Contents  on 28 March '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 28 March '09

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

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two updated listings. Both of these were "one nighters." So far The Tracking News has counted a total of eight 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 by Birtwhistle et al. at Suno Observatory.

New MPECs  on 28 March '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-F94 - "22:09 UT" - 2009 FR30

MPEC 2009-F93 - "18:44 UT" - 2009 FU30

MPEC 2009-F92 - "18:08 UT" - 2009 FJ30

<< DOU on 28 Mar. '09 >>  MPEC 2009-F91 - "06:12 UT" - Daily Orbit Update

Observers  on 28 March '09

Eighteen observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2009-F91 & 2009-F93 -- 2009 FU30, 90367, 10302
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 3 in MPEC 2009-F91 -- 2009 FO28, 2009 FL25, 2009 FA
J95Great Shefford Obs. in England, 2 in MPECs 2009-F91 & 2009-F92 -- 2009 FX10, 2009 FJ30
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-F91 -- 2009 FP28
379Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2009-F91 -- 2009 FD, 2009 FA, 2008 WL60, 2007 BT2, 2004 VC
J75La Sagra Obs. in Spain, 1 in MPEC 2009-F91 -- 2005 SG19
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2009-F91 -- 2009 FT, 2002 EZ2
711McDonald Obs. in Texas, 1 in MPEC 2009-F92 -- 2009 FJ30
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2009-F91, 2009-F92 & 2009-F93 -- 2009 FU30, 2009 FJ30, 2009 FG1, 2006 EV52, 7753, 5620
J93Mt. Tuffley Obs. in England, 1 in MPEC 2009-F91 -- 1036
D90.Cristovao Jacques in Brazil via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-F93 -- 2009 FU30
434San Benedetto Po Obs. in Italy, 3 in MPEC 2009-F91 -- 162900, 143651, 8566
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPEC 2009-F91 -- 2009 FG1, 2009 DF1
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2009-F91 -- 2009 EZ, 32906, 136617, 1036
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2009-F91 & 2009-F94 -- 2009 FR30, 2005 SG19
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2009-F91, 2009-F92 & 2009-F94 -- 2009 FY10, 2009 FR30, 2009 FN28, 2009 FJ30, 2009 FG19, 2009 FG, 2009 FF19, 2009 FE, 2009 EF3, 2009 DL46, 2009 DK46, 2009 DA45, 2009 CQ5, 2009 CN5, 2005 YP180
138Village-Neuf Obs. in France, 1 in MPEC 2009-F91 -- 141765
G56Walnut Creek Obs. in northern California, 1 in MPEC 2009-F91 -- 2009 FA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 March '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2150 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 FG19JPL Sentry23592022-2103381.1e-07-2.89-3.310JPL: "Analysis based on 44 observations spanning 5.9072 days (2009-Mar-21.44815 to 2009-Mar-27.35531)." Diameter approximately 0.820 km. from mean, weighted H=18.1.
NEODyS15402022-2087371.01e-07-2.90-3.310NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2009/03/21.449 to 2009/03/27.356."
2009 FGJPL Sentry23592022-2103296.7e-06-5.58-6.180JPL: "Analysis based on 53 observations spanning 10.943 days (2009-Mar-16.3986 to 2009-Mar-27.34187)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS15402036-2087234.7e-06-5.75-6.190NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2009/03/16.399 to 2009/03/27.343."
2009 FEJPL Sentry23592044-210332.5e-06-3.78-3.800JPL: "Analysis based on 53 observations spanning 11.222 days (2009-Mar-16.27919 to 2009-Mar-27.5007)." Diameter approximately 0.181 km. from mean, weighted H=21.3.
NEODyS15402044-208922.45e-06-3.77-3.770NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2009/03/16.280 to 2009/03/27.501."

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 28 March '09

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

2358Noted that JPL Sentry has updated its 2009 FE risk assessment - see above
Noted that JPL Sentry has updated its 2009 FG risk assessment - see above
Noted that JPL Sentry has updated its 2009 FG19 risk assessment - see above
2224Grabbed MPEC 2009-F94 - 2009 FR30 - see above
1848Grabbed MPEC 2009-F93 - 2009 FU30 - see above
1816Grabbed MPEC 2009-F92 - 2009 FJ30 - see above
1540Noted that NEODyS has updated its 2009 FE risk assessment - see above
Noted that NEODyS has updated its 2009 FG risk assessment - see above
Noted that NEODyS has updated its 2009 FG19 risk assessment - see above
0755Grabbed MPEC 2009-F91 - Daily Orbit Update - see above