A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During December 2008

Compiled at 0028 UTC on 1 January 2009

<< November 2008 CRT | CRT Archive Index | January 2009 CRT >>

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

Missing something? Here is 99942 Apophis (2004 MN4) and 144898 2004 VD17. Check the archives for others.

Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
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
2008 YH30JPL Sentry1742 Dec. 312090-210253.3e-09-9.56-9.950Analysis based on 13 observations spanning .17167 days (2008-Dec-31.29293 to 2008-Dec-31.4646). Diameter approximately 0.014 km. from mean, weighted H=26.8.
An assessment posting was noted by A/CC on 31 Dec.   -   References: MPEC 2008-Y84
2008 YF30JPL Sentry1935 Dec. 312019-2108669.1e-08-6.76-7.760Analysis based on 12 observations spanning .10763 days (2008-Dec-31.21642 to 2008-Dec-31.32405). Diameter approximately 0.040 km. from mean, weighted H=24.6.
An assessment posting was noted by A/CC on 31 Dec.   -   References: MPEC 2008-Y82
2008 YF29NEODyS1420 Dec. 312013-2090362.92e-06-4.66-5.230Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/12/30.250 to 2008/12/31.142.
JPL Sentry1420 Dec. 312013-2106271.0e-06-5.32-5.570Analysis based on 23 observations spanning .89215 days (2008-Dec-30.24924 to 2008-Dec-31.14139). Diameter approximately 0.053 km. from mean, weighted H=24.0.
Assessment postings were noted by A/CC on 30 Dec. & 31 Dec.   -   References: MPECs 2008-Y76 & 2008-Y80
2008 YE29NEODyS1420 Dec. 312069-208121.44e-09-6.85-6.880Based on 33 optical observations (of which 0 are rejected as outliers) from 2008/12/30.226 to 2008/12/31.133.
JPL Sentry1420 Dec. 312033-210681.5e-08-5.64-6.200Analysis based on 33 observations spanning .90643 days (2008-Dec-30.22562 to 2008-Dec-31.13205). Diameter approximately 0.320 km. from mean, weighted H=20.1.
Assessment postings were noted by A/CC on 30 Dec. & 31 Dec.   -   References: MPECs 2008-Y75 & 2008-Y80
2008 YB29JPL Sentry2210 Dec. 302021-210191.0e-06-6.55-6.860Analysis based on 19 observations spanning .16832 days (2008-Dec-30.38794 to 2008-Dec-30.55626). Diameter approximately 0.025 km. from mean, weighted H=25.7.
An assessment posting was noted by A/CC on 30 Dec.   -   References: MPEC 2008-Y72
2008 YA29NEODyS1420 Dec. 312027-2079106.72e-09-8.05-8.590Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/12/30.291 to 2008/12/30.412.
JPL Sentry2210 Dec. 302027-2106191.8e-08-7.63-8.430Analysis based on 16 observations spanning .12116 days (2008-Dec-30.29053 to 2008-Dec-30.41169). Diameter approximately 0.040 km. from mean, weighted H=24.7.
Assessment postings were noted by A/CC on 30 Dec. & 31 Dec.   -   References: MPEC 2008-Y71
2008 YD3NEODyS1459 Dec. 23202214.9e-10-9.27-9.270Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/22.343 to 2008/12/22.486.
JPL Sentry2258 Dec. 222012-2104214.3e-08-7.82-8.250Analysis based on 12 observations spanning .14315 days (2008-Dec-22.34245 to 2008-Dec-22.4856). Diameter approximately 0.020 km. from mean, weighted H=26.2.
Assessment postings were noted by A/CC on 22 Dec. & 23 Dec.   -   References: MPEC 2008-Y40
2008 YC3NEODyS1420 Dec. 312081-2090116.1e-05-4.83-5.260Based on 30 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2008/12/30.915.
JPL Sentry1420 Dec. 312070-2108272.0e-04-4.34-4.900Analysis based on 26 observations spanning 8.6619 days (2008-Dec-22.25277 to 2008-Dec-30.91466). Diameter approximately 0.027 km. from mean, weighted H=25.5.
