Contents  on 9 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 9 March '11

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and five updated listings. Of these, two were "one nighters."

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 9 March '11

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 9 Mar. '11 >>  MPEC 2011-E47 - "07:14 UT" - Daily Orbit Update

Observers  on 9 March '11

A total of 21 observers appear in today's MPEC.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 4 in MPEC 2011-E47 -- 2011 EX4, 2011 ET4, 2011 EE17, 2011 EB12
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2011-E47 -- 2011 CH50, 2011 CG2, 2010 XZ67
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-E47 -- 2011 EU20
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2011-E47 -- 2011 EE17
160Castelmartini Obs. in Italy, 4 in MPEC 2011-E47 -- 2007 EX, 96590, 18882, 164400
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2011-E47 -- 2002 TD60, 2002 SZ, 2001 VK5, 18882, 11405
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-E47 -- 2011 AO52
203GiaGa Obs. in Italy, 5 in MPEC 2011-E47 -- 2011 ET4, 2011 EE17, 2011 DS9, 2011 BO59, 36284
B83Gieres Obs. in France, 1 in MPEC 2011-E47 -- 36284
J95Great Shefford Obs. in England, 2 in MPEC 2011-E47 -- 2011 EY11, 2011 EC12
B86Hagen Obs. in Germany, 1 in MPEC 2011-E47 -- 2011 EU20
704LINEAR in New Mexico, 7 in MPEC 2011-E47 -- 2010 UX7, 2004 FU4, 263976, 234341, 144332, 7480, 4954
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-E47 -- 2011 CP4
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2011-E47 -- 2011 BO59, 2010 PR10, 2009 FY4, 159467
A13Naef Obs. in Switzerland, 2 in MPEC 2011-E47 -- 2011 DU, 2002 SZ
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2011-E47 -- 2011 CY46, 40267, 36284
510Siegen Obs. in Germany, 1 in MPEC 2011-E47 -- 2011 EU20
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2011-E47 -- 2011 EB7, 2011 DY4, 2011 DV, 2011 DU, 2011 DS9, 2011 CX46, 2011 BN59, 2010 XY82, 2008 EM9, 2001 AD2
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-E47 -- 2011 EU20
A48Verona Obs. in Italy, 4 in MPEC 2011-E47 -- 2011 CY46, 2011 BO59, 2009 FY4, 2004 EM20
C44Volta Obs., 2 in MPEC 2011-E47 -- 2011 EU20, 2011 EB12
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 DS9NEODyS1652R E M O V E D-
2011 DVJPL Sentry16522063-2110447.9e-06-3.36-4.180JPL: "Analysis based on 54 observations spanning 13.945 days (2011-Feb-22.51614 to 2011-Mar-08.46141)." Diameter approximately 0.271 km. from mean, weighted H=20.5.
NEODyS16522063-209052.93e-07-4.68-5.080NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-08.462."

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 9 March '11

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

1652Noted that NEODyS has removed 2011 DS9 as an impact risk - see above
Noted 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-E47 - Daily Orbit Update - see above
0239Noted that the NEOCP has become active