2009-12-12 Tracking News

Contents on 12 December '09

IAU Minor Planet Center
- NEOCP Activity -- four listings: 1 new, 3 updated
- New MPECs -- eight MPECs
Observers -- 31 observing facilities
Impact Risk Monitoring -- four objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
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 12 December '09

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and three updated listings. All of these were "one nighters." The Tracking News counted a total of ten listings on the NEOCP at some point on this day.

New MPECs on 12 December '09

Minor Planet Electronic Circulars

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

MPEC 2009-X40 time-stamped "07:09 UT" - Daily Orbit Update - see below
MPEC 2009-X41 time-stamped "14:13 UT" - 2009 XZ1 - see below
MPEC 2009-X42 time-stamped "14:16 UT" - 2009 XA2 - see below
MPEC 2009-X43 time-stamped "14:18 UT" - 2009 XB2 - see below
MPEC 2009-X44 time-stamped "14:21 UT" - 2009 XC2 - see below
MPEC 2009-X45 time-stamped "17:32 UT" - Twelve Sungrazing Comets - see below
MPEC 2009-X46 time-stamped "22:18 UT" - 2009 XF2 - see below
MPEC 2009-X47 time-stamped "22:41 UT" - Comet P/2009 U6 = 1997 A2 = 2002 Q15 (LINEAR)

MPEC 2009-X47 - "22:41 UT" - Comet P/2009 U6 = 1997 A2 = 2002 Q15 (LINEAR)

PK09U060 P/2009 U6 (LINEAR) (q=1.486 AU, Q=5.312 AU, TP=2009 Aug. 8.82330 TT) from Kiev Comet Station (Nov. 27.10-11p2)
PK02Q150 P/2002 Q15 (q=1.566 AU, Q=5.382 AU, TP=2003 Mar. 3.01903 TT) from NEAT's Mt. Palomar telescope (2002 July 24.49p1, 2002 Aug. 20.32-36p3, 2002 Aug. 31.30p1, 2002 Sept. 9.32-37p3 & 2002 Sept. 16.23-29p3) and NEAT's USAF Haleakala telescope (2002 Aug. 11.40-42p3 & 2002 Aug. 17.59-61p3)
PJ97A020 P/1997 A2 (q=1.571 AU, Q=5.387 AU, TP=1996 Sept. 4.60151 TT) from NEAT's GEODSS Haleakala telescope (1997 Jan. 10.52-54p3 & 1997 Jan. 11.47-49p3)

MPEC 2009-X46 - "22:18 UT" - 2009 XF2

K09X02F 2009 XF2 (risk-listed, Q=4.182 AU, H=19.9 ~355m) was discovered at 0621 UT on 12 Dec. by LINEAR, which observed it at Dec. 12.27-32p4. The discovery was confirmed by Great Shefford Obs. (Dec. 12.90-91p4).

