Contents  on 16 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 16 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 0105 UTC when the database was dated 15 Feb.

NEOCP Activity  on 16 February '08

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

When last checked at 2354 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 eight 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 16 February '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-D04 - "21:41 UT" - 2007 DA


MPEC 2008-D03 - "18:30 UT" - 2008 CC175


MPEC 2008-D02 - "18:27 UT" - 2008 CB175


<< DOU on 16 Feb. '08 >>  MPEC 2008-D01 - "07:10 UT" - Daily Orbit Update

Observers  on 16 February '08

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J94Abbeydale Obs., 2 in MPEC 2008-D01 -- 170891, 153591
251Arecibo in Puerto Rico, 2 in radar -- 153591, 4450
300Bisei Spaceguard Center (Bisei) in Japan, 5 in MPEC 2008-D01 -- 2007 TU24, 2005 TU45, 2005 EK70, 2005 BE2, 162173
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2008-D02 & 2008-D03 -- 2008 CC175, 2008 CB175
J95Great Shefford Obs. in England, 11 in MPECs 2008-D01, 2008-D02, 2008-D03 & 2008-D04 -- 2008 CZ21, 2008 CS1, 2008 CR118, 2008 CP, 2008 CL116, 2008 CE22, 2008 CC71, 2008 CC175, 2008 CB6, 2008 CB175, 2007 DA
A17Guidestar Obs. in Germany, 4 in MPEC 2008-D01 -- 2008 CN1, 2008 CH, 2008 CC71, 2007 RV9
355Hadano Obs. in Japan, 9 in MPEC 2008-D01 -- 2008 CN1, 2008 CL1, 2008 AF4, 2008 AE, 2007 YK, 2007 TU24, 2007 TG8, 2005 TU45, 2005 EK70
B15Inastars Obs. in Germany, 2 in MPEC 2008-D01 -- 2008 BP16, 22099
130Lumezzane Obs. in Italy, 9 in MPEC 2008-D01 -- 2008 CL1, 2008 CK70, 2006 JY25, 2005 BE2, 2003 AK18, 2002 CF26, 162510, 152942, 144901
D62Miyaki-Argenteus Obs. in Japan, 1 in MPEC 2008-D01 -- 2007 YZ
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-D02 -- 2008 CB175
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-D01 -- 2006 DU62, 36236
510Siegen Obs. in Germany, 8 in MPEC 2008-D01 -- 2007 TG8, 2005 TU45, 2005 EK70, 170891, 153591, 4954, 4450, 3288
A78Stia Obs. in Italy, 5 in MPEC 2008-D01 -- 2008 CN1, 2008 CL1, 2007 YK, 2002 CF26, 153591
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-D02 -- 2008 CB175

Impact Risk Monitoring  on 16 February '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 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 CR118JPL Sentry1632201912.6e-10-6.20-6.200JPL: "Analysis based on 12 observations spanning 5.7948 days (2008-Feb-10.3515 to 2008-Feb-16.14628)." Diameter approximately 0.550 km. from mean, weighted H=19.0.
NEODyS1632R E M O V E D
2008 CL116NEODyS16332026-2089108.59e-08-4.70-4.900NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2008/02/10.407 to 2008/02/16.180."
JPL Sentry16322035-2107101.7e-07-4.43-4.860JPL: "Analysis based on 50 observations spanning 5.7725 days (2008-Feb-10.40671 to 2008-Feb-16.17923)." Diameter approximately 0.299 km. from mean, weighted H=20.3.
2008 CC71NEODyS16332034-2089361.07e-04-3.97-4.130NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2008/02/09.397 to 2008/02/16.162."
JPL Sentry16322033-205691.7e-05-4.56-4.760JPL: "Analysis based on 26 observations spanning 6.7648 days (2008-Feb-09.39625 to 2008-Feb-16.16108)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2008 CK70NEODyS16332030-203242.79e-04-3.19-3.190NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2008/02/09.342 to 2008/02/14.007."
JPL Sentry16322030-203122.9e-04-3.18-3.180JPL: "Analysis based on 77 observations spanning 4.6648 days (2008-Feb-09.34106 to 2008-Feb-14.00589)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
2008 CB6JPL Sentry16322093-210731.1e-05-6.37-6.510JPL: "Analysis based on 35 observations spanning 8.7528 days (2008-Feb-07.29202 to 2008-Feb-16.04487)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS16322066-208724.73e-08-8.58-8.830NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2008/02/07.293 to 2008/02/16.046."
2008 CS1JPL Sentry1632R E M O V E DJPL: Risk listing removed at 1150 UTC.
NEODyS1632R E M O V E D
2008 AF4NEODyS16332078-2090111.49e-05-2.50-2.541NEODyS: "Based on 515 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/13.928. NOTE: The Virtual Impactor in 2089/01/09.483 in the table above is rated as Torino Scale 1."
JPL Sentry16322078-2099212.0e-05-2.38-2.531JPL: "Analysis based on 511 observations spanning 34.531 days (2008-Jan-10.39652 to 2008-Feb-13.92722)." Diameter approximately 0.390 km. from mean, weighted H=19.7.

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 16 February '08

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

2157Grabbed MPEC 2008-D04 - 2007 DA - see above
1942Grabbed MPEC 2008-D02 - 2008 CB175 - see above
Grabbed MPEC 2008-D03 - 2008 CC175 - see above
1633Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
Noted that NEODyS has updated its 2008 CC71 risk assessment - see above
Noted that NEODyS has updated its 2008 CK70 risk assessment - see above
Noted that NEODyS has updated its 2008 CL116 risk assessment - see above
1632Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has updated its 2008 CB6 risk assessment - see above
Noted that NEODyS has updated its 2008 CB6 risk assessment - see above
Noted that JPL Sentry has updated its 2008 CC71 risk assessment - see above
Noted that JPL Sentry has updated its 2008 CK70 risk assessment - see above
Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above
Noted that JPL Sentry has updated its 2008 CR118 risk assessment - see above
Noted that NEODyS has removed 2008 CR118 as an impact risk - see above
Noted that JPL Sentry has removed 2008 CS1 as an impact risk - see above
Noted that NEODyS has removed 2008 CS1 as an impact risk - see above
Grabbed MPEC 2008-D01 - Daily Orbit Update - see above
0105Noted Radar Astrometry database addition - see above