A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During April 2011

Compiled at 2359 UTC on 30 April 2011

<< March 2011 CRT | CRT Archive Index | May 2011 CRT >>

[ Today's risk monitoring & other observing news | object risks cleared in April | 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 HP24JPL Sentry1559 April 302020-21081812.9e-06-5.81-6.340Analysis based on 11 observations spanning .88829 days (2011-Apr-28.43605 to 2011-Apr-29.324345). Diameter approximately 0.027 km. from mean, weighted H=25.5.
An assessment posting was noted by A/CC on 30 April   -   References: MPEC 2011-H63
2011 HJ7JPL Sentry2359 April 292018-208865.5e-09-6.13-6.420Analysis based on 12 observations spanning 3.0608 days (2011-Apr-26.21907 to 2011-Apr-29.2799). Diameter approximately 0.129 km. from mean, weighted H=22.2.
An assessment posting was noted by A/CC on 29 April   -   References: MPEC 2011-H52
2011 HO5NEODyS1400 April 292024-208681.56e-06-5.14-5.590Based on 15 optical observations (of which 0 are rejected as outliers) from 2011-04-27.400 to 2011-04-28.473.
JPL Sentry2359 April 282024-21102324.2e-06-4.75-5.280Analysis based on 15 observations spanning 1.0728 days (2011-Apr-27.39956 to 2011-Apr-28.47232). Diameter approximately 0.062 km. from mean, weighted H=23.7.
Assessment postings were noted by A/CC on 28 April & 29 April   -   References: MPEC 2011-H50
2011 HS4JPL Sentry1559 April 30209511.0e-09-6.89-6.890Analysis based on 25 observations spanning 2.9367 days (2011-Apr-26.43641 to 2011-Apr-29.37311). Diameter approximately 0.240 km. from mean, weighted H=20.7.
An assessment posting was noted by A/CC on 30 April   -   References: MPEC 2011-H46 plus DOU 2011-H59
2011 HP4NEODyS1609 April 282031-206855.27e-06-6.06-6.060Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-04-26.261 to 2011-04-28.008.
JPL Sentry0421 April 28203314.1e-06-6.17-6.170Analysis based on 13 observations spanning 1.7475 days (2011-Apr-26.25983 to 2011-Apr-28.00737). Diameter approximately 0.011 km. from mean, weighted H=27.5.
Assessment postings were noted by A/CC on 28 April   -   References: MPEC 2011-H43
2011 GN44NEODyS1400 April 292068-206815.9e-08-3.57-3.570Based on 47 optical observations (of which 0 are rejected as outliers) from 2011-04-03.444 to 2011-04-29.218.
JPL Sentry1400 April 29206811.1e-07-3.34-3.340Analysis based on 47 observations spanning 25.774 days (2011-Apr-03.44279 to 2011-Apr-29.21699). Diameter approximately 0.710 km. from mean, weighted H=18.4.
Assessment postings were noted by A/CC on 6 April, 7 April, 9 April, 10 April, 11 April, 13 April, 14 April, 22 April, 27 April, 28 April & 29 April   -   References: MPEC 2011-G46 plus DOUs 2011-G61, 2011-G66, 2011-G69, 2011-G75, 2011-G82, 2011-H21, 2011-H40, 2011-H47 & 2011-H51
2011 FA23NEODyS1640 April 12051-206332.43e-06-7.43-7.460Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-03-30.250 to 2011-03-31.434.
An assessment posting was noted by A/CC on 1 April   -   References: none in April
2004 FU162JPL Sentry0304 April 22011-21107835.2e-05-5.30-5.980Analysis based on 4 observations spanning .03055 days (2004-Mar-31.27744 to 2004-Mar-31.30799). Diameter approximately 0.006 km. from mean, weighted H=29.0.
Assessment postings were noted by A/CC on 1 April & 2 April   -   References: no recent MPECs
C   L   E   A   R   E   D
2011 HTJPL Sentry1609 April 28R E M O V E DRisk listing removed at 1050 UTC 28 April
NEODyS1609 April 28R E M O V E D
Assessment postings were noted by A/CC on 26 April, 27 April & 28 April   -   References: MPEC 2011-H35 plus DOUs 2011-H40, 2011-H47, 2011-H51 & 2011-H59
2011 HSJPL Sentry1609 April 28R E M O V E DRisk listing removed at 1129 UTC 28 April
NEODyS1609 April 28R E M O V E D
Assessment postings were noted by A/CC on 26 April, 27 April & 28 April   -   References: MPEC 2011-H34 plus DOUs 2011-H40, 2011-H47, 2011-H51 & 2011-H59
2011 HFNEODyS1618 April 27R E M O V E D
