2010-09-17 Tracking News

Contents on 17 September '10

IAU Minor Planet Center
- NEOCP Activity -- 15 listings: 7 new, 8 updated
- New MPECs -- eleven MPECs
Observers -- 25 observing facilities
Impact Risk Monitoring -- seven objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Of 333 risk-listed objects, 24 have had news in the last 30 days. Updated at 1820 UTC.
Earth's Busy Neighborhood Traffic Report
Three objects are known to be within ten LD of Earth today. Updated at 1948 UTC.
Ephemerides for risk-rated and nearby objects
News image catalog
Old & new CRT Archive
Old News Archive & Small Objects Archive

The latest A/CC news is available via framed access, RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

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. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity on 17 September '10

The MPC's NEO Confirmation Page has 15 listings: 7 new, 8 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven new and eight updated listings. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 28 listings on the NEOCP at some point 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 17 September '10

Minor Planet Electronic Circulars

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

MPEC 2010-S05 time-stamped "01:13 UT" - 2010 SB - see below
MPEC 2010-S06 time-stamped "01:16 UT" - 2010 SC - see below
MPEC 2010-S07 time-stamped "01:18 UT" - 2010 SD - see below
MPEC 2010-S08 time-stamped "01:21 UT" - 2010 SE - see below
MPEC 2010-S09 time-stamped "01:28 UT" - 2010 SF - see below
MPEC 2010-S10 time-stamped "06:10 UT" - Daily Orbit Update - see below
MPEC 2010-S11 time-stamped "14:19 UT" - Comet P/2010 R2 (La Sagra) - see below
MPEC 2010-S12 time-stamped "15:44 UT" - 2010 RK135 - see below
MPEC 2010-S13 time-stamped "15:50 UT" - 2010 SH - see below
MPEC 2010-S14 time-stamped "16:03 UT" - 2010 SJ - see below
MPEC 2010-S15 time-stamped "23:22 UT" - 2010 RG137

MPEC 2010-S15 - "23:22 UT" - 2010 RG137

K10RD7G 2010 RG137 (H=21.0 ~214m) was discovered at 0609 UT on 3 Sept. by the Mt. Lemmon Survey (MLS), which observed it at Sept. 3.26-28p4. The discovery was confirmed by the Spacewatch 1.8m telescope (Sept. 17.38-39p3), Bisei Spaceguard Center (Sept. 17.49-50p4), Guidestar Obs. (Sept. 17.81-82p2 & 17.90p1), and Raheny Obs. (Sept. 17.90-92p6).

MPEC 2010-S14 - "16:03 UT" - 2010 SJ

K10S00J 2010 SJ (small asteroid, H=23.3 ~74m) was discovered at 1024 UT on 16 Sept. by the Catalina Sky Survey (CSS), which observed it at Sept. 16.43-51p15. The discovery was confirmed by Astronomical Research Obs. Westfield (Sept. 17.26-28p3) and Sabino Canyon Obs. (Sept. 17.40p3).

MPEC 2010-S13 - "15:50 UT" - 2010 SH

K10S00H 2010 SH (small asteroid, H=23.2 ~78m) was discovered at 0942 UT on 16 Sept. by MLS, which observed it at Sept. 16.40-42p3 and 17.32-34p8.

MPEC 2010-S12 - "15:44 UT" - 2010 RK135

K10RD5K 2010 RK135 (risk-listed, H=25.6 ~26m) was discovered at 0845 UT on 15 Sept. by MLS, which observed it at Sept. 15.36-44p7 at V=21.1-7, 16.41-43p4 at V=21.0-22.3, and 17.35-38p4 at V=20.3-7.

