2020-12-25 Tracking News

Contents on 25 December '20

IAU Minor Planet Center
- NEOCP Activity -- 51 listings
- New MPECs -- three MPECs
Observers -- 20 observers
Impact Risk Monitoring -- six 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 will be some 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 1247 risk-listed objects, 150 have had news in the last 31 days. Updated at 1702 UTC on 25 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 25 December '20

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 55 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 25 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-Y124 time-stamped "12:35 UT" - Daily Orbit Update - see below
MPEC 2020-Y125 time-stamped "16:00 UT" - 2020 YA4 - see below
MPEC 2020-Y126 time-stamped "18:09 UT" - 2020 YB4

MPEC 2020-Y126 - "18:09 UT" - 2020 YB4

K20Y04B 2020 YB4 (small asteroid, H=25.1 ~32m) was picked up at 0902 UT on 23 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 23.38-39p3 and 24.31p4. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Dec. 23.50-51p3), Schiaparelli Obs. (Dec. 24.91-93p3), and Great Shefford Obs. (Dec. 24.99-01p4).

MPEC 2020-Y125 - "16:00 UT" - 2020 YA4

K20Y04A 2020 YA4 (Earth MOID=1.1 LD, H=26.6 ~16m) was picked up at 1207 UT on 23 Dec. by MLS, observing it at Dec. 23.51-52p4 and 24.47-48p4. This detection was confirmed by the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 23.54p4), Great Shefford Obs. (Dec. 25.10-13p4), and Sandlot Obs. (Dec. 25.43-45p3).

