Contents  on 6 March '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 6 March '09

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

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings.

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

New MPECs  on 6 March '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 6 Mar. '09 >>  MPEC 2009-E41 - "07:12 UT" - Daily Orbit Update

Observers  on 6 March '09

Seven observing facilities appear in today's MPEC.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2009-E41 -- 2005 EF
J95Great Shefford Obs. in England, 6 in MPEC 2009-E41 -- 2009 EW, 2009 EM1, 2009 EK1, 2009 EH1, 2009 EE1, 2009 DD45
E16Grove Creek Obs. in New South Wales, 3 in MPEC 2009-E41 -- 2009 CC3, 2004 LE, 4954
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2009-E41 -- 2009 DR3
857Iowa Robotic Obs. in Arizona, 2 in MPEC 2009-E41 -- 2009 DV42, 2009 DL1
950.program code "." (23) via La Palma in the Canary Islands, 1 in MPEC 2009-E41 -- 2009 CW1
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-E41 -- 144332
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 March '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 EK1JPL Sentry15502020-2107242.5e-07-5.30-5.620JPL: "Analysis based on 19 observations spanning 3.6146 days (2009-Mar-02.34255 to 2009-Mar-05.95716)." Diameter approximately 0.151 km. from mean, weighted H=21.7.
NEODyS15502063-209051.62e-08-6.62-6.710NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2009/03/02.343 to 2009/03/05.958."
2009 EH1JPL Sentry15502060-209421.5e-09-10.34-10.60JPL: "Analysis based on 21 observations spanning 2.6511 days (2009-Mar-03.25773 to 2009-Mar-05.90881)." Diameter approximately 0.009 km. from mean, weighted H=27.9.
NEODyS1550204511.15e-09-10.22-10.220NEODyS: "Based on 22 optical observations (of which 1 are rejected as outliers) from 2009/03/03.258 to 2009/03/05.910."
2009 EE1JPL Sentry1550R E M O V E DJPL: Risk listing removed at 1215 UTC.
2009 EWJPL Sentry15502075-208141.6e-06-6.56-6.780JPL: "Analysis based on 45 observations spanning 3.7286 days (2009-Mar-02.29194 to 2009-Mar-06.020568)." Diameter approximately 0.018 km. from mean, weighted H=26.4.
NEODyS15502067-2089131.88e-06-6.50-6.720NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2009/03/02.293 to 2009/03/06.021."

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 6 March '09

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

1550Noted that JPL Sentry has removed 2009 EE1 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 EH1 risk assessment - see above
Noted that NEODyS has updated its 2009 EH1 risk assessment - see above
Noted that JPL Sentry has updated its 2009 EK1 risk assessment - see above
Noted that NEODyS has posted 2009 EK1 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 EW risk assessment - see above
Noted that NEODyS has updated its 2009 EW risk assessment - see above
Grabbed MPEC 2009-E41 - Daily Orbit Update - see above