Contents  on 25 January '20

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed 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.

Traffic Report  on 25 January '20

Fourteen objects reported inside ten LD

There are fourteen visitors reported passing within ten lunar distances (LD) of our planet today. The nearest is newly announced intruder 2020 BH6, which moved in from 0.51 and out to 1.73 LD as it passed us at 0.18 LD and the Moon at 0.71 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.18 LD today 2020 BH6 6 m  0.18 LD Jan. 20 - 29 NEW, intruder today, Earth closest at 0510 UTC,
Moon closest 0.71 LD at 1313 UTC - MPEC
0.69 LD Jan. 22 2020 BB5 4 m  6.02 to 8.01 LD Jan. 17 - 26 intruder, NHATS target, risk - DOU
0.78 LD Jan. 20 2020 BK3 14 m  9.73 to 12.08 LD Jan. 16 - 25 intruder, exits ten LD, risk - DOU
2.00 LD Jan. 21 2020 BB 7 m  3.33 to 4.02 LD Jan. 9 - Feb. 2 NHATS target, risk - DOU
2.56 LD Jan. 23 2020 BB1 8 m  4.90 to 7.20 LD Jan. 19 - 27
2.73 LD Jan. 14 2020 BH 8 m  8.76 to 9.49 LD Jan. 1 - 26 NHATS target, risk - DOU
2.99 LD Jan. 14 2020 BS 9 m  9.94 to 10.84 LD Jan. 4 - 25 NHATS target, exits ten LD - DOU
3.71 LD Jan. 10 2019 YF4 13 m  9.89 to 10.45 LD Dec. 27 - today NHATS target, exits ten LD
5.09 LD tomorrow 2020 BH3 21 m  5.14 from 5.57 LD Jan. 20 - Feb. 1 NHATS target, risk - DOU
6.4   LD Jan. 19* 2020 BK 16 m  8.5 to 9.2 LD Jan. 11 - 27 EPU +/- 12 mins.*, NHATS target
6.61 LD Jan. 21 2020 BS1 19 m  7.89 to 8.63 LD Jan. 15 - 27 NHATS target - DOU
7.26 LD Jan. 22 2020 BF6 28 m  8.54 to 9.72 LD Jan. 19 - 26 NEW - MPEC, DOU
7.74 LD yesterday 2020 BF1 20 m  7.78 to 7.95 LD Jan. 18 - 30 NHATS target - DOU
8.32 LD today 2020 AK3 21 m  8.32 LD Jan. 21 - 28 NHATS target, Earth closest at 0722 UTC - DOU

This report was generated at 2310 UTC with four discoveries, starting with two from late yesterday, inbound intruder 2020 BH6 (MPEC) and outbound 2020 BF6 (MPEC, DOU). From today we have two approaching objects: 2020 BV7 (MPEC) and 2020 BJ7 (MPEC). Today's DOU MPEC has follow-up for twenty close passers, including eleven with risk listings. There are three of these objects in the approach table below and nine in the active traffic table above, plus eight departed: 2020 BD5, 2020 BY, 2020 BD, 2019 YD3, 2019 YA1, and three risk-listed: 2020 BY1, 2020 AY1, 2019 YW2. We also have radar observation from mid-December of 2019 XO3 and the recovery of distant 2018 BU1 (DOU).

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.83 LD Jan. 27 2020 BN3 29 m  10.38 from 15.86 LD tomorrow - Jan. 28 DOU
1.2   LD Jan. 28* 2020 BJ7 8 m  10.7 from 15.2 LD tomorrow - Jan. 30 NEW, EPU +/- 49 mins.* - MPEC
5.89 LD Jan. 30 2020 BV7 9 m  10.45 from 12.06 LD tomorrow - Feb. 3 NEW - MPEC
6.89 LD Jan. 27 2020 BY4 20 m  11.45 from 15.52 LD tomorrow - Jan. 29 risk - DOU
5.7   LD Jan. 31* 2020 BZ4 10 m  12.9 from 14.7 LD Jan. 27 - Feb. 4 EPU +/- 16 mins.*, NHATS target
3.69 LD Feb. 4 2013 BA74 27 m  15.67 from 17.30 LD Jan. 29 - Feb. 9
5.2   LD Feb. 9* 2020 BW5 17 m  31.1 from 33.3 LD Feb. 5 - 14 EPU +/- 1.05 hours*, NHATS target, risk - DOU
* EPU = Earth passage uncertainty



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. "Distant" is used here to describe an object under observation that has come within ten LD since A/CC began this traffic reporting in 2007 but is not now so close. Object temporal distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 25 January '20

Radar observation of four objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0200 UTC when the database was dated 24 Jan.


