Contents  on 23 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 23 September '08

The MPC's NEO Confirmation Page has 17 listings: 6 new, 11 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and eleven updated listings. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 20 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 23 September '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-S37 - "21:55 UT" - 2008 SN1

<< DOU on 23 Sept. '08 >>  MPEC 2008-S36 - "06:06 UT" - Daily Orbit Update

Observers  on 23 September '08

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 2 in MPECs 2008-S36 & 2008-S37 -- 2008 SN1, 2008 SA
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-S36 -- 2002 SP, 189700
970Chelmsford Obs. in England, 1 in MPEC 2008-S36 -- 2008 SA
448Desert Moon Obs. in New Mexico, 2 in MPECs 2008-S36 & 2008-S37 -- 2008 SN1, 2008 PH9
J77Golden Hill Obs. in England, 1 in MPEC 2008-S36 -- 2008 SA
J95Great Shefford Obs. in England, 3 in MPECs 2008-S36 & 2008-S37 -- 2008 SR, 2008 SN1, 2007 MM13
701Junk Bond Obs. in Arizona, 1 in MPEC 2008-S37 -- 2008 SN1
J66Kinver Obs. in England, 1 in MPEC 2008-S37 -- 2008 SN1
704LINEAR in New Mexico, 11 in MPEC 2008-S36 -- 2008 RY24, 2008 RV, 2008 QZ, 2005 LR3, 2004 EN20, 2003 RM10, 2003 FQ6, 65733, 11405, 5011, 4257
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2008-S36 -- 2002 SS41
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2008-S36 & 2008-S37 -- 2008 SN1, 2001 SG10, 65733, 190166, 162566
J47Nazaret Obs. in Spain, 1 in MPEC 2008-S37 -- 2008 SN1
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2008-S36 -- 2008 PV16, 2008 ON
473Remanzacco Obs. in Italy, 1 in MPEC 2008-S37 -- 2008 SN1
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-S37 -- 2008 SN1
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2008-S36 -- 24475, 144901, 11398
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2008-S36 -- 2006 SU19, 108906, 8567
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2008-S36 & 2008-S37 -- 2008 ST, 2008 SO, 2008 SN1, 2008 RK1, 2008 QC1, 2005 VC, 2004 AE
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-S37 -- 2008 SN1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 September '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 STNEODyS19002041-2090361.54e-04-5.09-5.340NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2008/09/22.162 to 2008/09/23.107."
JPL Sentry13532037-21071021.8e-04-5.02-5.320JPL: "Analysis based on 24 observations spanning .94507 days (2008-Sep-22.16113 to 2008-Sep-23.1062)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2008 SRJPL Sentry1353R E M O V E DJPL: Risk listing removed at 0849 UTC.
2008 SOJPL Sentry1353R E M O V E DJPL: Risk listing removed at 0849 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 23 September '08

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

2200Grabbed MPEC 2008-S37 - 2008 SN1 - see above
1900Noted that NEODyS has posted 2008 ST as an impact risk - see above
1353Noted that JPL Sentry has removed 2008 SO as an impact risk - see above
Noted that JPL Sentry has removed 2008 SR as an impact risk - see above
Noted that JPL Sentry has updated its 2008 ST risk assessment - see above
Grabbed MPEC 2008-S36 - Daily Orbit Update - see above