Contents  on 2 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 2 May '09

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and one updated listing. Both of these were "one nighters." So far The Tracking News has counted a total of seven 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 2 May '09

Minor Planet Electronic Circulars

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

MPEC 2009-J11 - "15:13 UT" - 2009 HF88

<< DOU on 2 May '09 >>  MPEC 2009-J10 - "06:10 UT" - Daily Orbit Update

Observers  on 2 May '09

A total of 23 observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 3 in MPEC 2009-J10 -- 2009 JA, 2009 HG60, 2009 FU23
A81Balzaretto Obs. in Italy, 3 in MPEC 2009-J10 -- 2009 HK73, 207945, 143651
B88Bigmuskie Obs. in Italy, 1 in MPEC 2009-J10 -- 1998 SC15
300Bisei Spaceguard Center in Japan, 1 in MPEC 2009-J10 -- 2009 HD82
703Catalina Sky Survey in Arizona, 1 in MPEC 2009-J10 -- 143651
I21El Condor Obs. in Argentina, 3 in MPEC 2009-J10 -- 136617, 3552, 1036
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2009-J10 -- 2009 HZ67
J95Great Shefford Obs. in England, 2 in MPEC 2009-J10 -- 2009 JA, 2009 HM82
E16Grove Creek Obs. in New South Wales, 5 in MPEC 2009-J10 -- 2009 HG60, 2009 HD, 2009 DL1, 2009 DE47, 2008 WN2
A17Guidestar Obs. in Germany, 1 in MPEC 2009-J10 -- 2009 HU58
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2009-J10 -- 2009 HV44, 2008 WL60, 2007 BT2
704LINEAR in New Mexico, 4 in MPEC 2009-J10 -- 2004 JN13, 155334, 5604, 1036
J87La Canada Obs. in Spain, 1 in MPEC 2009-J10 -- 2000 FL1
474Mt. John Obs. in New Zealand, 1 in MPEC 2009-J11 -- 2009 HF88
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2009-J10 -- 2006 TK, 1990 UA, 203217, 177614
J93Mt. Tuffley Obs. in England, 1 in MPEC 2009-J10 -- 143651
J41Raheny Obs. in Ireland, 1 in MPEC 2009-J10 -- 2009 HC82
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-J10 -- 2009 HL21, 2009 HF21, 2009 HE
E12Siding Spring Survey (SSS) in New South Wales, 9 in MPEC 2009-J10 -- 2009 HG, 2009 HD, 2009 EC, 2009 DE47, 2008 WN2, 2008 SV11, 2004 FU64, 52768, 3988
587Sormano Obs. in Italy, 3 in MPEC 2009-J10 -- 2009 HK73, 2009 HG60, 2009 FU23
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2009-J10 & 2009-J11 -- 2009 HF88, 2003 WO7
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2009-J10 & 2009-J11 -- 2009 HV58, 2009 HU2, 2009 HF88, 2009 HD82, 2009 HC
A92Urseanu Obs. in Romania, 2 in MPEC 2009-J10 -- 207945, 143651
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 HF82NEODyS14492011-208439.81e-10-6.18-6.480NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2009/04/30.292 to 2009/05/01.193."
2009 HV58JPL Sentry14492011-2108212.1e-07-2.52-2.550JPL: "Analysis based on 29 observations spanning 5.9442 days (2009-Apr-25.39439 to 2009-May-01.33857)." Diameter approximately 0.440 km. from mean, weighted H=19.4.
NEODyS14492011-2090151.59e-07-2.55-2.580NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/05/01.339."
2009 HCJPL Sentry14492097-209841.3e-06-6.29-6.810JPL: "Analysis based on 105 observations spanning 13.928 days (2009-Apr-17.23164 to 2009-May-01.16005)." 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 2 May '09

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

1901Grabbed MPEC 2009-J11 - 2009 HF88 - see above
1449Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that NEODyS has posted 2009 HF82 as an impact risk - 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
Grabbed MPEC 2009-J10 - Daily Orbit Update - see above