Contents  on 5 February '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.

NEOCP Activity  on 5 February '20

The MPC's NEO Confirmation Page has 54 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 54 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 71 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 5 February '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.


<< OOC on 5 February '20 -- MPEC 2020-C98 - "20:39 UT" - Observations and Orbits of Comets and A/ Objects


MPEC 2020-C97 - "20:25 UT" - 2020 CL1


<< DOU on 5 February '20 >>  MPEC 2020-C96 - "12:33 UT" - Daily Orbit Update


MPEC 2020-C95 - "07:50 UT" - 2020 CK1


MPEC 2020-C94 - "06:22 UT" - 2020 CJ1


MPEC 2020-C93 - "05:04 UT" - 2020 CH1


MPEC 2020-C92 - "04:58 UT" - 2020 CG1


MPEC 2020-C91 - "01:09 UT" - 2020 CF1


MPEC 2020-C90 - "01:06 UT" - 2020 CE1

Observers  on 5 February '20

A total of 109 observers appear in today's MPECs.

CodeObserver / observatory
L2729PREMOTE Obs., 7 in MPEC 2020-C98 -- C/2016 M1, 384P, 155P, 114P, 2I, 29P, 7P
349Ageo Obs. in Japan, 6 in MPEC 2020-C98 -- 384P, 289P, 260P, 112P, 78P, 29P
C97Al-Fulaij Obs., 14 in MPECs 2020-C96 & 2020-C98 -- 2019 XG1, 2015 DE200, 2003 OC3, 52768, 492143, 448818, 416591, 333555, 18172, 159454, 137199, 103067, 1866, 114P
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2020-C91 & 2020-C96 -- 2020 CF1, 2020 BX13, 2020 BT8, 2020 BT1, 2020 BO1, 2020 BH15, 2020 BD12, 2019 WB6, 2018 LK, 52768, 458964, 163373, 103067, 5626, 1627
T05ATLAS Haleakala in Hawaii, 48 in MPECs 2020-C96 & 2020-C98 -- 2020 BE2, 2020 BD13, 2019 WB6, C/2019 T4, C/2019 F1, 2017 BP32, C/2016 M1, 2016 AX147, 2015 DE200, C/2014 B1, 2011 CT4, 86067, 512245, 511684, 438452, 374188, 35107, 34613, 30825, 214088, 163373, 162038, 153267, 5693, 5626, 1864, 1627, 289P, 266P, 260P, 246P, 228P, 203P, 173P, 160P, 159P, 155P, 124P, 117P, 114P, 112P, 101P, 88P, 78P, 76P, 68P, 31P, 29P
T08ATLAS Mauna Loa in Hawaii, 42 in MPECs 2020-C96 & 2020-C98 -- 2020 BX14, 2019 UO, 2019 U6, C/2019 T4, C/2019 T3, C/2019 C1, C/2018 N2, 2017 XD, C/2017 T2, C/2016 M1, C/2010 U3, 2006 DY, 2003 OC3, 504074, 437316, 349063, 143527, 384P, 289P, 266P, 260P, 246P, 228P, 203P, 173P, 159P, 155P, 137P, 124P, 117P, 114P, 112P, 101P, 99P, 88P, 78P, 76P, 68P, 31P, 2I, 29P, 28P
L54Berthelot Obs., 3 in MPEC 2020-C98 -- 260P, 2I, 29P
C86Blanes Obs. in Spain, 2 in MPEC 2020-C98 -- 260P, 114P
G20Brignoles Obs., 14 in MPEC 2020-C98 -- C/2018 W2, C/2018 N2, C/2018 DO4, C/2017 T2, C/2017 K2, 260P, 246P, 155P, 114P, 101P, 88P, 78P, 2I, 29P
B96Brixiis Obs. in Belgium, 7 in MPEC 2020-C98 -- 260P, 203P, 124P, 114P, 101P, 76P, 29P
K47BSCR Obs., 4 in MPEC 2020-C98 -- 260P, 155P, 114P, 78P
215Buchloe Obs. in Germany, 10 in MPEC 2020-C98 -- 392P, 386P, 384P, 289P, 160P, 155P, 112P, 78P, 76P, 36P
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2020-C98 -- 164P
Z36Cancelada Obs., 3 in MPEC 2020-C98 -- 260P, 114P, 29P
I72Carpe Noctem Obs. in Spain, 5 in MPEC 2020-C98 -- C/2018 N2, C/2017 T2, 260P, 114P, 29P