MPEC 2010-S11 - "14:19 UT" - Comet P/2010 R2 (La Sagra)

PK10R020 P/2010 R2 (La Sagra) (q=2.625 AU, TP=2010 June 25.2933 TT) from La Sagra Obs. (Aug. 12.99-02p3, Sept. 14.87-89p3 & 16.01-02p4), CSS (Sept. 14.36-38p4), LINEAR (Sept. 15.22-27p5 & 16.29-34p10), Great Shefford Obs. (Sept. 16.96-97p3), ARO Westfield (Sept. 17.05p1 & 17.13-14p2), and Spacewatch 1.8m (Sept. 17.19-20p3)

<< DOU on 17 Sept. '10 >> MPEC 2010-S10 - "06:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K10RD0C 2010 RC130 (arc=1 day, H=21.6 ~162m) from LINEAR (Sept. 16.23-28p5)
K10R91A 2010 RA91 (small asteroid, arc=3 days, H=23.4 ~71m) from Spacewatch 1.8m (Sept. 16.29-30p3)
K10R80M 2010 RM80 (small asteroid, arc=5 days, H=28.0 ~9m) from Spacewatch 1.8m (Sept. 16.24-25p3)
K10R53K 2010 RK53 (small asteroid, arc=5 days, H=27.9 ~9m) from ARO Westfield (Sept. 15.22-24p3)
Observations of recently (no longer) risk-listed objects
K10R30Q 2010 RQ30 (arc=13 days, H=18.2 ~776m) from Spacewatch 1.8m (Sept. 16.32-33p3)
Observations of small asteroids (H>22.0)
K10S00E 2010 SE (arc=1 day, H=24.1 ~51m) from Great Shefford Obs. (Sept. 17.08-09p3)
K10R80T 2010 RT80 (arc=5 days, H=22.6 ~102m) from ARO Westfield (Sept. 15.12-14p5) and the Siding Spring Survey (SSS) (Sept. 16.61p1)
K10R80R 2010 RR80 (arc=5 days, H=22.4 ~112m) from Spacewatch 1.8m (Sept. 16.28p3)
K10R80Q 2010 RQ80 (arc=6 days, H=22.7 ~98m) from Spacewatch 1.8m (Sept. 16.42-43p3)
K10R64Q 2010 RQ64 (arc=4 days, H=26.2 ~19m) from the Spacewatch 0.9m telescope (Sept. 15.25-29p3) and ARO Westfield (Sept. 15.34-36p3)
K10R64P 2010 RP64 (arc=5 days, H=27.2 ~12m) from ARO Westfield (Sept. 15.35-36p3 at V=22.3-6)
K10R45X 2010 RX45 (arc=7 days, H=25.4 ~28m) from ARO Westfield (Sept. 15.31-34p3)
K10R43L 2010 RL43 (arc=10 days, H=24.3 ~47m) from Desert Moon Obs. (Sept. 16.19-24p3)
K10R43J 2010 RJ43 (arc=10 days, H=23.2 ~78m) from Spacewatch 1.8m (Sept. 16.34-35p3)
K10R04J 2010 RJ4 (arc=13 days, H=24.0 ~54m) from LINEAR (Sept. 16.35-40p5)
K10R00F 2010 RF (arc=15 days, H=23.0 ~85m) from MLS (Sept. 16.29-31p3)
K10R00D 2010 RD (arc=15 days, H=25.4 ~28m) from Spacewatch 1.8m (Sept. 16.20-21p3)
K10R00C 2010 RC (arc=15 days, H=26.4 ~18m) from Spacewatch 1.8m (Sept. 16.44-45p3 at V=22.6)
K10P02Q 2010 PQ2 (arc=43 days, H=24.5 ~43m) from ARO Westfield (Sept. 15.38-42p3 at V=21.9-22.2)
Observations of almost-small asteroids (21.7<H<=22.0)
K10R12E 2010 RE12 (arc=13 days, H=22.0 ~135m) from MLS (Sept. 16.29-31p3)
Observations of other objects
