Contents  on 12 April '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 12 April '11

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and four updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of seven listings on the NEOCP today.

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 12 April '11

Minor Planet Electronic Circulars

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

MPEC 2011-G73 - "14:11 UT" - 2010 FC49

MPEC 2011-G72 - "13:58 UT" - 2010 BL4

<< DOU on 12 Apr. '11 >>  MPEC 2011-G71 - "07:11 UT" - Daily Orbit Update

MPEC 2011-G70 - "04:45 UT" - 2011 GQ61

Observers  on 12 April '11

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2011-G71 -- 85953
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2011-G71 -- 85953
621Bergisch Gladbach Obs. in Germany, 2 in MPEC 2011-G71 -- 2011 GS60, 2009 CA2
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2011-G71 -- 2011 DL19, 89958, 267729, 159857, 136617
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2011-G71 -- 2011 GP59
J95Great Shefford Obs. in England, 5 in MPECs 2011-G70 & 2011-G71 -- 2011 GQ61, 2011 GP59, 2011 GF, 2011 GE, 2011 GD60
695.Larry Wasserman via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2011-G72 & 2011-G73 -- 2010 FC49, 2010 BL4
704LINEAR in New Mexico, 9 in MPEC 2011-G71 -- 2011 FS29, 85953, 37336, 264308, 24445, 169675, 138359, 11885, 6037
6885Larry Wasserman via Lowell Obs. Anderson Mesa Station in Arizona, 2 in MPECs 2011-G72 & 2011-G73 -- 2010 FC49, 2010 BL4
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2011-G71 -- 2011 GS60, 2011 GP59
A99Monte Baldo Obs. in Italy, 1 in MPEC 2011-G71 -- 2011 GP59
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-G70 & 2011-G71 -- 2011 GQ61, 2011 DL19
089Nikolaev Obs. in the Ukraine, 3 in MPEC 2011-G71 -- 2010 JO33, 2008 SV11, 2003 UV11
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2011-G71 -- 85953
H36Sandlot Obs. in Kansas, 2 in MPEC 2011-G71 -- 2011 GP59, 2011 GE
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2011-G71 -- 2011 GJ44, 2011 GH44, 2011 GH3, 2011 GE2, 2011 GD3, 2011 GC3, 2011 GA3, 2011 FR17, 2011 FC29, 1988 TA
A78Stia Obs. in Italy, 2 in MPEC 2011-G71 -- 2011 GR59, 4401
H47Vicksburg Obs. in Mississippi, 2 in MPEC 2011-G71 -- 85953, 22771
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 April '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 GS60JPL Sentry1557203011.8e-08-3.63-3.630JPL: "Analysis based on 24 observations spanning 3.0163 days (2011-Apr-08.40737 to 2011-Apr-11.42366)." Diameter approximately 0.660 km. from mean, weighted H=18.6.
NEODyS15572030-203121.8e-08-3.62-3.620NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-04-08.408 to 2011-04-11.424."

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 12 April '11

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

1557Noted that JPL Sentry has updated its 2011 GS60 risk assessment - see above
Noted that NEODyS has updated its 2011 GS60 risk assessment - see above
Grabbed MPEC 2011-G71 - Daily Orbit Update - see above
Grabbed MPEC 2011-G72 - 2010 BL4 - see above
Grabbed MPEC 2011-G73 - 2010 FC49 - see above
0509Grabbed MPEC 2011-G70 - 2011 GQ61 - see above