160Castelmartini Obs. in Italy, 15 in MPECs 2020-C96 & 2020-C98 -- 2020 BX12, 2015 DE200, 511684, 374188, 163373, 138013, 260P, 155P, 114P, 112P, 78P, 76P, 68P, 2I, 29P
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2020-C96, 2020-C97 & 2020-C98 -- 2020 CL1, 2020 BW14, C/2015 O1, 289P, 266P, 228P, 137P, 124P, 114P, 112P, 101P, 99P, 87P, 78P, 76P
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 5 in MPEC 2020-C96 -- 2020 CF1, 2020 BR11, 2020 BG10, 2020 BC5, 2016 EE156
107Cavezzo Obs. in Italy, 2 in MPEC 2020-C98 -- 46P, 38P
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 20 in MPECs 2020-C92, 2020-C96 & 2020-C97 -- 2020 CL1, 2020 CJ1, 2020 CG1, 2020 BU8, 2020 BR13, 2020 BP13, 2020 BO9, 2020 BO3, 2020 BN8, 2020 BN10, 2020 BH2, 2020 BG6, 2020 BC9, 2020 BC6, 2020 BB3, 2020 BA4, 2020 BA12, 2020 AN3, 2019 XB2, 2019 WR3
A77Chante-Perdrix Obs. in France, 19 in MPEC 2020-C98 -- C/2020 A2, P/2019 Y2, C/2019 F1, C/2017 T2, 392P, 390P, 289P, 266P, 260P, 246P, 155P, 124P, 114P, 88P, 36P, 2I, 9P, 7P, 2P
970Chelmsford Obs. in England, 1 in MPEC 2020-C98 -- 289P
W76ChileScope Obs., 2 in MPEC 2020-C98 -- 2I, 29P
J01Cielo Profundo Obs. in Spain, 3 in MPEC 2020-C98 -- 155P, 114P, 2I
850Cordell-Lorenz Obs. in Tennessee, 5 in MPEC 2020-C98 -- C/2019 Y4, 246P, 155P, 114P, 76P
B50Corner Obs. in Germany, 3 in MPEC 2020-C98 -- C/2017 T2, 68P, 29P
Z39Costa Teguise Obs. in the Canary Islands, 1 in MPEC 2020-C98 -- 29P
V16Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2020-C98 -- 29P
W842program code 2 via DECam in Chile, 8 in MPEC 2020-C98 -- C/2018 L2, C/2018 A6, P/2018 A5, P/2017 R1, C/2017 M3, C/2017 D3, P/2017 D1, C/2017 B3
K77EHB01 Obs., 5 in MPEC 2020-C98 -- 390P, 289P, 160P, 112P, 99P
Z40El Manzanillo Obs., 1 in MPEC 2020-C98 -- 260P
006Fabra Obs. in Spain, 4 in MPEC 2020-C96 -- 18172, 163373, 137199, 103067
W46Foxfire Village Obs., 1 in MPEC 2020-C98 -- 114P
372Geisei Obs. in Japan, 1 in MPEC 2020-C98 -- 289P
190Gissar Obs. in Tajikistan, 1 in MPEC 2020-C98 -- 29P
U76Glendora Obs., 2 in MPEC 2020-C98 -- 68P, 46P
Z30Glyn Marsh Obs., 5 in MPEC 2020-C98 -- 260P, 155P, 114P, 78P, 29P
J95Great Shefford Obs. in England, 4 in MPECs 2020-C93 & 2020-C96 -- 2020 CR, 2020 CH1, 2020 BY13, 2020 BF10
134Groszschwabhausen Obs. in Germany, 1 in MPEC 2020-C98 -- 260P
458Guadarrama Obs. in Spain, 1 in MPEC 2020-C98 -- C/2017 T2
D88Hiratsuka Obs. in Japan, 5 in MPEC 2020-C98 -- 260P, 173P, 114P, 101P, 78P
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 17 in MPEC 2020-C98 -- 2020 B1, P/2019 Y3, 2019 G2, 392P, 390P, 388P, 384P, 289P, 261P, 260P, 160P, 159P, 112P, 78P, 76P, 68P, 29P
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2020-C98 -- C/2019 F1
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 4 in MPEC 2020-C98 -- 2020 A1, 2019 K6, 87P, 2I
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2020-C98 -- 2I
Q24Katori Obs. in Japan, 1 in MPEC 2020-C98 -- C/2020 A2
585Kiev Comet Station in Ukraine, 11 in MPEC 2020-C98 -- C/2018 N2, C/2018 A3, C/2017 T2, 266P, 261P, 260P, 114P, 101P, 78P, 2I, 29P
C401program code 1 via Kuban State Univ. Obs. in Russia, 2 in MPEC 2020-C96 -- 52768, 163373
