Contents  on 28 March '08


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 '08

The MPC's NEO Confirmation Page has 6 listings: 6 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of sixteen objects listed 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 '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been nine MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-F48 - "16:52 UT" - 2008 FP

MPEC 2008-F47 - "16:20 UT" - 2008 FO

MPEC 2008-F46 - "15:46 UT" - 2008 FN

MPEC 2008-F45 - "15:41 UT" - 2008 FM

MPEC 2008-F44 - "15:38 UT" - 2008 FK

MPEC 2008-F43 - "15:33 UT" - 2008 FJ

MPEC 2008-F42 - "15:27 UT" - 2008 FH

MPEC 2008-F41 - "15:10 UT" - 2008 FG

<< DOU on 28 Mar. '08 >>  MPEC 2008-F40 - "06:07 UT" - Daily Orbit Update

Observers  on 28 March '08

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2008-F40 -- 2008 EY5, 2008 EV68, 2008 EM7, 2008 EB9
651Grasslands Obs. in Arizona, 3 in MPECs 2008-F41, 2008-F42 & 2008-F47 -- 2008 FO, 2008 FH, 2008 FG
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-F47 -- 2008 FO
A35Hormersdorf Obs. in Germany, 1 in MPEC 2008-F40 -- 2008 EM85
704LINEAR in New Mexico, 7 in MPECs 2008-F40 & 2008-F47 -- 2008 FO, 2008 BC22, 86667, 179806, 9400, 5836, 3288
809|EURONEAR via La Silla in Chile, 2 in MPEC 2008-F40 -- 2008 EJ9, 162173
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2008-F40 -- 2008 EE85
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2008-F40, 2008-F42, 2008-F43, 2008-F45, 2008-F46, 2008-F47 & 2008-F48 -- 2008 FP, 2008 FO, 2008 FN, 2008 FM, 2008 FJ, 2008 FH, 177049
619Sabadell Obs. in Spain, 1 in MPEC 2008-F40 -- 1620
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-F48 -- 2008 FP
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2008-F40, 2008-F41 & 2008-F44 -- 2008 FK, 2008 FG, 2004 CR2, 138205, 136618, 11054, 3552
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2008-F40, 2008-F41, 2008-F42, 2008-F44, 2008-F45 & 2008-F46 -- 2008 FN, 2008 FM, 2008 FK, 2008 FH, 2008 FG, 2008 EW5, 2008 EA9, 2008 DX, 2008 DW22, 2008 DH23, 2007 PH25, 2005 MP13
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-F47 -- 2008 FO
6739Heath Rhoades via Table Mtn. Obs. in southern California, 1 in MPEC 2008-F47 -- 2008 FO
F85Tiki Obs. in Tahiti, 2 in MPECs 2008-F47 & 2008-F48 -- 2008 FP, 2008 FO

Impact Risk Monitoring  on 28 March '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
2008 FKJPL Sentry1959203618.6e-07-6.84-6.840JPL: "Analysis based on 11 observations spanning 1.0273 days (2008-Mar-27.25247 to 2008-Mar-28.27974)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
2008 EA9NEODyS14472063-2089244.78e-05-6.01-6.460NEODyS: "Based on 43 optical observations (of which 1 are rejected as outliers) from 2008/03/06.406 to 2008/03/27.271."
JPL Sentry14462068-210654.3e-05-6.07-6.440JPL: "Analysis based on 42 observations spanning 20.865 days (2008-Mar-06.40551 to 2008-Mar-27.27057)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

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 '08

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

1959Noted that JPL Sentry has posted 2008 FK as an impact risk - see above
1714Grabbed MPEC 2008-F48 - 2008 FP - see above
1625Grabbed MPEC 2008-F42 - 2008 FH - see above
Grabbed MPEC 2008-F43 - 2008 FJ - see above
Grabbed MPEC 2008-F44 - 2008 FK - see above
Grabbed MPEC 2008-F45 - 2008 FM - see above
Grabbed MPEC 2008-F46 - 2008 FN - see above
Grabbed MPEC 2008-F47 - 2008 FO - see above
1515Grabbed MPEC 2008-F41 - 2008 FG - see above
1447Noted that NEODyS has updated its 2008 EA9 risk assessment - see above
Grabbed MPEC 2008-F40 - Daily Orbit Update - see above
1446Noted that JPL Sentry has updated its 2008 EA9 risk assessment - see above