<< DOU on 25 December '20 >> MPEC 2020-Y124 - "12:35 UT" - Daily Orbit Update

Observations of risk-listed objects
K20Y03A 2020 YA3 (small asteroid, arc=4 days, H=26.0 ~21m, close passer) from the Spacewatch 1.8m telescope (Dec. 25.29p3)
99942 99942 Apophis (2004 MN4) (NHATS target) from the Catalina Sky Survey (CSS) (Dec. 22.43-45p4), LCO Sutherland A (Dec. 24.00-01p6), and ATLAS Mauna Loa (Dec. 24.62-66p4)
Observations of recently (no longer) risk-listed objects
K20X05D 2020 XD5 (arc=13 days, H=20.0 ~339m) from CSS (Dec. 24.38-40p3) and MLS (Dec. 24.39-41p4)
K20W05U 2020 WU5 (i=41.5°, arc=25 days, H=18.7 ~616m) from ATLAS Mauna Loa (Dec. 24.45-47p4)
Observations of close-passing objects
K20Y03O 2020 YO3 (arc=2 days, H=24.6 ~41m) from Northolt Branch Obs. (Dec. 24.81-82p3), Great Shefford Obs. (Dec. 24.90-91p3), and ATLAS Haleakala (Dec. 25.36-37p5)
K20Y03G 2020 YG3 (arc=2 days, H=27.0 ~13m) from LCO Sutherland A (Dec. 23.84p3)
K20O05K 2020 OK5 (arc=164 days, H=25.4 ~28m, NHATS target) from ATLAS Haleakala (Dec. 24.52-58p4)
K12UH1K 2012 UK171 (arc=3 opp, H=24.4 ~45m, NHATS target) from MLS (Dec. 24.17-18p4) and ATLAS Haleakala (Dec. 24.36-39p6)
D6617 136617 1994 CC from Pan-STARRS 2 (PS2) (Dec. 24.62-65p4)
Observation campaigns (NHATS targets, radar support)
K14T00W 2014 TW (arc=29 days, H=26.0 ~21m, NHATS) from UH/Tholen NEO Follow-Up 2.24m Telescope (2014 Oct. 31.26p1 at G=22.68)
K13Y02S 2013 YS2 (arc=2 opp, H=23.7 ~62m, NHATS) from MLS (Dec. 24.15-16p4) and ATLAS Haleakala (Dec. 24.36-39p4)
K06Y00F 2006 YF (arc=6 opp, H=20.7 ~245m, NHATS) from Pan-STARRS 1 (PS1) (Dec. 24.55-58p3)
-- NHATS target table
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y01V 2020 YV1 (arc=5 days, H=24.5 ~43m) from PS1 (Dec. 24.41-45p3)
K20Y01Q 2020 YQ1 (arc=5 days, H=23.2 ~78m) from PS1 (Dec. 24.41-45p4)
K20X02P 2020 XP2 (arc=17 days, H=22.1 ~129m) from CSS (Dec. 24.40-42p3) and ATLAS Haleakala (Dec. 24.53-55p4)
K20X00V 2020 XV (arc=20 days, H=23.9 ~56m) from Spacewatch via Kitt Peak Natl. Obs. (KPNO) (Dec. 25.25p3)
K20V07C 2020 VC7 (arc=49 days, H=24.1 ~51m) from PS2 (Dec. 24.43-45p3)
K20T07T 2020 TT7 (arc=71 days, H=22.2 ~123m) from PS2 (Dec. 24.38-42p3)
K11J00L 2011 JL (Q=4.124 AU, arc=42 days, H=21.9 ~141m) from PS1 (2011 April 28.39-41p2)
Observations of other objects
K20W05S 2020 WS5 (i=40.9°, Q=4.061 AU, arc=27 days, H=20.8 ~234m) from ATLAS Haleakala (Dec. 24.31-33p4)
K20W05M 2020 WM5 (Q=4.825 AU, arc=26 days, H=20.5 ~269m) from PS2 (Dec. 24.48-52p3)
K20W02H 2020 WH2 (Q=4.563 AU, arc=36 days, H=20.1 ~323m) from PS2 (Dec. 24.52-56p4)
K20V06Q 2020 VQ6 (arc=39 days, H=21.2 ~195m) from ATLAS Haleakala (Dec. 24.31-34p6)
K20T04G 2020 TG4 (Q=4.171 AU, arc=96 days, H=19.9 ~355m) from MLS (Dec. 24.17-19p4)
K20P05C 2020 PC5 (Q=4.177 AU, arc=132 days, H=18.5 ~676m) from ATLAS Mauna Loa (Dec. 24.29-31p4)
K19A05N 2019 AN5 (arc=5 opp, H=21.1 ~204m) from MLS (Dec. 24.31-32p4) and PS2 (Dec. 24.63-66p4)
K17Y01Z 2017 YZ1 (arc=4 opp, H=20.4 ~282m) from PS1 (Dec. 24.54-58p3)
K17B31L 2017 BL31 (q=0.370 AU, Q=4.566 AU, arc=3 opp, H=18.9 ~562m) from PS1 (Dec. 24.53-57p3)
K17A05F 2017 AF5 (q=0.124 AU, Q=4.833 AU, arc=4 opp, H=17.7 ~977m) from MLS (Dec. 24.43-45p4)
K16W10G 2016 WG10 (Q=4.152 AU, arc=3 opp, H=20.9 ~224m) from PS1 (Dec. 24.32-35p3)
