A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During July 2011

Compiled at 2359 UTC on 31 July 2011

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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.


 A/CC  Noted 
 Time & Day 



Notes for Latest Risk Assessments
2011 OD18JPL Sentry1537 July 312034-208061.6e-07-7.54-7.960Analysis based on 10 observations spanning .09450 days (2011-Jul-31.05702 to 2011-Jul-31.15152). Diameter approximately 0.019 km. from mean, weighted H=26.3.
An assessment posting was noted by A/CC on 31 July   -   References: MPEC 2011-O71
2011 AG5JPL Sentry1700 July 102040-204754.4e-04-1.67-1.681Analysis based on 181 observations spanning 182.21 days (2011-Jan-08.2673 to 2011-Jul-09.47379). Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS1530 July 102040-204761.26e-03-1.22-1.221Based on 181 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-07-09.475.
Assessment postings were noted by A/CC on 2 July, 6 July, 8 July & 10 July   -   References: DOUs 2011-N07, 2011-N24, 2011-N32 & 2011-N38
C   L   E   A   R   E   D
2011 OY17JPL Sentry1537 July 31R E M O V E DRisk listing removed at 0949 UTC 31 July
Assessment postings were noted by A/CC on 30 July & 31 July   -   References: MPEC 2011-O67 plus DOU 2011-O69
2011 MD5NEODyS1618 July 5R E M O V E D
JPL Sentry1618 July 5R E M O V E DRisk listing removed at 0950 UTC 5 July
Assessment postings were noted by A/CC on 3 July & 5 July   -   References: MPEC 2011-N15 plus DOUs 2011-N21, 2011-N24, 2011-N32, 2011-O11 & 2011-O54
2011 MO4NEODyS1645 July 3R E M O V E D
Assessment postings were noted by A/CC on 2 July & 3 July   -   References: MPEC 2011-N04 plus DOUs 2011-N18, 2011-N24, 2011-N27, 2011-N32, 2011-N39, 2011-N42, 2011-O01, 2011-O11, 2011-O26, 2011-O27, 2011-O30 & 2011-O58
2011 MDJPL Sentry2315 July 6R E M O V E D
NEODyS1618 July 5R E M O V E D
Assessment postings were noted by A/CC on 1 July, 2 July, 5 July & 6 July   -   References: DOUs 2011-N01, 2011-N07, 2011-N20 & 2011-N24
2005 SP1JPL Sentry1620 July 22R E M O V E DRisk listing removed at 1053 UTC 22 July
An assessment posting was noted by A/CC on 22 July   -   References: DOU 2011-O22

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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