D95Kurihara Obs. in Japan, 8 in MPEC 2020-C98 -- 384P, 203P, 155P, 124P, 99P, 78P, 76P, 2I
212La Dehesilla Obs. in Spain, 5 in MPEC 2020-C98 -- 260P, 160P, 114P, 101P, 29P
J38La Vara Obs. in Spain, 4 in MPEC 2020-C98 -- 260P, 114P, 76P, 29P
304Las Campanas Obs. in Chile, 1 in MPEC 2020-C98 -- 2I
W85LCO Cerro Tololo A in Chile, 2 in MPECs 2020-C96 & 2020-C97 -- 2020 CL1, 2020 BR10
V37LCO McDonald Obs. in Texas, 2 in MPEC 2020-C98 -- 289P, 29P
Q63LCO Siding Spring A in New South Wales, 1 in MPEC 2020-C98 -- 155P
K93LCO Sutherland C in South Africa, 1 in MPEC 2020-C98 -- 155P
130Lumezzane Obs. in Italy, 1 in MPEC 2020-C98 -- 76P
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2020-C90, 2020-C91, 2020-C95 & 2020-C97 -- 2020 CL1, 2020 CK1, 2020 CF1, 2020 CE1
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2020-C94 -- 2020 CJ1
568_Marco Micheli on Mauna Kea in Hawaii, 5 in MPEC 2020-C98 -- 2020 B1, C/2019 K8, 2019 K6, 2019 G4, 2018 V3
213Montcabre Obs. in Spain, 2 in MPEC 2020-C98 -- 114P, 29P
G96Mt. Lemmon Survey (MLS) in Arizona, 33 in MPECs 2020-C90, 2020-C91, 2020-C92, 2020-C93, 2020-C95 & 2020-C98 -- 2020 CK1, 2020 CH1, 2020 CG1, 2020 CF1, 2020 CE1, P/2019 V2, C/2019 A5, C/2018 P5, C/2015 O1, 392P, 317P, 302P, 266P, 261P, 258P, 243P, 228P, 223P, 163P, 155P, 137P, 117P, 114P, 112P, 99P, 88P, 87P, 78P, 65P, 47P, 22P, 21P, 7P
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2020-C98 -- 2I
J69North Obs. in England, 1 in MPEC 2020-C96 -- 163373
Z80Northolt Branch Obs. in England, 6 in MPEC 2020-C96 -- 2020 CC, 2020 BL13, 2020 BD13, 2017 BP32, 2015 DE200, 163373
C23Olmen Obs. in Belgium, 16 in MPEC 2020-C98 -- 384P, 289P, 266P, 260P, 203P, 160P, 159P, 155P, 124P, 114P, 101P, 78P, 76P, 68P, 29P, 7P
L36Ondrejov BlueEye600 Telescope in the Czech Republic, 5 in MPEC 2020-C98 -- C/2018 W2, C/2018 N2, 260P, 68P, 29P
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2020-C98 -- 203P, 114P
B69Owls & Ravens Obs. in Germany, 2 in MPEC 2020-C98 -- 114P, 29P
F51Pan-STARRS 1 (PS1) in Hawaii, 35 in MPECs 2020-C94, 2020-C95, 2020-C96 & 2020-C98 -- 2020 CK1, 2020 CJ1, 2020 CF1, C/2011 KP36, C/2010 M1, 458452, 39796, 26760, 143381, 103067, 387P, 317P, 302P, 289P, 266P, 261P, 258P, 249P, 243P, 228P, 223P, 163P, 137P, 131P, 117P, 101P, 99P, 91P, 78P, 76P, 47P, 31P, 22P, 21P, 7P
F52Pan-STARRS 2 (PS2) in Hawaii, 30 in MPECs 2020-C94, 2020-C96 & 2020-C98 -- 2020 CJ1, 2020 CF1, 2019 XL1, 2004 BZ74, 90075, 455322, 428223, 374188, 154652, 12923, 106589, 386P, 384P, 266P, 260P, 249P, 223P, 203P, 159P, 137P, 131P, 101P, 99P, 88P, 87P, 78P, 47P, 31P, 14P, 10P
W95Panamanian San Pedro Atacama Obs. in Chile, 1 in MPEC 2020-C98 -- 115P
K63Pascoli Obs. in Italy, 2 in MPECs 2020-C93 & 2020-C96 -- 2020 CH1, 34613
323Perth Obs. in Western Australia, 2 in MPEC 2020-C98 -- 2019 U6, 2I
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2020-C98 -- 29P
654Pomona College Table Mtn. Obs. (PCTMO) in southern California, 2 in MPEC 2020-C96 -- 2020 BE8, 2020 BD13
X03SADR Obs., 2 in MPEC 2020-C98 -- C/2018 F4, 117P
