Contents  on 4 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 4 September '08

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2357 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and five updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of nine 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 4 September '08

Minor Planet Electronic Circulars

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

MPEC 2008-R24 - "22:22 UT" - 1998 SD9

MPEC 2008-R23 - "21:11 UT" - 2008 RE1

MPEC 2008-R22 - "17:06 UT" - Comet C/2008 R1 (Garradd)

<< DOU on 4 Sept. '08 >>  MPEC 2008-R21 - "06:08 UT" - Daily Orbit Update

MPEC 2008-R20 - "03:41 UT" - 2008 NW4, 2008 OG19

Observers  on 4 September '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 12 in MPEC 2008-R21 -- 2008 QU11, 2008 QF, 2008 QA1, 2008 PE1, 2008 ON13, 2008 OM, 2008 NU, 2008 MH1, 2008 JZ7, 2008 JR26, 2005 OU1, 2002 SP
I77CEAMIG-REA in Brazil, 2 in MPECs 2008-R22 & 2008-R23 -- 2008 RE1, C/2008 R1
807Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2008-R20 -- 2008 OG19, 2008 NW4
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2008-R21 -- 164400
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2008-R22 -- C/2008 R1
585Kiev Comet Station in the Ukraine, 1 in MPEC 2008-R21 -- 4179
704LINEAR in New Mexico, 1 in MPEC 2008-R24 -- 1998 SD9
J75La Sagra Obs. in Spain, 4 in MPEC 2008-R21 -- 2008 MR1, 163000, 5011, 3352
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-R21 -- 2001 XW266
675Mt. Palomar in southern California, 2 in MPEC 2008-R20 -- 2008 OG19, 2008 NW4
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2008-R21 -- 35107
J53Posadas Obs. in Spain, 3 in MPEC 2008-R21 -- 2003 GW, 39572, 8567
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2008-R22 & 2008-R23 -- 2008 RE1, C/2008 R1
B40Skylive Obs. in Italy, 1 in MPEC 2008-R24 -- 1998 SD9
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-R21 -- 1999 RJ27
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2008-R21 -- 2008 QZ, 2008 QY, 2005 EA60, 2005 BY2, 2004 AE, 2002 VY94, 2002 TB70, 2001 SG10, 2000 UG11, 2000 CO101
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-R23 -- 2008 RE1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 RVJPL Sentry0140210611.4e-10-8.68-8.680JPL: "Analysis based on 24 observations spanning .77208 days (2008-Sep-02.45621 to 2008-Sep-03.22829)." Diameter approximately 0.150 km. from mean, weighted H=21.7.

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 4 September '08

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

2235Grabbed MPEC 2008-R24 - 1998 SD9 - see above
2116Grabbed MPEC 2008-R23 - 2008 RE1 - see above
1858Grabbed MPEC 2008-R22 - Comet C/2008 R1 (Garradd) - see above
1442Grabbed MPEC 2008-R21 - Daily Orbit Update - see above
0430Grabbed MPEC 2008-R20 - 2008 NW4, 2008 OG19 - see above
0140Noted that JPL Sentry has posted 2008 RV as an impact risk - see above