2020-03-28 Tracking News

Contents on 28 March '20

IAU Minor Planet Center
- NEOCP Activity -- 19 listings
- New MPECs -- eight MPECs
Observers -- 37 observers
Impact Risk Monitoring -- four objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1109 risk-listed objects, 94 have had news in the last 31 days. Updated at 1700 UTC on 28 March.
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 28 March '20

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 28 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 28 March '20

Minor Planet Electronic Circulars

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

MPEC 2020-F168 time-stamped "01:29 UT" - Comet C/2019 S4 (Lemmon) - see below
MPEC 2020-F169 time-stamped "06:00 UT" - 2020 FE6 - see below
MPEC 2020-F170 time-stamped "06:01 UT" - 2020 FF6 - see below
MPEC 2020-F171 time-stamped "06:03 UT" - 2020 FG6 - see below
MPEC 2020-F172 time-stamped "06:05 UT" - 2020 FH6 - see below
MPEC 2020-F173 time-stamped "06:06 UT" - 2020 FJ6 - see below
MPEC 2020-F174 time-stamped "06:09 UT" - 2020 FK6 - see below
MPEC 2020-F175 time-stamped "12:09 UT" - Daily Orbit Update

<< DOU on 28 March '20 >> MPEC 2020-F175 - "12:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K20F03R 2020 FR3 (arc=6 days, H=20.7 ~245m) from Great Shefford Obs. (March 27.87-90p3)
K20F03N 2020 FN3 (small asteroid, arc=6 days, H=24.4 ~45m, NHATS target) from Great Shefford Obs. (March 27.92-96p2)
K20F01M 2020 FM1 (small asteroid, arc=8 days, H=29.3 ~5m, close passer, NHATS target) from UH/Tholen NEO Follow-Up 2.24m Telescope (March 24.43-44p2 at G=23.10-14)
Observations of recently (no longer) risk-listed objects
K20F02E 2020 FE2 (small asteroid, arc=10 days, H=25.9 ~22m, close passer) from Astronomical Research Obs. Westfield (March 26.11p4), Irydeo Obs. (March 26.90p3), Dettelbach Vineyard Obs. (March 27.92-96p4), and Great Shefford Obs. (March 28.09p4)
Observations of close-passing objects
K20F05W 2020 FW5 (arc=3 days, H=25.7 ~25m) from Great Shefford Obs. (March 28.10p3)
K20F04V 2020 FV4 (arc=3 days, H=25.4 ~28m) from Dettelbach Vineyard Obs. (March 27.83-85p3)
K20F04K 2020 FK4 (arc=4 days, H=27.5 ~11m, NHATS target) from Great Shefford Obs. (March 28.09-10p3)
K20F02W 2020 FW2 (arc=18 days, H=24.1 ~51m) from Guidestar Obs. (March 28.06-07p3) and Dettelbach Vineyard Obs. (March 28.11-12p3)
K20F02M 2020 FM2 (arc=3 days, H=26.3 ~19m) from ATLAS Haleakala (March 23.51-54p5 & 23.60-63p6)
K20F00B 2020 FB (arc=12 days, H=25.4 ~28m, NHATS target) from Dettelbach Vineyard Obs. (March 28.02-03p3)
