Contents  on 7 September '08

Note: These A/CC news pages will update less often and at irregular intervals through Wednesday, September 10th.


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 '08

The MPC's NEO Confirmation Page has 22 listings: 5 new, 17 updated

When last checked at 2357 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five new and seventeen updated listings. Of these, nine were "one nighters." So far The Tracking News has counted a total of 23 objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 7 September '08

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 7 Sept. '08 >>  MPEC 2008-R32 - "06:08 UT" - Daily Orbit Update

Observers  on 7 September '08

Fourteen observing facilities appear in today's MPEC.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2008-R32 -- 2002 VV17
I77CEAMIG-REA in Brazil, 1 in MPEC 2008-R32 -- 2008 QS11
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2008-R32 -- 2005 BC, 2002 QY6, 163335, 163000, 140288, 7888, 5011, 3352
448Desert Moon Obs. in New Mexico, 2 in MPEC 2008-R32 -- 2008 RT, 2007 SR1
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-R32 -- 2008 QT3
701Junk Bond Obs. in Arizona, 2 in MPEC 2008-R32 -- 2008 RJ1, 2008 RG1
704LINEAR in New Mexico, 1 in MPEC 2008-R32 -- 1994 AW1
J75La Sagra Obs. in Spain, 2 in MPEC 2008-R32 -- 163000, 3352
474Mt. John Obs. in New Zealand, 2 in MPEC 2008-R32 -- 2008 RV, 2008 QS11
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2008-R32 -- 190208, 4660
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2008-R32 -- 2005 TZ51, 2004 SB56, 2003 GW, 2001 SW269, 1994 AW1
E12Siding Spring Survey (SSS) in New South Wales, 10 in MPEC 2008-R32 -- 2008 RU, 2008 RT, 2008 RE1, 2008 QT11, 2008 QS11, 2008 OM8, 2008 JO24, 189062, 144901, 11405
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2008-R32 -- 2004 XN44, 1999 RJ27, 65733
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2008-R32 -- 2008 RK1, 2008 RJ1, 2008 RH1, 2008 RG1, 2008 KV28
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 September '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2357 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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2008 RJ1JPL Sentry16272017-2074118.1e-09-3.76-4.040JPL: "Analysis based on 17 observations spanning 1.8842 days (2008-Sep-04.40474 to 2008-Sep-06.28897)." Diameter approximately 1.300 km. from mean, weighted H=17.1.
NEODyS16272010-2077211.18e-08-2.89-2.930NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/09/04.405 to 2008/09/06.290."
2008 RH1NEODyS1627R E M O V E D-
2008 RG1NEODyS1627R E M O V E D-
JPL Sentry1627R E M O V E DJPL: Risk listing removed at 0852 UTC.

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 '08

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

1627Noted that JPL Sentry has removed 2008 RG1 as an impact risk - see above
Noted that NEODyS has removed 2008 RG1 as an impact risk - see above
Noted that NEODyS has removed 2008 RH1 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 RJ1 risk assessment - see above
Noted that NEODyS has updated its 2008 RJ1 risk assessment - see above
Grabbed MPEC 2008-R32 - Daily Orbit Update - see above