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 YH30	JPL Sentry	1742 Dec. 31	2090-2102	5	3.3e-09	-9.56	-9.95	0	Analysis 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 YF30	JPL Sentry	1935 Dec. 31	2019-2108	66	9.1e-08	-6.76	-7.76	0	Analysis 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 YF29	NEODyS	1420 Dec. 31	2013-2090	36	2.92e-06	-4.66	-5.23	0	Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/12/30.250 to 2008/12/31.142.
	JPL Sentry	1420 Dec. 31	2013-2106	27	1.0e-06	-5.32	-5.57	0	Analysis 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 YE29	NEODyS	1420 Dec. 31	2069-2081	2	1.44e-09	-6.85	-6.88	0	Based on 33 optical observations (of which 0 are rejected as outliers) from 2008/12/30.226 to 2008/12/31.133.
	JPL Sentry	1420 Dec. 31	2033-2106	8	1.5e-08	-5.64	-6.20	0	Analysis 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 YB29	JPL Sentry	2210 Dec. 30	2021-2101	9	1.0e-06	-6.55	-6.86	0	Analysis 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 YA29	NEODyS	1420 Dec. 31	2027-2079	10	6.72e-09	-8.05	-8.59	0	Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/12/30.291 to 2008/12/30.412.
	JPL Sentry	2210 Dec. 30	2027-2106	19	1.8e-08	-7.63	-8.43	0	Analysis 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 YD3	NEODyS	1459 Dec. 23	2022	1	4.9e-10	-9.27	-9.27	0	Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/22.343 to 2008/12/22.486.
	JPL Sentry	2258 Dec. 22	2012-2104	21	4.3e-08	-7.82	-8.25	0	Analysis 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 YC3	NEODyS	1420 Dec. 31	2081-2090	11	6.1e-05	-4.83	-5.26	0	Based on 30 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2008/12/30.915.
	JPL Sentry	1420 Dec. 31	2070-2108	27	2.0e-04	-4.34	-4.90	0	Analysis 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 YO2	NEODyS	1459 Dec. 23	2052-2089	11	2.2e-06	-5.75	-5.91	0	Based on 25 optical observations (of which 0 are rejected as outliers) from 2008/12/21.166 to 2008/12/22.168.
	JPL Sentry	1934 Dec. 22	2052-2107	46	6.6e-06	-5.32	-5.88	0	Analysis 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 XU2	JPL Sentry	1420 Dec. 31	2039	1	5.1e-07	-6.41	-6.41	0	Analysis 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.
	NEODyS	1420 Dec. 31	R 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 XC1	NEODyS	2305 Dec. 13	2085	1	1.22e-07	-6.46	-6.46	0	Based on 139 optical observations (of which 1 are rejected as outliers) from 2008/12/03.369 to 2008/12/11.334.
	JPL Sentry	1456 Dec. 13	2085-2088	2	1.3e-07	-6.44	-6.50	0	Analysis 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 XK	NEODyS	1601 Dec. 3	2034-2085	18	6.25e-08	-8.33	-8.80	0	Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/02.281 to 2008/12/02.368.
	JPL Sentry	2312 Dec. 2	2013-2107	174	8.7e-07	-6.81	-7.71	0	Analysis 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 XB	NEODyS	1828 Dec. 4	2021-2064	2	1.82e-08	-6.54	-6.54	0	Based 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 YJ3	NEODyS	1536 Dec. 27	R E M O V E D
	JPL Sentry	1536 Dec. 27	R E M O V E D						Risk 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 YN2	JPL Sentry	1536 Dec. 27	R E M O V E D						Risk 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 XQ2	NEODyS	1430 Dec. 17	R E M O V E D
	JPL Sentry	1430 Dec. 17	R E M O V E D						Risk 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 XP2	JPL Sentry	1552 Dec. 7	R E M O V E D						Risk 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 XO2	JPL Sentry	1415 Dec. 24	R E M O V E D						Risk listing removed at 0949 UTC 24 Dec.
	NEODyS	1415 Dec. 24	R 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 XB2	JPL Sentry	1557 Dec. 6	R E M O V E D						Risk 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 XM1	NEODyS	1552 Dec. 7	R E M O V E D
	JPL Sentry	1552 Dec. 7	R E M O V E D						Risk 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 XO	NEODyS	1357 Dec. 5	R E M O V E D
	JPL Sentry	1357 Dec. 5	R E M O V E D						Risk 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 XN	NEODyS	1557 Dec. 6	R E M O V E D
	JPL Sentry	1557 Dec. 6	R E M O V E D						Risk 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 WK96	JPL Sentry	1415 Dec. 24	R E M O V E D						Risk listing removed at 0953 UTC 24 Dec.
	NEODyS	1415 Dec. 24	R 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 WJ96	JPL Sentry	1503 Dec. 3	R E M O V E D						Risk listing removed at 0952 UTC 3 Dec.
	NEODyS	1503 Dec. 3	R 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 WH96	JPL Sentry	1503 Dec. 3	R E M O V E D						Risk listing removed at 0953 UTC 3 Dec.
	NEODyS	1503 Dec. 3	R 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 WY94	JPL Sentry	1529 Dec. 30	R E M O V E D						Risk listing removed at 0951 UTC 30 Dec.
	NEODyS	1529 Dec. 30	R 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 WM64	JPL Sentry	1349 Dec. 1	R E M O V E D						Risk listing removed at 1032 UTC 1 Dec.
	NEODyS	1349 Dec. 1	R 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 WZ13	NEODyS	1801 Dec. 7	R E M O V E D
	JPL Sentry	1552 Dec. 7	R E M O V E D						Risk 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 WY13	JPL Sentry	1332 Dec. 2	R E M O V E D						Risk 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 VL14	JPL Sentry	1349 Dec. 1	R E M O V E D						Risk listing removed at 0955 UTC 1 Dec.
	NEODyS	1349 Dec. 1	R E M O V E D
	Assessment postings were noted by A/CC on 1 Dec. - References: MPECs 2008-X09 & 2008-X17

2008 VV4 aka 2001 XQ	JPL Sentry	2206 Dec. 1	R E M O V E D						Risk listing removed at 1831 UTC 12 Nov.
	An assessment posting was noted by A/CC on 1 Dec. - Reference: MPEC 2008-X09

2008 UW99	JPL Sentry	1348 Dec. 8	R E M O V E D						Risk 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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