c8945 388945 2008 TZ3 from Tentlingen Obs. (March 27.07-11p5)
Observation campaigns (NHATS targets, radar support)
K11G60D 2011 GD60 (arc=3 opp, H=21.8 ~148m, NHATS) from Schwarzschild Obs. (March 27.85p3)
-- NHATS target table
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20F02V 2020 FV2 (arc=7 days, H=22.2 ~123m) from Dettelbach Vineyard Obs. (March 27.90-91p3)
K20F02T 2020 FT2 (arc=6 days, H=23.1 ~81m) from Gisborne Obs. (March 27.51-54p5)
K20F02O 2020 FO2 (arc=62 days, H=22.4 ~112m) from ARO Westfield (March 26.13-14p3) and Dettelbach Vineyard Obs. (March 27.86-88p3)
K20F01N 2020 FN1 (arc=12 days, H=22.7 ~98m) from Guidestar Obs. (March 27.99-01p3) and Dettelbach Vineyard Obs. (March 27.99-01p3)
K19Y00A 2019 YA (arc=80 days, H=21.8 ~148m) from SATINO-1 (2019 Dec. 24.99p3)
K15F35C 2015 FC35 (arc=3 opp, H=22.0 ~135m) from M. Kumrucu-Lohmiller via Slooh.com Chile Obs. (March 27.20-24p5), program code 1 via Kitab Obs. (March 27.93p4), and Schwarzschild Obs. (March 27.96p3)
Observations of other objects
K20F05R 2020 FR5 (arc=4 days, H=21.1 ~204m) from Guidestar Obs. (March 28.08-11p3)
K20F04X 2020 FX4 (arc=146 days, H=21.7 ~155m) from Dettelbach Vineyard Obs. (March 27.80-82p3)
K20F04W 2020 FW4 (arc=4 days, H=21.7 ~155m) from Steward Obs. Mt. Lemmon Station (March 27.50-51p3) and Dettelbach Vineyard Obs. (March 27.97-98p3)
K20F01S 2020 FS1 (arc=9 days, H=21.1 ~204m) from ARO Westfield (March 26.14p3)
K20E00M 2020 EM (arc=22 days, H=19.8 ~371m) from Schwarzschild Obs. (March 27.96p3)
K20E00H 2020 EH (i=45.0°, arc=21 days, H=21.0 ~214m) from Castelmartini Obs. (March 23.99-00p3)
K20D04M 2020 DM4 (arc=29 days, H=21.7 ~155m) from ARO Westfield (March 26.17-18p3) and Tentlingen Obs. (March 26.96-98p4)
K20D03T 2020 DT3 (arc=39 days, H=21.3 ~186m) from Castelmartini Obs. (March 23.92-93p3), ARO Westfield (March 26.11p4), Tentlingen Obs. (March 26.87-90p4), and Foxfire Village Obs. (March 27.06-07p3)
K20D00X 2020 DX (arc=40 days, H=20.0 ~339m) from ARO Westfield (March 26.12p3) and Guidestar Obs. (March 27.84-87p3)
K20B05O 2020 BO5 (arc=67 days, H=21.0 ~214m) from Gisborne Obs. (March 27.46-51p9)
K20A02Z 2020 AZ2 (arc=82 days, H=21.3 ~186m) from Gisborne Obs. (March 27.46-48p4) and Guidestar Obs. (March 27.92-93p3)
K19X01G 2019 XG1 (Q=4.163 AU, arc=2 opp, H=19.2 ~490m) from Castelmartini Obs. (March 23.98p3)
K19W06B 2019 WB6 (arc=123 days, H=20.6 ~257m) from Guidestar Obs. (March 27.88-91p3)
K19U09T 2019 UT9 (arc=162 days, H=18.6 ~645m) from Clixby Obs. (March 27.90-91p5) and Guidestar Obs. (March 28.02-05p3)
