A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During August 2011

Compiled at 0051 UTC on 1 September 2011

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

[ Today's risk monitoring & other observing news | object risks cleared in August | 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 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 PE2NEODyS1521 Aug. 302027-209041.21e-04-2.53-2.530Based on 68 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-30.215.
JPL Sentry1521 Aug. 302027-210362.5e-04-2.23-2.230Analysis based on 68 observations spanning 22.150 days (2011-Aug-08.06387 to 2011-Aug-30.21401). Diameter approximately 0.084 km. from mean, weighted H=23.0.
Assessment postings were noted by A/CC on 9 Aug., 10 Aug., 12 Aug., 13 Aug., 14 Aug., 17 Aug., 18 Aug., 21 Aug., 22 Aug., 24 Aug., 28 Aug., 29 Aug. & 30 Aug.   -   References: MPEC 2011-P40 plus DOUs 2011-P42, 2011-P46, 2011-P48, 2011-P50, 2011-Q02, 2011-Q03, 2011-Q07, 2011-Q11, 2011-Q20, 2011-Q44, 2011-Q46 & 2011-Q52
2011 PU1NEODyS1710 Aug. 282061-20901012.82e-04-3.88-4.340Based on 38 optical observations (of which 1 are rejected as outliers) from 2011-08-06.968 to 2011-08-27.253.
JPL Sentry1544 Aug. 282061-2102652.0e-04-4.03-4.500Analysis based on 38 observations spanning 20.284 days (2011-Aug-06.9677 to 2011-Aug-27.252129). Diameter approximately 0.032 km. from mean, weighted H=25.1.
Assessment postings were noted by A/CC on 8 Aug., 9 Aug., 10 Aug., 12 Aug., 13 Aug., 21 Aug., 22 Aug., 27 Aug. & 28 Aug.   -   References: MPEC 2011-P36 plus DOUs 2011-P42, 2011-P46, 2011-P48, 2011-Q07, 2011-Q11, 2011-Q38 & 2011-Q44
2011 PN1JPL Sentry1535 Aug. 62021-21101055.4e-07-7.58-8.220Analysis based on 6 observations spanning 1.0655 days (2011-Aug-02.47123 to 2011-Aug-03.536708). Diameter approximately 0.010 km. from mean, weighted H=27.8.
An assessment posting was noted by A/CC on 6 Aug.   -   References: MPEC 2011-P28
2011 OB26NEODyS2203 Aug. 112076-208841.21e-09-9.29-9.430Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-07-28.474 to 2011-08-07.110.
JPL Sentry1610 Aug. 82074-2109234.0e-05-4.94-5.410Analysis based on 26 observations spanning 9.6359 days (2011-Jul-28.4734 to 2011-Aug-07.109334). Diameter approximately 0.027 km. from mean, weighted H=25.5.
Assessment postings were noted by A/CC on 3 Aug., 4 Aug., 5 Aug., 6 Aug., 7 Aug., 8 Aug. & 11 Aug.   -   References: MPEC 2011-P10 plus DOUs 2011-P21, 2011-P26, 2011-P30 & 2011-P34
2011 AG5NEODyS1704 Aug. 302040-204791.63e-03-1.12-1.121Based on 187 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-08-25.421.
JPL Sentry1704 Aug. 302040-204756.5e-04-1.51-1.511Analysis based on 187 observations spanning 229.15 days (2011-Jan-08.2673 to 2011-Aug-25.42026). Diameter approximately 0.140 km. from mean, weighted H=21.9.
Assessment postings were noted by A/CC on 26 Aug., 29 Aug. & 30 Aug.   -   References: DOUs 2011-Q30 & 2011-Q52
C   L   E   A   R   E   D
2011 QF14NEODyS1723 Aug. 27R E M O V E D
JPL Sentry1723 Aug. 27R E M O V E DRisk listing removed at 0955 UTC 27 Aug.
Assessment postings were noted by A/CC on 25 Aug., 26 Aug. & 27 Aug.   -   References: MPEC 2011-Q29 plus DOUs 2011-Q38, 2011-Q44, 2011-Q46, 2011-Q52 & 2011-Q55
2011 PO1JPL Sentry1737 Aug. 9R E M O V E DRisk listing removed at 0849 UTC 9 Aug.
Assessment postings were noted by A/CC on 6 Aug. & 9 Aug.   -   References: MPEC 2011-P29 plus DOUs 2011-P38, 2011-P42, 2011-P46, 2011-P48, 2011-P50, 2011-P57, 2011-Q01, 2011-Q02, 2011-Q03, 2011-Q06 & 2011-Q11
2011 OF26JPL Sentry1552 Aug. 11R E M O V E DRisk listing removed at 0952 UTC 11 Aug.
Assessment postings were noted by A/CC on 6 Aug. & 11 Aug.   -   References: MPEC 2011-P27 plus DOU 2011-P45
2011 OD18JPL Sentry1611 Aug. 3R E M O V E DRisk listing removed at 0951 UTC 3 Aug.
NEODyS1603 Aug. 2R E M O V E D
Assessment postings were noted by A/CC on 1 Aug., 2 Aug. & 3 Aug.   -   References: DOUs 2011-P05, 2011-P09, 2011-P30 & 2011-P38
2011 KE15NEODyS1547 Aug. 13R E M O V E D
JPL Sentry1547 Aug. 13R E M O V E DRisk listing removed at 0952 UTC 13 Aug.
Assessment postings were noted by A/CC on 13 Aug.   -   References: DOU 2011-P48

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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