K16E85D 2016 ED85 (Q=5.062 AU, arc=3 opp, H=17.7 ~977m) from ATLAS Haleakala (Dec. 24.61-63p4)
K15B04F 2015 BF4 (arc=6 opp, H=20.5 ~269m) from ATLAS Haleakala (Dec. 24.29-32p4)
K13U14X 2013 UX14 (arc=4 opp, H=18.3 ~741m) from ATLAS Haleakala (Dec. 24.35-36p4)
K12U68M 2012 UM68 (arc=4 opp, H=19.1 ~513m) from MLS (Dec. 24.43-45p4) and PS2 (Dec. 24.57-61p4)
K12S22A 2012 SA22 (arc=3 opp, H=18.1 ~812m) from CSS (Dec. 24.19-21p3)
K12H33Z 2012 HZ33 (arc=3 opp, H=20.4 ~282m) from PS1 (Dec. 24.31-35p3)
K05VB8P 2005 VP118 (arc=7 opp, H=18.9 ~562m) from PS2 (Dec. 24.59-61p2)
K03Y17P 2003 YP17 (arc=4 opp, H=19.2 ~490m) from MLS (Dec. 24.19-21p4)
K03Y01M 2003 YM1 (arc=3 opp, H=18.1 ~812m) from CSS (Dec. 24.30-32p3) and ATLAS Haleakala (Dec. 24.48-50p4)
K02T67S 2002 TS67 (arc=6 opp, H=19.1 ~513m) from ATLAS Haleakala (Dec. 24.40-43p4)
K02G08Z 2002 GZ8 (Q=4.633 AU, arc=4 opp, H=18.8 ~589m) from CSS (Dec. 24.44-46p4) and ATLAS Haleakala (Dec. 24.56-60p8)
K01Y03V 2001 YV3 (arc=3 opp, H=20.4 ~282m) from MLS (Dec. 24.23-25p4) and ATLAS Haleakala (Dec. 24.41-43p4)
J99V15X 1999 VX15 (Q=4.807 AU, arc=2 opp, H=18.7 ~616m) from ATLAS Mauna Loa (Dec. 24.36-40p3)
p3125 513125 1997 GC32 from MLS (Dec. 24.13-14p4)
n7094 497094 2004 AH from CSS (Dec. 24.31-32p4), MLS (Dec. 24.31-33p4), and ATLAS Haleakala (Dec. 24.45-47p4)
m3547 483547 2003 WM25 from PS1 (Dec. 24.48-52p4)
m0885 480885 2002 AC29 from ATLAS Haleakala (Dec. 24.34-35p5)
k4885 464885 2005 LS3 from PS1 (Dec. 7.34-38p4 at w=21.5-22.1)
k2959 462959 2011 DU from PS1 (Dec. 24.60-63p4)
j0263 450263 2003 WD158 from ATLAS Haleakala (Dec. 24.28-30p4)
h8902 438902 2009 WF104 from ATLAS Haleakala (Dec. 24.30-33p4)
f8896 418896 2009 AK15 from ATLAS Mauna Loa (Dec. 24.51-56p4)
f6694 416694 2004 YR32 from ATLAS Haleakala (Dec. 24.53-54p4)
f5029 415029 2011 UL21 from ATLAS Haleakala (Dec. 24.33-36p4)
c0128 380128 1997 WB21 from ATLAS Haleakala (Dec. 24.41-42p4)
b4855 374855 2006 VQ13 from PS1 (Nov. 26.60-63p3)
b3579 373579 2002 AW11 from ATLAS Haleakala (Dec. 24.30-33p4)
Z7621 357621 2005 EG94 from PS2 (Dec. 24.57-61p4)
Z5046 355046 2006 SO19 from PS2 (Dec. 7.35-38p4)
Y5705 345705 2006 VB14 from ATLAS Haleakala (Dec. 24.22-24p4)
X0825 330825 2008 XE3 from Brainerd Obs. (2012 Nov. 20.09p2)
V3276 313276 2002 AX1 from ATLAS Haleakala (Dec. 24.57-59p3)
U3262 303262 2004 RJ84 from MLS (Dec. 24.08-10p4)
U2591 302591 2002 QE7 from MLS (Dec. 24.17-18p4)
S3729 283729 2002 UX from MLS (Dec. 24.20-21p3) and ATLAS Haleakala (Dec. 24.42-43p4)
P2399 252399 2001 TX44 from NEAT's Mt. Palomar telescope (2001 Sept. 19.50p1)
O1596 241596 1998 XM2 from CSS (Dec. 24.21-23p3)
K3471 203471 2002 AU4 from MLS (Dec. 24.46-47p4)
K2411 202411 2005 RC from ATLAS Mauna Loa (Dec. 24.44-46p4)
J8752 198752 2005 EA60 from PS2 (Dec. 24.57-61p4)
I6822 186822 2004 FE31 from ATLAS Mauna Loa (Dec. 24.32-37p4)
H3664 173664 2001 JU2 from PS2 (Dec. 24.62-65p3)
G3902 163902 2003 SW222 from ATLAS Haleakala (Dec. 24.35-36p3)
G2186 162186 1999 OP3 from ATLAS Haleakala (Dec. 24.52-53p4)
G2173 162173 Ryugu (1999 JU3) from ATLAS Mauna Loa (Dec. 24.23-25p4)
G2039 162039 1996 JG from ATLAS Haleakala (Dec. 24.37-40p4)
F9923 159923 2004 YJ32 from MLS (Dec. 24.33-35p4) and PS2 (Dec. 24.63-66p4)