Data update noted at 0225 UTC when the database was dated 24 Jan.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 25 January '20

The MPC's NEO Confirmation Page has 104 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 104 objects listed. Of these, 52 were "one nighters." The Tracking News counted a total of 154 listings on the NEOCP on this day.

New MPECs  on 25 January '20

Minor Planet Electronic Circulars

There were 30 MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2020-B174 - "22:26 UT" - 2020 BE8


MPEC 2020-B173 - "22:03 UT" - 2020 BD8


MPEC 2020-B172 - "22:01 UT" - 2020 BC8


MPEC 2020-B171 - "21:59 UT" - 2020 BB8


MPEC 2020-B170 - "21:48 UT" - 2020 BA8


MPEC 2020-B169 - "21:42 UT" - 2020 BZ7


MPEC 2020-B168 - "21:29 UT" - 2009 CE


MPEC 2020-B167 - "21:25 UT" - 2020 BY7


MPEC 2020-B166 - "21:23 UT" - 2020 BX7


MPEC 2020-B165 - "21:19 UT" - 2020 BW7


MPEC 2020-B164 - "21:19 UT" - 2020 BV7


MPEC 2020-B163 - "20:30 UT" - 2020 BS7


MPEC 2020-B162 - "20:15 UT" - 2020 BR7


MPEC 2020-B161 - "19:21 UT" - 2020 BQ7


MPEC 2020-B160 - "19:14 UT" - 2020 BP7


MPEC 2020-B159 - "19:12 UT" - 2020 BO7


MPEC 2020-B158 - "19:11 UT" - 2020 BN7


MPEC 2020-B157 - "19:09 UT" - 2020 BM7


MPEC 2020-B156 - "19:03 UT" - 2020 BL7


MPEC 2020-B155 - "19:01 UT" - 2020 BK7


MPEC 2020-B154 - "18:57 UT" - 2020 BJ7


MPEC 2020-B153 - "17:54 UT" - 2020 BH7


MPEC 2020-B152 - "14:47 UT" - 2019 YG7


MPEC 2020-B151 - "14:40 UT" - 2020 BD7


MPEC 2020-B150 - "14:37 UT" - 2020 BC7


MPEC 2020-B149 - "14:35 UT" - 2020 BB7


<< DOU on 25 January '20 >>  MPEC 2020-B148 - "12:12 UT" - Daily Orbit Update


MPEC 2020-B147 - "03:25 UT" - 2020 BZ6


MPEC 2020-B146 - "03:21 UT" - 2020 BY6


MPEC 2020-B145 - "03:17 UT" - 2020 BX6

Observers  on 25 January '20

A total of 43 observers appeared in this day's MPECs.

