Contents  on 7 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 7 September '11

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of 20 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 7 September '11

Minor Planet Electronic Circulars

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

MPEC 2011-R29 - "18:40 UT" - 2007 NC5

MPEC 2011-R28 - "17:40 UT" - 2011 RZ

MPEC 2011-R27 - "17:38 UT" - 2011 RX

MPEC 2011-R26 - "14:30 UT" - 2010 CC55

<< DOU on 7 Sept. '11 >>  MPEC 2011-R25 - "06:04 UT" - Daily Orbit Update

MPEC 2011-R24 - "02:01 UT" - Comet P/2011 R2 (Panstarrs)

Observers  on 7 September '11

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2011-R24, 2011-R25, 2011-R27, 2011-R28 & 2011-R29 -- 2011 RZ, 2011 RX, P/2011 R2, 2011 QS2, 2011 QG9, 2011 QG21, 2011 QF23, 2011 QE38, 2011 QE14, 2011 QC46, 2011 PF2, 2011 OM5, 2011 NZ, 2011 MV1, 2011 MT, 2011 LJ19, 2008 CM, 2007 NC5, 2004 JO2
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-R25 -- 2011 RF
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-R24 -- P/2011 R2
470Ceccano Obs. in Italy, 1 in MPEC 2011-R24 -- P/2011 R2
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2011-R24 & 2011-R25 -- P/2011 R2, 2011 QS49, 2011 QE48, 2011 QE38, 2011 QE14, 2011 QD48, 2011 OY17, 2011 OJ5
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-R28 -- 2011 RZ
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-R24 -- P/2011 R2
J95Great Shefford Obs. in England, 2 in MPECs 2011-R24 & 2011-R28 -- 2011 RZ, P/2011 R2
046Klet Obs. in the Czech Republic, 1 in MPEC 2011-R25 -- 2011 OC18
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2011-R25, 2011-R26 & 2011-R27 -- 2011 RX, 2011 RF, 2011 AG5, 2010 CC55
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2011-R24, 2011-R25, 2011-R27 & 2011-R28 -- 2011 RZ, 2011 RX, P/2011 R2, 2011 EZ40
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2011-R25 -- 2011 QF23, 2011 OV4, 2011 GA55, 2008 VH, 2008 SR7, 274855
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-R24 -- P/2011 R2
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-R24 -- P/2011 R2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-R24 -- P/2011 R2
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-R24 -- P/2011 R2
645Sloan Digital Sky Survey (SDSS) in New Mexico, 5 in MPEC 2011-R25 -- 2009 ST103, 2003 AD23, 2003 AA3, 2002 JE9, 216985
A97Stammersdorf Obs. in Austria, 1 in MPEC 2011-R25 -- 1036
B18Terskol Obs. in Russia, 1 in MPEC 2011-R24 -- P/2011 R2
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-R25 -- 2011 OV4
244geocentric occultation observation, 1 in MPEC 2011-R25 -- 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 QD48JPL Sentry1612R E M O V E DJPL: Risk listing removed at 1032 UTC.
NEODyS1612R E M O V E D-
2011 AG5JPL Sentry23162040-204757.7e-04-1.43-1.441JPL: "Analysis based on 193 observations spanning 238.12 days (2011-Jan-08.2673 to 2011-Sep-03.391168)." 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 7 September '11

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

2316Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
2029Grabbed MPEC 2011-R29 - 2007 NC5 - see above
1807Grabbed MPEC 2011-R27 - 2011 RX - see above
Grabbed MPEC 2011-R28 - 2011 RZ - see above
1612Noted that JPL Sentry has removed 2011 QD48 as an impact risk - see above
Noted that NEODyS has removed 2011 QD48 as an impact risk - see above
Grabbed MPEC 2011-R25 - Daily Orbit Update - see above
Grabbed MPEC 2011-R26 - 2010 CC55 - see above
0453Grabbed MPEC 2011-R24 - Comet P/2011 R2 (Panstarrs) - see above