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 YRNEODyS1536 Dec. 262064-208874.09e-06-7.16-7.380Based on 29 optical observations (of which 0 are rejected as outliers) from 2009/12/19.275 to 2009/12/25.819.
JPL Sentry1536 Dec. 262060-208769.5e-06-6.75-7.080Analysis 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 YGNEODyS1600 Dec. 312033-208855.88e-07-2.81-3.260Based on 49 optical observations (of which 0 are rejected as outliers) from 2009/12/17.421 to 2009/12/29.508.
JPL Sentry1600 Dec. 312033-209961.1e-06-2.63-2.970Analysis 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 XR1NEODyS1537 Dec. 122026-206833.79e-08-9.46-9.550Based on 15 optical observations (of which 0 are rejected as outliers) from 2009/12/11.147 to 2009/12/11.374.
JPL Sentry2120 Dec. 112026-205661.2e-07-8.88-9.500Analysis 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 XONEODyS1600 Dec. 312038-204522.85e-07-4.05-4.330Based on 122 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/29.402.
JPL Sentry1600 Dec. 312038-209433.2e-07-4.03-4.320Analysis 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 WM1NEODyS1552 Dec. 232078-207951.28e-07-4.76-5.100Based on 82 optical observations (of which 0 are rejected as outliers) from 2009/11/17.465 to 2009/12/22.626.
JPL Sentry1552 Dec. 23207913.4e-08-5.35-5.350Analysis 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 TM173NEODyS1824 Dec. 162010-20871224.21e-07-5.82-6.570Based on 6 optical observations (of which 0 are rejected as outliers) from 2005/10/09.201 to 2005/10/11.148.
JPL Sentry0604 Dec. 112010-21061679.8e-07-5.44-6.370Analysis 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 YV6NEODyS1509 Dec. 25R E M O V E D
JPL Sentry1509 Dec. 25R E M O V E DRisk 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 YQNEODyS1514 Dec. 21R E M O V E D
JPL Sentry1514 Dec. 21R E M O V E DRisk 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 XJ8JPL Sentry1619 Dec. 17R E M O V E DRisk listing removed at 0949 UTC 17 Dec.
Assessment postings were noted by A/CC on 16 Dec. & 17 Dec.   -   References: MPECs 2009-Y07, 2009-Y19 & 2009-Y49
2009 XG8NEODyS1449 Dec. 18R E M O V E D
JPL Sentry1449 Dec. 18R E M O V E DRisk 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 XT6JPL Sentry1552 Dec. 23R E M O V E DRisk listing removed at 1053 UTC 23 Dec.
NEODyS1558 Dec. 22R 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 XQ2JPL Sentry1552 Dec. 14R E M O V E DRisk listing removed at 1059 UTC 14 Dec.
Assessment postings were noted by A/CC on 13 Dec. & 14 Dec.   -   References: MPECs 2009-X51 & 2009-X53
2009 XF2NEODyS1606 Dec. 15R E M O V E D
JPL Sentry1606 Dec. 15R E M O V E DRisk 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 XC2JPL Sentry1619 Dec. 17R E M O V E DRisk listing removed at 0949 UTC 17 Dec.
NEODyS1619 Dec. 17R 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 WO106NEODyS1650 Dec. 20R E M O V E D
JPL Sentry1650 Dec. 20R E M O V E DRisk listing removed at 1151 UTC 20 Dec.
Assessment postings were noted by A/CC on 20 Dec.   -   References: MPEC 2009-Y32
2009 WF106JPL Sentry1544 Dec. 1R E M O V E DRisk listing removed at 0952 UTC 1 Dec.
An assessment posting was noted by A/CC on 1 Dec.   -   References: MPECs 2009-X02, 2009-X04 & 2009-X14
2009 WX51JPL Sentry1612 Dec. 2R E M O V E DRisk listing removed at 0949 UTC 2 Dec.
NEODyS1612 Dec. 2R 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 AF4JPL Sentry1638 Dec. 19R E M O V E DRisk listing removed at 1107 UTC 19 Dec.
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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