 1863 Antinous (1948 EA) from PS2 (Dec. 12.37-41p4)
01685 1685 Toro (1948 OA) from MASTER IAC Obs. (Dec. 12.26p2) and CSS (Dec. 12.54-55p4)
01036 1036 Ganymed (1924 TD) from ATLAS Mauna Loa (Dec. 12.48-49p4)

MPEC 2020-X144 - "04:33 UT" - 2020 XH4

K20X04H 2020 XH4 (small asteroid, H=23.1 ~81m) was picked up at 0937 UT on 10 Dec. by PS2, observing it at Dec. 10.40-43p3. This detection was confirmed by Holmes/CTIO (Dec. 11.26-27p3 & 12.21-22p3), Steward Mt. Lemmon Sta. (Dec. 12.24p4), and Visnjan Obs. (Dec. 12.87-91p3).

MPEC 2020-X143 - "04:32 UT" - 2020 XG4

K20X04G 2020 XG4 (small asteroid, H=23.0 ~85m) was picked up at 0839 UT on 10 Dec. by PS2, observing it at Dec. 10.36-39p4. This detection was confirmed by MLS (Dec. 6.40-42p3), Holmes/CTIO (Dec. 11.19-20p3, 12.09-10p3 & 13.08-09p3), and Visnjan Obs. (Dec. 12.83-85p3).

MPEC 2020-X142 - "04:30 UT" - 2020 XF4

K20X04F 2020 XF4 (risk listed, Earth MOID=0.2 LD, H=27.4 ~11m, close passer, NHATS target) was picked up at 0712 UT on 10 Dec. by ZTF, observing it at Dec. 10.30-34p4. This detection was confirmed by MLS (Dec. 5.44-45p3), JPL SynTrack (Dec. 11.28-30p4 & 11.34p2), Great Shefford Obs. (Dec. 12.93-94p4), Paus Obs. (Dec. 12.95-96p2), ESA OGS/code 2 (Dec. 12.97p3), Visnjan Obs. (Dec. 13.00p5), and GINOP-KHK (Dec. 13.04p3).

MPEC 2020-X141 - "04:28 UT" - 2020 XE4

K20X04E 2020 XE4 (small asteroid, H=25.5 ~27m) was picked up at 0913 UT on 11 Dec. by JPL SynTrack, observing it at Dec. 11.31p2 and 11.38-44p14. This detection was confirmed by GINOP-KHK (Dec. 12.90-92p3), Great Shefford Obs. (Dec. 12.91p3), Visnjan Obs. (Dec. 12.92-93p4), Farra d'Isonzo Obs. (Dec. 12.96-98p3), and Paus Obs. (Dec. 12.97p2).

Observers on 13 December '20

A total of 36 observers appear in today's MPECs.

