Contents  on 10 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 10 February '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, five were "one nighters." So far The Tracking News has counted a total of nineteen 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 10 February '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.

<< DOU on 10 Feb. '11 >>  MPEC 2011-C66 - "07:10 UT" - Daily Orbit Update

MPEC 2011-C65 - "00:13 UT" - 2011 CL33

MPEC 2011-C64 - "00:09 UT" - 2011 CK33

MPEC 2011-C63 - "00:05 UT" - 2011 CJ33

Observers  on 10 February '11

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2011-C66 -- 2011 CZ3, 2011 CY3, 2011 BX10, 2011 BR15, 2011 BL24, 2011 BJ24, 2010 TH19
B75Betelgeuse Station in Italy, 1 in MPEC 2011-C66 -- 2011 CG2
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2011-C64 & 2011-C66 -- 2011 CK33, 2010 XP51, 2010 LF86, 253841, 22771, 7480
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2011-C66 -- 2011 CG2, 2011 AN16
151Eschenberg Obs. in Switzerland, 2 in MPEC 2011-C66 -- 2011 CG2, 2003 YS117
651Grasslands Obs. in Arizona, 1 in MPEC 2011-C63 -- 2011 CJ33
J28Jaen Obs. in Spain, 2 in MPEC 2011-C66 -- 2011 CG2, 3122
046Klet Obs. in the Czech Republic, 6 in MPEC 2011-C66 -- 2011 CG2, 2011 BX10, 2011 AN16, 2011 AF37, 2010 WQ7, 85990
560Madonna di Dossobuono Obs. in Italy, 3 in MPEC 2011-C66 -- 2011 CG2, 2011 BA12, 2005 GW119
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-C63, 2011-C64, 2011-C65 & 2011-C66 -- 2011 CL33, 2011 CK33, 2011 CJ33, 2010 YB, 2000 CR101, 162781, 5189
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-C66 -- 2011 CS4, 2003 GY, 9856
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-C66 -- 2011 CZ3
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2011-C63, 2011-C64 & 2011-C66 -- 2011 CX7, 2011 CU4, 2011 CT4, 2011 CS4, 2011 CK33, 2011 CJ33, 2011 BV15, 2011 BL45, 2011 BG59, 2011 BD40, 2010 VZ, 1999 NA5
A48Verona Obs. in Italy, 1 in MPEC 2011-C66 -- 2011 CG2
C51WISE in Earth polar orbit, 18 in MPEC 2011-C66 -- 90367, 89959, 86326, 85628, 36183, 220124, 218017, 163691, 162998, 162566, 159686, 153219, 152941, 10115, 7822, 5604, 4015, 2212
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 CX7NEODyS1600R E M O V E D-
JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1050 UTC.
2011 CT4JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1056 UTC.
2011 BL45JPL Sentry16002050-2089292.1e-04-4.92-5.350JPL: "Analysis based on 16 observations spanning 10.033 days (2011-Jan-30.34391 to 2011-Feb-09.37643)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS16002050-2090273.05e-04-4.60-5.010NEODyS: "Based on 17 optical observations (of which 1 are rejected as outliers) from 2011-01-30.345 to 2011-02-09.377."
2011 BA12JPL Sentry16002079-211054.4e-07-5.51-5.970JPL: "Analysis based on 114 observations spanning 15.763 days (2011-Jan-25.1938 to 2011-Feb-09.95635)." Diameter approximately 0.099 km. from mean, weighted H=22.7.

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 10 February '11

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

1600Noted 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 removed 2011 CT4 as an impact risk - see above
Noted that JPL Sentry has removed 2011 CX7 as an impact risk - see above
Noted that NEODyS has removed 2011 CX7 as an impact risk - see above
Grabbed MPEC 2011-C66 - Daily Orbit Update - see above
0028Grabbed MPEC 2011-C63 - 2011 CJ33 - see above
Grabbed MPEC 2011-C64 - 2011 CK33 - see above
Grabbed MPEC 2011-C65 - 2011 CL33 - see above