Contents  on 15 September '09


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 15 September '09

The MPC's NEO Confirmation Page has 4 listings: 2 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of ten listings on the NEOCP at some point 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 15 September '09

Minor Planet Electronic Circulars

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

MPEC 2009-R63 - "21:25 UT" - 2009 RD4

MPEC 2009-R62 - "11:32 UT" - 2009 RB4

MPEC 2009-R61 - "11:28 UT" - 2009 RA4

MPEC 2009-R60 - "11:24 UT" - 2009 RZ3

MPEC 2009-R59 - "11:21 UT" - 2009 RY3

<< DOU on 15 Sept. '09 >>  MPEC 2009-R58 - "06:07 UT" - Daily Orbit Update

Observers  on 15 September '09

Eighteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 3 in MPECs 2009-R60, 2009-R61 & 2009-R62 -- 2009 RZ3, 2009 RB4, 2009 RA4
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2009-R58 -- 2009 OC, 2009 HB82, 154278
A77Chante-Perdrix Obs. in France, 1 in MPEC 2009-R58 -- 159402
I21El Condor Obs. in Argentina, 1 in MPEC 2009-R58 -- 2009 QL8
J95Great Shefford Obs. in England, 5 in MPECs 2009-R58, 2009-R60, 2009-R61 & 2009-R62 -- 2009 RZ3, 2009 RR, 2009 RG2, 2009 RB4, 2009 RA4
A17Guidestar Obs. in Germany, 3 in MPECs 2009-R58, 2009-R60 & 2009-R62 -- 2009 RZ3, 2009 RB4, 2009 QB35
585Kiev Comet Station in the Ukraine, 1 in MPEC 2009-R58 -- 433
704LINEAR in New Mexico, 16 in MPECs 2009-R58, 2009-R60, 2009-R61 & 2009-R62 -- 2009 RZ3, 2009 RH2, 2009 RD1, 2009 RB4, 2009 RA4, 2009 QZ34, 2009 OC, 2007 RQ17, 2004 RK9, 1993 RA, 216985, 152664, 143487, 143409, 5786, 3361
J75La Sagra Obs. in Spain, 1 in MPEC 2009-R58 -- 138883
844Los Molinos Obs. in Uruguay, 1 in MPEC 2009-R59 -- 2009 RY3
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2009-R58 -- 433
D90`K. Hills via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-R63 -- 2009 RD4
854Sabino Canyon Obs. in Arizona, 4 in MPECs 2009-R59, 2009-R60, 2009-R61 & 2009-R62 -- 2009 RZ3, 2009 RY3, 2009 RB4, 2009 RA4
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2009-R58 -- 2009 MC9
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-R59 & 2009-R63 -- 2009 RY3, 2009 RD4
H85Silver Spring Obs. in Maryland, 1 in MPEC 2009-R58 -- 2009 QC36
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-R58 -- 162998
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2009-R58, 2009-R60, 2009-R61 & 2009-R62 -- 2009 RZ3, 2009 RV1, 2009 RN, 2009 RB4, 2009 RA4, 2009 QZ34, 2009 QM5, 2009 QF34, 2009 QA35, 2009 PT2, 2009 MS, 2009 BH81
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 September '09

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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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
2009 RZ3JPL Sentry13242014-2109272.2e-08-3.38-3.600JPL: "Analysis based on 19 observations spanning 1.0400 days (2009-Sep-14.20535 to 2009-Sep-15.24539)." Diameter approximately 0.641 km. from mean, weighted H=18.6.
2009 RRJPL Sentry13242098-2108133.9e-06-5.92-6.490JPL: "Analysis based on 31 observations spanning 3.8348 days (2009-Sep-11.18242 to 2009-Sep-15.017229)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
2009 RNJPL Sentry1324210312.8e-10-7.35-7.350JPL: "Analysis based on 42 observations spanning 3.4454 days (2009-Sep-11.00009 to 2009-Sep-14.44548)." Diameter approximately 0.370 km. from mean, weighted H=19.8.

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 15 September '09

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

2301Grabbed MPEC 2009-R63 - 2009 RD4 - see above
1324Noted that JPL Sentry has updated its 2009 RN risk assessment - see above
Noted that JPL Sentry has updated its 2009 RR risk assessment - see above
Noted that JPL Sentry has posted 2009 RZ3 as an impact risk - see above
Grabbed MPEC 2009-R58 - Daily Orbit Update - see above
Grabbed MPEC 2009-R59 - 2009 RY3 - see above
Grabbed MPEC 2009-R60 - 2009 RZ3 - see above
Grabbed MPEC 2009-R61 - 2009 RA4 - see above
Grabbed MPEC 2009-R62 - 2009 RB4 - see above