Contents  on 8 March '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 8 March '11

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were five listings noted earlier today.

New MPECs  on 8 March '11

Minor Planet Electronic Circulars

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

MPEC 2011-E46 - "22:26 UT" - 2011 EU20

MPEC 2011-E45 - "22:20 UT" - 2011 ET20

<< DOU on 8 Mar. '11 >>  MPEC 2011-E44 - "07:18 UT" - Daily Orbit Update

Observers  on 8 March '11

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2011-E44 -- 2011 DV, 2011 CY46, 2011 AO52
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-E44 & 2011-E46 -- 2011 EU20, 2011 EL17
B60Deep Sky Obs. in Germany, 1 in MPEC 2011-E44 -- 96590
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2011-E44 & 2011-E46 -- 2011 EU20, 2011 CH71
157Frasso Sabino Obs. in Italy, 1 in MPEC 2011-E44 -- 2010 UX7
B21Gaisberg Obs. in Austria, 1 in MPEC 2011-E46 -- 2011 EU20
J95Great Shefford Obs. in England, 6 in MPECs 2011-E44 & 2011-E45 -- 2011 EY11, 2011 ET20, 2011 EL17, 2011 EG17, 2011 ED12, 2011 EC12
A17Guidestar Obs. in Germany, 4 in MPECs 2011-E44 & 2011-E46 -- 2011 EX4, 2011 EU20, 2011 ED12, 2011 EB12
B86Hagen Obs. in Germany, 1 in MPEC 2011-E44 -- 2011 EC12
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2011-E44 -- 2011 CH71, 2011 BO59, 1999 TK12
E17Leura Obs. in New South Wales, 1 in MPEC 2011-E44 -- 36284
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-E45 -- 2011 ET20
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2011-E44 -- 2011 CR4, 2011 BA45
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-E44 -- 2005 ES70
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-E45 & 2011-E46 -- 2011 EU20, 2011 ET20
J93Mt. Tuffley Obs. in England, 3 in MPEC 2011-E44 -- 36284, 4954, 3554
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2011-E44 -- 2009 FY4, 2002 SZ, 68350
204Schiaparelli Obs. in Italy, 5 in MPEC 2011-E44 -- 2011 DV, 2011 DU, 2011 DD5, 2007 MR, 2001 CA32
A55Vallemare di Borbona Obs. in Italy, 1 in MPEC 2011-E44 -- 2011 EE17
C44Volta Obs., 1 in MPEC 2011-E44 -- 2011 ED12
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 March '11

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. 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 (backup) risk pages.





Notes for Today's Latest Risk Assessments
2011 DVJPL Sentry17172063-2110491.2e-05-3.12-3.830JPL: "Analysis based on 51 observations spanning 12.003 days (2011-Feb-22.51614 to 2011-Mar-06.51917)." Diameter approximately 0.272 km. from mean, weighted H=20.5.
NEODyS17172063-209062.63e-06-3.70-3.970NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-06.520."

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 8 March '11

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

2238Grabbed MPEC 2011-E45 - 2011 ET20 - see above
Grabbed MPEC 2011-E46 - 2011 EU20 - see above
Noted that the NEOCP has become empty
1717Noted that JPL Sentry has updated its 2011 DV risk assessment - see above
Noted that NEODyS has updated its 2011 DV risk assessment - see above
Grabbed MPEC 2011-E44 - Daily Orbit Update - see above