Contents  on 31 May '09

Note: These A/CC news pages will probably not update again until after midnight UTC today, Sunday, May 31st.


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 31 May '09

The MPC's NEO Confirmation Page has 5 listings: 2 new, 3 updated

When last checked at 2146 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and three updated listings. Of these, one was a "one nighter." So far The Tracking News has counted a total of eleven 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 31 May '09

Minor Planet Electronic Circulars

As of last check at 2146 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-K78 - "20:16 UT" - 2009 KR21

<< DOU on 31 May '09 >>  MPEC 2009-K77 - "06:09 UT" - Daily Orbit Update

Observers  on 31 May '09

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-K77 -- 85989
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2009-K77 -- 2009 JM2, 159399, 138883
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2009-K77 & 2009-K78 -- 2009 KR21, 2009 KQ4, 2009 JK1, 2009 BL2, 2008 JV19, 163051, 3103, 1943
J95Great Shefford Obs. in England, 3 in MPEC 2009-K77 -- 2009 KO4, 2009 KL8, 2009 KL2
B19Iluro Obs. in Spain, 3 in MPEC 2009-K77 -- 15745, 154244, 5620
704LINEAR in New Mexico, 23 in MPEC 2009-K77 -- 2008 SX245, 2008 MR1, 2007 VW137, 2004 AR1, 96744, 85867, 24445, 198752, 189973, 185851, 184266, 164202, 163760, 159399, 142040, 138205, 136617, 6456, 5751, 5646, 5143, 4486, 1866
J59Linceo Obs. in Spain, 1 in MPEC 2009-K77 -- 5620
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-K77 -- 2007 DD
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2009-K77 -- 2003 HF2, 5869
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2009-K77 -- 2009 JM2, 2009 JK1, 2009 HG, 2009 EQ2, 2005 MO13
D21Shenton Park Obs. in Western Australia, 3 in MPEC 2009-K77 -- 2009 KN4, 2009 KC7, 2009 CR4
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-K77 -- 4954
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2009-K77 -- 2009 KO4, 2009 KE5, 2009 JR5, 2009 HM73, 2009 HF88, 2009 DF1, 99799, 153311
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2009-K77 -- 2009 KN, 2009 JR5, 2009 HY51, 2009 HW44, 2009 HM73, 2009 HL21, 2009 HF88, 2004 LC2
198Wildberg Obs. in Germany, 1 in MPEC 2009-K77 -- 1998 SC15
J08Zonalunar Obs. in Spain, 1 in MPEC 2009-K77 -- 90367
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 May '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2146 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 KK8NEODyS15122017-207322.77e-08-4.47-4.670NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2009/05/28.435 to 2009/05/30.460."
2009 KN4JPL Sentry15122077-209272.0e-07-3.59-3.720JPL: "Analysis based on 23 observations spanning 5.9567 days (2009-May-23.78358 to 2009-May-29.74028)." Diameter approximately 0.799 km. from mean, weighted H=18.2.
NEODyS15122077-208861.52e-07-3.71-3.820NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/05/23.784 to 2009/05/29.741."
2009 KL2JPL Sentry15122016-2108602.3e-08-4.24-4.550JPL: "Analysis based on 16 observations spanning .94458 days (2009-May-30.0495 to 2009-May-30.99408)." Diameter approximately 0.786 km. from mean, weighted H=18.2.

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 31 May '09

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

2032Grabbed MPEC 2009-K78 - 2009 KR21 - see above
1512Noted that NEODyS has posted 2009 KK8 as an impact risk - see above
Noted that JPL Sentry has posted 2009 KL2 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 KN4 risk assessment - see above
Noted that NEODyS has updated its 2009 KN4 risk assessment - see above
Grabbed MPEC 2009-K77 - Daily Orbit Update - see above