Contents  on 8 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 8 April '08

The MPC's NEO Confirmation Page has 18 listings: 3 new, 15 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and fifteen updated listings. Of these, eight were "one nighters." So far The Tracking News has counted a total of 24 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 8 April '08

Minor Planet Electronic Circulars

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

MPEC 2008-G45 - "17:26 UT" - 2005 GC187

MPEC 2008-G44 - "16:22 UT" - Comets C/2007 L2, 2007 L3, 2007 L13, 2007 V4 (SOHO)

<< DOU on 8 Apr. '08 >>  MPEC 2008-G43 - "06:08 UT" - Daily Orbit Update

Observers  on 8 April '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2008-G43 -- 2007 VQ4
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2008-G43 -- 85236, 175921, 153591, 142040, 137158, 5587
448Desert Moon Obs. in New Mexico, 2 in MPEC 2008-G43 -- 2008 DJ5, 168318
151Eschenberg Obs. in Switzerland, 1 in MPEC 2008-G43 -- 1864
J95Great Shefford Obs. in England, 1 in MPEC 2008-G43 -- 2008 GF1
704LINEAR in New Mexico, 18 in MPEC 2008-G43 -- 2008 FY6, 2004 CR2, 2001 HY7, 2000 DP107, 54686, 41429, 34613, 18736, 153591, 152679, 138205, 136874, 13553, 7977, 6037, 5646, 5626, 4503
304Las Campanas Obs. in Chile, 1 in MPEC 2008-G45 -- 2005 GC187
688Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2008-G45 -- 2005 GC187
711McDonald Obs. in Texas, 8 in MPEC 2008-G43 -- 2008 GE1, 2008 FT6, 2008 FN, 2008 AE, 2007 VY7, 2006 KE89, 2002 EV11, 154347
474Mt. John Obs. in New Zealand, 2 in MPEC 2008-G43 -- 2008 EP6, 2005 CV25
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 20 in MPEC 2008-G43 -- 2008 GD, 2008 FU6, 2008 FO, 2008 ES, 2008 EO6, 2008 EM85, 2008 DE, 2008 CZ118, 2008 AE, 2007 VQ4, 2006 UA, 2006 BG55, 2005 GY8, 2003 GW, 2000 DP107, 89830, 35107, 152942, 141531, 137158
C495COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 4 in MPEC 2008-G44 -- C/2007 V4, C/2007 L3, C/2007 L2, C/2007 L13
C504HI1-B instrument (4) aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2008-G44 -- C/2007 V4
C505COR2-B instrument (5) aboard STEREO-B in heliocentric orbit trailing Earth, 3 in MPEC 2008-G44 -- C/2007 V4, C/2007 L3, C/2007 L2
204Schiaparelli Obs. in Italy, 4 in MPEC 2008-G43 -- 2008 GV, 2008 BC22, 2005 NB7, 2003 GW
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2008-G43 -- 2004 CR2, 68278, 24445, 138205, 136618, 5626
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2008-G43 -- 2008 FT6, 2008 FN, 2008 FK7
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-G43 -- 2008 FY6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 GM2JPL Sentry20022070-2107379.9e-06-7.03-7.710JPL: "Analysis based on 34 observations spanning .91768 days (2008-Apr-06.41278 to 2008-Apr-07.33046)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
NEODyS16352071-2090221.48e-06-7.73-8.220NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/07.331."
2008 GJJPL Sentry2258R E M O V E DJPL: Risk listing removed at 2211 UTC.
2008 FF5JPL Sentry19052029-207032.5e-07-5.06-5.110JPL: "Analysis based on 50 observations spanning 7.9586 days (2008-Mar-28.32219 to 2008-Apr-05.28081)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
2008 DBJPL Sentry17552046-2108315.6e-05-4.68-4.770JPL: "Analysis based on 63 observations spanning 24.274 days (2008-Feb-18.242 to 2008-Mar-13.516061)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2008 AF4JPL Sentry21582089-210071.8e-05-2.44-2.690JPL: "Analysis based on 596 observations spanning 85.831 days (2008-Jan-10.39652 to 2008-Apr-05.22713)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
2007 UW1JPL Sentry21582048-2107917.6e-05-3.40-4.270JPL: "Analysis based on 32 observations spanning 7.0807 days (2007-Oct-17.44246 to 2007-Oct-24.52312)." Diameter approximately 0.097 km. from mean, weighted H=22.7.
1999 SF10JPL Sentry20562080-210541.5e-06-5.82-6.210JPL: "Analysis based on 49 observations spanning 9.2651 days (1999-Sep-30.16385 to 1999-Oct-09.42891)." Diameter approximately 0.053 km. from mean, weighted H=24.0.

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 8 April '08

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

2258Noted that JPL Sentry has removed 2008 GJ as an impact risk - see above
2158Noted that JPL Sentry has updated its 2007 UW1 risk assessment - see above
Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
2056Noted that JPL Sentry has updated its 1999 SF10 risk assessment - see above
2002Noted that JPL Sentry has posted 2008 GM2 as an impact risk - see above
1905Noted that JPL Sentry has updated its 2008 FF5 risk assessment - see above
1755Noted that JPL Sentry has updated its 2008 DB risk assessment - see above
Grabbed MPEC 2008-G45 - 2005 GC187 - see above
1634Noted that NEODyS has posted 2008 GM2 as an impact risk - see above
Grabbed MPEC 2008-G44 - Comets C/2007 L2, 2007 L3, 2007 L13, 2007 V4 (SOHO) - see above
1517Grabbed MPEC 2008-G43 - Daily Orbit Update - see above