An image from this morning's Stardust 9P/Tempel 1 
encounter. Credit: NASA/JPL-Caltech/Cornell.

This is one of 72 images of the comet 9P/Tempel 1 nucleus from this morning's Stardust-NExT fly-by. Credit: NASA/JPL-Caltech/Cornell. For more images, a stereo pair and an animation, along with preliminary explanations, see the Planetary Society Blog.


Contents  on 15 February '11

Resources:

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 15 February '11

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. Of these, one was a "one nighter."

New MPECs  on 15 February '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 15 Feb. '11 >>  MPEC 2011-C96 - "07:11 UT" - Daily Orbit Update

Observers  on 15 February '11

Five observers appear in today's MPEC.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 55 in MPEC 2011-C96 -- 2011 CR1, 2011 CG2, 2011 BZ18, 2011 BY18, 2011 BX11, 2011 BX10, 2011 BP24, 2011 BK24, 2011 BC40, 2011 BB, 2011 BA12, 2011 BA, 2011 AO52, 2011 AO4, 2011 AL37, 2011 AG5, 2011 AF37, 2011 AC3, 2011 AA23, 2010 XY82, 2010 XO10, 2010 XC25, 2010 QE2, 2010 PR10, 2010 OQ1, 2009 DV42, 2008 BP16, 2007 EM88, 2007 CA27, 2006 VB14, 2005 GC120, 2003 YS117, 2003 TN1, 2003 MC7, 2001 DQ8, 2000 AZ93, 1999 TK12, 96590, 86324, 36284, 259802, 259221, 253841, 23183, 18882, 175706, 152563, 137052, 5496, 4954, 3838, 3554, 3288, 3122, 1981
J95Great Shefford Obs. in England, 1 in MPEC 2011-C96 -- 2011 CD66
130Lumezzane Obs. in Italy, 7 in MPEC 2011-C96 -- 2011 AM24, 2008 CM20, 2005 EE, 2001 DQ8, 48603, 162781, 152563
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2011-C96 -- 2004 BW58, 22771
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2011-C96 -- 2011 CQ4, 2011 CL50, 2011 CG22, 2011 CB50, 2011 BM24, 2011 AH37, 2011 AG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2011 CF66NEODyS22322024-2089459.3e-07-7.31-7.840NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-02-13.341 to 2011-02-13.518."
2011 CL50JPL Sentry18332036-2073453.5e-05-5.81-6.450JPL: "Analysis based on 19 observations spanning 2.7830 days (2011-Feb-12.46221 to 2011-Feb-15.24519)." Diameter approximately 0.010 km. from mean, weighted H=27.6.
NEODyS18332033-2090813.71e-05-5.83-6.390NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-02-12.463 to 2011-02-15.246."
2011 CB50JPL Sentry18332108-210922.7e-08-5.82-5.850JPL: "Analysis based on 22 observations spanning 4.0623 days (2011-Feb-10.48858 to 2011-Feb-14.5509)." Diameter approximately 0.241 km. from mean, weighted H=20.7.
NEODyS1833R E M O V E D-
2011 CQ4NEODyS1833R E M O V E D-
JPL Sentry1833R E M O V E DJPL: Risk listing removed at 1133 UTC.
2011 BA12JPL Sentry18332079-211032.2e-08-6.83-7.030JPL: "Analysis based on 149 observations spanning 19.122 days (2011-Jan-25.1938 to 2011-Feb-13.31567)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
2011 AG5NEODyS18332031-2058182.1e-04-2.16-2.221NEODyS: "Based on 116 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-02-15.198."
2010 XC25JPL Sentry18332050-205325.2e-06-3.18-3.200JPL: "Analysis based on 100 observations spanning 37.138 days (2010-Dec-08.37716 to 2011-Jan-14.51498)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
NEODyS18332050-206335.38e-06-3.18-3.20NEODyS: "Based on 102 optical observations (of which 2 are rejected as outliers) from 2010-12-08.378 to 2011-01-14.516."

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 15 February '11

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

2232Noted that NEODyS has posted 2011 CF66 as an impact risk - see above
1833Noted that JPL Sentry has updated its 2010 XC25 risk assessment - see above
Noted that NEODyS has updated its 2010 XC25 risk assessment - see above
Noted 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 CB50 risk assessment - see above
Noted that NEODyS has removed 2011 CB50 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 CL50 risk assessment - see above
Noted that NEODyS has updated its 2011 CL50 risk assessment - see above
Noted that JPL Sentry has removed 2011 CQ4 as an impact risk - see above
Noted that NEODyS has removed 2011 CQ4 as an impact risk - see above
Grabbed MPEC 2011-C96 - Daily Orbit Update - see above