K19S10N 2019 SN10 (arc=208 days, H=21.3 ~186m) from ARO Westfield (March 26.12-13p5)
K19S06H 2019 SH6 (arc=2 opp, H=20.0 ~339m) from Guidestar Obs. (March 27.95-97p3)
K17F90E 2017 FE90 (arc=3 opp, H=19.5 ~426m) from Schwarzschild Obs. (March 27.99p3)
K17D37Q 2017 DQ37 (arc=2 opp, H=19.0 ~537m) from Schwarzschild Obs. (March 27.86-87p3)
K17B94B 2017 BB94 (arc=3 opp, H=20.3 ~295m) from Schwarzschild Obs. (March 27.98-99p3)
K17B31P 2017 BP31 (arc=3 opp, H=19.8 ~371m) from Schwarzschild Obs. (March 27.79p4)
K16W01E 2016 WE1 (arc=4 opp, H=19.6 ~407m) from Schwarzschild Obs. (March 27.80p4)
K16F15G 2016 FG15 (Q=4.232 AU, arc=3 opp, H=19.9 ~355m) from Schwarzschild Obs. (March 27.80-81p4)
K16EF7E 2016 EE157 (arc=3 opp, H=20.8 ~234m) from Schwarzschild Obs. (March 27.86p3)
K16EF6E 2016 EE156 (Q=4.660 AU, arc=3 opp, H=17.9 ~891m) from Schwarzschild Obs. (March 27.95-96p3)
K13A27O 2013 AO27 (q=0.292 AU, Q=4.531 AU, arc=2 opp, H=19.8 ~371m) from W.F. Cashwell via Slooh.com Chile Obs. (March 25.35-39p3)
K10U07E 2010 UE7 (arc=4 opp, H=19.2 ~490m) from Castelmartini Obs. (March 23.97-98p3)
K08F00G 2008 FG (i=39.4°, arc=3 opp, H=19.8 ~371m) from Schwarzschild Obs. (March 27.87-88p3)
K01G02S 2001 GS2 (arc=3 opp, H=20.4 ~282m) from Castelmartini Obs. (March 24.06-07p3)
n2143 492143 2013 OE from Tentlingen Obs. (March 26.82-86p3)
i8818 448818 2011 UU20 from Castelmartini Obs. (March 23.90-91p3)
e1857 401857 2000 PG3 from WISE (March 25.34p1, 25.48p1, 25.54p1, 25.61p1, 25.74p1, 25.80p1, 25.87p1 & 25.93p1)
R6732 276732 2004 EV9 from Castelmartini Obs. (March 23.89p3)
F4555 154555 2003 HA from Castelmartini Obs. (March 24.16p2)
D7064 137064 1998 WP5 from Castelmartini Obs. (March 24.11p3)
90075 90075 2002 VU94 from WISE (March 25.63p1, 25.76p1, 26.02p1, 26.22p1 & 26.35p2)
85628 85628 1998 KV2 from Castelmartini Obs. (March 24.12p3)
65690 65690 1991 DG from Castelmartini Obs. (March 23.93-94p3)
54686 54686 2001 DU8 from Castelmartini Obs. (March 23.99p3)
52768 52768 1998 OR2 from Castelmartini Obs. (March 23.88p3), program code 1 via Kuban State Univ. Obs. (March 27.73-78p38 & 27.88-93p34), and West Park Obs. (March 27.83-88p4)
35107 35107 1991 VH from Castelmartini Obs. (March 23.94p3)
18882 18882 1999 YN4 from WISE (March 26.72p1, 26.79p1, 26.86p1, 26.92p1 & 26.99p1)
18172 18172 2000 QL7 from Castelmartini Obs. (March 23.90p2)
09400 9400 1994 TW1 from Landehen Obs. (March 26.87-90p5)
07088 7088 Ishtar (1992 AA) from Tentlingen Obs. (March 27.01-05p4)
04954 4954 Eric (1990 SQ) from Campo dos Amarais Obs. (March 27.30-32p3)

