2020-09-24 Tracking News

Contents on 24 September '20

IAU Minor Planet Center
- NEOCP Activity -- 53 listings
- New MPECs -- fourteen MPECs
Observers -- 41 observers
Impact Risk Monitoring -- five objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1168 risk-listed objects, 120 have had news in the last 31 days. Updated at 1805 UTC on 24 Sept.
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 24 September '20

The MPC's NEO Confirmation Page has 53 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 32 were "one nighters." So far The Tracking News has counted a total of 74 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 24 September '20

Minor Planet Electronic Circulars

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

MPEC 2020-S171 time-stamped "00:02 UT" - 2020 SY3 - see below
MPEC 2020-S172 time-stamped "00:06 UT" - 2020 SZ3 - see below
MPEC 2020-S173 time-stamped "01:57 UT" - 2020 SB4 - see below
MPEC 2020-S174 time-stamped "01:59 UT" - 2020 SC4 - see below
MPEC 2020-S175 time-stamped "06:39 UT" - 2020 SD4 - see below
MPEC 2020-S176 time-stamped "06:40 UT" - 2020 SE4 - see below
MPEC 2020-S177 time-stamped "06:41 UT" - 2020 SF4 - see below
MPEC 2020-S178 time-stamped "06:43 UT" - 2020 SG4 - see below
MPEC 2020-S179 time-stamped "06:44 UT" - 2020 SH4 - see below
MPEC 2020-S180 time-stamped "09:02 UT" - 2020 SJ4 - see below
MPEC 2020-S181 time-stamped "09:03 UT" - 2020 SK4 - see below
MPEC 2020-S182 time-stamped "09:04 UT" - 2020 SL4 - see below
MPEC 2020-S183 time-stamped "09:06 UT" - 2020 SM4 - see below
MPEC 2020-S184 time-stamped "12:01 UT" - Daily Orbit Update