F4302 154302 2002 UQ3 from ATLAS Mauna Loa (Dec. 24.20-23p6)
F2978 152978 2000 GJ147 from PS1 (Dec. 10.37-41p3)
F2941 152941 2000 FM10 from MLS (Dec. 24.48-50p4)
E2464 142464 2002 TC9 from ATLAS Mauna Loa (Dec. 24.48-51p4)
E1079 141079 2001 XS30 from ATLAS Mauna Loa (Dec. 24.41-44p3)
D8971 138971 2001 CB21 from MLS (Dec. 24.48-49p4)
D8947 138947 2001 BA40 from ATLAS Haleakala (Dec. 24.36-37p4)
D7925 137925 2000 BJ19 from ATLAS Haleakala (Dec. 24.61-65p5)
D7805 137805 1999 YK5 from CSS (Dec. 24.09-10p3)
D7099 137099 1998 YW3 from PS1 (Dec. 24.48-52p4)
99935 99935 2002 AV4 from ATLAS Haleakala (Dec. 24.53-54p4)
89355 89355 2001 VS78 from CSS (Dec. 24.31-32p4) and ATLAS Haleakala (Dec. 24.45-47p4)
87684 87684 2000 SY2 from ATLAS Mauna Loa (Dec. 24.25-26p4)
86450 86450 2000 CK33 from ATLAS Mauna Loa (Dec. 24.58-60p4)
86039 86039 1999 NC43 from MLS (Dec. 24.06-07p4)
85275 85275 1994 LY from ATLAS Mauna Loa (Dec. 24.32-37p4)
65803 65803 Didymos (1996 GT) from MLS (Dec. 24.44-45p4) and PS2 (Dec. 24.57-58p2)
65717 65717 1993 BX3 from PS1 (Dec. 24.27-30p4) and ATLAS Mauna Loa (Dec. 24.32-34p7)
55532 55532 2001 WG2 from PS2 (Dec. 11.35-39p4)
53430 53430 1999 TY16 from CSS (Dec. 24.11-12p2) and ATLAS Haleakala (Dec. 24.20-22p4)
53319 53319 1999 JM8 from PS2 (Dec. 24.59-62p3)
35107 35107 1991 VH from ATLAS Mauna Loa (Dec. 24.23-25p4)
30825 30825 1990 TG1 from SATINO-1 (2019 Nov. 12.09-11p2)
29075 29075 1950 DA from MLS (Dec. 24.50-52p4)
23183 23183 2000 OY21 from ATLAS Haleakala (Dec. 24.61-63p4)
21088 21088 Chelyabinsk (1992 BL2) from CSS (Dec. 24.33-34p4) and ATLAS Haleakala (Dec. 24.48-50p4)
12538 12538 1998 OH from ATLAS Mauna Loa (Dec. 24.39-40p3)
11405 11405 1999 CV3 from ATLAS Mauna Loa (Dec. 24.20-23p4)
10150 10150 1994 PN from CSS (Dec. 24.25-28p2)
08709 8709 Kadlu (1994 JF1) from PS1 (Dec. 24.53-56p3 at w=22.0-22.1)
08567 8567 1996 HW1 from CSS (Dec. 24.32-34p4) and ATLAS Haleakala (Dec. 24.47-50p3)
08037 8037 1993 HO1 from CSS (Dec. 24.49-50p2)
08034 8034 Akka (1992 LR) from PS1 (Dec. 24.60-63p4)
07977 7977 1977 QQ5 from ATLAS Mauna Loa (Dec. 24.20-22p4)
07753 7753 1988 XB from MASTER OAFA Obs. (Dec. 24.12-15p2) and ATLAS Haleakala (Dec. 24.37-38p3)
06053 6053 1993 BW3 from CSS (Dec. 24.09-10p4)
05879 5879 Almeria (1992 CH1) from ATLAS Mauna Loa (Dec. 24.52-54p4)
05836 5836 1993 MF from MLS (Dec. 24.11-12p4) and CSS (Dec. 24.20p1)
05131 5131 1990 BG from CSS (Dec. 24.50-52p4) and ATLAS Haleakala (Dec. 24.63-65p4)
04957 4957 Brucemurray (1990 XJ) from ATLAS Mauna Loa (Dec. 24.62-65p4)
04953 4953 1990 MU from ATLAS Mauna Loa (Dec. 24.20-23p4)
04055 4055 Magellan (1985 DO2) from ATLAS Mauna Loa (Dec. 24.31-33p4)
03552 3552 Don Quixote (1983 SA) from PS1 (Dec. 24.41-45p4)
03360 3360 Syrinx (1981 VA) from MLS (Dec. 24.17-18p4)
02368 2368 Beltrovata (1977 RA) from ATLAS Haleakala (Dec. 24.36-37p4)
01980 1980 Tezcatlipoca (1950 LA) from ATLAS Mauna Loa (Dec. 24.61-64p4)
01943 1943 Anteros (1973 EC) from ATLAS Mauna Loa (Dec. 24.58-66p7)
01866 1866 Sisyphus (1972 XA) from ATLAS Haleakala (Dec. 24.63-66p4)
01685 1685 Toro (1948 OA) from ATLAS Mauna Loa (Dec. 24.64-67p4)
01580 1580 Betulia (1950 KA) from ATLAS Haleakala (Dec. 24.27-31p4)
01036 1036 Ganymed (1924 TD) from ATLAS Mauna Loa (Dec. 24.44-47p4)