Code	Observer / observatory
`M46`	Althuraya Astronomy Ctr., 1 in MPEC 2020-X145 -- 2013 UX14
`H21`	Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2020-X148, 2020-X149 & 2020-X150 -- 2020 XR4, 2020 XJ4, 2020 KK26
`T05`	ATLAS Haleakala in Hawaii, 40 in MPEC 2020-X145 -- 2020 XN2, 2020 XN1, 2020 XH1, 2020 VQ6, 2020 TG4, 2018 KM2, 2016 YM, 2015 BF4, 2013 YS2, 2013 UX14, 2013 PY6, 2003 YM1, 2002 TS67, 99935, 89355, 513125, 474554, 438902, 416694, 415029, 345705, 307493, 23183, 21088, 190208, 16834, 163364, 162186, 153201, 152941, 144411, 138947, 10115, 8037, 7753, 6053, 5836, 5131, 2368, 2212
`T08`	ATLAS Mauna Loa in Hawaii, 21 in MPEC 2020-X145 -- 2003 YJ, 2003 BK47, 87684, 86450, 85275, 65717, 530938, 36183, 35107, 275714, 241662, 186822, 154302, 138095, 11405, 8566, 7977, 5879, 4953, 4055, 1036
`V00`	Bok Telescope in Arizona, 10 in MPEC 2020-X145 -- 2020 XU, 2020 RK2, 2019 YR6, 2019 AN5, 2017 ES2, 367390, 322775, 246138, 20236, 154347
`160`	Castelmartini Obs. in Italy, 1 in MPEC 2020-X145 -- 474554
`703`	Catalina Sky Survey (CSS) in Arizona, 17 in MPEC 2020-X145 -- 2020 OC8, 2003 YJ, 2003 BK47, 2002 LG3, 85275, 65717, 523824, 506459, 449107, 275714, 202411, 186822, 4055, 3199, 3122, 1943, 1685
`V06`	Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2020-X145 & 2020-X148 -- 2020 XJ4, 2020 XA2
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2020-X143, 2020-X144, 2020-X145, 2020-X149, 2020-X150 & 2020-X151 -- 2020 XS4, 2020 XR4, 2020 XH4, 2020 XG4, 2020 WR5, 2020 RV2, 2020 KK26
`J04!`	program code "!" (10) via ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2020-X145 -- 2020 XL3
`J042`	program code 2 via ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2020-X142, 2020-X145 & 2020-X146 -- 2020 XR, 2020 XF4, 2020 WG5, 2018 YG
`595`	Farra d'Isonzo Obs. in Italy, 3 in MPECs 2020-X141 & 2020-X145 -- 2020 XE4, 2020 VC7, 2013 YS2
`E89`	Geyserland Obs. in New Zealand, 3 in MPEC 2020-X145 -- 65717, 186822, 4055
`K88`	GINOP-KHK in Hungary, 5 in MPECs 2020-X141, 2020-X142 & 2020-X145 -- 2020 XH, 2020 XF4, 2020 XE4, 2020 OK5, 138175
`U55`	Golden Ears Obs., 5 in MPEC 2020-X145 -- 2020 XE4, 66272, 163902, 154330, 4503
`J95`	Great Shefford Obs. in England, 5 in MPECs 2020-X141, 2020-X142 & 2020-X145 -- 2020 XQ2, 2020 XO, 2020 XN, 2020 XF4, 2020 XE4
`U68`	JPL SynTrack Robotic Telescope, 5 in MPECs 2020-X141, 2020-X142 & 2020-X145 -- 2020 XN1, 2020 XF4, 2020 XE4, 2020 WS5, 2020 WJ3
`1861`	program code 1 via Kitab Obs., 1 in MPEC 2020-X145 -- 5645
`Z22`	MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2020-X145 -- 1685
`568`	Mauna Kea in Hawaii, 1 in MPEC 2020-X149 -- 2020 KK26
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2020-X142, 2020-X143 & 2020-X145 -- 2020 XT2, 2020 XG4, 2020 XF4, 2020 TG3, 2016 EE156, 2015 KX121, 2011 WL2, 33342, 16912, 163132, 143678, 142464, 138971, 138852, 7822
`C51`	NEOWISE in Earth polar orbit, 4 in MPEC 2020-X145 -- 2020 PC5, 450259, 418797, 190208
`J69`	North Obs. in England, 2 in MPEC 2020-X145 -- 2020 XN2, 2016 YM
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 30 in MPECs 2020-X145, 2020-X147, 2020-X148, 2020-X149, 2020-X150, 2020-X151 & 2020-X152 -- 2020 XT4, 2020 XT2, 2020 XS4, 2020 XR4, 2020 XR, 2020 XN3, 2020 XJ4, 2020 WT2, 2020 ME5, 2020 KK26, 2018 TS5, 2016 VR5, 2003 XM, 1996 BA1, 96744, 87024, 68346, 52761, 420262, 40263, 380524, 380321, 351370, 19764, 194126, 136773, 10150, 8507, 4688, 2212
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 35 in MPECs 2020-X143, 2020-X144, 2020-X145, 2020-X147, 2020-X150 & 2020-X152 -- 2020 XT4, 2020 XR4, 2020 XR, 2020 XL3, 2020 XH4, 2020 XG4, 2020 XC4, 2020 WC5, 2020 VQ3, 2020 VC7, 2020 UN2, 2020 PK7, 2020 OS7, 2016 TF93, 99799, 98943, 89355, 506779, 500080, 418416, 414903, 361532, 275611, 27031, 25916, 223456, 21088, 171819, 154347, 143992, 142348, 108519, 5863, 3671, 1863
`B49`	Paus Obs. in Spain, 5 in MPECs 2020-X141, 2020-X142 & 2020-X145 -- 2020 XU, 2020 XN2, 2020 XF4, 2020 XE4, 2020 VC7
`W16`	Pleasant Groves Obs., 2 in MPEC 2020-X145 -- 2013 PV6, 420048
`C95`	SATINO-1 in France, 1 in MPEC 2020-X145 -- 10860
`0331`	program code 1 via Schwarzschild Obs. in Germany, 1 in MPEC 2020-X145 -- 1997 XE10
`Q11`	Shinshiro Obs., 1 in MPEC 2020-X145 -- 162173
`Q21`	Southern Utsunomiya in Japan, 1 in MPEC 2020-X145 -- 162173
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2020-X152 -- 2020 XT4
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2020-X145 -- 2020 XZ
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 11 in MPECs 2020-X144, 2020-X145 & 2020-X152 -- 2020 XT4, 2020 XN, 2020 XH4, 2020 XD, 2020 WM3, 2020 WC5, 2020 WA5, 2020 VN3, 2020 VM3, 2020 TM4, 2020 RO9
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2020-X145 & 2020-X148 -- 2020 XJ4, 2010 CA55
`L01`	Visnjan Obs. in Croatia, 7 in MPECs 2020-X141, 2020-X142, 2020-X143, 2020-X144, 2020-X145, 2020-X148 & 2020-X152 -- 2020 XT4, 2020 XJ4, 2020 XH4, 2020 XG4, 2020 XF4, 2020 XE4, 2009 XL8
`I41`	Zwicky Transient Facility (ZTF) in southern California, 23 in MPECs 2020-X142 & 2020-X145 -- 2020 XF4, 2014 JH57, 1999 HV1, 88264, 68359, 505093, 480824, 414586, 345705, 31669, 24445, 190208, 163243, 162781, 159856, 143649, 137924, 11398, 7350, 5836, 3671, 2329, 2212

