Contents  on 24 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 24 August '11

The MPC's NEO Confirmation Page has 47 listings

When last checked at 2304 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 47 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 52 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 24 August '11

Minor Planet Electronic Circulars

As of last check at 2304 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-Q21 - "18:25 UT" - 2011 QG9

<< DOU on 24 Aug. '11 >>  MPEC 2011-Q20 - "06:03 UT" - Daily Orbit Update

MPEC 2011-Q19 - "01:05 UT" - 2010 XC11

MPEC 2011-Q18 - "01:02 UT" - 2007 FK1

Observers  on 24 August '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2011-Q18, 2011-Q19, 2011-Q20 & 2011-Q21 -- 2011 QG9, 2011 PS, 2011 PE2, 2011 OK5, 2011 MD5, 2010 XC11, 2007 FK1
160Castelmartini Obs. in Italy, 4 in MPEC 2011-Q20 -- 2011 QS2, 2011 PF2, 2011 OY17, 2000 CP101
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2011-Q20 -- 2011 OB, 2011 KF4
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-Q21 -- 2011 QG9
196Homburg-Erbach Obs. in Germany, 3 in MPEC 2011-Q20 -- 2011 OV4, 2011 NZ, 138524
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-Q20 -- 190208
704LINEAR in New Mexico, 8 in MPECs 2011-Q20 & 2011-Q21 -- 2011 QG9, 2011 OY17, 2011 OV4, 2011 OQ5, 2008 QF, 2005 TR15, 284114, 3288
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-Q20 -- 1997 QK1
C27Pallerols Obs. in Spain, 3 in MPEC 2011-Q20 -- 253841, 190208, 3288
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-Q20 & 2011-Q21 -- 2011 QG9, 2008 QF
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-Q21 -- 2011 QG9
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-Q21 -- 2011 QG9
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-Q20 -- 2011 QX8
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2011-Q20 -- 2004 FF29, 25330, 10145
A78Stia Obs. in Italy, 3 in MPEC 2011-Q20 -- 283460, 274855, 3988
G56Walnut Creek Obs. in northern California, 2 in MPEC 2011-Q20 -- 2011 OV4, 2006 SV134
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2304 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 Sentry15372027-210361.6e-04-2.46-2.500JPL: "Analysis based on 59 observations spanning 15.313 days (2011-Aug-08.06387 to 2011-Aug-23.377162)." Diameter approximately 0.085 km. from mean, weighted H=23.0.
NEODyS15372027-209052.04e-04-2.35-2.370NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-23.378."

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 24 August '11

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

1826Grabbed MPEC 2011-Q21 - 2011 QG9 - see above
1537Noted 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-Q20 - Daily Orbit Update - see above
0512Grabbed MPEC 2011-Q18 - 2007 FK1 - see above
Grabbed MPEC 2011-Q19 - 2010 XC11 - see above