Observers on 25 December '20

A total of 20 observers appear in today's MPECs.

Code	Observer / observatory
`T05`	ATLAS Haleakala in Hawaii, 41 in MPEC 2020-Y124 -- 2020 YO3, 2020 XP2, 2020 WS5, 2020 VQ6, 2020 OK5, 2016 ED85, 2015 BF4, 2013 YS2, 2013 UX14, 2012 UK171, 2003 YM1, 2002 TS67, 2002 GZ8, 2001 YV3, 99935, 89355, 53430, 497094, 480885, 450263, 438902, 416694, 415029, 380128, 373579, 345705, 313276, 283729, 23183, 21088, 163902, 162186, 162039, 138947, 137925, 8567, 7753, 5131, 2368, 1866, 1580
`T08`	ATLAS Mauna Loa in Hawaii, 27 in MPEC 2020-Y124 -- 2020 WU5, 2020 PC5, 1999 VX15, 99942, 87684, 86450, 85275, 65717, 418896, 35107, 202411, 186822, 162173, 154302, 142464, 141079, 12538, 11405, 7977, 5879, 4957, 4953, 4055, 1980, 1943, 1685, 1036
`726`	Brainerd Obs. in Minnesota, 1 in MPEC 2020-Y124 -- 330825
`703`	Catalina Sky Survey (CSS) in Arizona, 18 in MPEC 2020-Y124 -- 2020 XP2, 2020 XD5, 2012 SA22, 2003 YM1, 2002 GZ8, 99942, 89355, 53430, 497094, 241596, 21088, 137805, 10150, 8567, 8037, 6053, 5836, 5131
`V06`	Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2020-Y125 -- 2020 YA4
`J95`	Great Shefford Obs. in England, 3 in MPECs 2020-Y124, 2020-Y125 & 2020-Y126 -- 2020 YO3, 2020 YB4, 2020 YA4
`695^`	Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2020-Y124 -- 2020 XV
`K91`	LCO Sutherland A in South Africa, 2 in MPEC 2020-Y124 -- 2020 YG3, 99942
`W92`	MASTER OAFA Obs., 1 in MPEC 2020-Y124 -- 7753
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 25 in MPECs 2020-Y124, 2020-Y125 & 2020-Y126 -- 2020 YB4, 2020 YA4, 2020 XD5, 2020 TG4, 2019 AN5, 2017 AF5, 2013 YS2, 2012 UM68, 2012 UK171, 2003 YP17, 2001 YV3, 86039, 65803, 513125, 497094, 303262, 302591, 29075, 283729, 203471, 159923, 152941, 138971, 5836, 3360
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2020-Y124 -- 252399
`Z80`	Northolt Branch Obs. in England, 1 in MPEC 2020-Y124 -- 2020 YO3
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 18 in MPEC 2020-Y124 -- 2020 YV1, 2020 YQ1, 2017 YZ1, 2017 BL31, 2016 WG10, 2012 HZ33, 2011 JL, 2006 YF, 65717, 483547, 464885, 462959, 374855, 152978, 137099, 8709, 8034, 3552
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 16 in MPEC 2020-Y124 -- 2020 WM5, 2020 WH2, 2020 VC7, 2020 TT7, 2019 AN5, 2012 UM68, 2005 VP118, 65803, 55532, 53319, 357621, 355046, 198752, 173664, 159923, 136617
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2020-Y125 -- 2020 YA4
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y124 -- 30825
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2020-Y126 -- 2020 YB4
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2020-Y124 -- 2020 YA3
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2020-Y126 -- 2020 YB4
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y124 -- 2014 TW