<< DOU on 24 September '20 >> MPEC 2020-S184 - "12:01 UT" - Daily Orbit Update

Observations of risk-listed objects
K20S01O 2020 SO1 (small asteroid, arc=7 days, H=27.1 ~13m, close passer, NHATS target) from Steward Obs. Mt. Lemmon Station (Sept. 24.42-44p4)
K20S00W 2020 SW (small asteroid, arc=6 days, H=29.0 ~5m, close passer, NHATS target) from ATLAS Haleakala (Sept. 23.49-52p4), Marian Urbanik via iTelescope Obs. Siding Spring (Sept. 23.63p3), program code 3 via Makes Obs. (Sept. 23.74-77p14), Haute Provence Obs. (Sept. 23.79-81p9), Bernezzo Obs. (Sept. 23.80-81p4), PASTIS Obs. (Sept. 23.81-82p2), QOS Obs. (Sept. 23.81-82p6), Pascoli Obs. (Sept. 23.83-84p3), North Obs. (Sept. 23.84-88p10 & 23.92-93p5), Oberfrauendorf Obs. (Sept. 23.86-90p8), Chelmsford Obs. (Sept. 23.87p2 & 23.94-95p4), M57 Obs. (Sept. 23.87-91p6), Povegliano Veronese Obs. (Sept. 23.87p4), ALMO Obs. (Sept. 23.87-88p3), Dettelbach Vineyard Obs. (Sept. 23.93-94p4), Northolt Branch Obs. (Sept. 23.94-97p8), Farra d'Isonzo Obs. (Sept. 23.95-96p4), Ceccano Obs. (Sept. 24.00p3), Great Shefford Obs. (Sept. 24.04p4), and Sandlot Obs. (Sept. 24.22-23p5)
Observations of recently (no longer) risk-listed objects
K20R07H 2020 RH7 (i=44.2°, arc=9 days, H=20.2 ~309m) from the Mt. Lemmon Survey (MLS) (Sept. 23.35-37p4)
K20R00B 2020 RB (i=59.2°, Q=5.520 AU, arc=20 days, H=19.1 ~513m) from Pan-STARRS 2 (PS2) (Sept. 23.23-25p4)
Observations of close-passing objects
K20S03O 2020 SO3 (arc=2 days, H=27.2 ~12m) from Steward Mt. Lemmon Sta. (Sept. 24.47p4)
K20S03A 2020 SA3 (arc=3 days, H=25.4 ~28m, NHATS target) from Povegliano Veronese Obs. (Sept. 23.84-85p4), Dettelbach Vineyard Obs. (Sept. 23.91-92p3), and Steward Mt. Lemmon Sta. (Sept. 24.24p4)
K20S01M 2020 SM1 (arc=5 days, H=26.2 ~19m, NHATS target) from M57 Obs. (Sept. 23.94-99p3) and Steward Mt. Lemmon Sta. (Sept. 24.13-14p4)
K20S00N 2020 SN (arc=7 days, H=24.9 ~35m) from ATLAS Haleakala (Sept. 23.53-55p4), QOS Obs. (Sept. 23.83p6), Povegliano Veronese Obs. (Sept. 23.88p4), Dettelbach Vineyard Obs. (Sept. 24.02-03p3), and Steward Mt. Lemmon Sta. (Sept. 24.47p4)
K20R07W 2020 RW7 (arc=9 days, H=25.2 ~31m) from Steward Mt. Lemmon Sta. (Sept. 24.42-44p4)
K20R06N 2020 RN6 (arc=10 days, H=25.1 ~32m) from MLS (Sept. 23.35-37p4)
K20R02K 2020 RK2 (arc=13 days, H=24.2 ~49m) from the Catalina Sky Survey (CSS) (Sept. 23.26-29p3) and PS2 (Sept. 23.38-42p3)
K20R01M 2020 RM1 (arc=14 days, H=26.5 ~17m) from Astronomical Research Obs. Westfield (Sept. 22.22-24p3 at V=22.1-3)
K20P07M 2020 PM7 (Q=4.014 AU, arc=2 opp, H=22.3 ~117m) from ATLAS Mauna Loa (Sept. 23.35-39p4), program code 1 via Kuban State Univ. Obs. (Sept. 23.73p1, 23.81p1 & 23.85p1), and CSS (Sept. 24.14-16p4)
K09R01U 2009 RU1 (arc=2 opp, H=24.2 ~49m, NHATS target) from MLS (Sept. 23.24-25p4)
K01SS6G 2001 SG286 (arc=6 opp, H=20.8 ~234m) from program code "[" (25) via Slooh.com Canary Islands Obs. (Sept. 21.90-93p3) and Taurus-1 Obs. (Sept. 22.99-01p7)
Observation campaigns (NHATS targets, radar support)
K20S03D 2020 SD3 (arc=4 days, H=24.8 ~37m, NHATS) from Steward Mt. Lemmon Sta. (Sept. 24.37p2)
K20S00O 2020 SO (NHATS) from Sandlot Obs. (Sept. 24.25-29p3)
K20R07U 2020 RU7 (arc=9 days, H=25.4 ~28m, NHATS) from Steward Mt. Lemmon Sta. (Sept. 24.12p3)
K20R03T 2020 RT3 (arc=13 days, H=26.2 ~19m, NHATS) from PS2 (Sept. 23.42-44p3)
K20R03O 2020 RO3 (arc=12 days, H=25.2 ~31m, NHATS) from ARO Westfield (Sept. 22.07-08p3 at V=22.1-4)
K20R01O 2020 RO1 (arc=27 days, H=25.4 ~28m, NHATS) from Steward Mt. Lemmon Sta. (Sept. 24.33-36p3)
K20P03V 2020 PV3 (arc=40 days, H=25.0 ~34m, NHATS) from MLS (Sept. 23.31-32p4)
K20P01X 2020 PX1 (arc=42 days, H=23.7 ~62m, NHATS) from Eden Obs. (Sept. 20.65-70p3)
K20P00P 2020 PP (arc=48 days, H=20.7 ~245m, NHATS) from Sandlot Obs. (Sept. 24.36-37p2)
K20M00M 2020 MM (arc=97 days, H=25.1 ~32m, NHATS) from ARO Westfield (Sept. 22.17-19p3 at V=22.1-4)
K20L00R 2020 LR (arc=105 days, H=24.1 ~51m, NHATS) from Sandlot Obs. (Sept. 24.14-19p4)
K12H20D 2012 HD20 (arc=3 opp, H=22.2 ~123m, NHATS) from PS2 (Sept. 23.42-45p4)
K07U01Y 2007 UY1 (arc=3 opp, H=22.9 ~89m, NHATS) from Steward Mt. Lemmon Sta. (Sept. 24.44-45p3)
-- NHATS target table