CodeObserver / observatory
U71AHS Obs., 1 in MPEC 2020-B148 -- 163373
251Arecibo in Puerto Rico, 4 in radar -- 2019 XQ3, 2019 XO3, 2019 VK3, 2019 UO
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2020-B148 -- 2019 WB6, 2019 SZ2, 2019 SU, 2019 QV, 2016 AR130, 2015 AX44, 463216, 386281, 35107, 1627
T05ATLAS Haleakala in Hawaii, 25 in MPEC 2020-B148 -- 2020 BO1, 2019 XG1, 2017 AE5, 2015 DE200, 2013 AW52, 2012 BE124, 1996 AE2, 89830, 52768, 483878, 416591, 416231, 281365, 248926, 237805, 18172, 163696, 162080, 137199, 137099, 136993, 136795, 103067, 1981, 1866
T08ATLAS Mauna Loa in Hawaii, 44 in MPECs 2020-B148 & 2020-B174 -- 2020 BE8, 2020 BE2, 2020 BB3, 2020 AD3, 2018 BP, 2015 XK351, 2013 DU, 2008 OX1, 2007 BJ29, 2006 KY86, 90075, 87684, 66146, 65690, 54686, 512245, 512244, 506459, 492143, 488490, 458732, 437316, 391275, 36236, 35107, 338347, 311044, 310442, 203015, 20255, 162038, 153267, 138127, 137199, 137120, 11405, 11066, 106589, 106538, 8566, 7092, 4487, 4183, 2059
160Castelmartini Obs. in Italy, 2 in MPEC 2020-B148 -- 2020 BE, 2014 NF64
703Catalina Sky Survey (CSS) in Arizona, 40 in MPEC 2020-B148 -- 2020 BB3, 2019 WB6, 2015 XK351, 2013 UV10, 2013 DU, 2008 OX1, 2006 KY86, 96315, 90075, 66959, 54686, 53110, 512245, 512244, 500094, 458732, 428223, 378610, 35107, 311044, 310442, 218863, 203015, 163760, 162038, 154278, 153842, 138127, 137925, 137170, 137120, 136582, 11405, 11066, 106589, 106538, 8566, 7092, 4183, 2059
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 12 in MPECs 2020-B148, 2020-B149, 2020-B156, 2020-B158, 2020-B160, 2020-B165, 2020-B166, 2020-B167, 2020-B170, 2020-B171 & 2020-B173 -- 2020 BY7, 2020 BX7, 2020 BW7, 2020 BR1, 2020 BP7, 2020 BN7, 2020 BL7, 2020 BD8, 2020 BB8, 2020 BB7, 2020 BB5, 2020 BA8
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2020-B145 -- 2020 BX6
A77Chante-Perdrix Obs. in France, 1 in MPEC 2020-B163 -- 2020 BS7
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2020-B163 -- 2020 BS7
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-B163 -- 2020 BS7
E89Geyserland Obs. in New Zealand, 4 in MPEC 2020-B148 -- 138013, 11405, 5626, 1627
K88GINOP-KHK in Hungary, 3 in MPECs 2020-B163, 2020-B169 & 2020-B172 -- 2020 BZ7, 2020 BS7, 2020 BC8
J95Great Shefford Obs. in England, 1 in MPEC 2020-B163 -- 2020 BS7
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2020-B163 -- 2020 BS7
246KLENOT in the Czech Republic, 17 in MPECs 2020-B146, 2020-B148, 2020-B161, 2020-B162, 2020-B163 & 2020-B172 -- 2020 BY6, 2020 BV, 2020 BS7, 2020 BS1, 2020 BR7, 2020 BQ7, 2020 BQ2, 2020 BP4, 2020 BN3, 2020 BK3, 2020 BH1, 2020 BE, 2020 BC8, 2020 BB3, 2020 AO3, 2020 AK3, 2020 AD3
Z43Landehen Obs., 1 in MPEC 2020-B148 -- 2020 BE
H01Magdalena Ridge Obs. (MRO) in New Mexico, 12 in MPECs 2020-B148, 2020-B150, 2020-B153, 2020-B154, 2020-B155, 2020-B159, 2020-B160, 2020-B163, 2020-B164, 2020-B167, 2020-B170 & 2020-B173 -- 2020 BY7, 2020 BV7, 2020 BS7, 2020 BP7, 2020 BO7, 2020 BK7, 2020 BJ7, 2020 BH7, 2020 BD8, 2020 BC7, 2020 BA8, 2018 BU1
711McDonald Obs. in Texas, 1 in MPEC 2020-B163 -- 2020 BS7
V14Moose Springs Obs., 2 in MPEC 2020-B148 -- 2014 YW34, 2014 YU43
G19MPC code G19, 1 in MPEC 2020-B148 -- 163373
