A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During October 2011

Compiled at 2359 UTC on 31 October 2011

<< September 2011 CRT | CRT Archive Index | November 2011 CRT >>

[ Today's risk monitoring & other observing news | object risks cleared in October | 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 CLOMON2 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
2011 UZ255JPL Sentry1948 Oct. 312063-2107247.5e-06-4.48-4.910Analysis based on 21 observations spanning .98813 days (2011-Oct-30.44574 to 2011-Oct-31.43387). Diameter approximately 0.072 km. from mean, weighted H=23.4.
An assessment posting was noted by A/CC on 31 Oct.   -   References: MPEC 2011-U114
2011 UW255JPL Sentry1948 Oct. 312021-21113673.2e-06-4.80-5.890Analysis based on 22 observations spanning 1.0036 days (2011-Oct-30.16049 to 2011-Oct-31.164119). Diameter approximately 0.067 km. from mean, weighted H=23.5.
An assessment posting was noted by A/CC on 31 Oct.   -   References: MPEC 2011-U111
2011 UA193NEODyS1653 Oct. 312053-205329.79e-07-5.76-5.770Based on 28 optical observations (of which 0 are rejected as outliers) from 2011-10-28.252 to 2011-10-30.338.
JPL Sentry1653 Oct. 31205321.3e-06-5.62-5.640Analysis based on 28 observations spanning 2.0858 days (2011-Oct-28.25133 to 2011-Oct-30.33708). Diameter approximately 0.042 km. from mean, weighted H=24.5.
Assessment postings were noted by A/CC on 30 Oct. & 31 Oct.   -   References: MPEC 2011-U106 plus DOU 2011-U109
2011 UX192NEODyS1653 Oct. 312026-2082165.13e-10-4.32-5.150Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-10-24.555 to 2011-10-30.235.
JPL Sentry1653 Oct. 31R E M O V E DRisk listing removed at 0935 UTC 31 Oct.
Assessment postings were noted by A/CC on 30 Oct. & 31 Oct.   -   References: MPEC 2011-U104 plus DOU 2011-U109
2011 UM169NEODyS1653 Oct. 31R E M O V E D
JPL Sentry1653 Oct. 312090-2107235.5e-05-4.43-4.780Analysis based on 19 observations spanning 2.8627 days (2011-Oct-27.37573 to 2011-Oct-30.23838). Diameter approximately 0.035 km. from mean, weighted H=24.9.
Assessment postings were noted by A/CC on 28 Oct., 29 Oct., 30 Oct. & 31 Oct.   -   References: MPEC 2011-U95 plus DOUs 2011-U101 & 2011-U109
2011 UL169NEODyS1653 Oct. 312057-206771.25e-05-6.52-6.580Based on 23 optical observations (of which 0 are rejected as outliers) from 2011-10-27.293 to 2011-10-30.215.
JPL Sentry1653 Oct. 312057-207351.2e-05-6.54-6.560Analysis based on 23 observations spanning 2.9228 days (2011-Oct-27.2919 to 2011-Oct-30.21473). Diameter approximately 0.007 km. from mean, weighted H=28.3.
Assessment postings were noted by A/CC on 28 Oct., 29 Oct. & 31 Oct.   -   References: MPEC 2011-U94 plus DOU 2011-U109
2011 UG169NEODyS1618 Oct. 292018-2090133.82e-09-8.26-8.630Based on 9 optical observations (of which 0 are rejected as outliers) from 2011-10-24.431 to 2011-10-25.291.
JPL Sentry1544 Oct. 282013-21115122.0e-06-6.10-7.140Analysis based on 9 observations spanning .86057 days (2011-Oct-24.43013 to 2011-Oct-25.290705). Diameter approximately 0.020 km. from mean, weighted H=26.2.
Assessment postings were noted by A/CC on 28 Oct. & 29 Oct.   -   References: MPEC 2011-U92
2011 UW158JPL Sentry1834 Oct. 312015-21112242.4e-05-1.41-1.460Analysis based on 35 observations spanning 4.9861 days (2011-Oct-25.4186 to 2011-Oct-30.40472). Diameter approximately 0.446 km. from mean, weighted H=19.4.
NEODyS1653 Oct. 312015-2087218.42e-06-1.56-1.640Based on 35 optical observations (of which 2 are rejected as outliers) from 2011-10-25.419 to 2011-10-30.405.
