Artist rendition of Stardust encountering 
comet 9P/Tempel 1 next year. Credit: NASA/JPL.

NASA/JPL announced yesterday that the Stardust-NExT spacecraft fired its thrusters briefly on November 20th to adjust its flight path on the way to a February 14th rendezvous with 9P/Tempel 1 next year. This will be the second comet flyby in four months and the first-ever return visit to a small Solar-System body. Artistic rendition credit: NASA/JPL.

Contents  on 23 November '10


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 23 November '10

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2359 UTC). It was last noted active on November 21st.

New MPECs  on 23 November '10

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.

MPEC 2010-W20 - "21:56 UT" - Comet C/2010 KW7 (WISE)

<< DOU on 23 Nov. '10 >>  MPEC 2010-W19 - "07:13 UT" - Daily Orbit Update

Observers  on 23 November '10

Six observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2010-W19 -- 2010 VZ11, 2010 VT11, 2010 VR, 2010 VQ21, 2010 VP21, 2010 VE, 2010 VB, 2010 UX7, 2010 UX6, 2010 UM, 2010 TF54, 2010 RT80, 2010 RN80, 2010 RK43, 2002 VE68
703Catalina Sky Survey in Arizona, 1 in MPEC 2010-W19 -- 2003 YT124
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2010-W19 -- 2003 YT124
204Schiaparelli Obs. in Italy, 3 in MPEC 2010-W19 -- 2010 VN98, 2008 EL, 2001 TX44
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-W20 -- C/2010 KW7
926Tenagra II Obs. in Arizona, 16 in MPEC 2010-W19 -- 2010 JK41, 2009 XC2, 2009 VO24, 2009 UV18, 2009 NE, 2006 HR29, 2006 CX10, 2005 NP1, 2003 MJ4, 85818, 243298, 242216, 241596, 152671, 152558, 6050
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 November '10

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
2009 FDJPL Sentry18022185-219642.5e-03-1.66-1.69-JPL: "Analysis based on 175 observations spanning 626.44 days (2009-Feb-24.36493 to 2010-Nov-12.80566)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
NEODyS16212185-219672.44e-03-1.67-1.69-NEODyS: "Based on 179 optical observations (of which 5 are rejected as outliers) from 2009-02-24.366 to 2010-11-12.806."

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 23 November '10

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

2316Grabbed MPEC 2010-W20 - Comet C/2010 KW7 (WISE) - see above
1802Noted that JPL Sentry has posted 2009 FD as an impact risk - see above
1621Noted that NEODyS has posted 2009 FD as an impact risk - see above
Grabbed MPEC 2010-W19 - Daily Orbit Update - see above