MPEC 2009-X45 - "17:32 UT" - Twelve Sungrazing Comets

CK09E040 C/2009 E4 from the HI1-A instrument (4) aboard STEREO-A (March 9.43-54p10 & 9.60p2)
CK09E020 C/2009 E2 from STEREO-A/HI1-A (4) (Feb. 28.49-63p12, 28.68p2 & 28.77-79p4)
CK09D070 C/2009 D7 from STEREO-A/HI1-A (4) (Feb. 25.35-79p34, 25.85p2 & 25.91-43p40)
CK09D050 C/2009 D5 from STEREO-A/HI1-A (4) (Feb. 23.13-29p14 & 23.35-38p4)
CK09D040 C/2009 D4 from STEREO-A/HI1-A (4) (Feb. 21.02-10p8, 21.18-24p6, 21.32-16p62 & 22.21-32p10)
CK09D030 C/2009 D3 from STEREO-A/HI1-A (4) (Feb. 18.49-60p10, 18.66p2, 18.71-74p4, 18.79-85p6 & 18.91p2)
CK09D020 C/2009 D2 from STEREO-A/HI1-A (4) (Feb. 18.52p2, 18.57-71p12 & 18.77p2)
CK09C040 C/2009 C4 from STEREO-A/HI1-A (4) (Feb. 7.38-41p4, 7.52-79p22 & 7.85-27p32)
CK09C030 C/2009 C3 from STEREO-A/HI1-A (4) (Feb. 3.54p2, 3.60-63p4, 3.74p2, 3.91-02p10, 4.07-32p20, 4.68p2, 4.74p2, 4.79p2 & 4.91p2), the COR2-B instrument (5) aboard STEREO-B (Feb. 4.64p2, 4.70-72p4, 4.77-83p8, 4.87-89p4, 4.93-95p4, 5.06-10p6 & 5.16-52p34), and the COR2-A instrument (5) aboard STEREO-A (Feb. 5.06-49p44)
CK09B110 C/2009 B11 from STEREO-A/HI1-A (4) (Jan. 30.10-21p10, 30.27-35p8, 30.41-49p8, 30.54p2 & 30.60p2)
CK09B090 C/2009 B9 from STEREO-A/HI1-A (4) (Jan. 28.66p2 & 28.71-74p4)
CK09B080 C/2009 B8 from STEREO-A/HI1-A (4) (Jan. 20.21p2, 20.29-43p12, 20.52-54p4, 20.63-66p4, 20.79-82p4 & 20.93p2)

MPEC 2009-X44 - "14:21 UT" - 2009 XC2

K09X02C 2009 XC2 (risk-listed, H=16.9 ~1.41 km) was discovered at 1036 UT on 11 Dec. by LINEAR, which observed it at Dec. 11.44-49p5. The discovery was confirmed by Monte Baldo Obs. (Dec. 12.03p3), La Canada Obs. (Dec. 12.07-09p3), La Sagra Obs. (Dec. 12.19-25p5), and Tenagra II Obs. (Dec. 12.49-50p3).

MPEC 2009-X43 - "14:18 UT" - 2009 XB2

K09X02B 2009 XB2 (H=20.7 ~245m) was discovered at 0931 UT on 11 Dec. by the Catalina Sky Survey (CSS), which observed it at Dec. 11.40-41p4. The discovery was confirmed by McCarthy Obs. (Dec. 12.28-30p3) and Tenagra II Obs. (Dec. 12.48-49p3).

MPEC 2009-X42 - "14:16 UT" - 2009 XA2

K09X02A 2009 XA2 (small asteroid, H=23.2 ~78m) was discovered at 0750 UT on 11 Dec. by CSS, which observed it at Dec. 11.29-35p8. The discovery was confirmed by Tenagra II Obs. (Dec. 11.43p3 & 12.40-42p3), the Mt. Lemmon Survey (MLS) (Dec. 12.19p4), and Astronomical Research Obs. Westfield (ARO Westfield) (Dec. 12.21-22p3).

MPEC 2009-X41 - "14:13 UT" - 2009 XZ1

K09X01Z 2009 XZ1 (H=21.5 ~170m) was discovered at 0704 UT on 11 Dec. by CSS, which observed it at Dec. 11.29-32p4. The discovery was confirmed by Tenagra II Obs. (Dec. 11.40-42p3 & 12.34p3), MLS (Dec. 12.18-19p4), ARO Westfield (Dec. 12.19-20p4), and McCarthy Obs. (Dec. 12.20-21p3).

