Contents  on 19 February '08


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Radar Astrometry  on 19 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 2356 UTC when the database was dated 19 Feb.

NEOCP Activity  on 19 February '08

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2355 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.

New MPECs  on 19 February '08

Minor Planet Electronic Circulars

As of last check at 2355 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-D16 - "16:16 UT" - 2008 DD

MPEC 2008-D15 - "16:12 UT" - 2008 DC

MPEC 2008-D14 - "16:09 UT" - 2008 DB

<< DOU on 19 Feb. '08 >>  MPEC 2008-D13 - "07:08 UT" - Daily Orbit Update

Observers  on 19 February '08

A total of 20 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 6 in MPEC 2008-D13 -- 2008 CY4, 2008 CO116, 2008 CK116, 2008 CD71, 2008 CD22, 2008 CB22
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2008-D13 -- 2008 CN1, 4544
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2008-D13, 2008-D14, 2008-D15 & 2008-D16 -- 2008 DD, 2008 DC, 2008 DB, 2008 CR116, 2008 CL1, 2008 AE, 2007 TU24, 162510
448Desert Moon Obs. in New Mexico, 7 in MPEC 2008-D13 -- 2008 CR118, 2008 CN70, 2008 CM, 2008 CD71, 2008 CC6, 2008 CC22, 163693
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2008-D14, 2008-D15 & 2008-D16 -- 2008 DD, 2008 DC, 2008 DB
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2006 RH120
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2006 RH120
-25Goldstone DSS-25 34m antenna in southern California, 1 in radar -- 2006 RH120
J95Great Shefford Obs. in England, 3 in MPECs 2008-D14, 2008-D15 & 2008-D16 -- 2008 DD, 2008 DC, 2008 DB
A17Guidestar Obs. in Germany, 3 in MPECs 2008-D13 & 2008-D14 -- 2008 DB, 2008 CN1, 2002 TD66
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-D13 -- 2008 CL1, 2005 EK70
E14Hunters Hill Obs. in Australian Capital Territory, 1 in MPEC 2008-D13 -- 1620
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2008-D13 & 2008-D15 -- 2008 DC, 2007 NS4, 2000 QY69, 2000 DP107, 9856
J69North Obs. in England, 1 in MPEC 2008-D13 -- 2008 CN1
473Remanzacco Obs. in Italy, 1 in MPEC 2008-D14 -- 2008 DB
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2008-D14 & 2008-D16 -- 2008 DD, 2008 DB
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-D13 -- 2007 VL243, 2007 PR9
926Tenagra II Obs. in Arizona, 1 in MPEC 2008-D13 -- 9400
231Vesqueville Obs. in Belgium, 1 in MPEC 2008-D13 -- 4450
198Wildberg Obs. in Germany, 1 in MPEC 2008-D13 -- 2008 AF4

Impact Risk Monitoring  on 19 February '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 DBJPL Sentry20322032-2106454.1e-05-4.78-4.840JPL: "Analysis based on 34 observations spanning 1.1675 days (2008-Feb-18.242 to 2008-Feb-19.40948)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2008 CR118JPL Sentry2200R E M O V E DJPL: Risk listing removed at 2143 UTC.
2008 CL116JPL Sentry22002078-210251.7e-07-4.45-4.890JPL: "Analysis based on 57 observations spanning 6.6665 days (2008-Feb-10.40671 to 2008-Feb-17.07319)." Diameter approximately 0.300 km. from mean, weighted H=20.3.
2008 AF4JPL Sentry22002078-2101251.8e-05-2.44-2.680JPL: "Analysis based on 547 observations spanning 39.399 days (2008-Jan-10.39652 to 2008-Feb-18.79565)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
NEODyS15562078-209091.17e-05-2.59-2.680NEODyS: "Based on 551 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/18.796."

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 19 February '08

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

2356Noted Radar Astrometry database addition - see above
2200Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above
Noted that JPL Sentry has removed 2008 CR118 as an impact risk - see above
2032Noted that JPL Sentry has posted 2008 DB as an impact risk - see above
1659Grabbed MPEC 2008-D14 - 2008 DB - see above
Grabbed MPEC 2008-D15 - 2008 DC - see above
Grabbed MPEC 2008-D16 - 2008 DD - see above
1556Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
Grabbed MPEC 2008-D13 - Daily Orbit Update - see above