K10R82O 2010 RO82 (Q=4.002 AU, arc=6 days, H=16.9 ~1.41 km) from SSS (Sept. 16.51p1)
K10R80P 2010 RP80 (Q=4.992 AU, arc=6 days, H=20.7 ~245m) from MLS (Sept. 16.40-42p4)
K10R80N 2010 RN80 (arc=6 days, H=20.3 ~295m) from ARO Westfield (Sept. 15.09-11p3)
K10R42M 2010 RM42 (i=38.9°, arc=11 days, H=18.3 ~741m) from Desert Moon Obs. (Sept. 16.40-42p3) and CSS (Sept. 16.41-43p3)
K10R42K 2010 RK42 (Q=4.412 AU, arc=11 days, H=18.6 ~645m) from CSS (Sept. 16.40-43p4)
K10Q02D 2010 QD2 (arc=26 days, H=17.5 ~1.07 km) from Desert Moon Obs. (Sept. 16.44-48p5)
K10P10M 2010 PM10 (arc=41 days, H=19.7 ~389m) from Castelmartini Obs. (Sept. 3.93p3) and Spacewatch 0.9m (Sept. 16.36-40p3)
K10OA1L 2010 OL101 (Q=4.169 AU, arc=51 days, H=20.2 ~309m) from Spacewatch 1.8m (Sept. 16.18-19p3)
K10OA1F 2010 OF101 (arc=55 days, H=19.6 ~407m) from Spacewatch 1.8m (Sept. 16.12-13p3)
K10OA1D 2010 OD101 (arc=55 days, H=20.9 ~224m) from Spacewatch 0.9m (Sept. 16.37-40p3)
K10O22E 2010 OE22 (Q=4.312 AU, arc=61 days, H=21.3 ~186m) from Spacewatch 1.8m (Sept. 16.15-16p3 at V=22.4-6)
K10O00C 2010 OC (Q=4.704 AU, arc=57 days, H=19.1 ~513m) from WISE (Sept. 10.91p1, 11.04p1, 11.30p1, 11.44p2, 11.57p1, 11.90p1, 11.96p1, 12.10p1, 12.23p1, 12.29p1, 12.36p1, 12.43p1, 12.49p1, 12.63p1, 13.09p1, 13.22p1, 13.29p1, 13.35p1, 13.42p1, 13.55p1, 13.68p1, 13.75p1, 14.01p1, 14.15p1, 14.28p1 & 14.41p1)
K10N01Z 2010 NZ1 (arc=3 opp, H=19.6 ~407m) from Spacewatch 1.8m (Sept. 16.31p3)
K10L63Y 2010 LY63 (arc=4 opp, H=17.7 ~977m) from Hamamatsu-Yuto Obs. (Sept. 16.47-51p11)
K10H80Q 2010 HQ80 (arc=142 days, H=19.7 ~389m) from Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) (Sept. 14.15-16p3)
K07S00J 2007 SJ (arc=5 opp, H=16.6 ~1.62 km) from MLS (Sept. 16.32-34p4)
K07B49G 2007 BG49 (arc=3 opp, H=18.6 ~645m) from Spacewatch 0.9m (Sept. 16.19-22p3)
K06B06N 2006 BN6 (Q=4.353 AU, arc=5 opp, H=17.4 ~1.12 km) from LINEAR (Sept. 16.23-28p4)
K05G59E 2005 GE59 (arc=4 opp, H=18.0 ~851m) from Castelmartini Obs. (Sept. 3.95p3), LINEAR (Sept. 16.36-41p5), and Hamamatsu-Yuto Obs. (Sept. 16.72-75p7)
K03M04J 2003 MJ4 (arc=2 opp, H=18.8 ~589m) from Castelmartini Obs. (Sept. 4.05p3)
K03F05C 2003 FC5 (arc=5 opp, H=18.2 ~776m) from CSS (Sept. 16.25-27p4)
K02E02Y 2002 EY2 (arc=4 opp, H=19.3 ~467m) from Castelmartini Obs. (Sept. 4.09-10p3)
K01X00D 2001 XD (arc=6 opp, H=18.4 ~708m) from Spacewatch 0.9m (Sept. 16.49-50p2)
J99T05B 1999 TB5 (arc=4 opp, H=18.9 ~562m) from LINEAR (Sept. 16.29-33p4)