<< DOU on 12 Dec. '09 >> MPEC 2009-X40 - "07:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K09X00O 2009 XO (arc=3 days, H=20.0 ~339m) from ARO Westfield (Dec. 11.24-25p4) and McCarthy Obs. (Dec. 12.16-17p3)
Observations of recently (no longer) risk-listed objects
K09W51X 2009 WX51 (Q=5.343 AU, arc=20 days, H=20.2 ~309m) from Doc Greiner Research Obs. (DGRO) (Dec. 12.02-03p5)
K09W06R 2009 WR6 (arc=23 days, H=18.4 ~708m) from ARO Westfield (Dec. 11.43-44p3)
K09W00F 2009 WF (arc=26 days, H=19.9 ~355m) from DGRO (Dec. 12.11-12p8)
J98H03J 1998 HJ3 (arc=2 opp, H=18.8 ~589m) from Castelmartini Obs. (Dec. 10.93-94p3)
Observations of small asteroids (H>22.0)
K09W11D 2009 WD11 (arc=22 days, H=22.1 ~129m) from McCarthy Obs. (Dec. 12.18-19p5)
K09U17Z 2009 UZ17 (arc=50 days, H=22.4 ~112m) from ARO Westfield (Dec. 11.13-18p3 at V=22.3-6)
K09SA4L 2009 SL104 (arc=76 days, H=23.4 ~71m) from ARO Westfield (Dec. 11.38-42p3 at V=22.3-5)
K03S84M 2003 SM84 (arc=2 opp, H=22.7 ~98m) from the Spacewatch 1.8m telescope (Sept. 16.38-39p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K09R01V 2009 RV1 (Q=4.417 AU, arc=90 days, H=21.9 ~141m) from ARO Westfield (Dec. 11.44-48p3 at V=22.3-6)
Observations of other objects
K09X01W 2009 XW1 from Nazaret Obs. (Dec. 9.08-10p3 discovery & Dec. 11.03-05p3)
K09X00V 2009 XV (Q=4.299 AU, arc=3 days, H=21.0 ~214m) from LINEAR (Dec. 11.43-49p10) and McCarthy Obs. (Dec. 12.23-24p4)
K09X00D 2009 XD (Q=4.174 AU, arc=5 days, H=18.7 ~616m) from La Sagra Obs. (Dec. 8.90-93p3), Castelmartini Obs. (Dec. 10.90p3), LINEAR (Dec. 11.25-30p5), CSS (Dec. 11.30-32p4), Balzaretto Obs. (Dec. 11.77-78p3), McCarthy Obs. (Dec. 12.05-06p3), and DGRO (Dec. 12.12-13p10)
K09WD9M 2009 WM139 (arc=144 days, H=18.6 ~645m) from the Spacewatch 0.9m telescope (July 14.42-45p3) and the Siding Spring Survey (SSS) (Aug. 15.57-58p3 & 15.65-71p8)
K09WA6D 2009 WD106 (arc=2 opp, H=18.7 ~616m) from the Sloan Digital Sky Survey (SDSS) (2001 March 19.20p2 at V=21.51-22.06)
K09WA4Z 2009 WZ104 (arc=17 days, H=20.5 ~269m) from San Benedetto Po Obs. (Dec. 9.78p4), Castelmartini Obs. (Dec. 10.77-78p3), DGRO (Dec. 11.00-01p20), and McCarthy Obs. (Dec. 12.09-12p9)
K09W26C 2009 WC26 (arc=19 days, H=17.2 ~1.23 km) from La Sagra Obs. (Dec. 10.85-87p3) and Tenagra II Obs. (Dec. 11.20p3)
K09W25W 2009 WW25 (arc=86 days, H=20.6 ~257m) from Castelmartini Obs. (Dec. 10.81-82p3), CSS (Dec. 11.12-14p4), and DGRO (Dec. 12.01p3)
K09W06O 2009 WO6 (Q=4.882 AU, arc=54 days, H=17.3 ~1.17 km) from McCarthy Obs. (Dec. 12.07p2)
K09W01L 2009 WL1 (arc=25 days, H=18.7 ~616m) from DGRO (Dec. 12.09-10p6)
K09T10G 2009 TG10 (i=40.9°, arc=2 opp, H=17.3 ~1.17 km) from MLS (2006 Oct. 4.16-19p4 & 2006 Oct. 4.24-25p4)
