Contents  on 21 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 21 March '08

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

When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings. Both of these were "one nighters."

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 21 March '08

Minor Planet Electronic Circulars

As of last check at 2353 UTC, there have been eight MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-F21 - "15:29 UT" - PHAs

MPEC 2008-F20 - "15:29 UT" - Unusual Minor Planets

MPEC 2008-F19 - "15:29 UT" - Amors

MPEC 2008-F18 - "15:29 UT" - Atens and Apollos

MPEC 2008-F17 - "15:22 UT" - Distant Minor Planets

MPEC 2008-F16 - "14:45 UT" - Observable Comets

MPEC 2008-F15 - "10:55 UT" - 2006 RG7

<< DOU on 21 Mar. '08 >>  MPEC 2008-F14 - "06:06 UT" - Daily Orbit Update

Observers  on 21 March '08

Eleven observing facilities appear in today's MPECs.

CodeObserver / observatory
J32Aljaraque Obs. in Spain, 2 in MPEC 2008-F14 -- 11398, 3691
H55Astronomical Research Obs. (ARO) in Illinois, 5 in MPEC 2008-F14 -- 2008 EX84, 2008 EM85, 2008 ED69, 2008 EC69, 2008 EB32
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-F14 -- 2008 EG32, 2008 EC69
448Desert Moon Obs. in New Mexico, 7 in MPEC 2008-F14 -- 2008 EH, 2008 ED69, 2008 EC69, 2006 HX5, 2005 NB7, 53319, 171839
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-F14 -- 2008 EM85
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2008-F14 -- 2008 AF4
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-F15 -- 2006 RG7
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2008-F14 -- 2008 AE, 2007 VQ4, 53319, 1866
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-F14 -- 2008 EM85
A82Trieste Obs. in Italy, 3 in MPEC 2008-F14 -- 2008 EM85, 2008 AE, 2007 VQ4
A48Verona Obs. in Italy, 2 in MPEC 2008-F14 -- 2008 EM85, 2005 BE2

Impact Risk Monitoring  on 21 March '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2353 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 EC69JPL Sentry1359R E M O V E DJPL: Risk listing removed at 1023 UTC.
2008 AF4JPL Sentry19042089-210066.1e-05-1.88-1.971JPL: "Analysis based on 587 observations spanning 69.969 days (2008-Jan-10.39652 to 2008-Mar-20.36578)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
NEODyS1400208914.81e-05-1.98-1.981NEODyS: "Based on 591 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/03/20.367. NOTE: The Virtual Impactor in 2089/01/09.478 ... is rated as Torino Scale 1."

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 21 March '08

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

1904Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
1534Grabbed MPEC 2008-F17 - Distant Minor Planets - see above
1533Grabbed MPEC 2008-F16 - Observable Comets - see above
Grabbed MPEC 2008-F18 - Atens and Apollos - see above
Grabbed MPEC 2008-F19 - Amors - see above
Grabbed MPEC 2008-F20 - Unusual Minor Planets - see above
Grabbed MPEC 2008-F21 - PHAs - see above
1400Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
1359Noted that JPL Sentry has removed 2008 EC69 as an impact risk - see above
Noted that NEODyS has removed 2008 EC69 as an impact risk - see above
Grabbed MPEC 2008-F14 - Daily Orbit Update - see above
Grabbed MPEC 2008-F15 - 2006 RG7 - see above