Contents  on 18 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 18 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.

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 18 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 18 Aug. '11 >>  MPEC 2011-Q03 - "06:02 UT" - Daily Orbit Update

Observers  on 18 August '11

Six observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2011-Q03 -- 2011 PS, 2011 PO1, 2011 PE2, 2011 OY17, 2011 OW4, 2011 OP24, 2011 OM5, 2011 OJ10, 2011 OE, 2011 MO4, 2011 LX10, 2011 AO52, 2003 QC10
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2011-Q03 -- 2000 CP101
I99Blanquita Obs. in Spain, 1 in MPEC 2011-Q03 -- 2011 GA55
203GiaGa Obs. in Italy, 5 in MPEC 2011-Q03 -- 2011 OY17, 2011 OV4, 2011 NZ, 2000 CP101, 280136
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-Q03 -- 2000 SJ344
H36Sandlot Obs. in Kansas, 2 in MPEC 2011-Q03 -- 2011 PS, 2011 PO1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 Sentry16072027-205638.2e-05-2.79-2.840JPL: "Analysis based on 46 observations spanning 9.1768 days (2011-Aug-08.06387 to 2011-Aug-17.240692)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS16072027-209058.69e-05-2.77-2.840NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-17.241."

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 18 August '11

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

1607Noted 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-Q03 - Daily Orbit Update - see above