A/CC's Consolidated Risk Tables

Earth Impact Risk Ratings Posted During April 2009

Compiled on 2 May 2009

<< March 2009 CRT | CRT Archive Index | May 2009 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.

Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090, plus (since 22 Jan. 2009) 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
2009 HM73NEODyS1327 April 30208614.3e-11-9.68-9.680Based on 20 optical observations (of which 0 are rejected as outliers) from 2009/04/28.375 to 2009/04/30.216.
JPL Sentry1327 April 30206613.2e-10-8.52-8.520Analysis based on 20 observations spanning 1.8418 days (2009-Apr-28.37383 to 2009-Apr-30.21564). Diameter approximately 0.096 km. from mean, weighted H=22.7.
Assessment postings were noted by A/CC on 29 April & 30 April   -   References: MPECs 2009-H80 & 2009-H81
2009 HW67NEODyS1327 April 302046-207961.51e-06-6.08-6.430Based on 26 optical observations (of which 0 are rejected as outliers) from 2009/04/27.297 to 2009/04/30.229.
JPL Sentry1327 April 302046-207941.3e-06-6.17-6.510Analysis based on 26 observations spanning 2.9325 days (2009-Apr-27.29601 to 2009-Apr-30.22847). Diameter approximately 0.020 km. from mean, weighted H=26.1.
Assessment postings were noted by A/CC on 28 April, 29 April & 30 April   -   References: MPECs 2009-H73 & 2009-H81
2009 HV58NEODyS1327 April 302011-2090413.74e-08-3.39-3.490Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/04/29.378.
JPL Sentry1327 April 302011-2108455.5e-08-3.33-3.490Analysis based on 23 observations spanning 3.9831 days (2009-Apr-25.39439 to 2009-Apr-29.37752). Diameter approximately 0.451 km. from mean, weighted H=19.4.
Assessment postings were noted by A/CC on 27 April & 30 April   -   References: MPECs 2009-H59 & 2009-H81
2009 HCJPL Sentry1327 April 302097-209951.0e-06-6.40-6.930Analysis based on 99 observations spanning 12.045 days (2009-Apr-17.23164 to 2009-Apr-29.2771). Diameter approximately 0.036 km. from mean, weighted H=24.9.
Assessment postings were noted by A/CC on 18 April, 20 April, 21 April, 22 April, 23 April, 24 April, 25 April, 26 April, 27 April, 28 April, 29 April & 30 April   -   References: MPECs 2009-H05, 2009-H18, 2009-H25, 2009-H36, 2009-H39, 2009-H51, 2009-H54, 2009-H55, 2009-H60, 2009-H64, 2009-H77 & 2009-H81
2009 FJNEODyS1521 April 182058-208842.38e-05-4.65-4.670Based on 131 optical observations (of which 7 are rejected as outliers) from 2009/03/17.245 to 2009/04/17.274.
JPL Sentry1520 April 182058-2107102.4e-05-4.64-4.670Analysis based on 124 observations spanning 30.964 days (2009-Mar-17.30916 to 2009-Apr-17.27361). Diameter approximately 0.036 km. from mean, weighted H=24.9.
Assessment postings were noted by A/CC on 1 April, 2 April, 3 April, 6 April, 17 April & 18 April   -   References: MPECs 2009-G01, 2009-G06, 2009-G08, 2009-G19, 2009-H02 & 2009-H04
2009 FGNEODyS1422 April 12049-2087214.27e-06-5.79-6.140Based on 65 optical observations (of which 0 are rejected as outliers) from 2009/03/16.399 to 2009/04/01.235.
JPL Sentry1422 April 12022-2107367.1e-06-5.58-6.130Analysis based on 65 observations spanning 15.836 days (2009-Mar-16.3986 to 2009-Apr-01.2342). Diameter approximately 0.027 km. from mean, weighted H=25.5.
Assessment postings were noted by A/CC on 1 April   -   References: MPEC 2009-G01