J97G28H 1997 GH28 (arc=6 opp, H=17.8 ~933m) from St. Pardon de Conques Obs. (Sept. 13.07-08p3)
J97G03L 1997 GL3 (Q=4.057 AU, arc=2 opp, H=19.2 ~490m) from Vicksburg Obs. (Sept. 15.29p3) and Hamamatsu-Yuto Obs. (Sept. 16.62-67p10)
O3147 243147 2007 TX18 from LINEAR (Sept. 16.35-40p4) and CSS (Sept. 16.43-46p4)
O2211 242211 2003 QB90 from Castelmartini Obs. (Sept. 3.97-98p3) and CSS (Sept. 16.37-39p4)
L9071 219071 1997 US9 from LINEAR (Sept. 16.42-47p5)
J0208 190208 2006 AQ from David Tholen's team on Mauna Kea (May 16.51p3 at R=22.3-6)
G4121 164121 2003 YT1 from WISE (Sept. 11.72p1, 11.86p2, 11.99p1, 12.25p1, 12.39p1, 12.98p1, 13.05p1, 13.18p1, 13.25p1 & 13.31p1)
G2913 162913 2001 MT18 from Spacewatch 0.9m (Sept. 15.26-29p3 & 16.25-28p3)
F4029 154029 2002 CY46 from Castelmartini Obs. (Sept. 3.95-96p3), An Carraig Obs. (Sept. 16.86-87p3), and Mt. Tuffley Obs. (Sept. 17.01-02p3)
F3842 153842 2001 XT30 from Castelmartini Obs. (Sept. 4.04p3)
F2952 152952 2000 GC2 from Castelmartini Obs. (Sept. 3.98p3)
F2558 152558 1990 SA from Urseanu Obs. (Sept. 15.87-90p6) and Mt. Tuffley Obs. (Sept. 16.97p3)
D9345 139345 2001 KA67 from Desert Moon Obs. (Sept. 16.50p2)
D8847 138847 2000 VE62 from LINEAR (Sept. 16.29-34p5)
89830 89830 2002 CE from Castelmartini Obs. (Sept. 4.08-09p3)
66146 66146 1998 TU3 from Castelmartini Obs. (Sept. 4.02-03p3)
66008 66008 1998 QH2 from CSS (Sept. 16.34-36p4)
52768 52768 1998 OR2 from Spacewatch 0.9m (Sept. 15.25-29p2)
19764 19764 2000 NF5 from Nerpio Obs. (Sept. 14.90p5 & 15.90-91p5), Vicksburg Obs. (Sept. 15.30-32p6), Hamamatsu-Yuto Obs. (Sept. 16.67-70p10), and Mt. Tuffley Obs. (Sept. 16.00-01p3)
12538 12538 1998 OH from LINEAR (Sept. 16.30-35p5)
06611 6611 1993 VW from MLS (Sept. 16.17-20p4)
06239 6239 Minos (1989 QF) from Nerpio Obs. (Sept. 14.92-93p5) and Mt. Tuffley Obs. (Sept. 16.98-99p3)
04954 4954 Eric (1990 SQ) from Castelmartini Obs. (Sept. 4.11p3) and Mt. Tuffley Obs. (Sept. 17.02-03p3)
04197 4197 1982 TA from Castelmartini Obs. (Sept. 4.01p3), LINEAR (Sept. 16.41-46p4), and Vicksburg Obs. (Sept. 16.44-46p3)
03200 3200 Phaethon (1983 TB) from CSS (Sept. 16.47-49p4)
03122 3122 Florence (1981 ET3) from Mt. Tuffley Obs. (Sept. 16.98p3)
02212 2212 Hephaistos (1978 SB) from Hamamatsu-Yuto Obs. (Sept. 16.75-77p6) and Mt. Tuffley Obs. (Sept. 17.03-04p3)
02100 2100 Ra-Shalom (1978 RA) from Castelmartini Obs. (Sept. 4.06p3)
01566 1566 Icarus (1949 MA) from WISE (Sept. 12.66p1, 12.79p1, 12.85p1, 12.92p2, 12.99p1 & 13.12p1)