K09T08G 2009 TG8 (arc=2 opp, H=19.1 ~513m) from NEAT/Palomar (2004 Oct. 10.30-35p3)
K09SM9D 2009 SD229 (arc=73 days, H=19.1 ~513m) from ARO Westfield (Dec. 11.09-12p3 at V=22.1-5)
K09S98N 2009 SN98 (arc=2 opp, H=19.1 ~513m) from LONEOS (1999 Feb. 18.45-49p3)
K09S19U 2009 SU19 (q=0.209 AU, arc=2 opp, H=17.9 ~891m) from Marc W. Buie via Kitt Peak Natl. Obs. (KPNO) (2003 Oct. 22.13p1 & 2003 Oct. 22.19p1)
K09S19T 2009 ST19 (arc=2 opp, H=18.3 ~741m) from LONEOS (1998 Nov. 19.17-19p3)
K09Q36B 2009 QB36 (Q=4.007 AU, arc=2 opp, H=17.6 ~1.02 km) from SDSS (2002 Oct. 11.21p2 at V=21.44-22.11)
K09Q34D 2009 QD34 (arc=107 days, H=18.1 ~812m) from CSS (Dec. 10.33-36p4 & 11.33-35p4)
K09N00A 2009 NA (Q=4.129 AU, arc=163 days, H=17.6 ~1.02 km) from LINEAR (Dec. 10.26-31p5)
K09E01K 2009 EK1 (arc=2 opp, H=21.4 ~178m) from SDSS (2001 Dec. 18.36p2)
K08A28X 2008 AX28 (arc=2 opp, H=20.0 ~339m) from Spacewatch 0.9m (2000 Sept. 3.20-25p3)
K06X00A 2006 XA (arc=3 opp, H=17.3 ~1.17 km) from MLS (Dec. 10.21-23p4) and CSS (Dec. 11.30-32p4)
K06U00R 2006 UR (arc=2 opp, H=19.3 ~467m) from LINEAR (Dec. 11.32-37p4)
K06K21Q 2006 KQ21 (arc=2 opp, H=18.7 ~616m) from MLS (March 22.27-28p4 at V=21.6-22.1)
K06A04O 2006 AO4 (Q=4.162 AU, arc=4 opp, H=15.4 ~2.82 km, q=1.098 AU) from LINEAR (Dec. 11.44-49p5)
K05U00B 2005 UB (arc=4 opp, H=16.6 ~1.62 km) from ARO Westfield (Dec. 11.26-29p3 at V=21.9-22.1)
K04X35M 2004 XM35 (arc=2 opp, H=19.8 ~371m) from La Sagra Obs. (Dec. 10.85-87p3) and Castelmartini Obs. (Dec. 10.88p3)
K02W00P 2002 WP (arc=3 opp, H=18.5 ~676m) from Castelmartini Obs. (Dec. 10.87p3) and DGRO (Dec. 12.05p10)
J99R45M 1999 RM45 (arc=4 opp, H=19.4 ~446m) from ARO Westfield (Dec. 11.31-36p3 at V=22.0-22.5)
M6219 226219 2002 VT85 from MLS (Dec. 10.29-31p4)
M5586 225586 2000 WS67 from MLS (Dec. 10.21-24p4)
M5416 225416 1999 YC from CSS (Dec. 10.29-31p4)
L5188 215188 2000 NM from CSS (Dec. 11.37-39p4)
G2998 162998 2001 SK162 from Castelmartini Obs. (Dec. 10.76p3)
F4244 154244 2002 KL6 from MLS (Dec. 10.15-16p4)
D8893 138893 2000 YH66 from CSS (Dec. 11.40-41p4)
99248 99248 2001 KY66 from CSS (Dec. 10.38-40p4)
85839 85839 1998 YO4 from LINEAR (Dec. 11.44-49p5)
54789 54789 2001 MZ7 from Grove Creek Obs. (Dec. 11.62-63p3)
54401 54401 2000 LM from Chante-Perdrix Obs. (Dec. 10.77-79p3) and CSS (Dec. 11.11-13p4)
17274 17274 2000 LC16 from CSS (Dec. 11.11-13p4)
16816 16816 1997 UF9 from CSS (Dec. 10.12-14p4)
04015 4015 Wilson-Harrington (1979 VA) from Gualba Obs. (Dec. 10.73-74p2 & 11.75-76p2), Castelmartini Obs. (Dec. 10.76p3), and La Vara Obs. (Dec. 11.82p3)
03553 3553 Mera (1985 JA) from CSS (Dec. 11.11-13p4)
03200 3200 Phaethon (1983 TB) from Castelmartini Obs. (Dec. 10.79p3)