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20S03Q 2020 SQ3 (arc=2 days, H=26.4 ~18m) from Steward Mt. Lemmon Sta. (Sept. 24.19-20p4)
K20S03P 2020 SP3 (arc=2 days, H=26.8 ~15m) from Steward Mt. Lemmon Sta. (Sept. 24.31-32p3)
K20S02K 2020 SK2 (arc=8 days, H=24.7 ~39m) from Steward Mt. Lemmon Sta. (Sept. 24.33p4)
K20S01Y 2020 SY1 (Q=4.298 AU, arc=5 days, H=23.5 ~68m) from ARO Westfield (Sept. 22.20-22p3 at V=22.1-2)
K20S00R 2020 SR (Q=4.619 AU, arc=8 days, H=24.3 ~47m) from Steward Mt. Lemmon Sta. (Sept. 24.45-47p4)
K20S00G 2020 SG (arc=10 days, H=25.3 ~29m) from Steward Mt. Lemmon Sta. (Sept. 24.31p4)
K20S00F 2020 SF (arc=7 days, H=24.5 ~43m) from MLS (Sept. 23.33-34p4)
K20R07X 2020 RX7 (arc=13 days, H=25.3 ~29m) from Pan-STARRS 1 (PS1) (Sept. 23.36-40p4)
K20R07R 2020 RR7 (arc=9 days, H=24.2 ~49m) from Steward Mt. Lemmon Sta. (Sept. 24.24p2)
K20R07K 2020 RK7 (arc=10 days, H=24.0 ~54m) from Steward Mt. Lemmon Sta. (Sept. 24.29-30p4)
K20R07D 2020 RD7 (arc=9 days, H=26.2 ~19m) from Steward Mt. Lemmon Sta. (Sept. 24.32-33p3)
K20R07C 2020 RC7 (arc=9 days, H=25.9 ~22m) from Steward Mt. Lemmon Sta. (Sept. 24.41p3)
K20R06K 2020 RK6 (arc=13 days, H=25.3 ~29m) from PS2 (Sept. 23.38-42p3)
K20R04Y 2020 RY4 (arc=17 days, H=23.5 ~68m) from PS1 (Sept. 23.35-38p3)
K20R04S 2020 RS4 (arc=14 days, H=23.7 ~62m) from Steward Mt. Lemmon Sta. (Sept. 24.28p2)
K20R03Z 2020 RZ3 (Q=4.081 AU, arc=14 days, H=24.9 ~35m) from PS2 (Sept. 23.42-44p3) and Steward Mt. Lemmon Sta. (Sept. 24.30p4)
K20R03S 2020 RS3 (q=0.342 AU, arc=13 days, H=22.7 ~98m) from MLS (Sept. 23.31-33p4)
K20R03J 2020 RJ3 (arc=12 days, H=23.4 ~71m) from CSS (Sept. 23.32-34p4) and Dettelbach Vineyard Obs. (Sept. 23.89-90p3)
K20R02S 2020 RS2 (arc=12 days, H=26.2 ~19m) from ARO Westfield (Sept. 22.26-28p3 at V=22.1)
K20R02L 2020 RL2 (Q=4.138 AU, arc=13 days, H=24.8 ~37m) from PS2 (Sept. 23.46-47p2)
K20R01Q 2020 RQ1 (Q=5.610 AU, arc=17 days, H=23.2 ~78m) from PS2 (Sept. 23.34-36p2)
K20R01F 2020 RF1 (arc=14 days, H=26.2 ~19m) from ARO Westfield (Sept. 22.24-25p3 at V=22.1-4)
K20R01D 2020 RD1 (arc=20 days, H=23.9 ~56m) from MLS (Sept. 23.26-28p4 at G=20.9-22.4) and Steward Mt. Lemmon Sta. (Sept. 24.25-26p4)
K20R00Z 2020 RZ (arc=17 days, H=23.9 ~56m) from Steward Mt. Lemmon Sta. (Sept. 24.33-37p4)
K20R00F 2020 RF (Q=4.193 AU, arc=26 days, H=22.3 ~117m) from Castelmartini Obs. (Sept. 16.00-01p3) and ATLAS Mauna Loa (Sept. 23.46-50p4)
K20Q04Y 2020 QY4 (arc=35 days, H=23.4 ~71m) from PS1 (Sept. 23.42-45p4)
K20Q04E 2020 QE4 (arc=35 days, H=23.7 ~62m) from MLS (Sept. 23.33-35p4)
K20P03Y 2020 PY3 (arc=40 days, H=23.8 ~59m) from MLS (Sept. 23.38-40p4)
K20P03R 2020 PR3 (arc=40 days, H=23.0 ~85m) from MLS (Sept. 23.31-33p4)
K20P03J 2020 PJ3 (arc=40 days, H=25.2 ~31m) from ARO Westfield (Sept. 22.13-15p3 at V=22.0-22.2)
K20O00R 2020 OR (arc=95 days, H=22.5 ~107m) from MLS (Sept. 23.43-49p8)
K18R03V 2018 RV3 (arc=4 opp, H=23.0 ~85m) from SATINO-1 (Sept. 15.92-93p3)
K18E02J 2018 EJ2 (arc=2 opp, H=22.1 ~129m) from MLS (Sept. 23.35-37p4 at G=21.0-22.3)
K17S20T 2017 ST20 (arc=3 opp, H=22.5 ~107m) from ARO Westfield (Sept. 22.31-32p3 at V=21.8-22.1)
K16T56H 2016 TH56 (arc=2 opp, H=22.2 ~123m) from MLS (Sept. 23.33-34p3)
K20S02H 2020 SH2 (i=44.2°, arc=13 days, H=22.0 ~135m) from Steward Mt. Lemmon Sta. (Sept. 24.16p4)
K20R03A 2020 RA3 (arc=14 days, H=22.0 ~135m) from MLS (Sept. 23.40-42p4)
K20R00C 2020 RC (arc=21 days, H=22.0 ~135m) from Steward Mt. Lemmon Sta. (Sept. 24.12p2)
K20O07K 2020 OK7 (arc=56 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Sept. 23.31-33p3 & 24.25-28p3)
K13V04Q 2013 VQ4 (arc=3 opp, H=21.8 ~148m) from PS1 (Sept. 23.41-44p3 at w=22.0-22.2)
Observations of other objects
K20S03E 2020 SE3 (q=0.382 AU, Q=4.813 AU, arc=18 days, H=20.9 ~224m) from Steward Mt. Lemmon Sta. (Sept. 24.16p3)
K20S00B 2020 SB (Q=0.988 AU, arc=8 days, H=20.3 ~295m) from Dettelbach Vineyard Obs. (Sept. 23.77-78p3), MLS (Sept. 24.09-10p4), and Steward Mt. Lemmon Sta. (Sept. 24.14-15p4)
K20S00A 2020 SA from Steward Mt. Lemmon Sta. (Sept. 24.20p4)
K20R09Z 2020 RZ9 (Q=4.205 AU, arc=9 days, H=21.1 ~204m) from MLS (Sept. 23.40-42p3)
K20R08X 2020 RX8 (Q=0.990 AU, arc=9 days, H=19.7 ~389m) from Steward Mt. Lemmon Sta. (Sept. 24.13p2)