MPEC 2010-S09 - "01:28 UT" - 2010 SF

K10S00F 2010 SF (small asteroid, Earth MOID=5.5 LD, H=25.6 ~26m) was discovered at 1108 UT on 16 Sept. by CSS, which observed it at Sept. 16.43-51p10. The discovery was confirmed by Great Shefford Obs. (Sept. 16.92-93p4). This object is now within ten lunar distances (LD) of Earth, reaching 8.3 LD on 17 Sept.

MPEC 2010-S08 - "01:21 UT" - 2010 SE

K10S00E 2010 SE (small asteroid, Earth MOID=3.2 LD, H=24.1 ~51m) was discovered at 1028 UT on 16 Sept. by CSS, which observed it at Sept. 16.44-46p3 and 16.50-51p10. The discovery was confirmed by Great Shefford Obs. (Sept. 16.93-94p3). This object is now within ten lunar distances (LD) of Earth, reaching 5.6 LD on 19 Sept.

MPEC 2010-S07 - "01:18 UT" - 2010 SD

K10S00D 2010 SD (risk-listed, Earth MOID=8.1 LD, H=24.8 ~37m) was discovered at 0919 UT on 16 Sept. by MLS, which observed it at Sept. 16.39-40p4. The discovery was confirmed by Great Shefford Obs. (Sept. 16.89-90p3). This object will be coming within ten lunar distances (LD) of Earth, reaching 9.6 LD on 24 Sept.

MPEC 2010-S06 - "01:16 UT" - 2010 SC

K10S00C 2010 SC (small asteroid, Earth MOID=9.7 LD, H=26.0 ~21m) was discovered at 0659 UT on 16 Sept. by MLS, which observed it at Sept. 16.29-31p4 and 16.36-38p4. The discovery was confirmed by Great Shefford Obs. (Sept. 16.90-91p3).

MPEC 2010-S05 - "01:13 UT" - 2010 SB

K10S00B 2010 SB (borderline-small, Q=4.614 AU, H=21.9 ~141m) was discovered at 0656 UT on 16 Sept. by MLS, which observed it at Sept. 16.29-31p4 and 16.36-38p3. The discovery was confirmed by Great Shefford Obs. (Sept. 16.98-00p3).

Observers on 17 September '10

A total of 25 observing facilities appear in today's MPECs.