Assessment postings were noted by A/CC on 28 Oct., 30 Oct. & 31 Oct.   -   References: MPEC 2011-U90 plus DOUs 2011-U101 & 2011-U109
2011 UV158NEODyS1541 Oct. 282017-2090513.8e-08-5.44-5.980Based on 10 optical observations (of which 0 are rejected as outliers) from 2011-10-24.547 to 2011-10-25.354.
JPL Sentry1622 Oct. 272020-2111576.7e-08-5.54-6.190Analysis based on 10 observations spanning .80746 days (2011-Oct-24.54593 to 2011-Oct-25.353385). Diameter approximately 0.130 km. from mean, weighted H=22.1.
Assessment postings were noted by A/CC on 27 Oct. & 28 Oct.   -   References: MPEC 2011-U89
2011 UC64JPL Sentry1322 Oct. 252093-2110157.4e-06-6.71-7.010Analysis based on 48 observations spanning 1.7613 days (2011-Oct-22.324 to 2011-Oct-24.085335). Diameter approximately 0.009 km. from mean, weighted H=27.9.
Assessment postings were noted by A/CC on 23 Oct. & 25 Oct.   -   References: MPEC 2011-U59 plus DOU 2011-U70
2011 UL21NEODyS1653 Oct. 312032-2068118.01e-08-2.22-2.570Based on 84 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-30.496.
JPL Sentry1653 Oct. 312035-2109172.5e-07-1.73-2.180Analysis based on 84 observations spanning 13.012 days (2011-Oct-17.48272 to 2011-Oct-30.49493). Diameter approximately 2.500 km. from mean, weighted H=15.7.
Assessment postings were noted by A/CC on 21 Oct., 22 Oct., 24 Oct., 25 Oct., 26 Oct., 27 Oct., 28 Oct., 29 Oct. & 31 Oct.   -   References: MPEC 2011-U39 plus DOUs 2011-U61, 2011-U70, 2011-U81, 2011-U87, 2011-U91, 2011-U97, 2011-U101 & 2011-U109
2011 UD21JPL Sentry1653 Oct. 31210512.4e-06-7.86-7.860Analysis based on 64 observations spanning 11.880 days (2011-Oct-18.42484 to 2011-Oct-30.30467). Diameter approximately 0.007 km. from mean, weighted H=28.6.
Assessment postings were noted by A/CC on 24 Oct., 27 Oct., 30 Oct. & 31 Oct.   -   References: MPEC 2011-U32 plus DOUs 2011-U61, 2011-U87, 2011-U101 & 2011-U109
2011 UTJPL Sentry1527 Oct. 302034-210984.8e-06-5.76-6.290Analysis based on 69 observations spanning 11.862 days (2011-Oct-17.41107 to 2011-Oct-29.27325). Diameter approximately 0.025 km. from mean, weighted H=25.7.
NEODyS1622 Oct. 272034-208531.25e-06-6.07-6.340Based on 64 optical observations (of which 0 are rejected as outliers) from 2011-10-17.412 to 2011-10-26.204.
Assessment postings were noted by A/CC on 18 Oct., 19 Oct., 20 Oct., 21 Oct., 22 Oct., 23 Oct., 24 Oct., 25 Oct., 27 Oct., 28 Oct. & 30 Oct.   -   References: MPEC 2011-U12 plus DOUs 2011-U23, 2011-U33, 2011-U43, 2011-U45, 2011-U61, 2011-U70, 2011-U87, 2011-U91 & 2011-U101
2011 TONEODyS0002 Oct. 82053-2089191.32e-05-5.62-5.780Based on 37 optical observations (of which 0 are rejected as outliers) from 2011-10-01.237 to 2011-10-05.115.
JPL Sentry0002 Oct. 82049-2088141.3e-05-5.62-5.770Analysis based on 37 observations spanning 3.8771 days (2011-Oct-01.23672 to 2011-Oct-05.11386). Diameter approximately 0.019 km. from mean, weighted H=26.3.
Assessment postings were noted by A/CC on 3 Oct. & 8 Oct.   -   References: MPEC 2011-T15 plus DOUs 2011-T22 & 2011-T33
2011 SE191NEODyS0002 Oct. 82079-207911.98e-11-10.81-10.810Based on 36 optical observations (of which 0 are rejected as outliers) from 2011-09-30.416 to 2011-10-03.263.