B56Sant Pere Obs. in Spain, 4 in MPEC 2020-C98 -- C/2018 N2, C/2017 T2, 260P, 29P
A29Santa Maria a Monte Obs. in Italy, 2 in MPEC 2020-C98 -- 260P, 2I
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPEC 2020-C98 -- C/2017 T2, 76P
C95SATINO-1 in France, 5 in MPECs 2020-C96 & 2020-C98 -- 2003 OC3, 260P, 114P, 112P, 88P
204Schiaparelli Obs. in Italy, 9 in MPEC 2020-C98 -- 203P, 155P, 124P, 114P, 112P, 78P, 76P, 2I, 29P
Q11Shinshiro Obs., 16 in MPEC 2020-C98 -- 385P, 384P, 289P, 266P, 261P, 260P, 228P, 160P, 112P, 101P, 88P, 78P, 76P, 31P, 2I, 29P
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-C98 -- 124P
G402program code 2 via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-C98 -- 2I
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2020-C98 -- 289P, 246P
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 2 in MPEC 2020-C98 -- 2019 U6, C/2019 C1
587Sormano Obs. in Italy, 1 in MPEC 2020-C98 -- 2I
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2020-C98 -- C/2012 F3
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2020-C96, 2020-C97 & 2020-C98 -- 2020 CL1, 2020 CG, 2020 BW5, 2020 BU1, 2020 BP15, 2020 BA4, 2020 B1
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2020-C96 -- 2020 BW14, 2020 BW13, 2020 BW, 2020 BQ1, 2020 BG1, 2020 BC6
C36Starry Wanderer Obs. in Belarus, 3 in MPEC 2020-C98 -- C/2017 T2, 260P, 114P
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2020-C90, 2020-C92, 2020-C93, 2020-C96 & 2020-C97 -- 2020 CX, 2020 CL1, 2020 CJ, 2020 CH1, 2020 CH, 2020 CG1, 2020 CG, 2020 CE1, 2020 BZ14, 2020 BY13, 2020 BW5, 2020 BV13, 2020 BS2, 2020 BS12, 2020 BP12, 2020 BL7, 2020 BJ9, 2020 BF11, 2020 BE9, 2020 BD13, 2020 BB15
A71Stixendorf Obs. in Austria, 5 in MPEC 2020-C98 -- 289P, 124P, 114P, 112P, 78P
Q23Sukagawa Obs., 2 in MPEC 2020-C98 -- C/2020 A2, 155P
Q38Swan Hill Obs., 1 in MPEC 2020-C98 -- 101P
461SZTE Asteroid Program in Hungary, 1 in MPEC 2020-C98 -- 258P
J22Tacande Obs. in the Canary Islands, 29 in MPEC 2020-C98 -- C/2019 T4, C/2019 K8, C/2019 F1, C/2017 K2, C/2016 M1, C/2015 O1, 385P, 289P, 266P, 261P, 260P, 246P, 228P, 203P, 173P, 159P, 155P, 135P, 124P, 117P, 114P, 112P, 101P, 88P, 87P, 78P, 76P, 2I, 29P
I81Tarbatness Obs. in Scotland, 17 in MPEC 2020-C98 -- C/2019 N1, C/2018 N2, C/2017 T2, C/2017 K2, C/2010 U3, 289P, 260P, 246P, 159P, 155P, 124P, 114P, 99P, 78P, 76P, 29P, 7P
C35Terrassa Obs. in Spain, 3 in MPEC 2020-C98 -- C/2017 T2, C/2016 M1, 114P
C57TESS in Earth orbit, 2 in MPEC 2020-C98 -- C/2019 N1, C/2010 U3
W33Transit Dreams Obs., 1 in MPEC 2020-C98 -- 38P
V26UAS-ISON Obs., 1 in MPEC 2020-C98 -- 2I
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2020-C96 -- 2019 YP3, 2019 SJ8
Z55Uraniborg Obs., 1 in MPEC 2020-C98 -- C/2017 T2
H47Vicksburg Obs. in Mississippi, 4 in MPEC 2020-C98 -- C/2019 F1, 384P, 246P, 155P
L01Visnjan Obs., 6 in MPECs 2020-C90, 2020-C91, 2020-C92, 2020-C93, 2020-C94 & 2020-C97 -- 2020 CL1, 2020 CJ1, 2020 CH1, 2020 CG1, 2020 CF1, 2020 CE1
G23Vulpecula Obs., 2 in MPEC 2020-C98 -- C/2018 N2, C/2017 T2
Z92West Park Obs. in England, 2 in MPECs 2020-C96 & 2020-C98 -- C/2017 T2, 163373