Code	Observer / observatory
`J16`	An Carraig Obs. in Northern Ireland, 1 in MPEC 2010-S10 -- 154029
`H21`	Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2010-S10, 2010-S11 & 2010-S14 -- 2010 SJ, 2010 RX45, 2010 RT80, 2010 RQ64, 2010 RP64, 2010 RN80, 2010 RK53, P/2010 R2, 2010 PQ2
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2010-S15 -- 2010 RG137
`160`	Castelmartini Obs. in Italy, 13 in MPEC 2010-S10 -- 2010 PM10, 2005 GE59, 2003 MJ4, 2002 EY2, 89830, 66146, 242211, 154029, 153842, 152952, 4954, 4197, 2100
`703`	Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2010-S08, 2010-S09, 2010-S10, 2010-S11 & 2010-S14 -- 2010 SJ, 2010 SF, 2010 SE, 2010 RM42, 2010 RK42, P/2010 R2, 2003 FC5, 66008, 243147, 242211, 3200
`448`	Desert Moon Obs. in New Mexico, 4 in MPEC 2010-S10 -- 2010 RM42, 2010 RL43, 2010 QD2, 139345
`J95`	Great Shefford Obs. in England, 6 in MPECs 2010-S05, 2010-S06, 2010-S07, 2010-S08, 2010-S09, 2010-S10 & 2010-S11 -- 2010 SF, 2010 SE, 2010 SD, 2010 SC, 2010 SB, P/2010 R2
`A17`	Guidestar Obs. in Germany, 1 in MPEC 2010-S15 -- 2010 RG137
`379`	Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2010-S10 -- 2010 LY63, 2005 GE59, 1997 GL3, 19764, 2212
`695]`	Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2010-S10 -- 2010 HQ80
`704`	LINEAR in New Mexico, 11 in MPECs 2010-S10 & 2010-S11 -- 2010 RJ4, 2010 RC130, P/2010 R2, 2006 BN6, 2005 GE59, 1999 TB5, 243147, 219071, 138847, 12538, 4197
`J75`	La Sagra Obs. in Spain, 1 in MPEC 2010-S11 -- P/2010 R2
`5682`	David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-S10 -- 190208
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2010-S05, 2010-S06, 2010-S07, 2010-S10, 2010-S12, 2010-S13 & 2010-S15 -- 2010 SH, 2010 SD, 2010 SC, 2010 SB, 2010 RP80, 2010 RK135, 2010 RG137, 2010 RF, 2010 RE12, 2007 SJ, 6611
`J93`	Mt. Tuffley Obs. in England, 7 in MPEC 2010-S10 -- 19764, 154029, 152558, 6239, 4954, 3122, 2212
`I89`	Nerpio Obs., 2 in MPEC 2010-S10 -- 19764, 6239
`J41`	Raheny Obs. in Ireland, 1 in MPEC 2010-S15 -- 2010 RG137
`854`	Sabino Canyon Obs. in Arizona, 1 in MPEC 2010-S14 -- 2010 SJ
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2010-S10 -- 2010 RT80, 2010 RO82
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2010-S10 -- 2010 RQ64, 2010 PM10, 2010 OD101, 2007 BG49, 2001 XD, 52768, 162913
`291`	Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2010-S10, 2010-S11 & 2010-S15 -- 2010 RR80, 2010 RQ80, 2010 RQ30, 2010 RM80, 2010 RJ43, 2010 RG137, 2010 RD, 2010 RC, 2010 RA91, P/2010 R2, 2010 OL101, 2010 OF101, 2010 OE22, 2010 NZ1
`I93`	St. Pardon de Conques Obs., 1 in MPEC 2010-S10 -- 1997 GH28
`A92`	Urseanu Obs. in Romania, 1 in MPEC 2010-S10 -- 152558
`H47`	Vicksburg Obs. in Mississippi, 3 in MPEC 2010-S10 -- 1997 GL3, 19764, 4197
`C51`	WISE in Earth polar orbit, 3 in MPEC 2010-S10 -- 2010 OC, 164121, 1566

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

Impact Risk Monitoring on 17 September '10

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS at 2358 and JPL at 2359 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 is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) 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

2010 SD	NEODyS	1820	2014-2090	197	1.25e-08	-6.97	-8.01	0	NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2010/09/16.390 to 2010/09/16.897."
2010 SD	JPL Sentry	1500	2014-2107	331	1.7e-07	-6.18	-7.35	0	JPL: "Analysis based on 7 observations spanning .50771 days (2010-Sep-16.38875 to 2010-Sep-16.89646)." Diameter approximately 0.044 km. from mean, weighted H=24.4.

2010 RK135	JPL Sentry	1820	2092	1	1.5e-07	-7.44	-7.44	0	JPL: "Analysis based on 15 observations spanning 2.0122 days (2010-Sep-15.36462 to 2010-Sep-17.37682)." Diameter approximately 0.025 km. from mean, weighted H=25.6.