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

Impact Risk Monitoring on 13 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 XF4	NEODyS	1730	2067-2120	46	1.46e-05	-6.38	-6.86	n/a	NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2020-12-05.437 to 2020-12-13.039."
2020 XF4	JPL Sentry	0600	2074-2119	21	2.0908668e-05	-6.20	-6.60	0	JPL: Computed at 21:42 Dec. 12th Pacific time based on 30 observations spanning 7.6023 days (2020-Dec-05.43588 to 2020-Dec-13.03815). Diameter approximately 0.011 km. from weighted mean H=27.40.

2020 XR	JPL Sentry	1730	R E M O V E D						JPL: Risk listing removed at 1604 UTC today
2020 XR	NEODyS	1730	R E M O V E D						-

2020 WG5	JPL Sentry	1730	2086-2120	14	0.0001731239976	-5.41	-5.50	0	JPL: Computed at 06:08 today Pacific time based on 52 observations spanning 13.943 days (2020-Nov-27.251726 to 2020-Dec-11.194257). Diameter approximately 0.010 km. from weighted mean H=27.74.
2020 WG5	NEODyS	1730	2086-2120	30	1.69e-04	-5.41	-5.48	n/a	NEODyS: "Based on 54 optical observations (of which 2 are rejected as outliers) from 2020-11-27.253 to 2020-12-11.195."

2014 ML67	JPL Sentry	0600	2023-2109	25	4.311426e-07	-4.99	-5.19	0	JPL: Computed at 12:00 Dec. 18th of 2019 Pacific time based on 6 observations spanning 1.0923 days (2014-Jun-29.32193 to 2014-Jun-30.414205). Diameter approximately 0.050 km. from weighted mean H=24.16.

2013 XU21	JPL Sentry	0600	2055-2055	1	2.291e-07	-7.08	-7.08	0	JPL: Computed at 09:46 April 12th of 2017 Pacific time based on 41 observations spanning 1.1880 days (2013-Dec-13.24754 to 2013-Dec-14.43558). Diameter approximately 0.020 km. from weighted mean H=26.18.

2011 AZ36	JPL Sentry	0600	2026-2116	176	4.112966e-07	-6.63	-8.01	0	JPL: Computed at 21:23 April 9th of 2017 Pacific time based on 9 observations spanning .44921 days (2011-Jan-13.2805 to 2011-Jan-13.72971). Diameter approximately 0.032 km. from weighted mean H=25.12.

2010 XP	JPL Sentry	0600	2021-2116	73	1.449284e-07	-7.25	-7.70	0	JPL: Computed at 11:10 April 8th of 2017 Pacific time based on 15 observations spanning .11834 days (2010-Dec-02.24919 to 2010-Dec-02.36753). Diameter approximately 0.015 km. from weighted mean H=26.78.

1979 XB	JPL Sentry	0600	2056-2113	2	7.36e-07	-2.79	-3.08	0	JPL: Computed at 07:42 April 8th of 2017 Pacific time based on 18 observations spanning 3.9189 days (1979-Dec-11.51059 to 1979-Dec-15.42951). Diameter approximately 0.662 km. from weighted mean H=18.53.

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 13 December '20

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

2305	Grabbed MPEC 2020-X149 - 2020 KK26 - see above Grabbed MPEC 2020-X150 - 2020 XR4 - see above Grabbed MPEC 2020-X151 - 2020 XS4 - see above Grabbed MPEC 2020-X152 - 2020 XT4 - see above
2000	Grabbed MPEC 2020-X148 - 2020 XJ4 - see above
1730	Noted that JPL Sentry has updated its 2020 WG5 risk assessment - see above Noted that NEODyS has updated its 2020 WG5 risk assessment - see above Noted that NEODyS has posted 2020 XF4 as an impact risk - see above Noted that JPL Sentry has removed 2020 XR as an impact risk - see above Noted that NEODyS has removed 2020 XR as an impact risk - see above Grabbed MPEC 2020-X145 - Daily Orbit Update - see above Grabbed MPEC 2020-X146 - 2018 YG - see above Grabbed MPEC 2020-X147 - 2020 XR - see above
0600	Noted that JPL Sentry has updated its 1979 XB risk assessment - see above Noted that JPL Sentry has updated its 2010 XP risk assessment - see above Noted that JPL Sentry has updated its 2011 AZ36 risk assessment - see above Noted that JPL Sentry has updated its 2013 XU21 risk assessment - see above Noted that JPL Sentry has updated its 2014 ML67 risk assessment - see above Noted that JPL Sentry has posted 2020 XF4 as an impact risk - see above
0530	Grabbed MPEC 2020-X141 - 2020 XE4 - see above Grabbed MPEC 2020-X142 - 2020 XF4 - see above Grabbed MPEC 2020-X143 - 2020 XG4 - see above Grabbed MPEC 2020-X144 - 2020 XH4 - see above

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