Brian Marsden, former MPC Director. 
Credit Harold Dorwin, courtesy of CfA.

First word came in Minor Planet Electronic Circular 2010-W10 yesterday. Brian Marsden had passed on that morning at age 73. By A/CC's count it was the 20,691st MPEC issued since the first, signed by himself in 1993, one of many innovations from his time as Director of the IAU Minor Planet Center. The Harvard-Smithsonian Center for Astrophysics reports there was a long illness; but in retirement Dr. Marsden stayed involved, posting a batch of comet MPECs only nine days ago. More: MPML, C-ML, TPS, MB, S&T, BA, GK, NS, and a 2003 article. Image credit: Harold Dorwin/CfA.

Contents  on 19 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 19 November '10

The MPC's NEO Confirmation Page has 3 listings: 2 new, 1 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and one updated listings. All of these were "one nighters." So far The Tracking News has counted a total of six 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 19 November '10

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 19 Nov. '10 >>  MPEC 2010-W14 - "07:12 UT" - Daily Orbit Update

MPEC 2010-W13 - "04:21 UT" - 2010 RF181

MPEC 2010-W12 - "02:53 UT" - 2010 WJ

MPEC 2010-W11 - "02:42 UT" - 2010 WH

Observers  on 19 November '10

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPEC 2010-W14 -- 2010 VZ71, 2010 VY71, 2010 VY139, 2010 VX139, 2010 VW98, 2010 VV98, 2010 VV21, 2010 VT11, 2010 VQ98, 2010 VN98, 2010 VK139, 2010 VD139, 2010 VC140, 2010 UX6, 2010 UE7, 2010 UD, 2010 PL9, 2010 LR68, 2005 TB15, 2004 QT24
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2010-W14 -- 2010 VZ139, 2010 VQ21
448Desert Moon Obs. in New Mexico, 7 in MPEC 2010-W14 -- 2010 VZ11, 2010 VL1, 2010 LO97, 2007 EM88, 88959, 189011, 17181
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2010-W14 -- 2010 SC41, 2002 VE68, 100926, 5869
511Haute Provence Obs. in Germany, 3 in MPECs 2010-W11, 2010-W12 & 2010-W13 -- 2010 WJ, 2010 WH, 2010 RF181
704LINEAR in New Mexico, 10 in MPECs 2010-W11, 2010-W12, 2010-W13 & 2010-W14 -- 2010 WJ, 2010 WH, 2010 VZ139, 2010 VY190, 2010 TM3, 2010 RF181, 2010 LO97, 2010 LF86, 2006 VB14, 1998 HG49
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPEC 2010-W14 -- 2010 VW194, 2010 VQ98, 2010 UE51
900Moriyama Obs. in Japan, 1 in MPEC 2010-W11 -- 2010 WH
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2010-W14 -- 2010 QD2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2010-W14 -- 2010 WB
J41Raheny Obs. in Ireland, 2 in MPECs 2010-W11 & 2010-W12 -- 2010 WJ, 2010 WH
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPECs 2010-W13 & 2010-W14 -- 2010 WB, 2010 VB99, 2010 RF181, 2010 OQ1, 241662
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2010-W14 -- 2010 RA147
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2010-W14 -- 2010 VX39, 2010 VU98, 2010 UT7, 2010 TM4, 2010 OC101, 2006 KA40, 2004 BV1
B18Terskol Obs. in Russia, 3 in MPECs 2010-W11, 2010-W12 & 2010-W13 -- 2010 WJ, 2010 WH, 2010 RF181
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-W12 -- 2010 WJ
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 Sentry16322042-2108284.6e-05-5.33-5.950JPL: "Analysis based on 18 observations spanning 2.9625 days (2010-Nov-15.34197 to 2010-Nov-18.30451)." Diameter approximately 0.018 km. from mean, weighted H=26.4.
NEODyS16322047-2089122.8e-05-5.48-5.910NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2010-11-15.343 to 2010-11-18.305."
2010 VC140JPL Sentry1632R E M O V E DJPL: Risk listing removed at 1134 UTC.
NEODyS1632R E M O V E D-
2010 VQ98JPL Sentry16322100-210841.5e-05-6.88-7.190JPL: "Analysis based on 38 observations spanning 7.9622 days (2010-Nov-10.43786 to 2010-Nov-18.40006)." Diameter approximately 0.008 km. from mean, weighted H=28.2.
2010 UE51JPL Sentry16322075-207841.7e-04-5.74-6.180JPL: "Analysis based on 156 observations spanning 20.060 days (2010-Oct-29.25716 to 2010-Nov-18.31734)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
NEODyS16322074-207871.34e-04-5.86-6.190NEODyS: "Based on 160 optical observations (of which 4 are rejected as outliers) from 2010-10-29.258 to 2010-11-18.318."

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 19 November '10

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

1632Noted that JPL Sentry has updated its 2010 UE51 risk assessment - see above
Noted that NEODyS has updated its 2010 UE51 risk assessment - see above
Noted that JPL Sentry has removed 2010 VC140 as an impact risk - see above
Noted that NEODyS has removed 2010 VC140 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 VQ98 risk assessment - see above
Noted 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-W14 - Daily Orbit Update - see above
0707Grabbed MPEC 2010-W13 - 2010 RF181 - see above
0300Grabbed MPEC 2010-W11 - 2010 WH - see above
Grabbed MPEC 2010-W12 - 2010 WJ - see above