Assessment postings were noted by A/CC on 22 Dec., 23 Dec., 27 Dec., 29 Dec., 30 Dec. & 31 Dec.   -   References: MPECs 2008-Y39, 2008-Y56, 2008-Y61, 2008-Y66 & 2008-Y80
2008 YO2NEODyS1459 Dec. 232052-2089112.2e-06-5.75-5.910Based on 25 optical observations (of which 0 are rejected as outliers) from 2008/12/21.166 to 2008/12/22.168.
JPL Sentry1934 Dec. 222052-2107466.6e-06-5.32-5.880Analysis based on 25 observations spanning 1.0020 days (2008-Dec-21.16512 to 2008-Dec-22.16708). Diameter approximately 0.031 km. from mean, weighted H=25.2.
Assessment postings were noted by A/CC on 22 Dec. & 23 Dec.   -   References: MPEC 2008-Y34
2008 XU2JPL Sentry1420 Dec. 31203915.1e-07-6.41-6.410Analysis based on 37 observations spanning 24.008 days (2008-Dec-06.2616 to 2008-Dec-30.26977). Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS1420 Dec. 31R E M O V E D
Assessment postings were noted by A/CC on 7 Dec., 8 Dec., 10 Dec., 24 Dec., 30 Dec. & 31 Dec.   -   References: MPECs 2008-X55, 2008-X71, 2008-Y50, 2008-Y66 & 2008-Y80
2008 XC1NEODyS2305 Dec. 13208511.22e-07-6.46-6.460Based on 139 optical observations (of which 1 are rejected as outliers) from 2008/12/03.369 to 2008/12/11.334.
JPL Sentry1456 Dec. 132085-208821.3e-07-6.44-6.500Analysis based on 138 observations spanning 7.9652 days (2008-Dec-03.36799 to 2008-Dec-11.3332). Diameter approximately 0.063 km. from mean, weighted H=23.7.
Assessment postings were noted by A/CC on 4 Dec., 5 Dec., 6 Dec., 7 Dec., 8 Dec., 9 Dec., 10 Dec., 11 Dec., 12 Dec. & 13 Dec.   -   References: MPECs 2008-X34, 2008-X35, 2008-X40, 2008-X49, 2008-X54, 2008-X64, 2008-X70, 2008-X71, 2008-X72, 2008-X79 & 2008-X82
2008 XKNEODyS1601 Dec. 32034-2085186.25e-08-8.33-8.800Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/02.281 to 2008/12/02.368.
JPL Sentry2312 Dec. 22013-21071748.7e-07-6.81-7.710Analysis based on 12 observations spanning .08663 days (2008-Dec-02.28019 to 2008-Dec-02.36682). Diameter approximately 0.012 km. from mean, weighted H=27.2.
Assessment postings were noted by A/CC on 2 Dec. & 3 Dec.   -   References: MPEC 2008-X23
2008 XBNEODyS1828 Dec. 42021-206421.82e-08-6.54-6.540Based on 11 optical observations (of which 0 are rejected as outliers) from 2008/12/01.135 to 2008/12/01.210.
An assessment posting was noted by A/CC on 4 Dec.   -   References: MPEC 2008-X16
C   L   E   A   R   E   D
2008 YJ3NEODyS1536 Dec. 27R E M O V E D
JPL Sentry1536 Dec. 27R E M O V E DRisk listing removed at 0951 UTC 27 Dec.
Assessment postings were noted by A/CC on 23 Dec., 24 Dec. & 27 Dec.   -   References: MPECs 2008-Y48, 2008-Y56, 2008-Y66 & 2008-Y80
2008 YN2JPL Sentry1536 Dec. 27R E M O V E DRisk listing removed at 0955 UTC 27 Dec.
Assessment postings were noted by A/CC on 22 Dec. & 27 Dec.   -   References: MPECs 2008-Y33, 2008-Y56, 2008-Y66 & 2008-Y80
2008 XQ2NEODyS1430 Dec. 17R E M O V E D
JPL Sentry1430 Dec. 17R E M O V E DRisk listing removed at 0950 UTC 17 Dec.
Assessment postings were noted by A/CC on 7 Dec. & 17 Dec.   -   References: MPECs 2008-X52, 2008-X54, 2008-Y02 & 2008-Y66
2008 XP2JPL Sentry1552 Dec. 7R E M O V E DRisk listing removed at 1039 UTC 7 Dec.
Assessment postings were noted by A/CC on 6 Dec. & 7 Dec.   -   References: MPECs 2008-X51, 2008-X54, 2008-X64, 2008-X82, 2008-Y02, 2008-Y50, 2008-Y56 & 2008-Y61
2008 XO2JPL Sentry1415 Dec. 24R E M O V E DRisk listing removed at 0949 UTC 24 Dec.
NEODyS1415 Dec. 24R E M O V E D
Assessment postings were noted by A/CC on 6 Dec., 7 Dec., 8 Dec. & 24 Dec.   -   References: MPECs 2008-X50, 2008-X54, 2008-X64, 2008-Y50 & 2008-Y66
2008 XB2JPL Sentry1557 Dec. 6R E M O V E DRisk listing removed at 0956 UTC 6 Dec.