JPL Sentry0002 Oct. 8209811.6e-08-7.99-7.990Analysis based on 36 observations spanning 2.8476 days (2011-Sep-30.41481 to 2011-Oct-03.26239). Diameter approximately 0.032 km. from mean, weighted H=25.1.
Assessment postings were noted by A/CC on 1 Oct., 3 Oct. & 8 Oct.   -   References: MPEC 2011-T04 plus DOUs 2011-T18 & 2011-T22
2011 SO189NEODyS0002 Oct. 82056-2090141.1e-04-4.72-5.070Based on 31 optical observations (of which 0 are rejected as outliers) from 2011-09-29.424 to 2011-10-06.340.
JPL Sentry0002 Oct. 82056-2090141.1e-04-4.73-5.070Analysis based on 31 observations spanning 6.9160 days (2011-Sep-29.42352 to 2011-Oct-06.339478). Diameter approximately 0.017 km. from mean, weighted H=26.5.
Assessment postings were noted by A/CC on 1 Oct., 2 Oct., 3 Oct. & 8 Oct.   -   References: DOUs 2011-T06, 2011-T18, 2011-T27, 2011-T33 & 2011-T36
2011 SM173NEODyS0002 Oct. 82058-208973.64e-05-5.69-5.710Based on 32 optical observations (of which 3 are rejected as outliers) from 2011-09-29.226 to 2011-09-30.454.
JPL Sentry0002 Oct. 82058-208957.0e-05-5.42-5.450Analysis based on 31 observations spanning 1.2283 days (2011-Sep-29.22504 to 2011-Sep-30.453311). Diameter approximately 0.009 km. from mean, weighted H=27.8.
Assessment postings were noted by A/CC on 1 Oct. & 8 Oct.   -   References: DOUs 2011-T01 & 2011-T22
2011 QF48NEODyS1526 Oct. 212067-206723.04e-07-6.46-6.570Based on 47 optical observations (of which 0 are rejected as outliers) from 2011-08-30.702 to 2011-09-21.472.
JPL Sentry1526 Oct. 21206723.5e-07-6.40-6.510Analysis based on 47 observations spanning 21.769 days (2011-Aug-30.7015 to 2011-Sep-21.470845). Diameter approximately 0.030 km. from mean, weighted H=25.3.
Assessment postings were noted by A/CC on 18 Oct., 19 Oct. & 21 Oct.   -   References: DOUs 2011-U11 & 2011-U33
C   L   E   A   R   E   D
2011 UA131NEODyS1618 Oct. 29R E M O V E D
JPL Sentry1618 Oct. 29R E M O V E DRisk listing removed at 0849 UTC 29 Oct.
Assessment postings were noted by A/CC on 26 Oct. & 29 Oct.   -   References: MPEC 2011-U79 plus DOUs 2011-U97, 2011-U101 & 2011-U109
2011 US63JPL Sentry1617 Oct. 26R E M O V E DRisk listing removed at 0930 UTC 26 Oct.
Assessment postings were noted by A/CC on 23 Oct., 24 Oct. & 26 Oct.   -   References: MPEC 2011-U49 plus DOUs 2011-U61, 2011-U81, 2011-U87, 2011-U91, 2011-U101 & 2011-U109
2011 UR63JPL Sentry1617 Oct. 26R E M O V E DRisk listing removed at 0853 UTC 26 Oct.
Assessment postings were noted by A/CC on 23 Oct. & 26 Oct.   -   References: MPEC 2011-U48 plus DOU 2011-U81
2011 UH20JPL Sentry1622 Oct. 27R E M O V E DRisk listing removed at 0954 UTC 27 Oct.
NEODyS1617 Oct. 26R E M O V E D
Assessment postings were noted by A/CC on 20 Oct., 21 Oct., 22 Oct., 23 Oct., 24 Oct., 26 Oct. & 27 Oct.   -   References: MPEC 2011-U25 plus DOUs 2011-U33, 2011-U43, 2011-U45, 2011-U61, 2011-U81, 2011-U87, 2011-U91 & 2011-U109
2011 UG20JPL Sentry1617 Oct. 26R E M O V E DRisk listing removed at 0943 UTC 26 Oct.
Assessment postings were noted by A/CC on 24 Oct. & 26 Oct.   -   References: MPEC 2011-U24 plus DOUs 2011-U33, 2011-U61, 2011-U81 & 2011-U91
