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 HM73	NEODyS	1327 April 30	2086	1	4.3e-11	-9.68	-9.68	0	Based on 20 optical observations (of which 0 are rejected as outliers) from 2009/04/28.375 to 2009/04/30.216.
	JPL Sentry	1327 April 30	2066	1	3.2e-10	-8.52	-8.52	0	Analysis 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 HW67	NEODyS	1327 April 30	2046-2079	6	1.51e-06	-6.08	-6.43	0	Based on 26 optical observations (of which 0 are rejected as outliers) from 2009/04/27.297 to 2009/04/30.229.
	JPL Sentry	1327 April 30	2046-2079	4	1.3e-06	-6.17	-6.51	0	Analysis 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 HV58	NEODyS	1327 April 30	2011-2090	41	3.74e-08	-3.39	-3.49	0	Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/04/29.378.
	JPL Sentry	1327 April 30	2011-2108	45	5.5e-08	-3.33	-3.49	0	Analysis 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 HC	JPL Sentry	1327 April 30	2097-2099	5	1.0e-06	-6.40	-6.93	0	Analysis 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.
2009 HC	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 FJ	NEODyS	1521 April 18	2058-2088	4	2.38e-05	-4.65	-4.67	0	Based on 131 optical observations (of which 7 are rejected as outliers) from 2009/03/17.245 to 2009/04/17.274.
	JPL Sentry	1520 April 18	2058-2107	10	2.4e-05	-4.64	-4.67	0	Analysis 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 FG	NEODyS	1422 April 1	2049-2087	21	4.27e-06	-5.79	-6.14	0	Based on 65 optical observations (of which 0 are rejected as outliers) from 2009/03/16.399 to 2009/04/01.235.
	JPL Sentry	1422 April 1	2022-2107	36	7.1e-06	-5.58	-6.13	0	Analysis 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)	NEODyS	1624 April 25	2036-2083	17	1.98e-05	-2.61	-2.62	0	Based 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.
99942 Apophis (2004 MN4)	An assessment posting was noted by A/CC on 25 April - References: no recent MPECs

2004 FU162	JPL Sentry	0306 April 1	2010-2108	956	5.8e-05	-5.32	-6.01	0	Analysis 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.
2004 FU162	An assessment posting was noted by A/CC on 1 April - References: no recent MPECs
C L E A R E D
2009 HE60	JPL Sentry	1330 April 29	R E M O V E D						Risk listing removed at 0856 UTC 29 April
2009 HE60	Assessment postings were noted by A/CC on 27 April & 29 April - References: MPECs 2009-H61 & 2009-H77

2009 HX51	NEODyS	1501 April 26	R E M O V E D
	JPL Sentry	1501 April 26	R E M O V E D						Risk 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 HL21	NEODyS	1332 April 23	R E M O V E D
	JPL Sentry	1332 April 23	R E M O V E D						Risk 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 HD21	NEODyS	1322 April 28	R E M O V E D
	JPL Sentry	1322 April 28	R E M O V E D						Risk 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 HA21	JPL Sentry	1334 April 24	R E M O V E D						Risk listing removed at 0857 UTC 24 April
	NEODyS	1334 April 24	R 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 HU2	NEODyS	1330 April 29	R E M O V E D
	JPL Sentry	1330 April 29	R E M O V E D						Risk 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 HE	JPL Sentry	1332 April 23	R E M O V E D						Risk listing removed at 0852 UTC 23 April
	NEODyS	1318 April 20	R 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 FJ30	JPL Sentry	1348 April 2	R E M O V E D						Risk listing removed at 0851 UTC 2 April
	NEODyS	1422 April 1	R 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 FG19	JPL Sentry	1430 April 5	R E M O V E D						Risk listing removed at 0850 UTC 5 April
	NEODyS	1348 April 2	R 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 FE	JPL Sentry	1348 April 2	R E M O V E D						Risk listing removed at 0851 UTC 2 April
	NEODyS	1422 April 1	R 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.

http://www.HohmannTransfer.com/news/crt0904.htm
Publisher information, privacy statement, and disclaimer.
Please report broken links or other problems with this page to <webmaster@hohmanntransfer.com>.
The data and tabular formats on this page are acknowledged as belonging to JPL and NEODyS.
This page is © Copyright 2003-2009 Columbine, Inc. - All Rights Reserved
Do NOT copy or mirror this page, but please do link to it. All information here is subject to (sometimes critically important) change.
Individuals may make "snapshot" copies for their own private non-commercial use.
CRT updates are flagged by A/CC's RSS news feed (link)