Contents  on 2 April '08

Resources:

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 2 April '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. Of these, one was a "one nighter." So far The Tracking News has counted a total of five 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 2 April '08

Minor Planet Electronic Circulars

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


MPEC 2008-G15 - "21:35 UT" - Comets C/2007 F2, 2007 S5 (SOHO)


MPEC 2008-G14 - "16:15 UT" - 2008 GJ


MPEC 2008-G13 - "15:49 UT" - 2008 GH


MPEC 2008-G12 - "15:44 UT" - 2008 GG


<< DOU on 2 Apr. '08 >>  MPEC 2008-G11 - "06:08 UT" - Daily Orbit Update


MPEC 2008-G10 - "03:33 UT" - Comet P/1998 X1 = 2006 B7 (ODAS)

Observers  on 2 April '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 3 in MPECs 2008-G12, 2008-G13 & 2008-G14 -- 2008 GJ, 2008 GH, 2008 GG
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2008-G11 -- 2006 BG55
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2008-G11 -- 2008 ES, 2006 BG55, 68359, 40267, 22099, 16657, 152942, 144901, 4544
J95Great Shefford Obs. in England, 3 in MPECs 2008-G11 & 2008-G12 -- 2008 GG, 2008 FX6, 2008 FW6
H51Greiner Research Obs. (GRO) in Wisconsin, 2 in MPEC 2008-G11 -- 2008 FO, 2005 NB7
J34La Fecha Obs. in Spain, 3 in MPEC 2008-G11 -- 2008 DE, 2004 VW14, 4954
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-G10, 2008-G11, 2008-G12, 2008-G13 & 2008-G14 -- 2008 GJ, 2008 GH, 2008 GG, 2008 FN, 2008 EX84, P/2006 B7, 137084, 9400
J93Mt. Tuffley Obs. in England, 3 in MPEC 2008-G11 -- 4954, 3288, 1036
A13Naef Obs. in Switzerland, 1 in MPEC 2008-G11 -- 9162
A24New Millennium Obs. in Italy, 1 in MPEC 2008-G11 -- 2008 GD
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2008-G12 -- 2008 GG
C494HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 1 in MPEC 2008-G15 -- C/2007 F2
C495COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 2 in MPEC 2008-G15 -- C/2007 S5, C/2007 F2
C504HI1-B instrument (4) aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2008-G15 -- C/2007 S5
C505COR2-B instrument (5) aboard STEREO-B in heliocentric orbit trailing Earth, 2 in MPEC 2008-G15 -- C/2007 S5, C/2007 F2
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2008-G11 -- 2008 FS6, 2008 EE9, 2008 EE85, 2005 SR1, 2005 GE59, 2004 FE31, 2004 CR2, 162422, 152679, 10145, 1864
291Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2008-G11 -- 2008 FW6, 2008 FW5, 2008 FT6, 2008 FS6, 2008 FN, 2008 FH, 2008 FG, 2008 FF5, 2008 ER7, 2008 EB9, 2008 EA9, 2008 DL5, 2008 DK5, 2007 MR
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-G11 -- 2008 FE5
A48Verona Obs. in Italy, 3 in MPEC 2008-G11 -- 2008 EM85, 2007 VQ4, 2006 BG55
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 April '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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2008 GJJPL Sentry18562014-2103444.6e-08-4.67-5.410JPL: "Analysis based on 10 observations spanning .96108 days (2008-Apr-01.29788 to 2008-Apr-02.258963)." Diameter approximately 0.351 km. from mean, weighted H=19.9.
2008 GGJPL Sentry20082025-209791.2e-09-6.60-7.240JPL: "Analysis based on 17 observations spanning .92699 days (2008-Apr-01.27102 to 2008-Apr-02.19801)." Diameter approximately 0.213 km. from mean, weighted H=21.0.
2008 GFJPL Sentry0341201511.4e-10-6.72-6.720JPL: "Analysis based on 15 observations spanning .73741 days (2008-Apr-01.1933 to 2008-Apr-01.93071)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
2008 FK7NEODyS15002013-2085298.5e-09-6.68-7.030NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2008/03/31.402 to 2008/04/01.417."
2008 FW6JPL Sentry1459R E M O V E DJPL: Risk listing removed at 1241 UTC.
2008 FT6NEODyS15012011-2084151.92e-08-3.00-3.110NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008/03/29.380 to 2008/04/01.422."
JPL Sentry14592020-2093121.0e-08-3.77-4.000JPL: "Analysis based on 15 observations spanning 3.0421 days (2008-Mar-29.3796 to 2008-Apr-01.42174)." Diameter approximately 1.400 km. from mean, weighted H=16.9.
2008 FF5NEODyS15012029-208753.75e-07-4.76-5.060NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2008/03/28.323 to 2008/04/01.332."
JPL Sentry14592029-209574.0e-07-4.77-5.140JPL: "Analysis based on 41 observations spanning 4.0089 days (2008-Mar-28.32219 to 2008-Apr-01.33109)." Diameter approximately 0.080 km. from mean, weighted H=23.1.
2008 FNNEODyS15012020-2090242.61e-08-3.67-4.050NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2008/03/27.460 to 2008/04/01.513."
JPL Sentry14592020-2105172.3e-08-3.71-4.060JPL: "Analysis based on 35 observations spanning 5.0528 days (2008-Mar-27.45915 to 2008-Apr-01.51199)." Diameter approximately 0.751 km. from mean, weighted H=18.3.
2008 EA9NEODyS15012063-2088173.71e-05-6.13-6.670NEODyS: "Based on 56 optical observations (of which 1 are rejected as outliers) from 2008/03/06.406 to 2008/04/01.345."
JPL Sentry14592068-210583.1e-05-6.22-6.670JPL: "Analysis based on 55 observations spanning 25.938 days (2008-Mar-06.40551 to 2008-Apr-01.34377)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
2008 ER7NEODyS15012077-208934.27e-07-3.96-4.090NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/04/01.320."
JPL Sentry14592077-210483.5e-06-3.14-3.400JPL: "Analysis based on 71 observations spanning 25.983 days (2008-Mar-06.33608 to 2008-Apr-01.31941)." 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 2 April '08

