Contents  on 1 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 1 August '11

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 36 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 1 August '11

Minor Planet Electronic Circulars

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

MPEC 2011-P02 - "11:43 UT" - 2011 OV18

<< DOU on 1 Aug. '11 >>  MPEC 2011-P01 - "06:06 UT" - Daily Orbit Update

Observers  on 1 August '11

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-P01 & 2011-P02 -- 2011 OY17, 2011 OW4, 2011 OV18
157Frasso Sabino Obs. in Italy, 6 in MPEC 2011-P01 -- 2011 OQ5, 2011 NY, 2011 MT, 2011 MK, 2011 LX10, 2005 JA22
A17Guidestar Obs. in Germany, 1 in MPEC 2011-P01 -- 2011 MO4
704LINEAR in New Mexico, 3 in MPEC 2011-P01 -- 174050, 5143, 1943
J59Linceo Obs. in Spain, 1 in MPEC 2011-P01 -- 3288
D33MPC code D33, 3 in MPEC 2011-P01 -- 7358, 3288, 1036
A13Naef Obs. in Switzerland, 2 in MPEC 2011-P01 -- 2011 OY17, 138524
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2011-P01 & 2011-P02 -- 2011 OV18, 2011 OE16, 2001 MQ3
H23Pear Tree Obs. in Florida, 1 in MPEC 2011-P01 -- 2011 OV4
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-P01 -- 68031
204Schiaparelli Obs. in Italy, 6 in MPEC 2011-P01 -- 2011 MV1, 2011 LX10, 2008 TR10, 2003 MT9, 2000 CP101, 68031
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2011-P01 -- 2011 OX17, 2008 QF, 54071
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-P02 -- 2011 OV18
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 OD18NEODyS17052034-208071.71e-07-7.50-7.990NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2011-07-31.058 to 2011-07-31.152."

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 1 August '11

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

1500Noted that NEODyS has posted 2011 OD18 as an impact risk - see above
Grabbed MPEC 2011-P01 - Daily Orbit Update - see above
Grabbed MPEC 2011-P02 - 2011 OV18 - see above