JPL Sentry1618 April 27R E M O V E DRisk listing removed at 1140 UTC 27 April
Assessment postings were noted by A/CC on 23 April, 24 April, 25 April, 26 April & 27 April   -   References: MPEC 2011-H25 plus DOUs 2011-H26, 2011-H30, 2011-H37, 2011-H40 & 2011-H59
2011 GS60JPL Sentry1638 April 15R E M O V E DRisk listing removed at 1133 UTC 15 April
NEODyS1638 April 15R E M O V E D
Assessment postings were noted by A/CC on 11 April, 12 April, 14 April & 15 April   -   References: MPEC 2011-G68 plus DOUs 2011-G71, 2011-G82, 2011-G89, 2011-H09, 2011-H12, 2011-H20, 2011-H21 & 2011-H23
2011 GR59JPL Sentry1602 April 10R E M O V E DRisk listing removed at 1139 UTC 10 April
Assessment postings were noted by A/CC on 9 April & 10 April   -   References: MPEC 2011-G63 plus DOUs 2011-G66, 2011-G69, 2011-G71, 2011-G82, 2011-G89, 2011-H10, 2011-H20 & 2011-H21
2011 GP59NEODyS1602 April 10R E M O V E D
Assessment postings were noted by A/CC on 9 April & 10 April   -   References: MPEC 2011-G60 plus DOUs 2011-G61, 2011-G66, 2011-G71, 2011-G75, 2011-G82, 2011-G89, 2011-H09, 2011-H12 & 2011-H21
2011 GA55NEODyS1602 April 10R E M O V E D
JPL Sentry1602 April 10R E M O V E DRisk listing removed at 1136 UTC 10 April
Assessment postings were noted by A/CC on 7 April, 8 April & 10 April   -   References: MPEC 2011-G53 plus DOUs 2011-G66, 2011-G75, 2011-G89, 2011-H04, 2011-H09, 2011-H21 & 2011-H40
2011 GO27NEODyS1550 April 6R E M O V E D
JPL Sentry1550 April 6R E M O V E DRisk listing removed at 1136 UTC 6 April
Assessment postings were noted by A/CC on 5 April & 6 April   -   References: MPEC 2011-G36 plus DOUs 2011-G40, 2011-G51, 2011-G61, 2011-G82 & 2011-H51
2011 GJ3JPL Sentry1526 April 7R E M O V E DRisk listing removed at 1149 UTC 7 April
NEODyS1550 April 6R E M O V E D
Assessment postings were noted by A/CC on 4 April, 6 April & 7 April   -   References: MPEC 2011-G32 plus DOUs 2011-G33, 2011-G40, 2011-G51, 2011-G69, 2011-H21 & 2011-H23
2011 GH3NEODyS1550 April 6R E M O V E D
JPL Sentry1550 April 6R E M O V E DRisk listing removed at 1131 UTC 6 April
Assessment postings were noted by A/CC on 4 April & 6 April   -   References: MPEC 2011-G31 plus DOUs 2011-G40, 2011-G71, 2011-H40 & 2011-H51
2011 GZ2NEODyS1526 April 7R E M O V E D
JPL Sentry1526 April 7R E M O V E DRisk listing removed at 1133 UTC 7 April
Assessment postings were noted by A/CC on 3 April, 4 April, 6 April & 7 April   -   References: MPEC 2011-G22 plus DOUs 2011-G33, 2011-G40, 2011-G51, 2011-G57 & 2011-G61
2011 GE2NEODyS1607 April 5R E M O V E D
JPL Sentry1601 April 3R E M O V E DRisk listing removed at 1146 UTC 3 April
Assessment postings were noted by A/CC on 2 April, 3 April & 5 April   -   References: MPEC 2011-G20 plus DOUs 2011-G21, 2011-G37, 2011-G40, 2011-G71 & 2011-H47
2011 GBJPL Sentry1607 April 5R E M O V E DRisk listing removed at 1144 UTC 5 April
Assessment postings were noted by A/CC on 2 April, 3 April & 5 April   -   References: MPEC 2011-G13 plus DOUs 2011-G21, 2011-G37, 2011-G40, 2011-G51, 2011-G75, 2011-G82, 2011-G89 & 2011-H51
2011 GANEODyS1602 April 10R E M O V E D
JPL Sentry1602 April 10R E M O V E DRisk listing removed at 1051 UTC 10 April
Assessment postings were noted by A/CC on 3 April, 5 April, 6 April, 7 April, 9 April & 10 April   -   References: MPEC 2011-G12 plus DOUs 2011-G37, 2011-G40, 2011-G51, 2011-G61, 2011-G66, 2011-G82, 2011-G89 & 2011-H21
2011 FY22NEODyS1640 April 1R E M O V E D
JPL Sentry1640 April 1R E M O V E DRisk listing removed at 1048 UTC 1 April
An assessment posting was noted by A/CC on 1 April   -   References: DOUs 2011-G01, 2011-G08, 2011-G21, 2011-G37, 2011-G40 & 2011-G89
2011 EU29JPL Sentry1607 April 5R E M O V E DRisk listing removed at 1052 UTC 5 April
NEODyS1601 April 3R E M O V E D
Assessment postings were noted by A/CC on 3 April, 4 April & 5 April   -   References: DOUs 2011-G21, 2011-G33, 2011-G37 & 2011-G61

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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