Contents  on 25 April '08

Resources:

NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, for the rest of April.

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 25 April '08

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2314 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of three 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 25 April '08

Minor Planet Electronic Circulars

As of last check at 2314 UTC, there have been three MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-H27 - "20:57 UT" - 2008 HK


MPEC 2008-H26 - "20:51 UT" - 2008 HJ


<< DOU on 25 Apr. '08 >>  MPEC 2008-H25 - "06:06 UT" - Daily Orbit Update

Observers  on 25 April '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2008-H25 -- 2008 HE
H55Astronomical Research Obs. (ARO) in Illinois, 13 in MPEC 2008-H25 -- 2008 GS3, 2008 GO20, 2008 GJ110, 2008 GH110, 2008 GF, 2008 GE110, 2008 GE, 2008 GC110, 2008 GA110, 2008 ER7, 2008 EM9, 2008 DW, 2008 DJ
300Bisei Spaceguard Center in Japan, 1 in MPEC 2008-H26 -- 2008 HJ
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2008-H25 & 2008-H27 -- 2008 HK, 2008 FN6, 2006 UA, 2000 DP107, 1998 KG3, 86667, 152679, 138205, 13553, 1864
448Desert Moon Obs. in New Mexico, 8 in MPEC 2008-H25 -- 2008 HE, 2008 GJ110, 2008 GH110, 2008 GC110, 2008 GB110, 2008 GA4, 2008 FN6, 2006 UA
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2008-H26 & 2008-H27 -- 2008 HK, 2008 HJ
F653FTP education program via Faulkes Telescope North in Hawaii, 2 in MPEC 2008-H25 -- 2008 HH, 2008 HG
704LINEAR in New Mexico, 9 in MPECs 2008-H25 & 2008-H26 -- 2008 HJ, 2008 HG, 2008 HE, 2008 FN6, 2006 UA, 2004 CR2, 54789, 13553, 1685
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-H25 & 2008-H26 -- 2008 HJ, 2008 GA4, 2008 FN, 2004 FE31, 2002 RU25, 86667, 13553, 7822
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2008-H25 -- 2005 NB7, 2003 GW, 184266, 152942
473Remanzacco Obs. in Italy, 3 in MPECs 2008-H25, 2008-H26 & 2008-H27 -- 2008 HK, 2008 HJ, 2008 EC69
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2008-H26 & 2008-H27 -- 2008 HK, 2008 HJ
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-H25 -- 152679
291Spacewatch 1.8m telescope in Arizona, 16 in MPEC 2008-H25 -- 2008 HE, 2008 GV20, 2008 GS3, 2008 GR3, 2008 GO20, 2008 GG2, 2008 GE1, 2008 GE, 2008 GC110, 2008 GA4, 2008 GA110, 2008 FG, 2008 DW, 2008 CB22, 2004 JQ1, 2003 KO2
F85Tiki Obs. in Tahiti, 2 in MPEC 2008-H25 -- 2008 HG, 2008 GU20
A48Verona Obs. in Italy, 3 in MPEC 2008-H25 -- 2008 GV3, 2008 DE, 2007 VQ4
198Wildberg Obs. in Germany, 4 in MPECs 2008-H25 & 2008-H27 -- 2008 HK, 2008 FN6, 2008 EQ7, 170891
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2314 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 HJJPL Sentry23142071-2106331.4e-04-4.49-5.150JPL: "Analysis based on 23 observations spanning 1.5677 days (2008-Apr-24.24725 to 2008-Apr-25.81497)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2008 HHNEODyS21412010-2089862.82e-08-5.40-6.020NEODyS #2: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2008/04/24.309 to 2008/04/24.581."
2008 HGJPL Sentry2139R E M O V E DJPL: Risk listing removed at 1655 UTC.
2008 HENEODyS1214R E M O V E D-
2008 ER7JPL Sentry21392077-210269.7e-07-3.66-4.080JPL: "Analysis based on 90 observations spanning 48.805 days (2008-Mar-06.33608 to 2008-Apr-24.140763)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
NEODyS12152073-208664.4e-07-3.93-4.140NEODyS: "Based on 90 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/04/24.142."
2007 VD8JPL Sentry21392023-2107733.1e-07-7.74-8.690JPL: "Analysis based on 11 observations spanning .11380 days (2007-Nov-05.31632 to 2007-Nov-05.43012)." 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 25 April '08

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

2314Noted that JPL Sentry has posted 2008 HJ as an impact risk - see above
2141Noted that NEODyS has updated its 2008 HH risk assessment - see above
2139Noted that JPL Sentry has updated its 2007 VD8 risk assessment - see above
Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above
Noted that JPL Sentry has removed 2008 HG as an impact risk - see above
Grabbed MPEC 2008-H26 - 2008 HJ - see above
Grabbed MPEC 2008-H27 - 2008 HK - see above
1215Noted that NEODyS has updated its 2008 ER7 risk assessment - see above
Grabbed MPEC 2008-H25 - Daily Orbit Update - see above
1214Noted that NEODyS has removed 2008 HE as an impact risk - see above
Noted that NEODyS has posted 2008 HH as an impact risk - see above
The NEOCP has become active