Contents  on 5 May '09


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 5 May '09

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. All of these were "one nighters." So far The Tracking News has counted a total of six listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 5 May '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-J27 - "18:02 UT" - 2009 JG1

MPEC 2009-J26 - "18:00 UT" - 2009 JF1

MPEC 2009-J25 - "17:54 UT" - 2009 JE1

<< DOU on 5 May '09 >>  MPEC 2009-J24 - "06:10 UT" - Daily Orbit Update

Observers  on 5 May '09

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2009-J24 -- 207945, 143651
A81Balzaretto Obs. in Italy, 1 in MPEC 2009-J24 -- 2007 BT2
160Castelmartini Obs. in Italy, 4 in MPEC 2009-J24 -- 2009 HV44, 2009 HM82, 2009 CQ1, 207945
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2009-J24 -- 2009 HV44, 2009 HM82, 2008 JV19, 2005 YS165, 184990, 138883
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2009-J24 -- 2009 HV44, 2009 HM82
A27Eridanus Obs. in Germany, 2 in MPEC 2009-J24 -- 2008 WN2, 5604
J28Jaen Obs. in Spain, 1 in MPEC 2009-J24 -- 90367
J75La Sagra Obs. in Spain, 7 in MPEC 2009-J24 -- 2009 HL21, 2009 CQ1, 2008 WN2, 86666, 40329, 143947, 138911
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2009-J24 -- 2009 DF1, 159399
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2009-J24, 2009-J25 & 2009-J26 -- 2009 JF1, 2009 JE1, 2009 HE82, 154993
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPECs 2009-J24, 2009-J26 & 2009-J27 -- 2009 JG1, 2009 JF1, 2001 SG286, 88254, 4954
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-J24 -- 27346
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2009-J24 -- 2009 HV58, 2009 HF82, 2009 HC82, 2009 HC
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 May '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2009 JF1JPL Sentry2000202213.3e-04-3.59-3.590JPL: "Analysis based on 25 observations spanning 1.2388 days (2009-May-04.42059 to 2009-May-05.659412)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2009 JE1JPL Sentry22002044-210093.3e-08-8.84-8.970JPL: "Analysis based on 10 observations spanning .06837 days (2009-May-04.36574 to 2009-May-04.43411)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2009 HC82JPL Sentry13052012-203833.4e-09-2.15-2.160JPL: "Analysis based on 26 observations spanning 5.8252 days (2009-Apr-29.37373 to 2009-May-05.19896)." Diameter approximately 1.900 km. from mean, weighted H=16.3.
NEODyS13052012-202222.57e-09-2.23-2.230NEODyS: "Based on 27 optical observations (of which 1 are rejected as outliers) from 2009/04/29.374 to 2009/05/05.200."
2009 HV58JPL Sentry13052011-210592.5e-07-3.61-4.230JPL: "Analysis based on 33 observations spanning 8.8764 days (2009-Apr-25.39439 to 2009-May-04.2708)." Diameter approximately 0.440 km. from mean, weighted H=19.4.
NEODyS13052011-209081.62e-07-3.74-4.290NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/05/04.272."
2009 HCNEODyS1400209014.95e-08-7.67-7.670NEODyS: "Based on 113 optical observations (of which 2 are rejected as outliers) from 2009/04/17.232 to 2009/05/05.217."
JPL Sentry13052079-209862.1e-06-6.08-6.710JPL: "Analysis based on 111 observations spanning 17.985 days (2009-Apr-17.23164 to 2009-May-05.21619)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

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" to learn more.

Chronology  on 5 May '09

Times are UTC for when items were noted or added by The Tracking News.

2200Noted that JPL Sentry has posted 2009 JE1 as an impact risk - see above
2000Noted that JPL Sentry has posted 2009 JF1 as an impact risk - see above
1900Grabbed MPEC 2009-J25 - 2009 JE1 - see above
Grabbed MPEC 2009-J26 - 2009 JF1 - see above
Grabbed MPEC 2009-J27 - 2009 JG1 - see above
1400Noted that NEODyS has posted 2009 HC as an impact risk - see above
1306Grabbed MPEC 2009-J24 - Daily Orbit Update - see above
1305Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that JPL Sentry has updated its 2009 HC82 risk assessment - see above
Noted that NEODyS has updated its 2009 HC82 risk assessment - see above
Noted that JPL Sentry has updated its 2009 HV58 risk assessment - see above
Noted that NEODyS has updated its 2009 HV58 risk assessment - see above