Contents  on 17 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.

Radar Astrometry  on 17 August '11

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2359 UTC when the database was dated 17 Aug.

NEOCP Activity  on 17 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.

New MPECs  on 17 August '11

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 17 Aug. '11 >>  MPEC 2011-Q02 - "06:02 UT" - Daily Orbit Update

Observers  on 17 August '11

Eleven observers appear in today's MPEC.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-Q02 -- 284114
251Arecibo in Puerto Rico, 1 in radar -- 85774
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPEC 2011-Q02 -- 2011 PO1, 2011 PE2, 2011 OY17, 2011 OV4, 2011 OM5, 2011 NZ, 2011 MV1, 2011 MT, 2011 MO4, 2011 GA55, 2011 DL19, 2009 QZ6, 2009 AV, 2008 VH, 2008 SR7, 2008 SO, 2008 RJ1, 2008 JO, 2006 WP127, 2006 SC6, 2004 PX27, 2001 BZ39, 54789, 159608
160Castelmartini Obs. in Italy, 1 in MPEC 2011-Q02 -- 2011 OY17
B92Chinon Obs. in France, 1 in MPEC 2011-Q02 -- 1036
A13Naef Obs. in Switzerland, 2 in MPEC 2011-Q02 -- 3988, 1036
A24New Millennium Obs. in Italy, 3 in MPEC 2011-Q02 -- 37336, 3988, 1917
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2011-Q02 -- 48603, 175189
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2011-Q02 -- 2011 JA8, 2011 GA55, 2000 CP101
B38Santa Mama Obs. in Italy, 3 in MPEC 2011-Q02 -- 37336, 20086, 1865
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-Q02 -- 2011 PO1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 Sentry17152027-210358.4e-05-2.78-2.830JPL: "Analysis based on 43 observations spanning 8.1808 days (2011-Aug-08.06387 to 2011-Aug-16.24472)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS17152027-205649.49e-05-2.73-2.790NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-16.245."

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 17 August '11

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

2359Noted Radar Astrometry database update - see above
1715Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Grabbed MPEC 2011-Q02 - Daily Orbit Update - see above