Observers on 12 December '09

A total of 31 observing facilities appeared in this day's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 10 in MPECs 2009-X40, 2009-X41 & 2009-X42 -- 2009 XZ1, 2009 XO, 2009 XA2, 2009 WR6, 2009 UZ17, 2009 SL104, 2009 SD229, 2009 RV1, 2005 UB, 1999 RM45
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2009-X40 -- 2009 XD
`160`	Castelmartini Obs. in Italy, 9 in MPEC 2009-X40 -- 2009 XD, 2009 WZ104, 2009 WW25, 2004 XM35, 2002 WP, 1998 HJ3, 162998, 4015, 3200
`703`	Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2009-X40, 2009-X41, 2009-X42 & 2009-X43 -- 2009 XZ1, 2009 XD, 2009 XB2, 2009 XA2, 2009 WW25, 2009 QD34, 2006 XA, 99248, 54401, 225416, 215188, 17274, 16816, 138893, 3553
`A77`	Chante-Perdrix Obs. in France, 1 in MPEC 2009-X40 -- 54401
`H26`	Doc Greiner Research Obs. (DGRO) in Wisconsin, 7 in MPEC 2009-X40 -- 2009 XD, 2009 WZ104, 2009 WX51, 2009 WW25, 2009 WL1, 2009 WF, 2002 WP
`J95`	Great Shefford Obs. in England, 1 in MPEC 2009-X46 -- 2009 XF2
`E16`	Grove Creek Obs. in New South Wales, 1 in MPEC 2009-X40 -- 54789
`442`	Gualba Obs. in Spain, 1 in MPEC 2009-X40 -- 4015
`585`	Kiev Comet Station in the Ukraine, 1 in MPEC 2009-X47 -- P/2009 U6
`6951`	Marc W. Buie via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2009-X40 -- 2009 SU19
`704`	LINEAR in New Mexico, 8 in MPECs 2009-X40, 2009-X44 & 2009-X46 -- 2009 XV, 2009 XF2, 2009 XD, 2009 XC2, 2009 NA, 2006 UR, 2006 AO4, 85839
`699`	LONEOS in Arizona, 2 in MPEC 2009-X40 -- 2009 ST19, 2009 SN98
`J87`	La Canada Obs. in Spain, 1 in MPEC 2009-X44 -- 2009 XC2
`J75`	La Sagra Obs. in Spain, 4 in MPECs 2009-X40 & 2009-X44 -- 2009 XD, 2009 XC2, 2009 WC26, 2004 XM35
`J38`	La Vara Obs. in Spain, 1 in MPEC 2009-X40 -- 4015
`932`	McCarthy Obs. in Connecticut, 8 in MPECs 2009-X40, 2009-X41 & 2009-X43 -- 2009 XZ1, 2009 XV, 2009 XO, 2009 XD, 2009 XB2, 2009 WZ104, 2009 WO6, 2009 WD11
`A99`	Monte Baldo Obs. in Italy, 1 in MPEC 2009-X44 -- 2009 XC2
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2009-X40, 2009-X41 & 2009-X42 -- 2009 XZ1, 2009 XA2, 2009 TG10, 2006 XA, 2006 KQ21, 226219, 225586, 154244
`566`	NEAT's GEODSS Haleakala telescope in Hawaii, 1 in MPEC 2009-X47 -- P/1997 A2
`644`	NEAT's Mt. Palomar telescope in southern California, 2 in MPECs 2009-X40 & 2009-X47 -- 2009 TG8, P/2002 Q15
`608`	NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2009-X47 -- P/2002 Q15
`J47`	Nazaret Obs. in Spain, 1 in MPEC 2009-X40 -- 2009 XW1
`C494`	HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 12 in MPEC 2009-X45 -- C/2009 E4, C/2009 E2, C/2009 D7, C/2009 D5, C/2009 D4, C/2009 D3, C/2009 D2, C/2009 C4, C/2009 C3, C/2009 B9, C/2009 B8, C/2009 B11
`C495`	COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 1 in MPEC 2009-X45 -- C/2009 C3
`C505`	COR2-B instrument (5) aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2009-X45 -- C/2009 C3
`434`	San Benedetto Po Obs. in Italy, 1 in MPEC 2009-X40 -- 2009 WZ104
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2009-X40 -- 2009 WM139
`645`	Sloan Digital Sky Survey (SDSS) in New Mexico, 3 in MPEC 2009-X40 -- 2009 WD106, 2009 QB36, 2009 EK1
`691`	Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2009-X40 -- 2009 WM139, 2008 AX28
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2009-X40 -- 2003 SM84
`926`	Tenagra II Obs. in Arizona, 5 in MPECs 2009-X40, 2009-X41, 2009-X42, 2009-X43 & 2009-X44 -- 2009 XZ1, 2009 XC2, 2009 XB2, 2009 XA2, 2009 WC26

