Contents  on 3 February '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.

Radar Astrometry  on 3 February '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:


Data addition noted at 0538 UTC when the database was dated 2 Feb.

NEOCP Activity  on 3 February '08

The MPC's NEO Confirmation Page has 12 listings: 1 new, 11 updated

When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and eleven updated listings. Of these, three 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 3 February '08

Minor Planet Electronic Circulars

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


<< DOU on 3 Feb. '08 >>  MPEC 2008-C17 - "07:08 UT" - Daily Orbit Update


MPEC 2008-C16 - "03:59 UT" - Comet C/2008 C1 (Chen-Gao)

Observers  on 3 February '08

A total of 26 observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2008-C16 -- C/2008 C1
251Arecibo in Puerto Rico, 2 in radar -- 2007 TU24, 2007 TU24
726Brainerd Obs. in Minnesota, 1 in MPEC 2008-C17 -- 2005 TU45
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-C17 -- 2007 US6, 138175
970Chelmsford Obs. in England, 1 in MPEC 2008-C17 -- 2007 TU24
448Desert Moon Obs. in New Mexico, 3 in MPEC 2008-C17 -- 2007 YF1, 2007 XJ20, 162173
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2008-C16 -- C/2008 C1
151Eschenberg Obs. in Switzerland, 4 in MPEC 2008-C17 -- 2008 BT18, 2008 BD15, 2004 AR1, 1998 BB10
B21Gaisberg Obs. in Austria, 1 in MPEC 2008-C17 -- 2008 CQ
256Green Bank in West Virginia, 1 in radar -- 2007 TU24
A17Guidestar Obs. in Germany, 2 in MPEC 2008-C17 -- 2008 CP, 2008 CO
A21Irmtraut Obs. in Germany, 1 in MPEC 2008-C16 -- C/2008 C1
G92Jarnac Obs. in Arizona, 1 in MPEC 2008-C17 -- 7889
704LINEAR in New Mexico, 8 in MPEC 2008-C17 -- 2008 CH, 2008 CG, 2008 AF4, 173561, 170891, 162038, 143678, 5131
J87La Canada Obs. in Spain, 1 in MPEC 2008-C16 -- C/2008 C1
711McDonald Obs. in Texas, 8 in MPEC 2008-C17 -- 2008 BU2, 2008 AN33, 2008 AM33, 2007 SP6, 2007 EH88, 2004 DC, 1993 TQ2, 162433
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-C17 -- 4450
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2008-C17 -- 2008 BQ16, 2008 BP16, 2004 BG121, 138205
A13Naef Obs. in Switzerland, 3 in MPEC 2008-C17 -- 2008 CO, 162173, 3553
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2008-C16 -- C/2008 C1
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-C16 -- C/2008 C1
204Schiaparelli Obs. in Italy, 1 in MPEC 2008-C16 -- C/2008 C1
510Siegen Obs. in Germany, 2 in MPEC 2008-C17 -- 2007 TU24, 4954
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2008-C17 -- 2008 BO16, 22099
B30Szamotuly-Galowo Obs. in Poland, 1 in MPEC 2008-C16 -- C/2008 C1
H53Thompsonville Obs. in Illinois, 6 in MPEC 2008-C17 -- 99935, 96189, 90403, 86324, 154347, 138013

Impact Risk Monitoring  on 3 February '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 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 CJNEODyS15502028-208374.44e-08-8.29-8.630NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/02/02.247 to 2008/02/02.430."
2008 BT18JPL Sentry15502011-2106961.9e-07-3.33-3.820JPL: "Analysis based on 17 observations spanning 2.4286 days (2008-Jan-31.41308 to 2008-Feb-02.84171)." Diameter approximately 0.731 km. from mean, weighted H=18.3.
NEODyS15502011-2088621.02e-07-3.51-4.050NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/01/31.414 to 2008/02/02.842."
2008 BO16JPL Sentry15502041-207941.4e-06-4.38-4.440JPL: "Analysis based on 20 observations spanning 2.9057 days (2008-Jan-30.38083 to 2008-Feb-02.28652)." Diameter approximately 0.085 km. from mean, weighted H=23.0.
NEODyS15502045-207951.37e-06-4.38-4.450NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/01/30.382 to 2008/02/02.287."
2008 BD15JPL Sentry1550204212.6e-08-5.27-5.270JPL: "Analysis based on 61 observations spanning 3.4527 days (2008-Jan-30.31301 to 2008-Feb-02.7657)." Diameter approximately 0.230 km. from mean, weighted H=20.9.
2008 AF4JPL Sentry15502078-2105312.6e-05-2.32-2.850JPL: "Analysis based on 349 observations spanning 22.924 days (2008-Jan-10.39652 to 2008-Feb-02.32076)." Diameter approximately 0.380 km. from mean, weighted H=19.8.
NEODyS15502067-2090236.04e-06-2.91-3.120NEODyS: "Based on 353 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/02.322."

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 3 February '08

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

1550Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has updated its 2008 BD15 risk assessment - see above
Noted that JPL Sentry has updated its 2008 BO16 risk assessment - see above
Noted that NEODyS has updated its 2008 BO16 risk assessment - see above
Noted that JPL Sentry has updated its 2008 BT18 risk assessment - see above
Noted that NEODyS has updated its 2008 BT18 risk assessment - see above
Noted that NEODyS has posted 2008 CJ as an impact risk - see above
Grabbed MPEC 2008-C17 - Daily Orbit Update - see above
0538Noted Radar Astrometry database addition - see above
0537Grabbed MPEC 2008-C16 - Comet C/2008 C1 (Chen-Gao) - see above