Contents  on 16 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 16 September '09

The MPC's NEO Confirmation Page has 16 listings: 1 new, 15 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and fifteen updated listings. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of nineteen 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 16 September '09

Minor Planet Electronic Circulars

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

MPEC 2009-S02 - "17:15 UT" - 2009 RX4

<< DOU on 16 Sept. '09 >>  MPEC 2009-S01 - "06:07 UT" - Daily Orbit Update

Observers  on 16 September '09

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2009-S01 -- 2000 CO101
H55Astronomical Research Obs. (ARO) in Illinois, 9 in MPEC 2009-S01 -- 2009 RR, 2009 RN, 2009 RG2, 2009 RD1, 2009 QR8, 2009 QF31, 2009 QE34, 2009 QC23, 2009 QB35
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2009-S01 -- 2009 QH2, 2004 RD84, 16834, 1865
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2009-S01 -- 2009 RH2, 2009 RD1
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-S01 -- 2009 HB82
704LINEAR in New Mexico, 9 in MPEC 2009-S01 -- 2009 RB4, 2009 QG34, 88263, 85818, 30825, 154244, 143678, 138883, 5646
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2009-S01 & 2009-S02 -- 2009 RX4, 2000 BG19, 185716
D90`K. Hills via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-S01 -- 2009 RD4
G68Sierra Stars Obs. in northern California, 1 in MPEC 2009-S01 -- 216985
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2009-S01 -- 2009 RV1, 2007 VZ30, 30825, 138815, 3361
291Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2009-S01 -- 2009 RN, 2009 QS, 2009 QR8, 2009 QM5, 2009 QL32, 2009 QH34, 2009 QC23, 2009 QA35, 2006 VT2, 2006 KD1, 2005 UM5, 2004 XD50, 2002 YF4, 2002 NX
G56Walnut Creek Obs. in northern California, 2 in MPEC 2009-S01 -- 2009 QC36, 2002 NP1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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 RZ3NEODyS13262014-2089321.73e-08-3.45-3.680NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2009/09/14.206 to 2009/09/15.246."
2009 RRJPL Sentry19002098-2108137.6e-06-5.64-6.240JPL: "Analysis based on 35 observations spanning 3.8834 days (2009-Sep-11.18242 to 2009-Sep-15.065792)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2009 RNJPL Sentry1900R E M O V E DJPL: Risk listing removed at 1723 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 16 September '09

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

1900Noted that JPL Sentry has removed 2009 RN as an impact risk - see above
Noted that JPL Sentry has updated its 2009 RR risk assessment - see above
Grabbed MPEC 2009-S02 - 2009 RX4 - see above
1326Noted that NEODyS has posted 2009 RZ3 as an impact risk - see above
Grabbed MPEC 2009-S01 - Daily Orbit Update - see above