Assessment postings were noted by A/CC on 5 Dec. & 6 Dec.   -   References: MPECs 2008-X44, 2008-X49, 2008-X54, 2008-X70, 2008-X71, 2008-X82, 2008-X87 & 2008-Y02
2008 XM1NEODyS1552 Dec. 7R E M O V E D
JPL Sentry1552 Dec. 7R E M O V E DRisk listing removed at 1033 UTC 7 Dec.
Assessment postings were noted by A/CC on 4 Dec., 5 Dec., 6 Dec. & 7 Dec.   -   References: MPECs 2008-X38, 2008-X40, 2008-X49, 2008-X54, 2008-X64, 2008-X70, 2008-X71, 2008-X79, 2008-X82 & 2008-X87
2008 XONEODyS1357 Dec. 5R E M O V E D
JPL Sentry1357 Dec. 5R E M O V E DRisk listing removed at 1130 UTC 5 Dec.
Assessment postings were noted by A/CC on 3 Dec., 4 Dec. & 5 Dec.   -   References: MPECs 2008-X30, 2008-X40, 2008-X54 & 2008-X82
2008 XNNEODyS1557 Dec. 6R E M O V E D
JPL Sentry1557 Dec. 6R E M O V E DRisk listing removed at 1030 UTC 6 Dec.
Assessment postings were noted by A/CC on 3 Dec., 4 Dec., 5 Dec. & 6 Dec.   -   References: MPECs 2008-X29, 2008-X40, 2008-X49, 2008-X54, 2008-X70, 2008-Y08, 2008-Y50, 2008-Y56 & 2008-Y66
2008 WK96JPL Sentry1415 Dec. 24R E M O V E DRisk listing removed at 0953 UTC 24 Dec.
NEODyS1415 Dec. 24R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 2 Dec., 5 Dec., 6 Dec., 7 Dec., 8 Dec., 13 Dec., 17 Dec. & 24 Dec.   -   References: MPECs 2008-X15, 2008-X17, 2008-X40, 2008-X49, 2008-X54, 2008-X64, 2008-X82, 2008-Y02, 2008-Y50 & 2008-Y80
2008 WJ96JPL Sentry1503 Dec. 3R E M O V E DRisk listing removed at 0952 UTC 3 Dec.
NEODyS1503 Dec. 3R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 2 Dec. & 3 Dec.   -   References: MPECs 2008-X14, 2008-X27, 2008-X49, 2008-X54 & 2008-Y50
2008 WH96JPL Sentry1503 Dec. 3R E M O V E DRisk listing removed at 0953 UTC 3 Dec.
NEODyS1503 Dec. 3R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 2 Dec. & 3 Dec.   -   References: MPECs 2008-X13, 2008-X27 & 2008-X54
2008 WY94JPL Sentry1529 Dec. 30R E M O V E DRisk listing removed at 0951 UTC 30 Dec.
NEODyS1529 Dec. 30R E M O V E D
Assessment postings were noted by A/CC on 1 Dec., 2 Dec., 3 Dec., 4 Dec., 7 Dec., 9 Dec., 11 Dec. & 30 Dec.   -   References: MPECs 2008-X05, 2008-X17, 2008-X27, 2008-X35, 2008-X54, 2008-X70, 2008-X72 & 2008-Y66
2008 WM64JPL Sentry1349 Dec. 1R E M O V E DRisk listing removed at 1032 UTC 1 Dec.
NEODyS1349 Dec. 1R E M O V E D
Assessment postings were noted by A/CC on 1 Dec.   -   References: MPECs 2008-X09, 2008-X17, 2008-X27, 2008-Y50 & 2008-Y66
2008 WZ13NEODyS1801 Dec. 7R E M O V E D
JPL Sentry1552 Dec. 7R E M O V E DRisk listing removed at 0951 UTC 7 Dec.
Assessment postings were noted by A/CC on 1 Dec., 2 Dec., 3 Dec., 5 Dec., 6 Dec. & 7 Dec.   -   References: MPECs 2008-X09, 2008-X17, 2008-X27, 2008-X40, 2008-X49, 2008-X54, 2008-Y50 & 2008-Y66
2008 WY13JPL Sentry1332 Dec. 2R E M O V E DRisk listing removed at 0951 UTC 2 Dec.
Assessment postings were noted by A/CC on 1 Dec. & 2 Dec.   -   References: MPECs 2008-X09, 2008-X17 & 2008-X27
2008 VL14JPL Sentry1349 Dec. 1R E M O V E DRisk listing removed at 0955 UTC 1 Dec.
NEODyS1349 Dec. 1R E M O V E D
Assessment postings were noted by A/CC on 1 Dec.   -   References: MPECs 2008-X09 & 2008-X17
2008 VV4 ID = 2001 XQJPL Sentry2206 Dec. 1R E M O V E DRisk listing removed at 1831 UTC 12 Nov.
An assessment posting was noted by A/CC on 1 Dec.   -   Reference: MPEC 2008-X09
2008 UW99JPL Sentry1348 Dec. 8R E M O V E DRisk listing removed at 0950 UTC 8 Dec.
Assessment postings were noted by A/CC on 2 Dec. & 8 Dec.   -   References: MPECs 2008-X17 & 2008-X64

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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