Contents  on 1 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 1 April '08

The MPC's NEO Confirmation Page has 5 listings: 5 updated

When last checked at 2355 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of seventeen 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 1 April '08

Minor Planet Electronic Circulars

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


MPEC 2008-G09 - "23:11 UT" - 2008 GF


MPEC 2008-G08 - "22:14 UT" - 2008 GE


MPEC 2008-G07 - "21:19 UT" - 2008 GD


MPEC 2008-G06 - "14:22 UT" - 2008 FL7


MPEC 2008-G05 - "14:19 UT" - 2008 FK7


MPEC 2008-G04 - "14:16 UT" - 2008 FJ7


MPEC 2008-G03 - "14:07 UT" - 2004 FG11


<< DOU on 1 Apr. '08 >>  MPEC 2008-G02 - "06:07 UT" - Daily Orbit Update


MPEC 2008-G01 - "00:29 UT" - 2007 HR

Observers  on 1 April '08

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 5 in MPEC 2008-G02 -- 2007 VQ4, 153591, 5836, 3288, 1864
E18BDI Obs. in New South Wales, 1 in MPEC 2008-G02 -- 1998 SF35
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2008-G01, 2008-G02 & 2008-G03 -- 2008 ES, 2008 CZ118, 2008 CB22, 2008 BT18, 2007 TU24, 2007 HR, 2004 FG11
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2008-G02 -- 2006 BG55
J95Great Shefford Obs. in England, 5 in MPECs 2008-G01, 2008-G02, 2008-G07, 2008-G08 & 2008-G09 -- 2008 GF, 2008 GE, 2008 GD, 2008 EW5, 2007 HR
246KLENOT in the Czech Republic, 4 in MPECs 2008-G01 & 2008-G02 -- 2008 FO, 2008 FF5, 2008 EE85, 2007 HR
J34La Fecha Obs. in Spain, 2 in MPEC 2008-G02 -- 2008 DE, 2005 BE2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-G02 -- 2008 ER90
118Modra Obs. in Slovakia, 5 in MPECs 2008-G01, 2008-G02, 2008-G03 & 2008-G07 -- 2008 GD, 2008 FN, 2008 EM85, 2007 HR, 2004 FG11
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2008-G01, 2008-G02, 2008-G04, 2008-G05, 2008-G06, 2008-G07 & 2008-G08 -- 2008 GE, 2008 GD, 2008 FL7, 2008 FK7, 2008 FJ7, 2008 ET7, 2008 EA32, 2008 CD22, 2007 HR, 2004 FN32, 180186
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 4 in MPECs 2008-G03, 2008-G07, 2008-G08 & 2008-G09 -- 2008 GF, 2008 GE, 2008 GD, 2004 FG11
461SZTE Asteroid Program in Hungary, 1 in MPEC 2008-G02 -- 2008 EA32
854Sabino Canyon Obs. in Arizona, 5 in MPECs 2008-G01, 2008-G03, 2008-G07, 2008-G08 & 2008-G09 -- 2008 GF, 2008 GE, 2008 GD, 2007 HR, 2004 FG11
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2008-G07 -- 2008 GD
204Schiaparelli Obs. in Italy, 1 in MPEC 2008-G07 -- 2008 GD
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2008-G02 & 2008-G09 -- 2008 GF, 2008 ET7, 2008 EE9, 2005 GE59
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2008-G02, 2008-G05 & 2008-G09 -- 2008 GF, 2008 FW5, 2008 FN, 2008 FK7, 2008 FK, 2008 FF5, 2008 EE9, 2008 EA9, 2007 XT3
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2008-G03 & 2008-G07 -- 2008 GD, 2004 FG11
F85Tiki Obs. in Tahiti, 2 in MPECs 2008-G01 & 2008-G03 -- 2007 HR, 2004 FG11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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.
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 FL7JPL Sentry1717210411.4e-10-9.86-9.860JPL: "Analysis based on 12 observations spanning 1.0158 days (2008-Mar-31.44407 to 2008-Apr-01.45986)." Diameter approximately 0.043 km. from mean, weighted H=24.5.
2008 FK7JPL Sentry17172015-2107331.8e-08-6.66-7.130JPL: "Analysis based on 13 observations spanning 1.0146 days (2008-Mar-31.40145 to 2008-Apr-01.41606)." Diameter approximately 0.079 km. from mean, weighted H=23.2.
2008 FT6NEODyS14392011-2090146.38e-09-3.48-3.610NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/03/29.380 to 2008/03/31.318."
2008 FW5JPL Sentry1435R E M O V E DJPL: Risk listing removed at 1010 UTC.
2008 FF5NEODyS14392029-208763.79e-07-4.82-5.270NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2008/03/28.323 to 2008/03/31.859."
JPL Sentry14352029-210094.2e-07-4.81-5.340JPL: "Analysis based on 39 observations spanning 3.5357 days (2008-Mar-28.32219 to 2008-Mar-31.8579)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
2008 FNNEODyS14392020-2089339.04e-08-3.15-3.710NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2008/03/27.460 to 2008/04/01.132."
JPL Sentry14352020-2105339.5e-08-3.14-3.680JPL: "Analysis based on 28 observations spanning 4.6719 days (2008-Mar-27.45915 to 2008-Apr-01.13101)." Diameter approximately 0.753 km. from mean, weighted H=18.3.
2008 EA9NEODyS14392051-2090284.35e-05-6.06-6.640NEODyS: "Based on 54 optical observations (of which 1 are rejected as outliers) from 2008/03/06.406 to 2008/03/31.270."
JPL Sentry14352068-210593.4e-05-6.18-6.640JPL: "Analysis based on 53 observations spanning 24.863 days (2008-Mar-06.40551 to 2008-Mar-31.26889)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

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 1 April '08

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

2355Grabbed MPEC 2008-G07 - 2008 GD - see above
Grabbed MPEC 2008-G08 - 2008 GE - see above
Grabbed MPEC 2008-G09 - 2008 GF - see above
1717Noted that JPL Sentry has posted 2008 FK7 as an impact risk - see above
Noted that JPL Sentry has posted 2008 FL7 as an impact risk - see above
1439Noted that NEODyS has updated its 2008 EA9 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
Grabbed MPEC 2008-G02 - Daily Orbit Update - see above
1435Noted that JPL Sentry has updated its 2008 EA9 risk assessment - see above
Noted that JPL Sentry has updated its 2008 FF5 risk assessment - see above
Noted that JPL Sentry has updated its 2008 FN risk assessment - see above
Noted that NEODyS has posted 2008 FT6 as an impact risk - see above
Noted that JPL Sentry has removed 2008 FW5 as an impact risk - see above
Grabbed MPEC 2008-G03 - 2004 FG11 - see above
Grabbed MPEC 2008-G04 - 2008 FJ7 - see above
Grabbed MPEC 2008-G05 - 2008 FK7 - see above
Grabbed MPEC 2008-G06 - 2008 FL7 - see above
0126Grabbed MPEC 2008-G01 - 2007 HR - see above