A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During May 2011

Compiled at 2359 UTC on 31 May 2011

<< April 2011 CRT | CRT Archive Index | June 2011 CRT >>

[ Today's risk monitoring & other observing news | object risks cleared in May | 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
2011 KE15NEODyS1625 May 312020-2080104.14e-05-4.70-4.760Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-05-26.262 to 2011-05-31.032.
JPL Sentry1625 May 312020-204963.1e-05-4.82-4.870Analysis based on 14 observations spanning 4.7702 days (2011-May-26.26154 to 2011-May-31.03172). Diameter approximately 0.014 km. from mean, weighted H=26.9.
Assessment postings were noted by A/CC on 28 May, 29 May & 31 May   -   References: MPEC 2011-K40 plus DOU 2011-K53
2011 HJ7JPL Sentry1451 May 10209423.2e-08-6.26-6.560Analysis based on 32 observations spanning 12.956 days (2011-Apr-26.21907 to 2011-May-09.17508). Diameter approximately 0.120 km. from mean, weighted H=22.2.
Assessment postings were noted by A/CC on 1 May, 5 May, 6 May, 7 May, 8 May & 10 May   -   References: DOUs 2011-J01, 2011-J22, 2011-J27, 2011-J30, 2011-J33 & 2011-J40
2011 AG5JPL Sentry1458 May 92036-2052102.8e-04-1.89-1.891Analysis based on 128 observations spanning 119.19 days (2011-Jan-08.2673 to 2011-May-07.459). Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS1631 May 82036-2057132.73e-04-1.90-1.91Based on 128 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-05-07.460.
Assessment postings were noted by A/CC on 5 May, 7 May, 8 May & 9 May   -   References: DOUs 2011-J22 & 2011-J33
2009 VZ39JPL Sentry0406 May 12011-21108007.1e-06-6.04-6.800Analysis based on 8 observations spanning .04342 days (2009-Nov-10.27204 to 2009-Nov-10.31546). Diameter approximately 0.009 km. from mean, weighted H=27.9.
An assessment posting was noted by A/CC on 1 May   -   References: no recent MPECs
2009 BDJPL Sentry2117 May 42078-210871.9e-05-6.74-6.870Analysis based on 121 observations spanning 289.19 days (2009-Jan-16.27641 to 2009-Nov-01.468038). Diameter approximately 0.007 km. from mean, weighted H=28.4.
An assessment posting was noted by A/CC on 4 May   -   References: no recent MPECs
C   L   E   A   R   E   D
2011 JKJPL Sentry1537 May 6R E M O V E DRisk listing removed at 1055 UTC 6 May
NEODyS1502 May 5R E M O V E D
Assessment postings were noted by A/CC on 4 May, 5 May & 6 May   -   References: MPEC 2011-J12 plus DOUs 2011-J22, 2011-J27, 2011-J30, 2011-J35, 2011-J50, 2011-K01, 2011-K12 & 2011-K53
2011 HD63NEODyS1537 May 6R E M O V E D
JPL Sentry1537 May 6R E M O V E DRisk listing removed at 1222 UTC 6 May
Assessment postings were noted by A/CC on 5 May & 6 May   -   References: MPEC 2011-J17 plus DOUs 2011-J27, 2011-J33 & 2011-K17
2011 HB53NEODyS1458 May 9R E M O V E D
JPL Sentry1458 May 9R E M O V E DRisk listing removed at 1050 UTC 9 May
Assessment postings were noted by A/CC on 2 May, 4 May & 9 May   -   References: MPEC 2011-J03 plus DOUs 2011-J16, 2011-J35, 2011-J50 & 2011-K17
2011 HP24NEODyS1537 May 6R E M O V E D
JPL Sentry1537 May 6R E M O V E DRisk listing removed at 1129 UTC 6 May
Assessment postings were noted by A/CC on 1 May & 6 May   -   References: DOUs 2011-J27, 2011-J30 & 2011-J49
2011 HN24NEODyS1631 May 8R E M O V E D
Assessment postings were noted by A/CC on 3 May, 6 May, 7 May & 8 May   -   References: DOUs 2011-J07, 2011-J27, 2011-J30, 2011-J33 & 2011-J35
2011 HO5JPL Sentry1624 May 29R E M O V E DRisk listing removed at 1051 UTC 29 May
NEODyS1547 May 16R E M O V E D
Assessment postings were noted by A/CC on 2 May, 3 May, 5 May, 6 May, 8 May, 9 May, 11 May, 14 May, 15 May, 16 May, 17 May, 19 May & 29 May   -   References: DOUs 2011-J04, 2011-J07, 2011-J22, 2011-J27, 2011-J33, 2011-J35, 2011-J44, 2011-J51, 2011-J53, 2011-K01, 2011-K02, 2011-K09 & 2011-K43
2011 HS4JPL Sentry1605 May 1R E M O V E DRisk listing removed at 1155 UTC 1 May
An assessment posting was noted by A/CC on 1 May   -   References: DOUs 2011-J01, 2011-J04, 2011-J22, 2011-J27, 2011-J30, 2011-J33, 2011-J44, 2011-K01 & 2011-K15
2011 GN44NEODyS1614 May 7R E M O V E D
JPL Sentry1444 May 3R E M O V E DRisk listing removed at 1050 UTC 3 May
Assessment postings were noted by A/CC on 1 May, 3 May & 7 May   -   References: DOUs 2011-J01, 2011-J07 & 2011-J30
2011 BY24NEODyS1453 May 23R E M O V E D
JPL Sentry1453 May 23R E M O V E DRisk listing removed at 1049 UTC 23 May
Assessment postings were noted by A/CC on 23 May   -   References: DOUs 2011-K17 & 2011-K18

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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