Contents  on 8 August '11


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 8 August '11

The MPC's NEO Confirmation Page has 7 listings

When last checked at 2311 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of eighteen 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 8 August '11

Minor Planet Electronic Circulars

As of last check at 2311 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-P36 - "18:05 UT" - 2011 PU1

MPEC 2011-P35 - "16:33 UT" - 2011 PT1

<< DOU on 8 Aug. '11 >>  MPEC 2011-P34 - "06:05 UT" - Daily Orbit Update

Observers  on 8 August '11

Eleven observers appear in today's MPECs.

CodeObserver / observatory
7057Krisztian Sarneczky via Apache Point Obs. in New Mexico, 2 in MPEC 2011-P34 -- 2002 XP40, 2001 SK169
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-P36 -- 2011 PU1
I99Blanquita Obs. in Spain, 1 in MPEC 2011-P34 -- 2000 CP101
157Frasso Sabino Obs. in Italy, 2 in MPEC 2011-P34 -- 2011 PU, 2011 OQ5
J95Great Shefford Obs. in England, 2 in MPECs 2011-P34 & 2011-P36 -- 2011 PU1, 2011 OB26
704LINEAR in New Mexico, 5 in MPEC 2011-P34 -- 90075, 39572, 16960, 4183, 1943
J75La Sagra Obs. in Spain, 1 in MPEC 2011-P36 -- 2011 PU1
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-P36 -- 2011 PU1
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-P36 -- 2011 PU1
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2011-P34 & 2011-P35 -- 2011 PT1, 2011 OX17, 2009 QO5
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-P36 -- 2011 PU1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2101 and NEODyS at 2311 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 PU1JPL Sentry21012042-21112312.9e-04-3.89-4.630JPL: "Analysis based on 17 observations spanning 1.3103 days (2011-Aug-06.9677 to 2011-Aug-08.277994)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
2011 OB26JPL Sentry16102074-2109234.0e-05-4.94-5.410JPL: "Analysis based on 26 observations spanning 9.6359 days (2011-Jul-28.4734 to 2011-Aug-07.109334)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS16102090-209019.94e-09-8.44-8.440NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-07-28.474 to 2011-08-07.110."

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 8 August '11

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

2101Noted that JPL Sentry has posted 2011 PU1 as an impact risk - see above
1900Grabbed MPEC 2011-P36 - 2011 PU1 - see above
1708Grabbed MPEC 2011-P35 - 2011 PT1 - see above
1610Noted that JPL Sentry has updated its 2011 OB26 risk assessment - see above
Noted that NEODyS has updated its 2011 OB26 risk assessment - see above
Grabbed MPEC 2011-P34 - Daily Orbit Update - see above