Contents  on 28 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 28 August '11

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2320 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of seventeen 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 28 August '11

Minor Planet Electronic Circulars

As of last check at 2320 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 28 Aug. '11 >>  MPEC 2011-Q44 - "06:04 UT" - Daily Orbit Update

MPEC 2011-Q43 - "00:36 UT" - 2001 SO263

Observers  on 28 August '11

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2011-Q43 & 2011-Q44 -- 2011 QY11, 2011 QJ21, 2011 QF14, 2011 QE14, 2011 QC14, 2011 QA14, 2011 PU1, 2011 PE2, 2011 NV, 2001 SO263
157Frasso Sabino Obs. in Italy, 1 in MPEC 2011-Q44 -- 2011 QT2
474Mt. John Obs. in New Zealand, 10 in MPEC 2011-Q44 -- 2011 QX8, 2011 QJ21, 2011 QF14, 2011 QE2, 2011 PT1, 2011 PT, 2011 PS, 2011 OR15, 2011 OJ5, 2011 OC18
A13Naef Obs. in Switzerland, 1 in MPEC 2011-Q44 -- 2000 RD34
C27Pallerols Obs. in Spain, 1 in MPEC 2011-Q44 -- 253841
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2011-Q44 -- 2000 DQ110, 143678
A53Peschiera del Garda Obs. in Italy, 4 in MPEC 2011-Q44 -- 2011 OY17, 2011 OV4, 2011 JA8, 2000 CP101
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2011-Q44 -- 2011 QF23, 2011 QE23
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-Q43 -- 2001 SO263
104San Marcello Pistoiese Obs. in Italy, 1 in MPECs 2011-Q43 & 2011-Q44 -- 2001 SO263
204Schiaparelli Obs. in Italy, 9 in MPEC 2011-Q44 -- 2011 OY17, 2011 OQ5, 2011 OM5, 2011 OC18, 2008 SR7, 2008 SO, 2005 JA22, 2004 QJ7, 2000 DQ110
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2011-Q44 -- 2011 QJ21, 2011 QE23, 2009 AV, 136923
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-Q44 -- 2001 SO263
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2011-Q44 -- 2011 KN9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2320 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 PE2NEODyS17102027-209042.49e-04-2.24-2.240NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-27.330."
JPL Sentry15442027-210352.4e-04-2.27-2.280JPL: "Analysis based on 62 observations spanning 19.265 days (2011-Aug-08.06387 to 2011-Aug-27.329216)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
2011 PU1NEODyS17102061-20901012.82e-04-3.88-4.340NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2011-08-06.968 to 2011-08-27.253."
JPL Sentry15442061-2102652.0e-04-4.03-4.500JPL: "Analysis based on 38 observations spanning 20.284 days (2011-Aug-06.9677 to 2011-Aug-27.252129)." Diameter approximately 0.032 km. from mean, weighted H=25.1.

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 28 August '11

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

1710Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has updated its 2011 PU1 risk assessment - see above
1544Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 PU1 risk assessment - see above
Grabbed MPEC 2011-Q44 - Daily Orbit Update - see above
0125Grabbed MPEC 2011-Q43 - 2001 SO263 - see above