Contents  on 11 September '11


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 11 September '11

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2311 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of two listings on the NEOCP today.

New MPECs  on 11 September '11

Minor Planet Electronic Circulars

As of last check at 2311 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 11 Sept. '11 >>  MPEC 2011-R40 - "06:07 UT" - Daily Orbit Update

Observers  on 11 September '11

Seven observers appear in today's MPEC.

CodeObserver / observatory
I08Alianza S4 Obs. in Argentina, 1 in MPEC 2011-R40 -- 2011 RJ1
I99Blanquita Obs. in Spain, 2 in MPEC 2011-R40 -- 2011 OV4, 283460
160Castelmartini Obs. in Italy, 3 in MPEC 2011-R40 -- 2011 LJ19, 2011 HD63, 138524
J95Great Shefford Obs. in England, 1 in MPEC 2011-R40 -- 2011 LC19
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2011-R40 -- 2011 MO4, 138524
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2011-R40 -- 1993 FS
204Schiaparelli Obs. in Italy, 15 in MPEC 2011-R40 -- 2011 QY39, 2011 QS49, 2011 QE48, 2011 PT1, 2011 OQ5, 2011 MO4, 2011 LJ19, 2011 KN9, 2011 HD63, 2011 GA55, 2008 RJ1, 2008 RG1, 2004 PX27, 2003 QC10, 2000 SH8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 September '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2311 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. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON risk pages.





Notes for Today's Latest Risk Assessments
2008 EM68JPL Sentry03092011-21109671.5e-05-5.29-5.750JPL: "Analysis based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

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 11 September '11

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

1546Grabbed MPEC 2011-R40 - Daily Orbit Update - see above
0309Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above