Comet 103P/Hartley 2 viewed from EPOXI Deep Impact 
on 4 Nov. 2010. Credit: NASA/JPL/UM.

This past week the University of Maryland reported that the EPOXI Deep Impact spacecraft on November 4th passed through "a storm of fluffy particles of water ice being spewed out by carbon dioxide jets coming from the rough ends of [103P/Hartley 2, while] a different process was causing water vapor to come out of the comet's mid-section." For more info, see this, this, and also this. Image credit: NASA/JPL/UM.

Contents  on 20 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 20 November '10

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and one updated listing. Of these, one was a "one nighter." So far The Tracking News has counted a total of four listings on the NEOCP at some point 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 20 November '10

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 20 Nov. '10 >>  MPEC 2010-W15 - "07:12 UT" - Daily Orbit Update

Observers  on 20 November '10

Eight observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2010-W15 -- 2010 WJ, 2010 WH, 2010 WB, 2010 VZ139, 2010 VY190, 2010 VY139, 2010 VW194, 2010 VC140, 2010 TY54, 2010 TC55, 2010 SD13, 2010 NW117, 2010 LY63, 2007 VC138, 2002 VE68
448Desert Moon Obs. in New Mexico, 1 in MPEC 2010-W15 -- 2010 VZ71
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2010-W15 -- 2010 RN80
704LINEAR in New Mexico, 6 in MPEC 2010-W15 -- 2010 WJ, 2010 TM3, 2010 LO97, 1998 HG49, 18882, 111253
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-W15 -- 2010 VU
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2010-W15 -- 2010 VK139, 2010 VD72
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-W15 -- 2010 RF181
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2010-W15 -- 2010 SD13, 2010 NW117, 2010 LO97, 169352
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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
2010 VW194JPL Sentry16332042-2108224.4e-05-5.37-6.000JPL: "Analysis based on 21 observations spanning 4.0143 days (2010-Nov-15.34197 to 2010-Nov-19.35628)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS16332047-2089172.82e-05-5.51-5.950NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2010-11-15.343 to 2010-11-19.357."

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 20 November '10

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

1633Noted that JPL Sentry has updated its 2010 VW194 risk assessment - see above
Noted that NEODyS has updated its 2010 VW194 risk assessment - see above
Grabbed MPEC 2010-W15 - Daily Orbit Update - see above