Contents  on 17 April '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 17 April '09

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and four updated listings. All of these were "one nighters." So far The Tracking News has counted a total of seven 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 17 April '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-H03 - "17:48 UT" - 2009 HB

<< DOU on 17 Apr. '09 >>  MPEC 2009-H02 - "06:06 UT" - Daily Orbit Update

Observers  on 17 April '09

Eighteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 17 in MPECs 2009-H02 & 2009-H03 -- 2009 HB, 2009 FY4, 2009 FN32, 2009 FJ30, 2009 FJ, 2009 FG1, 2009 FF44, 2009 FF19, 2009 FF, 2009 EF3, 2009 DV42, 2009 DO1, 2009 DG9, 2009 CU1, 2009 CT1, 2009 BM2, 2009 BH58
A81Balzaretto Obs. in Italy, 2 in MPEC 2009-H02 -- 2009 CR2, 2009 CQ1
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-H02 -- 2002 JY8
127Bornheim Obs. in Germany, 13 in MPEC 2009-H02 -- 2009 DO111, 2008 SV11, 2008 EV5, 2007 BT2, 207398, 143651, 141052, 12711, 8566, 7358, 4179, 3554, 1864
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2009-H02 & 2009-H03 -- 2009 HB, 85774, 5011
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2009-H03 -- 2009 HB
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 6 in MPEC 2009-H02 -- 2009 DL1, 2009 DE47, 2008 WN2, 2008 WL60, 2008 SV11, 2007 BT2
639Dresden Obs. in Germany, 3 in MPEC 2009-H02 -- 2008 WL60, 2008 SV11, 2007 BT2
I21El Condor Obs. in Argentina, 4 in MPEC 2009-H02 -- 2009 DL1, 2005 SG19, 5604, 1036
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-H03 -- 2009 HB
704LINEAR in New Mexico, 2 in MPEC 2009-H02 -- 22771, 3122
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 11 in MPEC 2009-H02 -- 2009 FY4, 2009 FV4, 2009 FT32, 2009 FT, 2009 FR30, 2009 FJ44, 2009 FJ30, 2009 FH44, 2009 FG19, 2009 FF, 2009 DZ
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-H03 -- 2009 HB
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-H03 -- 2009 HB
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-H03 -- 2009 HB
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPEC 2009-H02 -- 2009 EO2, 2009 DL1, 2000 NM, 68348, 18882, 433
510Siegen Obs. in Germany, 1 in MPEC 2009-H02 -- 2007 BT2
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2009-H02 -- 2009 FN32, 2009 FJ44, 2009 FF44, 2009 FF19, 2009 FF, 2009 EC1, 2009 DK46, 2009 DA45, 2003 WO7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 April '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 FJJPL Sentry13092058-2107103.7e-05-4.46-4.480JPL: "Analysis based on 122 observations spanning 29.928 days (2009-Mar-17.30916 to 2009-Apr-16.23691)." Diameter approximately 0.036 km. from mean, weighted H=24.9.
NEODyS13092058-208843.58e-05-4.46-4.480NEODyS: "Based on 129 optical observations (of which 7 are rejected as outliers) from 2009/03/17.245 to 2009/04/16.238."

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 17 April '09

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

1800Grabbed MPEC 2009-H03 - 2009 HB - see above
1309Noted that JPL Sentry has updated its 2009 FJ risk assessment - see above
Noted that NEODyS has updated its 2009 FJ risk assessment - see above
Grabbed MPEC 2009-H02 - Daily Orbit Update - see above