2011 TQ8JPL Sentry1602 Oct. 9R E M O V E DRisk listing removed at 0851 UTC 9 Oct.
Assessment postings were noted by A/CC on 8 Oct. & 9 Oct.   -   References: MPEC 2011-T37 plus DOUs 2011-T40, 2011-T45, 2011-U23, 2011-U33 & 2011-U109
2011 TKJPL Sentry1547 Oct. 17R E M O V E DRisk listing removed at 0850 UTC 17 Oct.
NEODyS1602 Oct. 9R E M O V E D
Assessment postings were noted by A/CC on 2 Oct., 3 Oct., 8 Oct., 9 Oct., 10 Oct., 12 Oct., 15 Oct., 16 Oct. & 17 Oct.   -   References: MPEC 2011-T11 plus DOUs 2011-T22, 2011-T27, 2011-T33, 2011-T36, 2011-T38, 2011-T40, 2011-T44, 2011-T46, 2011-T55, 2011-U01, 2011-U05, 2011-U43, 2011-U81 & 2011-U87
2011 TBJPL Sentry0002 Oct. 8R E M O V E DRisk listing removed at 0929 UTC 4 Oct.
Assessment postings were noted by A/CC on 1 Oct., 2 Oct. & 8 Oct.   -   References: MPEC 2011-T05 plus DOUs 2011-T06, 2011-T22, 2011-T33 & 2011-T36
2011 ST232JPL Sentry0002 Oct. 8R E M O V E DRisk listing removed at 0929 UTC 4 Oct.
Assessment postings were noted by A/CC on 2 Oct. & 8 Oct.   -   References: MPEC 2011-T07 plus DOUs 2011-T22, 2011-T27, 2011-T33, 2011-U45 & 2011-U109
2011 SD173NEODyS1618 Oct. 29R E M O V E D
JPL Sentry1544 Oct. 28R E M O V E DRisk listing removed at 0850 UTC 28 Oct.
Assessment postings were noted by A/CC on 1 Oct., 2 Oct., 3 Oct., 21 Oct., 22 Oct., 23 Oct., 24 Oct., 25 Oct., 28 Oct. & 29 Oct.   -   References: DOUs 2011-T01, 2011-T06, 2011-T18, 2011-U33, 2011-U43, 2011-U45, 2011-U61, 2011-U70, 2011-U91 & 2011-U97
2011 SY120JPL Sentry1608 Oct. 2R E M O V E DRisk listing removed at 0951 UTC 2 Oct.
An assessment posting was noted by A/CC on 2 Oct.   -   References: DOUs 2011-T06 & 2011-T18
2011 SE97JPL Sentry0533 Oct. 16R E M O V E DRisk listing removed at 0451 UTC 16 Oct.
Assessment postings were noted by A/CC on 1 Oct., 3 Oct., 8 Oct., 9 Oct. & 16 Oct.   -   References: DOUs 2011-T01, 2011-T18, 2011-T22, 2011-T27, 2011-T33, 2011-T40, 2011-T45 & 2011-T52, radar: 16 Oct.
2011 SV71NEODyS1543 Oct. 19R E M O V E D
JPL Sentry1543 Oct. 19R E M O V E DRisk listing removed at 0849 UTC 19 Oct.
Assessment postings were noted by A/CC on 1 Oct., 3 Oct. & 19 Oct.   -   References: DOUs 2011-T01, 2011-T18, 2011-U14, 2011-U23, 2011-U45, 2011-U61, 2011-U70 & 2011-U109
2011 SM68JPL Sentry0002 Oct. 8R E M O V E DRisk listing removed at 0857 UTC 7 Oct.
NEODyS0002 Oct. 8R E M O V E D
Assessment postings were noted by A/CC on 1 Oct., 2 Oct., 3 Oct. & 8 Oct.   -   References: DOUs 2011-T01, 2011-T06, 2011-T18, 2011-T22, 2011-T33, 2011-T36, 2011-T46, 2011-T53, 2011-T55, 2011-U01, 2011-U05, 2011-U14, 2011-U23, 2011-U33 & 2011-U45
2011 PE2NEODyS1544 Oct. 1R E M O V E D
JPL Sentry1544 Oct. 1R E M O V E DRisk listing removed at 0851 UTC 1 Oct.
Assessment postings were noted by A/CC on 1 Oct.   -   References: DOU 2011-T01

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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