MPEC 2020-F174 - "06:09 UT" - 2020 FK6

K20F06K 2020 FK6 (risk listed, Earth MOID=0.5 LD, H=28.1 ~8m, close passer) was picked up at 0641 UT on 16 March by the Mt. Lemmon Survey (MLS), observing it at March 16.28-30p4. This detection was confirmed by Steward Mt. Lemmon Sta. (March 16.40-41p3) and Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (March 17.12-13p3).

MPEC 2020-F173 - "06:06 UT" - 2020 FJ6

K20F06J 2020 FJ6 (Q=4.601 AU, H=19.6 ~407m) was picked up at 1002 UT on 25 March by MLS, observing it at March 25.42-43p4 at G=20.8-22.0 and 25.51-52p4 at G=21.2-22.1. This detection was confirmed by Pan-STARRS 2 (PS2) (March 23.47-50p4), Schwarzschild Obs. (March 26.06-07p3), ARO Westfield (March 26.37p2), and Visnjan Obs. (March 27.04-05p2).

MPEC 2020-F172 - "06:05 UT" - 2020 FH6

K20F06H 2020 FH6 (H=20.0 ~339m) was picked up at 1102 UT on 25 March by MLS, observing it at March 25.46-52p6. This detection was confirmed by Schwarzschild Obs. (March 26.02-03p3 at V=20.4-21.1, 27.03-04p4 at V=22.9-24.0, 28.07-08p3 at V=20.1-4 & 28.12-13p3 at V=20.1-3), ESA Optical Ground Station (ESA OGS) (March 26.12p2), ARO Westfield (March 26.38-39p3), St. Pardon de Conques Obs. (March 27.05-07p3), Great Shefford Obs. (March 27.07-10p2 & 28.05-07p2), Steward Mt. Lemmon Sta. (March 27.49-50p3), and Visnjan Obs. (March 28.14-15p3).

MPEC 2020-F171 - "06:03 UT" - 2020 FG6

K20F06G 2020 FG6 (Earth MOID=3.0 LD, H=27.1 ~13m, NHATS target) was picked up at 0859 UT on 25 March by MLS, observing it at March 25.37-39p4 and 27.45-46p3. This detection was confirmed by Steward Mt. Lemmon Sta. (March 25.48-49p3), Great Shefford Obs. (March 27.99-03p3), and Visnjan Obs. (March 28.06-07p4).

MPEC 2020-F170 - "06:01 UT" - 2020 FF6

K20F06F 2020 FF6 (H=20.5 ~269m) was picked up at 1406 UT on 23 March by Pan-STARRS 1 (PS1), observing it at March 23.59-62p6 at w=21.82-22.60. This detection was confirmed by Schwarzschild Obs. (March 24.14-15p3 at V=21.7-22.2 & 27.10-11p3 at V=21.7-22.2), R. Wainscoat on Mauna Kea (March 24.60p3), and Tholen 2.24m (March 24.60-61p3 at G=22.15-25).

MPEC 2020-F169 - "06:00 UT" - 2020 FE6

K20F06E 2020 FE6 (Q=4.094 AU, H=19.8 ~371m) was picked up at 1304 UT on 21 March by PS1, observing it at March 21.54-57p3 at w=21.60-22.14. This detection was confirmed by PS2 (March 21.50-54p4 at G=21.6-22.1), Schwarzschild Obs. (March 23.05-06p3 at V=21.9-22.7, 24.13p2 at V=21.5-6, 25.02-03p2 at V=21.4-22.4 & 28.06p3 at V=21.0-2), and Visnjan Obs. (March 28.04-05p2).

MPEC 2020-F168 - "01:29 UT" - Comet C/2019 S4 (Lemmon)

CK19S040* C/2019 S4 (Lemmon) (i=92.0°, q=3.442 AU, Q=474.937 AU, TP=2020 Apr. 7.94618 TT) was picked up at 1053 UT on 17 Sept. 2019 by MLS, observing it at 2019 Sept. 17.45-51p8, 2019 Sept. 18.43-45p4, and 2019 Sept. 19.50p3. This detection was confirmed by Visnjan Obs. (2019 Sept. 20.07-08p3), GINOP-KHK (2019 Sept. 27.01-03p3), Hidetaka Sato via iTelescope Obs. Mayhill (2019 Sept. 27.37-38p2, 2019 Nov. 2.30p2 & 2019 Dec. 17.17-18p2), Steward Mt. Lemmon Sta. (2019 Sept. 30.47-48p3, 2019 Oct. 2.49-50p4 & 2019 Oct. 3.47-48p4), McDonald Obs. (2019 Oct. 2.42-43p3), Marco Micheli on Mauna Kea (2019 Oct. 24.51p3), SATINO-1 (2019 Oct. 27.01-02p3), Shinshiro Obs. (2019 Oct. 30.58-59p3), the SZTE Asteroid Program (2019 Nov. 24.90-92p6, 2019 Dec. 26.77-79p3, 2019 Dec. 31.74p2, Jan. 1.75-76p2 & Feb. 20.75-77p3), Buchloe Obs. (2019 Dec. 29.76p3), and 29PREMOTE Obs. (Jan. 1.91-94p2).

Observers on 28 March '20

A total of 37 observers appear in today's MPECs.