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

Impact Risk Monitoring on 25 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 YA3	JPL Sentry	1700	2049-2119	16	1.7694435e-05	-5.28	-5.38	0	JPL: Computed at 06:42 today Pacific time based on 28 observations spanning 3.9383 days (2020-Dec-21.355978 to 2020-Dec-25.29423). Diameter approximately 0.021 km. from weighted mean H=26.02.
2020 YA3	NEODyS	1700	2049-2119	26	2.13e-05	-5.20	-5.28	0	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2020-12-21.357 to 2020-12-25.295."

2016 RP41	JPL Sentry	1700	2022-2114	48	1.54046e-08	-5.97	-6.36	0	JPL: Computed at 17:35 April 8th of 2017 Pacific time based on 7 observations spanning .75865 days (2016-Sep-12.51611 to 2016-Sep-13.27476). Diameter approximately 0.110 km. from weighted mean H=22.48.

2016 AZ193	JPL Sentry	1700	2020-2114	492	2.1894676e-06	-6.19	-7.15	0	JPL: Computed at 14:28 April 6th of 2017 Pacific time based on 9 observations spanning .15930 days (2016-Jan-03.25638 to 2016-Jan-03.41568). Diameter approximately 0.016 km. from weighted mean H=26.62.

2011 MD	NEODyS	0600	2078-2199	319	3.76e-05	-6.45	-7.17	n/a	NEODyS: "Based on 1555 optical observations (of which 13 are rejected as outliers) from 2011-06-21.284 to 2011-09-03.521."

2010 XN69	JPL Sentry	1700	2024-2116	142	6.94032716e-05	-4.85	-6.01	0	JPL: Computed at 21:19 April 6th of 2017 Pacific time based on 15 observations spanning .89999 days (2010-Dec-15.23581 to 2010-Dec-16.1358). Diameter approximately 0.019 km. from weighted mean H=26.31.

2009 FG	JPL Sentry	1700	2022-2112	30	7.9293827e-06	-5.34	-5.92	0	JPL: Computed at 16:15 April 8th of 2017 Pacific time based on 63 observations spanning 15.836 days (2009-Mar-16.3986 to 2009-Apr-01.2342). Diameter approximately 0.027 km. from weighted mean H=25.51.

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 25 December '20

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

1900	Grabbed MPEC 2020-Y126 - 2020 YB4 - see above
1700	Noted that JPL Sentry has updated its 2009 FG risk assessment - see above Noted that JPL Sentry has updated its 2010 XN69 risk assessment - see above Noted that JPL Sentry has updated its 2016 AZ193 risk assessment - see above Noted that JPL Sentry has updated its 2016 RP41 risk assessment - see above Noted that JPL Sentry has updated its 2020 YA3 risk assessment - see above Noted that NEODyS has updated its 2020 YA3 risk assessment - see above Grabbed MPEC 2020-Y124 - Daily Orbit Update - see above Grabbed MPEC 2020-Y125 - 2020 YA4 - see above
0600	Noted that NEODyS has updated its 2011 MD risk assessment - see above

http://www.HohmannTransfer.com/mn/20/20360_1225.htm
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