Contents  on 6 September '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 6 September '11

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of nineteen 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 6 September '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 6 Sept. '11 >>  MPEC 2011-R23 - "06:04 UT" - Daily Orbit Update

Observers  on 6 September '11

Eight observers appear in today's MPEC.

CodeObserver / observatory
432Boambee Obs. in New South Wales, 3 in MPEC 2011-R23 -- 2011 JP29, 174050, 159368
B50Corner Obs. in Germany, 1 in MPEC 2011-R23 -- 1917
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2011-R23 -- 2011 GA55
B15Inastars Obs. in Germany, 2 in MPEC 2011-R23 -- 2003 QC10, 163081
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-R23 -- 2011 QH50
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-R23 -- 2011 QF48
510Siegen Obs. in Germany, 1 in MPEC 2011-R23 -- 1036
A98Taurus-1 Obs. in Belarus, 2 in MPEC 2011-R23 -- 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 6 September '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 QF48JPL Sentry1614206711.4e-07-6.80-6.800JPL: "Analysis based on 43 observations spanning 4.8990 days (2011-Aug-30.7015 to 2011-Sep-04.60046)." Diameter approximately 0.030 km. from mean, weighted H=25.2.
NEODyS16142067-208222.05e-07-6.64-6.760NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2011-08-30.702 to 2011-09-04.601."
2011 PE2JPL Sentry18522027-210343.4e-04-2.09-2.091JPL: "Analysis based on 78 observations spanning 26.268 days (2011-Aug-08.06387 to 2011-Sep-03.332193)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
2011 AG5JPL Sentry18522040-204757.1e-04-1.47-1.471JPL: "Analysis based on 190 observations spanning 236.04 days (2011-Jan-08.2673 to 2011-Sep-01.311792)." Diameter approximately 0.140 km. from mean, weighted H=21.9.

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 6 September '11

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

1852Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
1614Noted that JPL Sentry has updated its 2011 QF48 risk assessment - see above
Noted that NEODyS has updated its 2011 QF48 risk assessment - see above
Grabbed MPEC 2011-R23 - Daily Orbit Update - see above