K20R01E 2020 RE1 (i=56.2°, arc=21 days, H=20.6 ~257m) from Castelmartini Obs. (Sept. 15.96p3), Sencelles Obs. (Sept. 23.79-82p2), and Steward Mt. Lemmon Sta. (Sept. 24.32-33p3)
K20R00R 2020 RR (i=39.1°, arc=18 days, H=21.3 ~186m) from Steward Mt. Lemmon Sta. (Sept. 24.17p4)
K20Q06U 2020 QU6 (arc=27 days, H=18.3 ~741m) from ATLAS Mauna Loa (Sept. 23.35-39p4)
K20Q06P 2020 QP6 (arc=29 days, H=20.8 ~234m) from Steward Mt. Lemmon Sta. (Sept. 24.15-16p4)
K20Q06K 2020 QK6 (arc=28 days, H=20.8 ~234m) from Steward Mt. Lemmon Sta. (Sept. 23.51p4)
K20Q05Q 2020 QQ5 (arc=31 days, H=21.3 ~186m) from MLS (Sept. 23.35-37p4)
K20Q05P 2020 QP5 (i=40.3°, Q=4.071 AU, arc=34 days, H=18.2 ~776m) from ARO Westfield (Sept. 22.09-10p3 at V=21.9-22.2)
K20Q05O 2020 QO5 (arc=35 days, H=19.0 ~537m) from Steward Mt. Lemmon Sta. (Sept. 23.50-51p4 & 24.49p4)
K20Q04M 2020 QM4 (arc=36 days, H=18.6 ~645m) from CSS (Sept. 23.46-47p4), ATLAS Haleakala (Sept. 23.58-64p5), and GINOP-KHK (Sept. 23.99-01p3)
K20P05C 2020 PC5 (Q=4.177 AU, arc=40 days, H=18.5 ~676m) from CSS (Sept. 23.32-34p4)
K20P01D 2020 PD1 (Q=4.135 AU, arc=93 days, H=19.3 ~467m) from Eden Obs. (Sept. 20.73-75p3), CSS (Sept. 23.37-39p4), PS1 (Sept. 23.40-44p4), and ATLAS Haleakala (Sept. 23.51-53p4)
K20O08C 2020 OC8 (arc=100 days, H=20.7 ~245m) from MLS (Sept. 23.21-22p3)
K20O06X 2020 OX6 (arc=55 days, H=21.3 ~186m) from ATLAS Mauna Loa (Sept. 23.41-42p4) and PS2 (Sept. 23.42-45p4)
K20O02A 2020 OA2 (arc=88 days, H=21.7 ~155m) from ATLAS Haleakala (Sept. 23.46-48p4) and Purple Mtn. Obs. Xuyi Station (Sept. 23.61-63p2)
K20N01Q 2020 NQ1 (Q=4.093 AU, arc=75 days, H=20.3 ~295m) from Steward Mt. Lemmon Sta. (Sept. 24.15-16p4)
K20M02F 2020 MF2 (Q=4.267 AU, arc=120 days, H=19.7 ~389m) from PS1 (Sept. 23.46-47p2)
K20L03B 2020 LB3 (arc=2 opp, H=19.6 ~407m) from MLS (Sept. 23.26-28p4)
K20A00K 2020 AK (arc=268 days, H=19.2 ~490m) from PS2 (Sept. 22.40-42p3)
K19S04V 2019 SV4 (q=0.336 AU, arc=3 opp, H=21.2 ~195m) from Sandlot Obs. (Sept. 24.39-40p2)
K19G03Q 2019 GQ3 (arc=2 opp, H=20.7 ~245m) from MLS (Sept. 23.35-37p4)
K19A03Q 2019 AQ3 (i=47.2°, Q=0.774 AU, arc=3 opp, H=17.6 ~1.02 km) from the Zwicky Transient Facility (ZTF) (Sept. 21.51p1 & 23.51-53p4)
K18T05S 2018 TS5 (arc=4 opp, H=21.4 ~178m) from MLS (Sept. 23.37-39p4)
K16V03G 2016 VG3 (arc=2 opp, H=20.5 ~269m) from PS1 (Sept. 22.58-61p4)
K16T93F 2016 TF93 (arc=4 opp, H=17.9 ~891m) from MLS (Sept. 23.43-45p4)
K16N38V 2016 NV38 (Q=4.019 AU, arc=2 opp, H=18.6 ~645m) from QOS Obs. (Sept. 23.98p4)
K16F14Y 2016 FY14 (arc=2 opp, H=19.1 ~513m) from Sandlot Obs. (Sept. 24.34-35p2)
K16E85D 2016 ED85 (Q=5.062 AU, arc=3 opp, H=17.7 ~977m) from Castelmartini Obs. (Sept. 16.02p3), CSS (Sept. 23.44-45p4), ATLAS Haleakala (Sept. 23.57-62p4), QOS Obs. (Sept. 23.93p6), and GINOP-KHK (Sept. 23.98-99p3)
K14SE3G 2014 SG143 (arc=4 opp, H=18.9 ~562m) from PS1 (Sept. 23.46-47p2)
K14Qh3L 2014 QL433 (arc=4 opp, H=19.9 ~355m) from MLS (Sept. 23.24-25p4 at G=20.8-22.2)
K13U14X 2013 UX14 (arc=4 opp, H=18.2 ~776m) from QOS Obs. (Sept. 23.97p4)
K13TE4V 2013 TV144 (arc=3 opp, H=20.7 ~245m) from ATLAS Mauna Loa (Sept. 23.38-39p4)
K13P06Y 2013 PY6 (arc=4 opp, H=19.3 ~467m) from Castelmartini Obs. (Sept. 15.97p3), CSS (Sept. 23.37-39p4), and ATLAS Haleakala (Sept. 23.53-55p4)
K12D08P 2012 DP8 (arc=5 opp, H=19.8 ~371m) from Castelmartini Obs. (Sept. 16.01p3)
K11B59F 2011 BF59 (arc=3 opp, H=19.2 ~490m) from MLS (Sept. 23.41-42p3)
K10JF3V 2010 JV153 (arc=3 opp, H=19.7 ~389m) from ATLAS Mauna Loa (Sept. 23.35-39p4)
K09U02E 2009 UE2 (arc=5 opp, H=20.3 ~295m) from PS2 (Sept. 23.37-41p4)
K08SF0W 2008 SW150 (arc=4 opp, H=19.6 ~407m) from ATLAS Mauna Loa (Sept. 23.53-55p4)
K07VD7X 2007 VX137 (arc=5 opp, H=18.5 ~676m) from Castelmartini Obs. (Sept. 15.99p3), CSS (Sept. 23.37-38p4), and Dettelbach Vineyard Obs. (Sept. 24.06-07p4)
K07S02W 2007 SW2 (arc=3 opp, H=21.3 ~186m) from MLS (Sept. 23.21-22p3)
K06U63D 2006 UD63 (arc=4 opp, H=18.9 ~562m) from ATLAS Mauna Loa (Sept. 23.31-40p7)
K06H00B 2006 HB (arc=4 opp, H=18.9 ~562m) from ATLAS Mauna Loa (Sept. 23.32-34p7)
K04R84F 2004 RF84 (arc=4 opp, H=18.3 ~741m) from PS2 (Sept. 23.34-36p3)
K00P27Q 2000 PQ27 (arc=3 opp, H=19.9 ~355m) from CSS (Sept. 23.37-39p4)
o5657 505657 2014 SR339 from WISE (Sept. 22.37p1, 22.50p1, 22.57p1, 22.63p1, 22.70p1, 22.83p1, 22.89p1 & 22.96p1)