474Mt. John Obs. in New Zealand, 1 in MPEC 2020-B145 -- 2020 BX6
G96Mt. Lemmon Survey (MLS) in Arizona, 80 in MPECs 2020-B146, 2020-B148, 2020-B149, 2020-B150, 2020-B153, 2020-B154, 2020-B158, 2020-B163, 2020-B164, 2020-B165, 2020-B167, 2020-B169, 2020-B170, 2020-B172 & 2020-B173 -- 2020 BZ7, 2020 BY7, 2020 BY6, 2020 BW7, 2020 BW5, 2020 BV7, 2020 BS7, 2020 BQ2, 2020 BN7, 2020 BJ7, 2020 BH7, 2020 BH, 2020 BE, 2020 BD8, 2020 BC8, 2020 BC7, 2020 BB7, 2020 BA8, 2020 AS2, 2019 YX5, 2019 YR5, 2019 YE4, 2019 YD2, 2019 WW4, 2019 WF3, 2019 TV33, 2019 SH6, 2019 SH1, 2018 CW13, 2018 BU1, 2017 MX4, 2016 UT80, 2016 GZ215, 2015 MN66, 2015 BK509, 2015 AJ44, 2014 NF64, 2014 AD17, 2011 VR5, 2010 SD13, 2009 FU4, 2008 RS26, 2006 TD1, 2004 BT58, 99248, 531060, 529668, 511684, 482244, 477492, 462550, 420187, 385497, 382406, 36284, 354101, 34613, 339714, 331792, 313809, 307070, 306462, 276397, 275975, 25916, 258325, 228368, 177651, 17274, 171486, 163373, 159504, 154029, 152889, 141525, 138971, 138846, 137924, 137084, 102873
Z80Northolt Branch Obs. in England, 5 in MPEC 2020-B148 -- 2020 BY, 2020 BR, 2020 BB, 2015 DE200, 52768
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2020-B148 -- 2015 OX78, 2011 CT4
F51Pan-STARRS 1 (PS1) in Hawaii, 57 in MPECs 2020-B145, 2020-B147, 2020-B148, 2020-B149, 2020-B150, 2020-B151, 2020-B152, 2020-B154, 2020-B156, 2020-B157, 2020-B159, 2020-B160, 2020-B164, 2020-B165, 2020-B166, 2020-B167, 2020-B168, 2020-B170, 2020-B171 & 2020-B174 -- 2020 BZ6, 2020 BY7, 2020 BX7, 2020 BX6, 2020 BW7, 2020 BV7, 2020 BS3, 2020 BP7, 2020 BP6, 2020 BO7, 2020 BM7, 2020 BL7, 2020 BK4, 2020 BJ7, 2020 BE8, 2020 BD7, 2020 BC7, 2020 BC5, 2020 BB8, 2020 BB7, 2020 BA8, 2019 YW3, 2019 YG7, 2019 YA1, 2017 DS35, 2017 BF3, 2015 HB10, 2014 YV43, 2013 CM129, 2012 BD124, 2009 CE, 2008 XW2, 2008 PG2, 2008 OX1, 2007 WX4, 2003 VE1, 512245, 488490, 437316, 415713, 413421, 38071, 370307, 267940, 249595, 23714, 19764, 164400, 138127, 136582, 8566, 4660, 3271, 1917, 1866, 1221, 719
F52Pan-STARRS 2 (PS2) in Hawaii, 35 in MPECs 2020-B147, 2020-B148, 2020-B150, 2020-B152, 2020-B155, 2020-B159, 2020-B160, 2020-B161, 2020-B162, 2020-B165, 2020-B166, 2020-B168, 2020-B169, 2020-B171, 2020-B172 & 2020-B174 -- 2020 BZ7, 2020 BZ6, 2020 BX7, 2020 BW7, 2020 BT1, 2020 BR7, 2020 BQ7, 2020 BP7, 2020 BO7, 2020 BK7, 2020 BG1, 2020 BE8, 2020 BD5, 2020 BD, 2020 BC8, 2020 BC7, 2020 BB8, 2020 AB3, 2019 YG7, 2019 YD3, 2019 XN1, 2019 SH1, 2015 DD200, 2009 CS1, 2009 CE, 2004 XP14, 2004 XK29, 86326, 68278, 443923, 386298, 311044, 310442, 174806, 136618
L18QOS Obs., 5 in MPEC 2020-B148 -- 2020 BO1, 2017 AE5, 2015 OX78, 2015 DE200, 2011 CT4
L04ROASTERR-1 in Romania, 1 in MPEC 2020-B174 -- 2020 BE8
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2020-B161, 2020-B162 & 2020-B163 -- 2020 BS7, 2020 BR7, 2020 BQ7
C95SATINO-1 in France, 2 in MPECs 2020-B148 & 2020-B163 -- 2020 BS7, 2016 AX147
K96Savelli Obs., 3 in MPECs 2020-B146 & 2020-B148 -- 2020 BY6, 2020 BG6, 2020 BF6
204Schiaparelli Obs. in Italy, 2 in MPECs 2020-B162 & 2020-B163 -- 2020 BS7, 2020 BR7
033Schwarzschild Obs. in Germany, 11 in MPECs 2020-B146, 2020-B149, 2020-B151, 2020-B158, 2020-B161, 2020-B162, 2020-B163, 2020-B168, 2020-B172, 2020-B173 & 2020-B174 -- 2020 BY6, 2020 BS7, 2020 BR7, 2020 BQ7, 2020 BN7, 2020 BE8, 2020 BD8, 2020 BD7, 2020 BC8, 2020 BB7, 2009 CE
