Contents  on 9 August '11


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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 9 August '11

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of eight 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 9 August '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-P41 - "17:26 UT" - 2011 PF2

MPEC 2011-P40 - "11:41 UT" - 2011 PE2

MPEC 2011-P39 - "11:39 UT" - 2011 PC2

<< DOU on 9 Aug. '11 >>  MPEC 2011-P38 - "06:05 UT" - Daily Orbit Update

MPEC 2011-P37 - "01:18 UT" - Comet 213P-B/Van Ness

Observers  on 9 August '11

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2011-P38 -- 2011 PO1, 2011 OY17, 2011 OD18, 2011 NZ, 2011 MT, 2011 KN9, 2006 RG7, 2005 BY1
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-P37 -- 213P-B
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-P37 -- 213P-B
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-P39 -- 2011 PC2
372Geisei Obs. in Japan, 1 in MPEC 2011-P37 -- 213P-B
J95Great Shefford Obs. in England, 1 in MPEC 2011-P40 -- 2011 PE2
704LINEAR in New Mexico, 1 in MPEC 2011-P38 -- 433
J75La Sagra Obs. in Spain, 1 in MPEC 2011-P40 -- 2011 PE2
C10Maisoncelles Obs. in France, 1 in MPEC 2011-P37 -- 213P-B
557Ondrejov Obs. in the Czech Republic, 2 in MPEC 2011-P38 -- 2011 EZ78, 3103
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-P39 -- 2011 PC2
941Pla D'Arguines Obs. in Spain, 1 in MPEC 2011-P37 -- 213P-B
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-P37 -- 213P-B
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-P37 -- 213P-B
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-P40 -- 2011 PE2
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-P41 -- 2011 PF2
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-P40 -- 2011 PE2
B51Vallauris Obs. in France, 1 in MPEC 2011-P37 -- 213P-B
718Wiggins Obs. in Utah, 1 in MPEC 2011-P40 -- 2011 PE2
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2011-P38 -- 3988
C42Xingming Obs. in China, 1 in MPEC 2011-P37 -- 213P-B
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 August '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 risk pages.





Notes for Today's Latest Risk Assessments
2011 PE2JPL Sentry17372027-2105173.6e-05-3.12-3.180JPL: "Analysis based on 19 observations spanning 1.2227 days (2011-Aug-08.06387 to 2011-Aug-09.286547)." Diameter approximately 0.087 km. from mean, weighted H=22.9.
2011 PU1NEODyS16222046-20902062.51e-04-3.93-4.810NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-08-06.968 to 2011-08-08.279."
2011 PO1JPL Sentry1737R E M O V E DJPL: Risk listing removed at 0849 UTC.

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 9 August '11

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

2305Noted that the NEOCP has become active
1836Noted that the NEOCP has become empty
1737Noted that JPL Sentry has posted 2011 PE2 as an impact risk - see above
Noted that JPL Sentry has removed 2011 PO1 as an impact risk - see above
1729Grabbed MPEC 2011-P41 - 2011 PF2 - see above
1622Noted that NEODyS has posted 2011 PU1 as an impact risk - see above
Grabbed MPEC 2011-P38 - Daily Orbit Update - see above
Grabbed MPEC 2011-P39 - 2011 PC2 - see above
Grabbed MPEC 2011-P40 - 2011 PE2 - see above
0146Grabbed MPEC 2011-P37 - Comet 213P-B/Van Ness - see above