MPEC 2020-S183 - "09:06 UT" - 2020 SM4

K20S04M 2020 SM4 (small asteroid, Earth MOID=6.3 LD, H=27.7 ~10m) was picked up at 0751 UT on 23 Sept. by MLS, observing it at Sept. 22.38-40p3, 23.33-34p4, and 24.30-31p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Sept. 23.41p3).

MPEC 2020-S182 - "09:04 UT" - 2020 SL4

K20S04L 2020 SL4 (small asteroid, H=24.6 ~41m) was picked up at 0757 UT on 23 Sept. by MLS, observing it at Sept. 23.33-35p4 and 23.42-43p3. This detection was confirmed by PS1 (Sept. 21.38-39p2), PS2 (Sept. 21.42p1), and Steward Mt. Lemmon Sta. (Sept. 24.21-22p3).

MPEC 2020-S181 - "09:03 UT" - 2020 SK4

K20S04K 2020 SK4 (risk listed, Earth MOID=0.6 LD, H=30.4 ~3m) was picked up at 0734 UT on 22 Sept. by MLS, observing it at Sept. 22.32-33p4 at G=21.1-22.0, 23.29-30p4 at G=21.1-6, and 24.27p3 at G=22.09-55. This detection was confirmed by Magdalena Ridge Obs. (MRO) (Sept. 22.36-39p4 at G=21.1-22.1) and Steward Mt. Lemmon Sta. (Sept. 22.39-40p3).

MPEC 2020-S180 - "09:02 UT" - 2020 SJ4

K20S04J 2020 SJ4 (small asteroid, H=24.3 ~47m) was picked up at 1009 UT on 23 Sept. by PS2, observing it at Aug. 18.54-55p2, 27.49-52p4, and Sept. 23.42-44p3. This detection was confirmed by PS1 (July 29.54p1 at G=22.83, Aug. 13.50-54p4 at G=21.47-22.72, 15.49-51p3 at G=21.89-22.15, Sept. 8.53-56p3 at G=21.23-69 & 14.45p1 at G=20.83) and Steward Mt. Lemmon Sta. (Sept. 24.27-28p3).

MPEC 2020-S179 - "06:44 UT" - 2020 SH4

K20S04H 2020 SH4 (Earth MOID=0.8 LD, H=27.21 ~12m) was picked up at 0628 UT on 23 Sept. by MLS, observing it at Sept. 23.27-29p3 and 24.23p4. This detection was confirmed by PS1 (Sept. 16.52-57p4 at G=22.67-23.73) and Steward Mt. Lemmon Sta. (Sept. 23.36p3).

