Contents  on 12 April '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 12 April '08

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were five listings noted earlier today.

New MPECs  on 12 April '08

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-G72 - "12:55 UT" - 2008 GB21

MPEC 2008-G71 - "11:56 UT" - 2008 GW20

MPEC 2008-G70 - "11:48 UT" - 2008 GV20

MPEC 2008-G69 - "11:45 UT" - 2008 GU20

<< DOU on 12 Apr. '08 >>  MPEC 2008-G68 - "06:09 UT" - Daily Orbit Update

Observers  on 12 April '08

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 1 in MPEC 2008-G71 -- 2008 GW20
I77CEAMIG-REA in Brazil, 1 in MPEC 2008-G71 -- 2008 GW20
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2008-G68, 2008-G69, 2008-G71 & 2008-G72 -- 2008 GW20, 2008 GU20, 2008 GP20, 2008 GB21, 2008 EM85, 2008 CP23, 2006 KE89, 2004 VW14, 2004 CR2, 2000 DP107, 102873, 5836
474Mt. John Obs. in New Zealand, 1 in MPEC 2008-G68 -- 2008 GL20
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-G68, 2008-G69, 2008-G70 & 2008-G71 -- 2008 GW20, 2008 GV20, 2008 GU20, 2008 CM116, 2005 GP21, 2000 DP107, 1999 SO5, 6037
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2008-G68 -- 2008 EM85, 2008 DE, 2007 VQ4, 2006 BG55, 154988, 141531
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-G71 -- 2008 GW20
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2008-G68 -- 2008 FT6, 2008 FS6, 2008 DJ5, 68278, 24445
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2008-G68 & 2008-G69 -- 2008 GU20, 2008 GM2, 2008 GA4, 2008 FS6, 2008 FO
6735Jim Young via Table Mtn. Obs. in southern California, 6 in MPECs 2008-G68, 2008-G69, 2008-G71 & 2008-G72 -- 2008 GW20, 2008 GU20, 2008 GQ3, 2008 GP20, 2008 GB4, 2008 GB21
F85Tiki Obs. in Tahiti, 2 in MPECs 2008-G68 & 2008-G69 -- 2008 GU20, 2008 FS6
A92Urseanu Obs. in Romania, 1 in MPEC 2008-G68 -- 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2355 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 GB21JPL Sentry18352015-21071481.3e-06-6.15-6.240JPL: "Analysis based on 12 observations spanning .10598 days (2008-Apr-12.38708 to 2008-Apr-12.49306)." Diameter approximately 0.023 km. from mean, weighted H=25.8.
2008 GO20NEODyS14552011-20881026.58e-07-4.64-5.340NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/04/09.312 to 2008/04/11.404."
2008 GM2NEODyS14552069-2085101.19e-06-7.85-8.110NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/11.378."
JPL Sentry14542063-2108481.9e-05-6.76-7.450JPL: "Analysis based on 43 observations spanning 4.9642 days (2008-Apr-06.41278 to 2008-Apr-11.37698)." Diameter approximately 0.007 km. from mean, weighted H=28.3.

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 12 April '08

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

1835Noted that JPL Sentry has posted 2008 GB21 as an impact risk - see above
1455Noted that NEODyS has updated its 2008 GM2 risk assessment - see above
1454Noted that JPL Sentry has updated its 2008 GM2 risk assessment - see above
Noted that NEODyS has posted 2008 GO20 as an impact risk - see above
Grabbed MPEC 2008-G68 - Daily Orbit Update - see above
Grabbed MPEC 2008-G69 - 2008 GU20 - see above
Grabbed MPEC 2008-G70 - 2008 GV20 - see above
Grabbed MPEC 2008-G71 - 2008 GW20 - see above
Grabbed MPEC 2008-G72 - 2008 GB21 - see above
The NEOCP has become empty