Contents  on 11 February '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 February '11

The MPC's NEO Confirmation Page has 9 listings: 1 new, 8 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and eight updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of thirteen 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 11 February '11

Minor Planet Electronic Circulars

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

<< DOU on 11 Feb. '11 >>  MPEC 2011-C68 - "07:10 UT" - Daily Orbit Update

MPEC 2011-C67 - "06:23 UT" - 2011 CG42

Observers  on 11 February '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2011-C68 -- 2011 CY6, 2011 CP4, 2011 CA4, 2011 BY18, 2011 BX10, 2011 BU10, 2011 BR15, 2011 BF39, 2011 BC40, 2011 BB19, 2011 BA12, 2011 AO52, 2011 AG5, 2011 AA23, 2010 VZ
127Bornheim Obs. in Germany, 2 in MPEC 2011-C68 -- 96590, 3122
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2011-C68 -- 2011 BR15, 2010 XY82, 2009 CN5, 2008 CM20, 85990, 244977, 163081, 159609, 137084, 5869, 4954, 3199
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2011-C68 -- 2003 MC7, 40267
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2011-C68 -- 2010 XY72
F655David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 3 in MPEC 2011-C68 -- 2011 CH33, 2011 BB, 2011 AS26
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-C68 -- 4957
J28Jaen Obs. in Spain, 3 in MPEC 2011-C68 -- 259802, 175706, 1864
704LINEAR in New Mexico, 7 in MPEC 2011-C68 -- 2011 BA12, 2005 GW119, 85275, 48603, 36284, 175706, 162781
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-C67 -- 2011 CG42
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2011-C67 & 2011-C68 -- 2011 CG42, 2010 LR68, 2000 QN130, 68278, 36284, 18882, 175706, 175189, 153958, 6037
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2011-C68 -- 2011 CP4, 2011 CG2, 2011 BM45, 2011 BB45, 2011 BA12, 2011 AF37, 2010 GR7
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-C67 -- 2011 CG42
H36Sandlot Obs. in Kansas, 5 in MPEC 2011-C68 -- 2011 CY7, 2011 CO14, 2011 BB19, 2003 CA, 2000 EY106
204Schiaparelli Obs. in Italy, 9 in MPEC 2011-C68 -- 2011 CH33, 2011 BZ18, 2011 BY18, 2011 BV11, 2011 BK24, 2011 BJ24, 2011 BF39, 2011 BC40, 2011 BA12
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-C68 -- 2011 BR15
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2011-C68 -- 2011 CX7, 2011 BY18, 2011 BL45, 2011 AR26, 2010 XZ72, 2010 XL69, 2010 SR3, 2010 SA12
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 February '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 BM45JPL Sentry16412078-2108112.7e-05-2.72-2.750JPL: "Analysis based on 34 observations spanning 9.8081 days (2011-Jan-30.4027 to 2011-Feb-09.21079)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
NEODyS16412076-209092.49e-05-2.64-2.670NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-09.212."
2011 BL45JPL Sentry16412050-2083192.5e-04-4.86-5.250JPL: "Analysis based on 19 observations spanning 11.048 days (2011-Jan-30.34391 to 2011-Feb-10.39196)." Diameter approximately 0.013 km. from mean, weighted H=27.2.
NEODyS16412050-2090293.1e-04-4.67-5.070NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2011-01-30.345 to 2011-02-10.393."
2011 BA12JPL Sentry16412079-211042.0e-07-5.86-6.280JPL: "Analysis based on 130 observations spanning 16.157 days (2011-Jan-25.1938 to 2011-Feb-10.350745)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
2011 AG5NEODyS16412036-2058131.86e-04-2.20-2.371NEODyS: "Based on 103 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-02-10.071."

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 February '11

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

1641Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BA12 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BL45 risk assessment - see above
Noted that NEODyS has updated its 2011 BL45 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BM45 risk assessment - see above
Noted that NEODyS has updated its 2011 BM45 risk assessment - see above
Grabbed MPEC 2011-C68 - Daily Orbit Update - see above
0630Grabbed MPEC 2011-C67 - 2011 CG42 - see above