MPEC 2020-S178 - "06:43 UT" - 2020 SG4

K20S04G 2020 SG4 (small asteroid, H=26.51 ~17m) was picked up at 0547 UT on 23 Sept. by MLS, observing it at Sept. 23.24-26p4 at G=21.5-9 and 24.23p4 at G=21.67-22.71. This detection was confirmed by PS1 (Sept. 11.29-33p3 at G=22.00-22.66 & 14.31-35p3 at G=21.67-22.20), PS2 (Sept. 16.29-31p3 at G=21.96-22.33), and Steward Mt. Lemmon Sta. (Sept. 23.35-36p3).

MPEC 2020-S177 - "06:41 UT" - 2020 SF4

K20S04F 2020 SF4 (Earth MOID=6.6 LD, H=26.33 ~18m, NHATS) was picked up at 0832 UT on 23 Sept. by PS1, observing it at Sept. 21.49-51p2 and 23.36-39p4. This detection was confirmed by Visnjan Obs. (Sept. 24.05p4) and Steward Mt. Lemmon Sta. (Sept. 24.19p3).

MPEC 2020-S176 - "06:40 UT" - 2020 SE4

K20S04E 2020 SE4 (H=19.25 ~478m) was picked up at 0241 UT on 18 Sept. by WISE, observing it at Sept. 18.11p1, 18.24p1, 18.37p1, 18.50p1, 18.64p1, 19.03p1, 19.62p1, 19.81p2, 19.88p1, 19.94p1, 20.01p1, 20.14p1, 20.20p1, 20.66p1, 20.73p1, 20.79p1, 20.86p1, 20.92p2, 21.12p1, 21.25p1, 21.38p1, 21.90p1, 22.04p1, 22.10p1, 22.30p1, 22.36p1, 22.49p1, 22.69p2, 22.75p1, 22.82p1, 23.15p1, 23.21p1, 23.28p1, and 23.34p1.

MPEC 2020-S175 - "06:39 UT" - 2020 SD4

K20S04D 2020 SD4 (small asteroid, H=25.01 ~34m) was picked up at 0754 UT on 23 Sept. by MLS, observing it at Sept. 23.33-35p4. This detection was confirmed by PS2 (Sept. 21.43-46p4) and Steward Mt. Lemmon Sta. (Sept. 23.43p3 at G=21.43 & 24.25p3 at G=20.65-22.53).

MPEC 2020-S174 - "01:59 UT" - 2020 SC4

K20S04C 2020 SC4 (small asteroid, Q=4.050 AU, H=26.7 ~15m) was picked up at 0755 UT on 23 Sept. by MLS, observing it at Sept. 23.33-35p4. This detection was confirmed by PS1 (Sept. 13.30p1 & 18.38-40p3), Steward Mt. Lemmon Sta. (Sept. 23.42p3), and Visnjan Obs. (Sept. 24.03p4).

MPEC 2020-S173 - "01:57 UT" - 2020 SB4

K20S04B 2020 SB4 (small asteroid, H=23.8 ~59m) was picked up at 0807 UT on 22 Sept. by MLS, observing it at Sept. 22.34-36p4 and 22.45p2. This detection was confirmed by PS1 (Sept. 14.52-55p2), St. Pardon de Conques Obs. (Sept. 22.85-87p3), Steward Mt. Lemmon Sta. (Sept. 23.21-22p2), and Visnjan Obs. (Sept. 24.02p4).

MPEC 2020-S172 - "00:06 UT" - 2020 SZ3

K20S03Z 2020 SZ3 (small asteroid, H=25.0 ~34m) was picked up at 0804 UT on 22 Sept. by MLS, observing it at Sept. 22.34-35p3. This detection was confirmed by PS1 (Sept. 17.52-58p4), MRO (Sept. 22.46-48p4), and Steward Mt. Lemmon Sta. (Sept. 23.21p4).

MPEC 2020-S171 - "00:02 UT" - 2020 SY3

K20S03Y 2020 SY3 (small asteroid, H=25.7 ~25m) was picked up at 0503 UT on 22 Sept. by MLS, observing it at Sept. 22.21-23p4. This detection was confirmed by PS1 (Sept. 18.26-29p3), MRO (Sept. 22.26-28p4), and Steward Mt. Lemmon Sta. (Sept. 22.33-34p3 & 23.27p3).

Observers on 24 September '20

A total of 41 observers appear in today's MPECs.