99942 Apophis (2004 MN4)NEODyS1624 April 252036-2083171.98e-05-2.61-2.620Based on 1000 optical observations (of which 5 are rejected as outliers) from 2004/03/15.108 to 2006/08/16.627, and also on seven radar data points on 2005/01/27, 2005/01/29, 2005/01/31, 2005/08/07 and 2006/05/06.
An assessment posting was noted by A/CC on 25 April   -   References: no recent MPECs
2004 FU162JPL Sentry0306 April 12010-21089565.8e-05-5.32-6.010Analysis 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.
An assessment posting was noted by A/CC on 1 April   -   References: no recent MPECs
C   L   E   A   R   E   D
2009 HE60JPL Sentry1330 April 29R E M O V E DRisk listing removed at 0856 UTC 29 April
Assessment postings were noted by A/CC on 27 April & 29 April   -   References: MPECs 2009-H61 & 2009-H77
2009 HX51NEODyS1501 April 26R E M O V E D
JPL Sentry1501 April 26R E M O V E DRisk listing removed at 0850 UTC 26 April
Assessment postings were noted by A/CC on 24 April, 25 April & 26 April   -   References: MPECs 2009-H52, 2009-H55, 2009-H60 & 2009-H81
2009 HL21NEODyS1332 April 23R E M O V E D
JPL Sentry1332 April 23R E M O V E DRisk listing removed at 0852 UTC 23 April
Assessment postings were noted by A/CC on 22 April & 23 April   -   References: MPECs 2009-H35, 2009-H36, 2009-H39, 2009-H51, 2009-H54, 2009-H60, 2009-H64 & 2009-H81
2009 HD21NEODyS1322 April 28R E M O V E D
JPL Sentry1322 April 28R E M O V E DRisk listing removed at 0850 UTC 28 April
Assessment postings were noted by A/CC on 21 April, 22 April, 23 April, 27 April & 28 April   -   References: MPECs 2009-H29, 2009-H36, 2009-H39, 2009-H60 & 2009-H64
2009 HA21JPL Sentry1334 April 24R E M O V E DRisk listing removed at 0857 UTC 24 April
NEODyS1334 April 24R E M O V E D
Assessment postings were noted by A/CC on 21 April, 22 April & 24 April   -   References: MPECs 2009-H26, 2009-H51, 2009-H54 & 2009-H77
2009 HU2NEODyS1330 April 29R E M O V E D
JPL Sentry1330 April 29R E M O V E DRisk listing removed at 0849 UTC 29 April
Assessment postings were noted by A/CC on 20 April, 21 April, 22 April, 23 April, 24 April, 27 April, 28 April & 29 April   -   References: MPECs 2009-H22, 2009-H36, 2009-H39, 2009-H51, 2009-H60, 2009-H64 & 2009-H77
2009 HEJPL Sentry1332 April 23R E M O V E DRisk listing removed at 0852 UTC 23 April
NEODyS1318 April 20R E M O V E D
Assessment postings were noted by A/CC on 18 April, 19 April, 20 April, 21 April & 23 April   -   References: MPECs 2009-H07, 2009-H18, 2009-H25, 2009-H39 & 2009-H51
2009 FJ30JPL Sentry1348 April 2R E M O V E DRisk listing removed at 0851 UTC 2 April
NEODyS1422 April 1R E M O V E D
Assessment postings were noted by A/CC on 1 April & 2 April   -   References: MPECs 2009-G01, 2009-G06, 2009-G17, 2009-G19, 2009-G23, 2009-G33, 2009-G35, 2009-G42, 2009-H02, 2009-H04, 2009-H17, 2009-H18 & 2009-H51
2009 FG19JPL Sentry1430 April 5R E M O V E DRisk listing removed at 0850 UTC 5 April
NEODyS1348 April 2R E M O V E D
Assessment postings were noted by A/CC on 1 April, 2 April & 5 April   -   References: MPECs 2009-G01, 2009-G06, 2009-G17, 2009-H02, 2009-H18, 2009-H51 & 2009-H77
2009 FEJPL Sentry1348 April 2R E M O V E DRisk listing removed at 0851 UTC 2 April
NEODyS1422 April 1R E M O V E D
Assessment postings were noted by A/CC on 1 April & 2 April   -   References: MPECs 2009-G01, 2009-G06, 2009-G08 & 2009-G39

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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