Contents  on 5 July '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 July '09

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There was one listing noted earlier today.

New MPECs  on 5 July '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 5 July '09 >>  MPEC 2009-N11 - "06:07 UT" - Daily Orbit Update

Observers  on 5 July '09

Two observing facilities appear in today's MPEC.

CodeObserver / observatory
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2009-N11 -- 2009 NE, 2002 LV
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2009-N11 -- 2009 MG1, 2009 MB9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 July '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 MB9JPL Sentry15202031-208421.5e-08-4.47-4.480JPL: "Analysis based on 14 observations spanning 4.7795 days (2009-Jun-29.47208 to 2009-Jul-04.251543)." Diameter approximately 0.640 km. from mean, weighted H=18.6.
NEODyS15202031-204921.87e-08-4.13-4.130NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2009/06/29.473 to 2009/07/04.252."
2009 MG1JPL Sentry1520207918.9e-08-6.58-6.580JPL: "Analysis based on 20 observations spanning 11.101 days (2009-Jun-21.27223 to 2009-Jul-02.372809)." Diameter approximately 0.052 km. from mean, weighted H=24.1.
NEODyS1520207917.91e-08-6.63-6.630NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2009/06/21.273 to 2009/07/02.374."

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 July '09

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

1732Noted that the NEOCP has become empty
1520Noted that JPL Sentry has updated its 2009 MB9 risk assessment - see above
Noted that NEODyS has updated its 2009 MB9 risk assessment - see above
Noted that JPL Sentry has updated its 2009 MG1 risk assessment - see above
Noted that NEODyS has updated its 2009 MG1 risk assessment - see above
Grabbed MPEC 2009-N11 - Daily Orbit Update - see above
Noted that the NEOCP has become active