Contents  on 14 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 14 September '09

The MPC's NEO Confirmation Page has 7 listings: 1 new, 6 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and six updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of eleven 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 14 September '09

Minor Planet Electronic Circulars

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

MPEC 2009-R57 - "10:31 UT" - 2009 RJ2

MPEC 2009-R56 - "10:29 UT" - 2009 RH2

MPEC 2009-R55 - "10:23 UT" - 2009 RG2

<< DOU on 14 Sept. '09 >>  MPEC 2009-R54 - "06:07 UT" - Daily Orbit Update

Observers  on 14 September '09

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-R54 -- 17274
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2009-R54 -- 2009 MC9, 17274
432Boambee Obs. in New South Wales, 1 in MPEC 2009-R54 -- 15745
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 4 in MPECs 2009-R54, 2009-R55, 2009-R56 & 2009-R57 -- 2009 RJ2, 2009 RH2, 2009 RG2, 2009 RD1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2009-R55, 2009-R56 & 2009-R57 -- 2009 RJ2, 2009 RH2, 2009 RG2
J28Jaen Obs. in Spain, 2 in MPEC 2009-R54 -- 138883, 1865
704LINEAR in New Mexico, 7 in MPECs 2009-R54, 2009-R55, 2009-R56 & 2009-R57 -- 2009 RJ2, 2009 RH2, 2009 RG2, 2009 QY33, 2005 EF, 52750, 159402
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2009-R54 -- 17511
I20Rio Cuarto Obs. in Argentina, 5 in MPEC 2009-R54 -- 2009 RN, 2009 RH, 2009 QY33, 2009 QC, 159402
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2009-R55, 2009-R56 & 2009-R57 -- 2009 RJ2, 2009 RH2, 2009 RG2
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2009-R56 -- 2009 RH2
B40Skylive Obs. in Italy, 2 in MPECs 2009-R55 & 2009-R57 -- 2009 RJ2, 2009 RG2
587Sormano Obs. in Italy, 3 in MPEC 2009-R54 -- 2009 RT1, 2009 RR, 2009 QB36
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 RRJPL Sentry14032102-2108112.4e-06-6.11-6.840JPL: "Analysis based on 24 observations spanning 1.8608 days (2009-Sep-11.18242 to 2009-Sep-13.04322)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2009 RNJPL Sentry14032091-210732.0e-09-6.50-6.770JPL: "Analysis based on 39 observations spanning 2.3023 days (2009-Sep-11.00009 to 2009-Sep-13.30238)." 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 14 September '09

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

1403Noted 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
Grabbed MPEC 2009-R54 - Daily Orbit Update - see above
Grabbed MPEC 2009-R55 - 2009 RG2 - see above
Grabbed MPEC 2009-R56 - 2009 RH2 - see above
Grabbed MPEC 2009-R57 - 2009 RJ2 - see above