C51WISE in Earth polar orbit, 5 in MPEC 2020-C98 -- C/2017 T2, 266P, 260P, 114P, 2I
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2020-C98 -- 289P, 114P, 76P
367Yatsuka Obs. in Japan, 9 in MPEC 2020-C98 -- C/2020 A2, C/2018 N2, C/2017 T2, C/2017 B3, 260P, 114P, 101P, 2I, 29P
Z57Zuben Obs., 4 in MPEC 2020-C98 -- 289P, 266P, 260P, 114P
I41Zwicky Transient Facility (ZTF) in southern California, 12 in MPEC 2020-C96 -- 2020 BE2, 2019 YG7, 2019 XG1, 2011 CT4, 2004 MD, 2004 CH52, 511243, 482244, 455322, 438452, 34613, 136993
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 February '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 CE1NEODyS16352095-211436.31e-06-5.69-5.960NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2020-02-02.153 to 2020-02-04.964."
JPL Sentry03062095-209524.999e-06-5.77-6.050JPL: Computed at 18:27 Feb. 4th Pacific time based on 20 observations spanning 2.8102 days (2020-Feb-02.15265 to 2020-Feb-04.962853). Diameter approximately 0.024 km. from weighted mean H=25.79.
2020 CJJPL Sentry1635R E M O V E DJPL: Risk listing removed at 1420 UTC today
NEODyS1635R E M O V E D-
2020 BP15JPL Sentry1635R E M O V E DJPL: Risk listing removed at 1416 UTC today
NEODyS1635R E M O V E D-
2020 BH15NEODyS1635210211.1e-10-11.09-11.090NEODyS: "Based on 25 optical observations (of which 2 are rejected as outliers) from 2020-01-27.481 to 2020-02-03.267."
2020 BW14JPL Sentry16352033-2118144.7570236e-06-1.91-2.040JPL: Computed at 06:17 today Pacific time based on 80 observations spanning 11.007 days (2020-Jan-25.090825 to 2020-Feb-05.09763). Diameter approximately 0.719 km. from weighted mean H=18.36.
NEODyS16352046-2118137.67e-06-1.66-1.741NEODyS: "Based on 80 optical observations (of which 1 are rejected as outliers) from 2020-01-25.092 to 2020-02-05.098."
2020 BW13JPL Sentry16352084-208419.910e-08-8.46-8.460JPL: Computed at 06:04 today Pacific time based on 20 observations spanning 12.802 days (2020-Jan-23.537363 to 2020-Feb-05.33899). Diameter approximately 0.012 km. from weighted mean H=27.29.
NEODyS16352074-209332.25e-08-9.11-9.170NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2020-01-23.538 to 2020-02-05.340."
2020 BP12JPL Sentry1635R E M O V E DJPL: Risk listing removed at 1414 UTC today
2020 BW5JPL Sentry16352046-2110102.269364e-05-5.19-5.240JPL: Computed at 06:04 today Pacific time based on 62 observations spanning 13.894 days (2020-Jan-22.516545 to 2020-Feb-05.41076). Diameter approximately 0.018 km. from weighted mean H=26.41.
NEODyS16352046-2113171.95e-05-5.27-5.320NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2020-01-22.517 to 2020-02-05.412."
2020 AN3JPL Sentry16352106-210614.512e-07-4.21-4.210JPL: Computed at 05:59 today Pacific time based on 135 observations spanning 87.034 days (2019-Nov-09.147003 to 2020-Feb-04.18054). Diameter approximately 0.280 km. from weighted mean H=20.39.
NEODyS1635210617.94e-07-3.98-3.980NEODyS: "Based on 144 optical observations (of which 3 are rejected as outliers) from 2019-11-09.148 to 2020-02-04.181."
2019 YP3NEODyS1635R E M O V E D-