Code	Observer / observatory
`L27`	29PREMOTE Obs., 1 in MPEC 2020-F168 -- C/2019 S4
`H21`	Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2020-F172, 2020-F173 & 2020-F175 -- 2020 FS1, 2020 FO2, 2020 FJ6, 2020 FH6, 2020 FE2, 2020 DX, 2020 DT3, 2020 DM4, 2019 SN10
`T05`	ATLAS Haleakala in Hawaii, 1 in MPEC 2020-F175 -- 2020 FM2
`215`	Buchloe Obs. in Germany, 1 in MPEC 2020-F168 -- C/2019 S4
`X74`	Campo dos Amarais Obs., 1 in MPEC 2020-F175 -- 4954
`160`	Castelmartini Obs. in Italy, 15 in MPEC 2020-F175 -- 2020 EH, 2020 DT3, 2019 XG1, 2010 UE7, 2001 GS2, 85628, 65690, 54686, 52768, 448818, 35107, 276732, 18172, 154555, 137064
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2020-F174 -- 2020 FK6
`Z99`	Clixby Obs. in England, 1 in MPEC 2020-F175 -- 2019 UT9
`K87`	Dettelbach Vineyard Obs. in Germany, 9 in MPEC 2020-F175 -- 2020 FX4, 2020 FW4, 2020 FW2, 2020 FV4, 2020 FV2, 2020 FO2, 2020 FN1, 2020 FE2, 2020 FB
`J04`	ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2020-F172 -- 2020 FH6
`W46`	Foxfire Village Obs., 1 in MPEC 2020-F175 -- 2020 DT3
`K88`	GINOP-KHK in Hungary, 1 in MPEC 2020-F168 -- C/2019 S4
`E94`	Gisborne Obs. in New Zealand, 3 in MPEC 2020-F175 -- 2020 FT2, 2020 BO5, 2020 AZ2
`J95`	Great Shefford Obs. in England, 7 in MPECs 2020-F171, 2020-F172 & 2020-F175 -- 2020 FW5, 2020 FR3, 2020 FN3, 2020 FK4, 2020 FH6, 2020 FG6, 2020 FE2
`A17`	Guidestar Obs. in Germany, 8 in MPEC 2020-F175 -- 2020 FW2, 2020 FR5, 2020 FN1, 2020 DX, 2020 AZ2, 2019 WB6, 2019 UT9, 2019 SH6
`Z41`	Irydeo Obs., 1 in MPEC 2020-F175 -- 2020 FE2
`H06\|`	Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2020-F168 -- C/2019 S4
`1861`	program code 1 via Kitab Obs., 1 in MPEC 2020-F175 -- 2015 FC35
`C401`	program code 1 via Kuban State Univ. Obs. in Russia, 1 in MPEC 2020-F175 -- 52768
`Z43`	Landehen Obs., 1 in MPEC 2020-F175 -- 9400
`568^`	R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2020-F170 -- 2020 FF6
`568_`	Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2020-F168 -- C/2019 S4
`711`	McDonald Obs. in Texas, 1 in MPEC 2020-F168 -- C/2019 S4
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2020-F168, 2020-F171, 2020-F172, 2020-F173 & 2020-F174 -- 2020 FK6, 2020 FJ6, 2020 FH6, 2020 FG6, C/2019 S4
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2020-F169 & 2020-F170 -- 2020 FF6, 2020 FE6
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2020-F169 & 2020-F173 -- 2020 FJ6, 2020 FE6
`C95`	SATINO-1 in France, 2 in MPECs 2020-F168 & 2020-F175 -- 2019 YA, C/2019 S4
`033`	Schwarzschild Obs. in Germany, 16 in MPECs 2020-F169, 2020-F170, 2020-F172, 2020-F173 & 2020-F175 -- 2020 FJ6, 2020 FH6, 2020 FF6, 2020 FE6, 2020 EM, 2017 FE90, 2017 DQ37, 2017 BP31, 2017 BB94, 2016 WE1, 2016 FG15, 2016 EE157, 2016 EE156, 2015 FC35, 2011 GD60, 2008 FG
`Q11`	Shinshiro Obs., 1 in MPEC 2020-F168 -- C/2019 S4
`W88!`	W.F. Cashwell in Nevada via Slooh.com Chile Obs. in Chile, 1 in MPEC 2020-F175 -- 2013 AO27
`W885`	M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2020-F175 -- 2015 FC35
`I93`	St. Pardon de Conques Obs. in France, 1 in MPEC 2020-F172 -- 2020 FH6
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2020-F168, 2020-F171, 2020-F172, 2020-F174 & 2020-F175 -- 2020 FW4, 2020 FK6, 2020 FH6, 2020 FG6, C/2019 S4
`461`	SZTE Asteroid Program in Hungary, 1 in MPEC 2020-F168 -- C/2019 S4
`A16`	Tentlingen Obs. in Switzerland, 5 in MPEC 2020-F175 -- 2020 DT3, 2020 DM4, 492143, 388945, 7088
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2020-F170 & 2020-F175 -- 2020 FM1, 2020 FF6
`L01`	Visnjan Obs. in Croatia, 5 in MPECs 2020-F168, 2020-F169, 2020-F171, 2020-F172 & 2020-F173 -- 2020 FJ6, 2020 FH6, 2020 FG6, 2020 FE6, C/2019 S4
`Z92`	West Park Obs. in England, 1 in MPEC 2020-F175 -- 52768
`C51`	WISE in Earth polar orbit, 3 in MPEC 2020-F175 -- 90075, 401857, 18882