G40'W.F. Cashwell in Nevada via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-B148 -- 2015 DE200
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2020-B148, 2020-B157 & 2020-B161 -- 2020 BW5, 2020 BS, 2020 BQ7, 2020 BM7, 2020 BH, 2020 BA5, 2019 YM6
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2020-B148 -- 2020 BZ, 2020 BY1, 2020 BP1, 2020 BK3, 2020 BJ4, 2020 BB5, 2020 AY1
I52Steward Obs. Mt. Lemmon Station in Arizona, 28 in MPECs 2020-B146, 2020-B148, 2020-B150, 2020-B151, 2020-B153, 2020-B158, 2020-B161, 2020-B162, 2020-B163, 2020-B164, 2020-B169, 2020-B170 & 2020-B172 -- 2020 BZ7, 2020 BY6, 2020 BY4, 2020 BV7, 2020 BU1, 2020 BS7, 2020 BS1, 2020 BR7, 2020 BR5, 2020 BQ7, 2020 BQ3, 2020 BP4, 2020 BO2, 2020 BN7, 2020 BN3, 2020 BN2, 2020 BK3, 2020 BH7, 2020 BE5, 2020 BD7, 2020 BC8, 2020 BC7, 2020 BA8, 2020 BA4, 2020 AZ2, 2020 AY2, 2020 AW2, 2018 BU1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 9 in MPEC 2020-B148 -- 2020 BY1, 2020 BU3, 2020 BK3, 2020 BH3, 2020 BH, 2020 BF1, 2020 BB, 2020 AY1, 2019 YW2
L01Visnjan Obs., 9 in MPECs 2020-B146, 2020-B148, 2020-B155, 2020-B157, 2020-B161, 2020-B162, 2020-B163, 2020-B168 & 2020-B172 -- 2020 BY6, 2020 BS7, 2020 BR7, 2020 BQ7, 2020 BM7, 2020 BL6, 2020 BK7, 2020 BC8, 2009 CE
C51WISE in Earth polar orbit, 3 in MPEC 2020-B148 -- 463282, 18882, 106538
I41Zwicky Transient Facility (ZTF) in southern California, 16 in MPECs 2020-B148 & 2020-B152 -- 2020 BE, 2019 YG7, 2019 XG1, 2019 BO1, 2006 KY86, 2004 MD, 2004 CH52, 89830, 516986, 511684, 511243, 438452, 34613, 6456, 4183, 1620
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 January '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 BD8JPL Sentry23322032-211786.9741e-09-5.58-5.900JPL: Computed at 15:28 today Pacific time based on 25 observations spanning 1.9668 days (2020-Jan-23.13137 to 2020-Jan-25.09817). Diameter approximately 0.265 km. from weighted mean H=20.53.
2020 BC8JPL Sentry23322047-2119875.776629e-07-3.59-4.350JPL: Computed at 15:09 today Pacific time based on 34 observations spanning 2.7096 days (2020-Jan-23.15173 to 2020-Jan-25.86134). Diameter approximately 0.377 km. from weighted mean H=19.78.
2020 BH7NEODyS2132211013.35e-07-8.14-8.140NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2020-01-24.330 to 2020-01-25.311."
JPL Sentry19002100-211034.513451e-07-8.00-8.000JPL: Computed at 10:57 today Pacific time based on 20 observations spanning .98087 days (2020-Jan-24.32905 to 2020-Jan-25.30992). Diameter approximately 0.010 km. from weighted mean H=27.72.
2020 BW5JPL Sentry16302040-2112217.1382443e-06-5.74-5.820JPL: Computed at 06:36 today Pacific time based on 20 observations spanning 2.8563 days (2020-Jan-22.516545 to 2020-Jan-25.37281). Diameter approximately 0.017 km. from weighted mean H=26.44.
NEODyS16302040-2118306.78e-06-5.79-5.890NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2020-01-22.517 to 2020-01-25.374."
2020 BB5JPL Sentry16302087-2119120.000167445641-6.28-6.430JPL: Computed at 06:53 today Pacific time based on 35 observations spanning 2.0705 days (2020-Jan-23.32313 to 2020-Jan-25.39362). Diameter approximately 0.004 km. from weighted mean H=29.55.