Code	Observer / observatory
`G18`	ALMO Obs., 1 in MPEC 2020-S184 -- 2020 SW
`H21`	Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2020-S184 -- 2020 SY1, 2020 RS2, 2020 RO3, 2020 RM1, 2020 RF1, 2020 QP5, 2020 PJ3, 2020 MM, 2017 ST20
`T05`	ATLAS Haleakala in Hawaii, 7 in MPEC 2020-S184 -- 2020 SW, 2020 SN, 2020 QM4, 2020 PD1, 2020 OA2, 2016 ED85, 2013 PY6
`T08`	ATLAS Mauna Loa in Hawaii, 9 in MPEC 2020-S184 -- 2020 RF, 2020 QU6, 2020 PM7, 2020 OX6, 2013 TV144, 2010 JV153, 2008 SW150, 2006 UD63, 2006 HB
`C77`	Bernezzo Obs. in Italy, 1 in MPEC 2020-S184 -- 2020 SW
`160`	Castelmartini Obs. in Italy, 6 in MPEC 2020-S184 -- 2020 RF, 2020 RE1, 2016 ED85, 2013 PY6, 2012 DP8, 2007 VX137
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2020-S184 -- 2020 RK2, 2020 RJ3, 2020 QM4, 2020 PM7, 2020 PD1, 2020 PC5, 2016 ED85, 2013 PY6, 2007 VX137, 2000 PQ27
`470`	Ceccano Obs. in Italy, 1 in MPEC 2020-S184 -- 2020 SW
`970`	Chelmsford Obs. in England, 1 in MPEC 2020-S184 -- 2020 SW
`K87`	Dettelbach Vineyard Obs. in Germany, 6 in MPEC 2020-S184 -- 2020 SW, 2020 SN, 2020 SB, 2020 SA3, 2020 RJ3, 2007 VX137
`N31`	Eden Obs., 2 in MPEC 2020-S184 -- 2020 PX1, 2020 PD1
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-S184 -- 2020 SW
`K88`	GINOP-KHK in Hungary, 2 in MPEC 2020-S184 -- 2020 QM4, 2016 ED85
`J95`	Great Shefford Obs. in England, 1 in MPEC 2020-S184 -- 2020 SW
`511`	Haute Provence Obs. in Germany, 1 in MPEC 2020-S184 -- 2020 SW
`Q622`	Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2020-S184 -- 2020 SW
`C401`	program code 1 via Kuban State Univ. Obs. in Russia, 1 in MPEC 2020-S184 -- 2020 PM7
`K38`	M57 Obs. in Italy, 2 in MPEC 2020-S184 -- 2020 SW, 2020 SM1
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2020-S171, 2020-S172 & 2020-S181 -- 2020 SZ3, 2020 SY3, 2020 SK4
`1813`	program code 3 via Makes Obs. in France, 1 in MPEC 2020-S184 -- 2020 SW
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 35 in MPECs 2020-S171, 2020-S172, 2020-S173, 2020-S174, 2020-S175, 2020-S178, 2020-S179, 2020-S181, 2020-S182, 2020-S183 & 2020-S184 -- 2020 SZ3, 2020 SY3, 2020 SM4, 2020 SL4, 2020 SK4, 2020 SH4, 2020 SG4, 2020 SF, 2020 SD4, 2020 SC4, 2020 SB4, 2020 SB, 2020 RZ9, 2020 RS3, 2020 RN6, 2020 RH7, 2020 RD1, 2020 RA3, 2020 QQ5, 2020 QE4, 2020 PY3, 2020 PV3, 2020 PR3, 2020 OR, 2020 OC8, 2020 LB3, 2019 GQ3, 2018 TS5, 2018 EJ2, 2016 TH56, 2016 TF93, 2014 QL433, 2011 BF59, 2009 RU1, 2007 SW2
`J69`	North Obs. in England, 1 in MPEC 2020-S184 -- 2020 SW
`Z80`	Northolt Branch Obs. in England, 1 in MPEC 2020-S184 -- 2020 SW
`G34`	Oberfrauendorf Obs. in Germany, 1 in MPEC 2020-S184 -- 2020 SW
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 17 in MPECs 2020-S171, 2020-S172, 2020-S173, 2020-S174, 2020-S177, 2020-S178, 2020-S179, 2020-S180, 2020-S182 & 2020-S184 -- 2020 SZ3, 2020 SY3, 2020 SL4, 2020 SJ4, 2020 SH4, 2020 SG4, 2020 SF4, 2020 SC4, 2020 SB4, 2020 RY4, 2020 RX7, 2020 QY4, 2020 PD1, 2020 MF2, 2016 VG3, 2014 SG143, 2013 VQ4
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 16 in MPECs 2020-S175, 2020-S178, 2020-S180, 2020-S182 & 2020-S184 -- 2020 SL4, 2020 SJ4, 2020 SG4, 2020 SD4, 2020 RZ3, 2020 RT3, 2020 RQ1, 2020 RL2, 2020 RK6, 2020 RK2, 2020 RB, 2020 OX6, 2020 AK, 2012 HD20, 2009 UE2, 2004 RF84
`K63`	Pascoli Obs. in Italy, 1 in MPEC 2020-S184 -- 2020 SW
`K19`	PASTIS Obs. in France, 1 in MPEC 2020-S184 -- 2020 SW
`A48`	Povegliano Veronese Obs. in Italy, 3 in MPEC 2020-S184 -- 2020 SW, 2020 SN, 2020 SA3
`D29`	Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2020-S184 -- 2020 OA2
`L18`	QOS Obs., 5 in MPEC 2020-S184 -- 2020 SW, 2020 SN, 2016 NV38, 2016 ED85, 2013 UX14
`H36`	Sandlot Obs. in Kansas, 6 in MPEC 2020-S184 -- 2020 SW, 2020 SO, 2020 PP, 2020 LR, 2019 SV4, 2016 FY14
`C95`	SATINO-1 in France, 1 in MPEC 2020-S184 -- 2018 RV3
`K14`	Sencelles Obs. in Spain, 1 in MPEC 2020-S184 -- 2020 RE1
`G40[`	program code "[" (25) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-S184 -- 2001 SG286
`I93`	St. Pardon de Conques Obs. in France, 1 in MPEC 2020-S173 -- 2020 SB4
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 48 in MPECs 2020-S171, 2020-S172, 2020-S173, 2020-S174, 2020-S175, 2020-S177, 2020-S178, 2020-S179, 2020-S180, 2020-S181, 2020-S182, 2020-S183 & 2020-S184 -- 2020 SZ3, 2020 SY3, 2020 SR, 2020 SQ3, 2020 SP3, 2020 SO3, 2020 SO1, 2020 SN, 2020 SM4, 2020 SM1, 2020 SL4, 2020 SK4, 2020 SK2, 2020 SJ4, 2020 SH4, 2020 SH2, 2020 SG4, 2020 SG, 2020 SF4, 2020 SE3, 2020 SD4, 2020 SD3, 2020 SC4, 2020 SB4, 2020 SB, 2020 SA3, 2020 SA, 2020 RZ3, 2020 RZ, 2020 RX8, 2020 RW7, 2020 RU7, 2020 RS4, 2020 RR7, 2020 RR, 2020 RO1, 2020 RK7, 2020 RE1, 2020 RD7, 2020 RD1, 2020 RC7, 2020 RC, 2020 QP6, 2020 QO5, 2020 QK6, 2020 OK7, 2020 NQ1, 2007 UY1
`A98`	Taurus-1 Obs. in Belarus, 1 in MPEC 2020-S184 -- 2001 SG286
`L01`	Visnjan Obs. in Croatia, 3 in MPECs 2020-S173, 2020-S174 & 2020-S177 -- 2020 SF4, 2020 SC4, 2020 SB4
`C51`	WISE in Earth polar orbit, 2 in MPECs 2020-S176 & 2020-S184 -- 2020 SE4, 505657
`I41`	Zwicky Transient Facility in southern California, 1 in MPEC 2020-S184 -- 2019 AQ3