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

Impact Risk Monitoring on 12 December '09

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL 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 is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few 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

2009 XF2	JPL Sentry	2358	2024-2077	14	4.1e-09	-5.37	-6.01	0	JPL: "Analysis based on 8 observations spanning .64972 days (2009-Dec-12.26504 to 2009-Dec-12.91476)." Diameter approximately 0.519 km. from mean, weighted H=19.1.

2009 XC2	JPL Sentry	1700	2021-2104	24	6.1e-09	-3.91	-4.53	0	JPL: "Analysis based on 19 observations spanning 1.0548 days (2009-Dec-11.442 to 2009-Dec-12.49682)." Diameter approximately 1.400 km. from mean, weighted H=17.0.

2009 XR1	NEODyS	1537	2026-2068	3	3.79e-08	-9.46	-9.55	0	NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2009/12/11.147 to 2009/12/11.374."

2009 XO	JPL Sentry	1537	2075-2105	5	2.3e-07	-4.40	-4.40	0	JPL: "Analysis based on 62 observations spanning 3.0197 days (2009-Dec-09.152 to 2009-Dec-12.17168)." Diameter approximately 0.330 km. from mean, weighted H=20.0.
2009 XO	NEODyS	1537	2034-2059	2	2.87e-10	-6.79	-6.80	0	NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/12.172."

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 12 December '09

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

0602 12/13	Grabbed MPEC 2009-X47 - Comet P/2009 U6 = 1997 A2 = 2002 Q15 (LINEAR) - see above
2358	Noted that JPL Sentry has posted 2009 XF2 as an impact risk - see above
2301	Grabbed MPEC 2009-X46 - 2009 XF2 - see above
1806	Grabbed MPEC 2009-X45 - Twelve Sungrazing Comets - see above
1700	Noted that JPL Sentry has posted 2009 XC2 as an impact risk - see above
1537	Noted that JPL Sentry has updated its 2009 XO risk assessment - see above Noted that NEODyS has updated its 2009 XO risk assessment - see above Noted that NEODyS has posted 2009 XR1 as an impact risk - see above Grabbed MPEC 2009-X40 - Daily Orbit Update - see above Grabbed MPEC 2009-X41 - 2009 XZ1 - see above Grabbed MPEC 2009-X42 - 2009 XA2 - see above Grabbed MPEC 2009-X43 - 2009 XB2 - see above Grabbed MPEC 2009-X44 - 2009 XC2 - see above

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