Contents  on 14 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 14 August '11

The MPC's NEO Confirmation Page has 3 listings

When last checked at 2203 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three objects listed. Of these, two were "one nighters."

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 14 August '11

Minor Planet Electronic Circulars

As of last check at 2203 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-P55 - "21:55 UT" - PHAs

MPEC 2011-P54 - "21:55 UT" - Unusual Minor Planets

MPEC 2011-P53 - "21:55 UT" - Amors

MPEC 2011-P52 - "21:55 UT" - Atens and Apollos

MPEC 2011-P51 - "21:51 UT" - Observable Comets

<< DOU on 14 Aug. '11 >>  MPEC 2011-P50 - "06:16 UT" - Daily Orbit Update

Observers  on 14 August '11

Four observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2011-P50 -- 2011 PS, 2011 PO1, 2011 OY17, 2011 OW4, 2011 OV4, 2011 OE, 2011 OC18, 2011 NZ, 2011 MK, 2011 LC19, 2011 KN9, 2008 VH, 2008 RJ1, 2005 JA22
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-P50 -- 9400
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2011-P50 -- 101955
204Schiaparelli Obs. in Italy, 12 in MPEC 2011-P50 -- 2011 PS, 2011 PO1, 2011 PE2, 2011 OV18, 2011 OM5, 2011 GA62, 2009 OO9, 2009 CQ5, 2005 TR15, 2004 PX27, 2003 QC10, 2000 OM
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2203 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 Sentry16072027-205648.2e-05-2.79-2.840JPL: "Analysis based on 41 observations spanning 4.2321 days (2011-Aug-08.06387 to 2011-Aug-12.296012)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS16062027-205648.77e-05-2.78-2.840NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-12.297."

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 14 August '11

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

2203Grabbed MPEC 2011-P51 - Observable Comets - see above
Grabbed MPEC 2011-P52 - Atens and Apollos - see above
Grabbed MPEC 2011-P53 - Amors - see above
Grabbed MPEC 2011-P54 - Unusual Minor Planets - see above
Grabbed MPEC 2011-P55 - PHAs - see above
1606Noted 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-P50 - Daily Orbit Update - see above
0523Noted that the NEOCP has become active