A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During December 2009

Compiled at 2359 UTC on 31 December 2009

<< November 2009 CRT | CRT Archive Index | January 2010 CRT >>

[ Today's risk monitoring & other observing news | object risks cleared in December | Ephemerides for Active Risk-Rated Objects ]

Missing something? Check the archives for objects not under active observation or recent analysis.

Notes: The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both risk monitors also post a few special objects with impact solutions beyond 100 years. For the latest official risk assessments, and for explanations of terminology and methodology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
0000NNN000 Object	Risk Monitor	A/CC Noted Time & Day UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Latest Risk Assessments

2009 YR	NEODyS	1536 Dec. 26	2064-2088	7	4.09e-06	-7.16	-7.38	0	Based on 29 optical observations (of which 0 are rejected as outliers) from 2009/12/19.275 to 2009/12/25.819.
	JPL Sentry	1536 Dec. 26	2060-2087	6	9.5e-06	-6.75	-7.08	0	Analysis based on 29 observations spanning 6.5440 days (2009-Dec-19.27429 to 2009-Dec-25.81832). Diameter approximately 0.009 km. from mean, weighted H=28.0.
	Assessment postings were noted by A/CC on 20 Dec., 23 Dec. & 26 Dec. - References: MPECs 2009-Y30, 2009-Y32, 2009-Y45 & 2009-Y51

2009 YG	NEODyS	1600 Dec. 31	2033-2088	5	5.88e-07	-2.81	-3.26	0	Based on 49 optical observations (of which 0 are rejected as outliers) from 2009/12/17.421 to 2009/12/29.508.
	JPL Sentry	1600 Dec. 31	2033-2099	6	1.1e-06	-2.63	-2.97	0	Analysis based on 49 observations spanning 12.087 days (2009-Dec-17.42051 to 2009-Dec-29.507266). Diameter approximately 0.760 km. from mean, weighted H=18.3.
	Assessment postings were noted by A/CC on 18 Dec., 19 Dec., 20 Dec., 21 Dec., 26 Dec., 27 Dec., 28 Dec. & 31 Dec. - References: MPECs 2009-Y24, 2009-Y25, 2009-Y32, 2009-Y34, 2009-Y51, 2009-Y53, 2009-Y54 & 2009-Y64

2009 XR1	NEODyS	1537 Dec. 12	2026-2068	3	3.79e-08	-9.46	-9.55	0	Based on 15 optical observations (of which 0 are rejected as outliers) from 2009/12/11.147 to 2009/12/11.374.
	JPL Sentry	2120 Dec. 11	2026-2056	6	1.2e-07	-8.88	-9.50	0	Analysis based on 15 observations spanning .22732 days (2009-Dec-11.14638 to 2009-Dec-11.3737). Diameter approximately 0.005 km. from mean, weighted H=29.3.
	Assessment postings were noted by A/CC on 11 Dec. & 12 Dec. - References: MPEC 2009-X36

2009 XO	NEODyS	1600 Dec. 31	2038-2045	2	2.85e-07	-4.05	-4.33	0	Based on 122 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/29.402.
	JPL Sentry	1600 Dec. 31	2038-2094	3	3.2e-07	-4.03	-4.32	0	Analysis based on 122 observations spanning 20.249 days (2009-Dec-09.152 to 2009-Dec-29.40079). Diameter approximately 0.300 km. from mean, weighted H=20.2.
	Assessment postings were noted by A/CC on 10 Dec., 11 Dec., 12 Dec., 13 Dec., 15 Dec., 16 Dec., 17 Dec., 18 Dec., 19 Dec., 20 Dec., 21 Dec., 25 Dec., 26 Dec., 27 Dec., 28 Dec., 30 Dec. & 31 Dec. - References: MPECs 2009-X31, 2009-X32, 2009-X34, 2009-X40, 2009-X48, 2009-X56, 2009-Y02, 2009-Y19, 2009-Y22, 2009-Y25, 2009-Y32, 2009-Y34, 2009-Y49, 2009-Y51, 2009-Y53, 2009-Y54, 2009-Y61 & 2009-Y64

2009 WM1	NEODyS	1552 Dec. 23	2078-2079	5	1.28e-07	-4.76	-5.10	0	Based on 82 optical observations (of which 0 are rejected as outliers) from 2009/11/17.465 to 2009/12/22.626.
	JPL Sentry	1552 Dec. 23	2079	1	3.4e-08	-5.35	-5.35	0	Analysis based on 82 observations spanning 35.161 days (2009-Nov-17.4641 to 2009-Dec-22.625). Diameter approximately 0.280 km. from mean, weighted H=20.4.
	Assessment postings were noted by A/CC on 9 Dec. & 23 Dec. - References: MPECs 2009-X29 & 2009-Y45