NEODyS16302087-2116161.87e-04-6.26-6.360NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2020-01-23.324 to 2020-01-25.394."
2020 BY4JPL Sentry16302055-2117186.635517e-06-5.51-5.940JPL: Computed at 06:29 today Pacific time based on 22 observations spanning 4.9957 days (2020-Jan-20.412927 to 2020-Jan-25.40861). Diameter approximately 0.020 km. from weighted mean H=26.12.
NEODyS16302055-2118258.11e-06-5.44-5.860NEODyS: "Based on 25 optical observations (of which 3 are rejected as outliers) from 2020-01-20.414 to 2020-01-25.409."
2020 BJ4NEODyS1630R E M O V E D-
2020 BK3JPL Sentry16302091-2107110.00051924-4.40-4.420JPL: Computed at 06:36 today Pacific time based on 64 observations spanning 3.0212 days (2020-Jan-22.395303 to 2020-Jan-25.41652). Diameter approximately 0.014 km. from weighted mean H=26.92.
NEODyS16302091-2113216.13e-04-4.35-4.350NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2020-01-22.396 to 2020-01-25.417."
2020 BH3JPL Sentry16302059-210461.1340673e-06-6.79-7.240JPL: Computed at 06:55 today Pacific time based on 21 observations spanning 2.9296 days (2020-Jan-21.274771 to 2020-Jan-24.2044). Diameter approximately 0.021 km. from weighted mean H=26.08.
NEODyS16302059-210647.54e-07-7.03-7.130NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2020-01-21.276 to 2020-01-24.205."
2020 BY1JPL Sentry16302049-204921.83012e-06-5.96-5.980JPL: Computed at 06:35 today Pacific time based on 54 observations spanning 4.7913 days (2020-Jan-20.460859 to 2020-Jan-25.25212). Diameter approximately 0.019 km. from weighted mean H=26.26.
NEODyS1630204921.43e-07-7.08-7.10NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2020-01-20.462 to 2020-01-25.253."
2020 BF1JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1458 UTC today
2020 BHJPL Sentry16302107-210711.598e-06-7.78-7.780JPL: Computed at 06:33 today Pacific time based on 42 observations spanning 7.0842 days (2020-Jan-18.33189 to 2020-Jan-25.41609). Diameter approximately 0.008 km. from weighted mean H=28.14.
NEODyS16302107-211458.43e-07-8.09-8.410NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2020-01-18.333 to 2020-01-25.417."
2020 BBJPL Sentry1630R E M O V E DJPL: Risk listing removed at 1434 UTC today
NEODyS16302115-211832.78e-07-8.80-8.870NEODyS: "Based on 84 optical observations (of which 1 are rejected as outliers) from 2020-01-18.290 to 2020-01-24.535."
2020 AY1JPL Sentry16302103-210311.586e-07-7.26-7.260JPL: Computed at 06:56 today Pacific time based on 107 observations spanning 19.192 days (2020-Jan-05.24158 to 2020-Jan-24.433105). Diameter approximately 0.032 km. from weighted mean H=25.15.
NEODyS1630210311.82e-07-7.22-7.220NEODyS: "Based on 108 optical observations (of which 4 are rejected as outliers) from 2020-01-05.242 to 2020-01-24.434."
2019 YW2JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1413 UTC today
NEODyS16302115-211724.4e-10-9.20-9.210NEODyS: "Based on 140 optical observations (of which 8 are rejected as outliers) from 2019-12-24.514 to 2020-01-24.449."
2019 XO3JPL Sentry0200R E M O V E DJPL: Risk listing removed at 0058 UTC today