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

2158Grabbed MPEC 2008-G15 - Comets C/2007 F2, 2007 S5 (SOHO) - see above
2008Noted that JPL Sentry has posted 2008 GG as an impact risk - see above
1856Noted that JPL Sentry has posted 2008 GJ as an impact risk - see above
1727Grabbed MPEC 2008-G14 - 2008 GJ - see above
1608Grabbed MPEC 2008-G12 - 2008 GG - see above
Grabbed MPEC 2008-G13 - 2008 GH - see above
1501Noted that NEODyS has updated its 2008 EA9 risk assessment - see above
Noted that NEODyS has updated its 2008 ER7 risk assessment - see above
Noted that NEODyS has updated its 2008 FF5 risk assessment - see above
Noted that NEODyS has updated its 2008 FN risk assessment - see above
Noted that NEODyS has updated its 2008 FT6 risk assessment - see above
1500Grabbed MPEC 2008-G11 - Daily Orbit Update - see above
1459Noted that JPL Sentry has updated its 2008 EA9 risk assessment - see above
Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above
Noted that JPL Sentry has updated its 2008 FF5 risk assessment - see above
Noted that NEODyS has posted 2008 FK7 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 FN risk assessment - see above
Noted that JPL Sentry has updated its 2008 FT6 risk assessment - see above
Noted that JPL Sentry has removed 2008 FW6 as an impact risk - see above
0554Grabbed MPEC 2008-G10 - Comet P/1998 X1 = 2006 B7 (ODAS) - see above
0341Noted that JPL Sentry has posted 2008 GF as an impact risk - see above