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

Impact Risk Monitoring on 24 September '20

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS at 2330 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 SK4	JPL Sentry	1700	2055-2119	30	1.0108523e-05	-7.94	-8.75	0	JPL: Computed at 04:10 today Pacific time based on 18 observations spanning 1.9591 days (2020-Sep-22.31549 to 2020-Sep-24.274562). Diameter approximately 0.003 km. from weighted mean H=30.33.
2020 SK4	NEODyS	1700	2067-2118	121	1.31e-05	-7.84	-8.78	0	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2020-09-22.316 to 2020-09-24.275."

2020 SO1	JPL Sentry	1700	2101-2101	1	7.268e-07	-7.55	-7.55	0	JPL: Computed at 09:22 today Pacific time based on 81 observations spanning 7.0350 days (2020-Sep-17.40029 to 2020-Sep-24.435278). Diameter approximately 0.013 km. from weighted mean H=27.06.
2020 SO1	NEODyS	1700	2101	1	1.9e-08	-9.14	-9.14	0	NEODyS: "Based on 81 optical observations (of which 0 are rejected as outliers) from 2020-09-17.401 to 2020-09-24.436."

2020 SW	NEODyS	1804	R E M O V E D						-
2020 SW	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1631 UTC today

2009 FZ4	JPL Sentry	1700	2021-2116	396	2.3679968e-06	-5.17	-5.89	0	JPL: Computed at 22:33 April 7th of 2017 Pacific time based on 11 observations spanning .59999 days (2009-Mar-19.36974 to 2009-Mar-19.96973). Diameter approximately 0.031 km. from weighted mean H=25.21.

2001 SD286	JPL Sentry	1700	2080-2080	1	5.738e-08	-7.41	-7.41	0	JPL: Computed at 18:38 April 12th of 2017 Pacific time based on 18 observations spanning 5.1872 days (2001-Sep-24.21958 to 2001-Sep-29.40682). Diameter approximately 0.030 km. from weighted mean H=25.24.

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 24 September '20

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

1804	Noted that NEODyS has posted 2020 SK4 as an impact risk - see above Noted that NEODyS has removed 2020 SW as an impact risk - see above
1700	Noted that JPL Sentry has updated its 2001 SD286 risk assessment - see above Noted that JPL Sentry has updated its 2009 FZ4 risk assessment - see above Noted that JPL Sentry has posted 2020 SK4 as an impact risk - see above Noted that JPL Sentry has updated its 2020 SO1 risk assessment - see above Noted that NEODyS has updated its 2020 SO1 risk assessment - see above Noted that JPL Sentry has removed 2020 SW as an impact risk - see above Grabbed MPEC 2020-S175 - 2020 SD4 - see above Grabbed MPEC 2020-S176 - 2020 SE4 - see above Grabbed MPEC 2020-S177 - 2020 SF4 - see above Grabbed MPEC 2020-S178 - 2020 SG4 - see above Grabbed MPEC 2020-S179 - 2020 SH4 - see above Grabbed MPEC 2020-S180 - 2020 SJ4 - see above Grabbed MPEC 2020-S181 - 2020 SK4 - see above Grabbed MPEC 2020-S182 - 2020 SL4 - see above Grabbed MPEC 2020-S183 - 2020 SM4 - see above Grabbed MPEC 2020-S184 - Daily Orbit Update - see above
0500	Grabbed MPEC 2020-S173 - 2020 SB4 - see above Grabbed MPEC 2020-S174 - 2020 SC4 - see above
0008	Grabbed MPEC 2020-S171 - 2020 SY3 - see above Grabbed MPEC 2020-S172 - 2020 SZ3 - see above

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