2005 TM173	NEODyS	1824 Dec. 16	2010-2087	122	4.21e-07	-5.82	-6.57	0	Based on 6 optical observations (of which 0 are rejected as outliers) from 2005/10/09.201 to 2005/10/11.148.
	JPL Sentry	0604 Dec. 11	2010-2106	167	9.8e-07	-5.44	-6.37	0	Analysis based on 6 observations spanning 1.9467 days (2005-Oct-09.20072 to 2005-Oct-11.14743). Diameter approximately 0.051 km. from mean, weighted H=24.1.
	Assessment postings were noted by A/CC on 11 Dec. & 16 Dec. - References: no recent MPECs
C L E A R E D
2009 YV6	NEODyS	1509 Dec. 25	R E M O V E D
	JPL Sentry	1509 Dec. 25	R E M O V E D						Risk listing removed at 0949 UTC 25 Dec.
	Assessment postings were noted by A/CC on 21 Dec., 22 Dec. & 25 Dec. - References: MPECs 2009-Y38 & 2009-Y49

2009 YQ	NEODyS	1514 Dec. 21	R E M O V E D
	JPL Sentry	1514 Dec. 21	R E M O V E D						Risk listing removed at 1052 UTC 21 Dec.
	Assessment postings were noted by A/CC on 19 Dec., 20 Dec. & 21 Dec. - References: MPECs 2009-Y29, 2009-Y34, 2009-Y51, 2009-Y53 & 2009-Y54

2009 XJ8	JPL Sentry	1619 Dec. 17	R E M O V E D						Risk listing removed at 0949 UTC 17 Dec.
2009 XJ8	Assessment postings were noted by A/CC on 16 Dec. & 17 Dec. - References: MPECs 2009-Y07, 2009-Y19 & 2009-Y49

2009 XG8	NEODyS	1449 Dec. 18	R E M O V E D
	JPL Sentry	1449 Dec. 18	R E M O V E D						Risk listing removed at 0950 UTC 18 Dec.
	Assessment postings were noted by A/CC on 16 Dec., 17 Dec. & 18 Dec. - References: MPECs 2009-Y05, 2009-Y19, 2009-Y22 & 2009-Y25

2009 XT6	JPL Sentry	1552 Dec. 23	R E M O V E D						Risk listing removed at 1053 UTC 23 Dec.
	NEODyS	1558 Dec. 22	R E M O V E D
	Assessment postings were noted by A/CC on 15 Dec., 16 Dec., 17 Dec., 18 Dec., 19 Dec., 20 Dec., 21 Dec., 22 Dec. & 23 Dec. - References: MPECs 2009-X55, 2009-Y02, 2009-Y19, 2009-Y22, 2009-Y25, 2009-Y32, 2009-Y34, 2009-Y41, 2009-Y45, 2009-Y51, 2009-Y53, 2009-Y54 & 2009-Y61

2009 XQ2	JPL Sentry	1552 Dec. 14	R E M O V E D						Risk listing removed at 1059 UTC 14 Dec.
2009 XQ2	Assessment postings were noted by A/CC on 13 Dec. & 14 Dec. - References: MPECs 2009-X51 & 2009-X53

2009 XF2	NEODyS	1606 Dec. 15	R E M O V E D
	JPL Sentry	1606 Dec. 15	R E M O V E D						Risk listing removed at 1049 UTC 15 Dec.
	Assessment postings were noted by A/CC on 12 Dec., 13 Dec. & 15 Dec. - References: MPECs 2009-X46, 2009-X48, 2009-X56, 2009-Y02, 2009-Y22, 2009-Y34, 2009-Y51 & 2009-Y53

2009 XC2	JPL Sentry	1619 Dec. 17	R E M O V E D						Risk listing removed at 0949 UTC 17 Dec.
	NEODyS	1619 Dec. 17	R E M O V E D
	Assessment postings were noted by A/CC on 12 Dec., 13 Dec. & 17 Dec. - References: MPECs 2009-X44, 2009-X48, 2009-Y19, 2009-Y22, 2009-Y25, 2009-Y32, 2009-Y53, 2009-Y55 & 2009-Y61

2009 WO106	NEODyS	1650 Dec. 20	R E M O V E D
	JPL Sentry	1650 Dec. 20	R E M O V E D						Risk listing removed at 1151 UTC 20 Dec.
	Assessment postings were noted by A/CC on 20 Dec. - References: MPEC 2009-Y32

2009 WF106	JPL Sentry	1544 Dec. 1	R E M O V E D						Risk listing removed at 0952 UTC 1 Dec.
2009 WF106	An assessment posting was noted by A/CC on 1 Dec. - References: MPECs 2009-X02, 2009-X04 & 2009-X14

2009 WX51	JPL Sentry	1612 Dec. 2	R E M O V E D						Risk listing removed at 0949 UTC 2 Dec.
	NEODyS	1612 Dec. 2	R E M O V E D
	Assessment postings were noted by A/CC on 2 Dec. - References: MPECs 2009-X03, 2009-X14, 2009-X16, 2009-X32, 2009-X34, 2009-X40, 2009-X48, 2009-Y19, 2009-Y25 & 2009-Y34

2008 AF4	JPL Sentry	1638 Dec. 19	R E M O V E D						Risk listing removed at 1107 UTC 19 Dec.
2008 AF4	Assessment postings were noted by A/CC on 1 Dec., 2 Dec., 10 Dec. & 19 Dec. - References: MPECs 2009-X02, 2009-X03, 2009-X32 & 2009-Y25

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

For a list of risk-rated objects currently under observation, see our ephemerides page.

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" for more information.

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