Contents  on 5 September '08


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 5 September '08

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2359 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings. So far The Tracking News has counted a total of eight 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 5 September '08

Minor Planet Electronic Circulars

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

MPEC 2008-R30 - "17:14 UT" - Comet P/2001 X2 = 2008 R2 (Scotti)

MPEC 2008-R29 - "16:42 UT" - 2008 RK1

MPEC 2008-R28 - "16:37 UT" - 2008 RJ1

MPEC 2008-R27 - "16:22 UT" - 2008 RH1

MPEC 2008-R26 - "15:56 UT" - 2008 RG1

<< DOU on 5 Sept. '08 >>  MPEC 2008-R25 - "06:08 UT" - Daily Orbit Update

Observers  on 5 September '08

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
585Kiev Comet Station in the Ukraine, 1 in MPEC 2008-R25 -- 65690
704LINEAR in New Mexico, 2 in MPECs 2008-R25 & 2008-R26 -- 2008 RG1, 86666
711McDonald Obs. in Texas, 9 in MPEC 2008-R25 -- 2008 QT3, 2008 QF, 2008 OQ8, 2004 EN20, 2001 SG276, 2001 QH96, 162911, 108906, 9058
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-R30 -- P/2008 R2
B58Polaris Obs. in Hungary, 3 in MPEC 2008-R25 -- 2003 GW, 1998 SD9, 1994 AW1
H36Sandlot Obs. in Kansas, 2 in MPECs 2008-R26 & 2008-R28 -- 2008 RJ1, 2008 RG1
B40Skylive Obs. in Italy, 1 in MPEC 2008-R25 -- 1998 SD9
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2008-R25, 2008-R27, 2008-R28 & 2008-R30 -- 2008 RJ1, 2008 RH1, P/2008 R2, 38239
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2008-R25, 2008-R27, 2008-R28, 2008-R29 & 2008-R30 -- 2008 RK1, 2008 RJ1, 2008 RH1, P/2008 R2, 2007 YZ, 2006 WQ29, 2006 SU19, 2005 BY2, 2002 TB70, 2000 UG11
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2008-R25 & 2008-R26 -- 2008 RG1, 2000 CO101
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2008-R25 -- 1998 SD9
A98Taurus-1 Obs. in Belarus, 4 in MPEC 2008-R25 -- 188452, 16960, 8567, 1620
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 September '08

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.
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 Sentry19152012-2107175.4e-09-3.93-4.030JPL: "Analysis based on 12 observations spanning 1.0345 days (2008-Sep-04.40474 to 2008-Sep-05.43929)." Diameter approximately 1.200 km. from mean, weighted H=17.3.
2008 RG1JPL Sentry19152016-2108961.3e-07-4.39-5.010JPL: "Analysis based on 11 observations spanning 1.1507 days (2008-Sep-04.26332 to 2008-Sep-05.41401)." Diameter approximately 0.260 km. from mean, weighted H=20.6.

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 5 September '08

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

1915Noted that JPL Sentry has posted 2008 RG1 as an impact risk - see above
Noted that JPL Sentry has posted 2008 RJ1 as an impact risk - see above
1810Grabbed MPEC 2008-R30 - Comet P/2001 X2 = 2008 R2 (Scotti) - see above
1710Grabbed MPEC 2008-R27 - 2008 RH1 - see above
Grabbed MPEC 2008-R28 - 2008 RJ1 - see above
Grabbed MPEC 2008-R29 - 2008 RK1 - see above
1602Grabbed MPEC 2008-R26 - 2008 RG1 - see above
1435Grabbed MPEC 2008-R25 - Daily Orbit Update - see above