2010 RD130	NEODyS	1500	2021-2089	3	1.95e-10	-9.28	-9.55	0	NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2010/09/15.361 to 2010/09/16.345."
2010 RD130	JPL Sentry	0037	2021-2110	13	4.4e-09	-8.06	-8.25	0	JPL: "Analysis based on 8 observations spanning .98360 days (2010-Sep-15.3606 to 2010-Sep-16.3442)." Diameter approximately 0.034 km. from mean, weighted H=25.0.

2010 RC130	JPL Sentry	1500	2084	2	3.3e-07	-5.03	-5.30	0	JPL: "Analysis based on 26 observations spanning 1.2505 days (2010-Sep-15.21025 to 2010-Sep-16.46079)." Diameter approximately 0.170 km. from mean, weighted H=21.5.
2010 RC130	NEODyS	1500	2084	2	1.6e-07	-5.38	-5.61	0	NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2010/09/15.211 to 2010/09/16.462."

2010 RA91	JPL Sentry	1500	2083-2109	4	2.1e-08	-7.26	-7.34	0	JPL: "Analysis based on 33 observations spanning 3.1041 days (2010-Sep-13.19605 to 2010-Sep-16.30012)." Diameter approximately 0.068 km. from mean, weighted H=23.5.
2010 RA91	NEODyS	1500	2073-2083	2	5.83e-10	-8.73	-8.82	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2010/09/13.197 to 2010/09/16.301."

2010 RM80	JPL Sentry	1500	2085-2110	18	1.7e-05	-6.69	-7.23	0	JPL: "Analysis based on 38 observations spanning 4.9620 days (2010-Sep-11.28495 to 2010-Sep-16.24692)." Diameter approximately 0.009 km. from mean, weighted H=28.0.
2010 RM80	NEODyS	1500	2085	1	4.3e-07	-8.17	-8.17	0	NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2010/09/11.286 to 2010/09/16.248."

2010 RK53	NEODyS	1500	2024-2033	4	1.54e-05	-5.93	-5.95	0	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2010/09/10.417 to 2010/09/15.241."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

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 17 September '10

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

2359	Grabbed MPEC 2010-S15 - 2010 RG137 - see above
1820	Noted that JPL Sentry has posted 2010 RK135 as an impact risk - see above Noted that NEODyS has posted 2010 SD as an impact risk - see above Grabbed MPEC 2010-S12 - 2010 RK135 - see above Grabbed MPEC 2010-S13 - 2010 SH - see above Grabbed MPEC 2010-S14 - 2010 SJ - see above
1500	Noted that JPL Sentry has updated its 2010 RA91 risk assessment - see above Noted that NEODyS has updated its 2010 RA91 risk assessment - see above Noted that JPL Sentry has updated its 2010 RC130 risk assessment - see above Noted that NEODyS has posted 2010 RC130 as an impact risk - see above Noted that NEODyS has posted 2010 RD130 as an impact risk - see above Noted that NEODyS has updated its 2010 RK53 risk assessment - see above Noted that JPL Sentry has updated its 2010 RM80 risk assessment - see above Noted that NEODyS has updated its 2010 RM80 risk assessment - see above Noted that JPL Sentry has posted 2010 SD as an impact risk - see above Grabbed MPEC 2010-S10 - Daily Orbit Update - see above Grabbed MPEC 2010-S11 - Comet P/2010 R2 (La Sagra) - see above
0204	Grabbed MPEC 2010-S05 - 2010 SB - see above Grabbed MPEC 2010-S06 - 2010 SC - see above Grabbed MPEC 2010-S07 - 2010 SD - see above Grabbed MPEC 2010-S08 - 2010 SE - see above Grabbed MPEC 2010-S09 - 2010 SF - see above
0037	Noted that JPL Sentry has posted 2010 RD130 as an impact risk - see above

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