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 January '20

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

2332Noted that JPL Sentry has posted 2020 BC8 as an impact risk - see above
Noted that JPL Sentry has posted 2020 BD8 as an impact risk - see above
2310Generated Traffic Report
2230Grabbed MPEC 2020-B172 - 2020 BC8 - see above
Grabbed MPEC 2020-B173 - 2020 BD8 - see above
Grabbed MPEC 2020-B174 - 2020 BE8 - see above
2200Grabbed MPEC 2020-B169 - 2020 BZ7 - see above
Grabbed MPEC 2020-B170 - 2020 BA8 - see above
Grabbed MPEC 2020-B171 - 2020 BB8 - see above
2132Noted that NEODyS has posted 2020 BH7 as an impact risk - see above
Grabbed MPEC 2020-B163 - 2020 BS7 - see above
Grabbed MPEC 2020-B164 - 2020 BV7 - see above
Grabbed MPEC 2020-B165 - 2020 BW7 - see above
Grabbed MPEC 2020-B166 - 2020 BX7 - see above
Grabbed MPEC 2020-B167 - 2020 BY7 - see above
Grabbed MPEC 2020-B168 - 2009 CE - see above
2030Grabbed MPEC 2020-B162 - 2020 BR7 - see above
1930Grabbed MPEC 2020-B155 - 2020 BK7 - see above
Grabbed MPEC 2020-B156 - 2020 BL7 - see above
Grabbed MPEC 2020-B157 - 2020 BM7 - see above
Grabbed MPEC 2020-B158 - 2020 BN7 - see above
Grabbed MPEC 2020-B159 - 2020 BO7 - see above
Grabbed MPEC 2020-B160 - 2020 BP7 - see above
Grabbed MPEC 2020-B161 - 2020 BQ7 - see above
1900Noted that JPL Sentry has posted 2020 BH7 as an impact risk - see above
Grabbed MPEC 2020-B154 - 2020 BJ7 - see above
1801Grabbed MPEC 2020-B153 - 2020 BH7 - see above
1630Noted that JPL Sentry has removed 2019 YW2 as an impact risk - see above
Noted that NEODyS has updated its 2019 YW2 risk assessment - see above
Noted that JPL Sentry has updated its 2020 AY1 risk assessment - see above
Noted that NEODyS has updated its 2020 AY1 risk assessment - see above
Noted that JPL Sentry has removed 2020 BB as an impact risk - see above
Noted that NEODyS has updated its 2020 BB risk assessment - see above
Noted that JPL Sentry has updated its 2020 BB5 risk assessment - see above
Noted that NEODyS has updated its 2020 BB5 risk assessment - see above
Noted that JPL Sentry has removed 2020 BF1 as an impact risk - see above
Noted that JPL Sentry has updated its 2020 BH risk assessment - see above
Noted that NEODyS has updated its 2020 BH risk assessment - see above
Noted that JPL Sentry has updated its 2020 BH3 risk assessment - see above
Noted that NEODyS has updated its 2020 BH3 risk assessment - see above
Noted that NEODyS has removed 2020 BJ4 as an impact risk - see above
Noted that JPL Sentry has updated its 2020 BK3 risk assessment - see above
Noted that NEODyS has updated its 2020 BK3 risk assessment - see above
Noted that JPL Sentry has updated its 2020 BW5 risk assessment - see above
Noted that NEODyS has posted 2020 BW5 as an impact risk - see above
Noted that JPL Sentry has updated its 2020 BY1 risk assessment - see above
Noted that NEODyS has updated its 2020 BY1 risk assessment - see above
Noted that JPL Sentry has updated its 2020 BY4 risk assessment - see above
Noted that NEODyS has updated its 2020 BY4 risk assessment - see above
Grabbed MPEC 2020-B148 - Daily Orbit Update - see above
Grabbed MPEC 2020-B149 - 2020 BB7 - see above
Grabbed MPEC 2020-B150 - 2020 BC7 - see above
Grabbed MPEC 2020-B151 - 2020 BD7 - see above
Grabbed MPEC 2020-B152 - 2019 YG7 - see above
0430Grabbed MPEC 2020-B145 - 2020 BX6 - see above
Grabbed MPEC 2020-B146 - 2020 BY6 - see above
Grabbed MPEC 2020-B147 - 2020 BZ6 - see above
0225Noted Radar Astrometry database update - see above
0200Noted that JPL Sentry has removed 2019 XO3 as an impact risk - see above
Noted Radar Astrometry database update - see above