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

Impact Risk Monitoring on 28 March '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 FK6	NEODyS	1700	2054-2118	140	5.92e-05	-5.76	-6.72	0	NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2020-03-16.280 to 2020-03-17.131."
2020 FK6	JPL Sentry	1615	2054-2117	104	6.05695645e-05	-5.74	-6.71	0	JPL: Computed at 00:37 today Pacific time based on 10 observations spanning .85107 days (2020-Mar-16.27896 to 2020-Mar-17.13003). Diameter approximately 0.008 km. from weighted mean H=28.07.

2020 FR3	JPL Sentry	1615	R E M O V E D						JPL: Risk listing removed at 1400 UTC today

2020 FN3	NEODyS	1616	2091-2116	17	1.98e-06	-5.78	-6.19	0	NEODyS: "Based on 32 optical observations (of which 1 are rejected as outliers) from 2020-03-22.368 to 2020-03-27.962."
2020 FN3	JPL Sentry	1615	2048-2117	19	1.2055381e-06	-5.97	-6.35	0	JPL: Computed at 07:10 today Pacific time based on 32 observations spanning 5.5935 days (2020-Mar-22.36744 to 2020-Mar-27.960906). Diameter approximately 0.047 km. from weighted mean H=24.31.

2020 FM1	NEODyS	1616	2106-2115	6	1.92e-06	-8.21	-8.64	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2020-03-16.257 to 2020-03-24.444."
2020 FM1	JPL Sentry	1615	2071-2109	4	1.4203e-06	-8.30	-8.53	0	JPL: Computed at 07:06 today Pacific time based on 20 observations spanning 8.1879 days (2020-Mar-16.25579 to 2020-Mar-24.443693). Diameter approximately 0.005 km. from weighted mean H=29.32.

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 28 March '20

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

1700	Noted that NEODyS has posted 2020 FK6 as an impact risk - see above
1616	Noted that NEODyS has updated its 2020 FM1 risk assessment - see above Noted that NEODyS has updated its 2020 FN3 risk assessment - see above
1615	Noted that JPL Sentry has posted 2020 FK6 as an impact risk - see above Noted that JPL Sentry has updated its 2020 FM1 risk assessment - see above Noted that JPL Sentry has updated its 2020 FN3 risk assessment - see above Noted that JPL Sentry has removed 2020 FR3 as an impact risk - see above Grabbed MPEC 2020-F169 - 2020 FE6 - see above Grabbed MPEC 2020-F170 - 2020 FF6 - see above Grabbed MPEC 2020-F171 - 2020 FG6 - see above Grabbed MPEC 2020-F172 - 2020 FH6 - see above Grabbed MPEC 2020-F173 - 2020 FJ6 - see above Grabbed MPEC 2020-F174 - 2020 FK6 - see above Grabbed MPEC 2020-F175 - Daily Orbit Update - see above
0431	Grabbed MPEC 2020-F168 - Comet C/2019 S4 (Lemmon) - see above

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