Contents  on 14 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 14 April '08

The MPC's NEO Confirmation Page has 10 listings: 3 new, 7 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and seven updated listings. All of these were "one nighters." So far The Tracking News has counted a total of fifteen 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 14 April '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been six MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-G82 - "18:49 UT" - 2006 HV122

MPEC 2008-G81 - "18:33 UT" - 2006 HR122

MPEC 2008-G80 - "15:57 UT" - 2008 GY21

MPEC 2008-G79 - "15:52 UT" - 2008 GX21

MPEC 2008-G78 - "14:42 UT" - 2008 FN = 1995 JG1

<< DOU on 14 Apr. '08 >>  MPEC 2008-G77 - "06:09 UT" - Daily Orbit Update

Observers  on 14 April '08

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2008-G77 -- 2008 FN6
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-G77 -- 53319, 153591
448Desert Moon Obs. in New Mexico, 6 in MPEC 2008-G77 -- 2008 GX, 2008 FW6, 2008 FT6, 2008 FN, 168318, 154278
734Farpoint Obs. in Kansas, 1 in MPEC 2008-G80 -- 2008 GY21
704LINEAR in New Mexico, 10 in MPEC 2008-G77 -- 2008 GW20, 2008 FU6, 2006 BG55, 2004 FN32, 85236, 179806, 170891, 152679, 137170, 102873
304Las Campanas Obs. in Chile, 2 in MPECs 2008-G81 & 2008-G82 -- 2006 HV122, 2006 HR122
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-G77, 2008-G79 & 2008-G80 -- 2008 GY21, 2008 GX21, 2006 UA, 2004 FE31, 85628, 138205, 136618, 1864
649Powell Obs. in Kansas, 1 in MPEC 2008-G78 -- 2008 FN
H06,Bill Dillon in Texas via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-G77 -- 152679
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2008-G77 -- 2005 JU108, 2005 GE59, 2003 HU42
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2008-G77 & 2008-G80 -- 2008 GY21, 2008 GO20, 2008 GM2, 2008 GF2, 2008 GB21, 2008 FW6, 2008 CB22, 2006 SL198, 2005 UW64, 2005 MX1, 2004 GD28
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-G79 -- 2008 GX21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2356 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 GY21JPL Sentry19592038-2099211.4e-07-8.10-8.710JPL: "Analysis based on 20 observations spanning 1.0578 days (2008-Apr-13.26806 to 2008-Apr-14.32589)." Diameter approximately 0.010 km. from mean, weighted H=27.6.
2008 GB21JPL Sentry1812R E M O V E DJPL: Risk listing removed at 1720 UTC.
2008 GO20JPL Sentry1812R E M O V E DJPL: Risk listing removed at 1638 UTC.
2008 GM2JPL Sentry18122063-2108391.8e-05-6.83-7.500JPL: "Analysis based on 51 observations spanning 7.8135 days (2008-Apr-06.41278 to 2008-Apr-14.22624)." Diameter approximately 0.007 km. from mean, weighted H=28.4.
NEODyS14392063-209098.89e-07-8.02-8.370NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/14.227."
2008 ER7JPL Sentry19592077-210262.1e-06-3.36-3.760JPL: "Analysis based on 85 observations spanning 36.933 days (2008-Mar-06.33608 to 2008-Apr-12.26908)." Diameter approximately 0.320 km. from mean, weighted H=20.1.

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 14 April '08

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

1959Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above
Noted that JPL Sentry has posted 2008 GY21 as an impact risk - see above
Grabbed MPEC 2008-G81 - 2006 HR122 - see above
Grabbed MPEC 2008-G82 - 2006 HV122 - see above
1812Noted that JPL Sentry has removed 2008 GB21 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 GM2 risk assessment - see above
Noted that JPL Sentry has removed 2008 GO20 as an impact risk - see above
1624Grabbed MPEC 2008-G78 - 2008 FN = 1995 JG1 - see above
Grabbed MPEC 2008-G79 - 2008 GX21 - see above
Grabbed MPEC 2008-G80 - 2008 GY21 - see above
1439Noted that NEODyS has updated its 2008 GM2 risk assessment - see above
1438Grabbed MPEC 2008-G77 - Daily Orbit Update - see above