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 5 February '20

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

2103Grabbed MPEC 2020-C97 - 2020 CL1 - see above
Grabbed MPEC 2020-C98 - Observations and Orbits of Comets and A/ Objects - see above
1635Noted that NEODyS has removed 2019 YP3 as an impact risk - see above
Noted that JPL Sentry has updated its 2020 AN3 risk assessment - see above
Noted that NEODyS has updated its 2020 AN3 risk assessment - see above
Noted that NEODyS has updated its 2020 BH15 risk assessment - see above
Noted that JPL Sentry has removed 2020 BP12 as an impact risk - see above
Noted that JPL Sentry has removed 2020 BP15 as an impact risk - see above
Noted that NEODyS has removed 2020 BP15 as an impact risk - see above
Noted that JPL Sentry has updated its 2020 BW13 risk assessment - see above
Noted that NEODyS has reposted 2020 BW13 as an impact risk - see above
Noted that JPL Sentry has updated its 2020 BW14 risk assessment - see above
Noted that NEODyS has updated its 2020 BW14 risk assessment - see above
Noted that JPL Sentry has updated its 2020 BW5 risk assessment - see above
Noted that NEODyS has updated its 2020 BW5 risk assessment - see above
Noted that NEODyS has posted 2020 CE1 as an impact risk - see above
Noted that JPL Sentry has removed 2020 CJ as an impact risk - see above
Noted that NEODyS has removed 2020 CJ as an impact risk - see above
Grabbed MPEC 2020-C94 - 2020 CJ1 - see above
Grabbed MPEC 2020-C95 - 2020 CK1 - see above
Grabbed MPEC 2020-C96 - Daily Orbit Update - see above
0607Grabbed MPEC 2020-C93 - 2020 CH1 - see above
0500Grabbed MPEC 2020-C92 - 2020 CG1 - see above
0306Noted that JPL Sentry has posted 2020 CE1 as an impact risk - see above
0134Grabbed MPEC 2020-C90 - 2020 CE1 - see above
Grabbed MPEC 2020-C91 - 2020 CF1 - see above