Contents  on 29 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.

NEOCP Activity  on 29 February '08

The MPC's NEO Confirmation Page has 17 listings: 4 new, 13 updated

When last checked at 2355 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and thirteen updated listings. All of these were "one nighters." So far The Tracking News has counted a total of 28 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 29 February '08

Minor Planet Electronic Circulars

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


MPEC 2008-D61 - "14:29 UT" - 2008 DL5


MPEC 2008-D60 - "14:27 UT" - 2008 DK5


MPEC 2008-D59 - "14:25 UT" - 2008 DJ5


MPEC 2008-D58 - "14:21 UT" - 2008 DH5


MPEC 2008-D57 - "14:19 UT" - 2008 DG5


MPEC 2008-D56 - "14:16 UT" - 2008 DF5


<< DOU on 29 Feb. '08 >>  MPEC 2008-D55 - "07:08 UT" - Daily Orbit Update


MPEC 2008-D54 - "03:35 UT" - Comet P/2007 R1 (Larson)

Observers  on 29 February '08

A total of 21 observing facilities appear in today's MPECs.

CodeObserver / observatory
127Bornheim Obs. in Germany, 10 in MPEC 2008-D55 -- 2007 VQ4, 2007 TG8, 2005 TU45, 2005 EK70, 154347, 5131, 4954, 4450, 3288, 1620
703Catalina Sky Survey (CSS) in Arizona, 26 in MPECs 2008-D55, 2008-D57, 2008-D58, 2008-D60 & 2008-D61 -- 2008 DL5, 2008 DK5, 2008 DH5, 2008 DG5, 2008 CM, 2008 CL72, 2008 CD22, 2008 BT18, 2007 TG8, 2007 RV9, 2005 EA, 2005 BE2, 2002 CF26, 2001 MA8, 90403, 22099, 18736, 154347, 144922, 138175, 9400, 9162, 6456, 3691, 3552, 1864
448Desert Moon Obs. in New Mexico, 13 in MPEC 2008-D55 -- 2008 DD, 2008 DC, 2008 CS116, 2008 CR118, 2008 CR116, 2008 CL72, 2008 CL1, 2007 RV9, 2004 CR2, 2003 GS, 163693, 153591, 9856
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-D55 -- 162038
651Grasslands Obs. in Arizona, 3 in MPECs 2008-D56, 2008-D58 & 2008-D61 -- 2008 DL5, 2008 DH5, 2008 DF5
J95Great Shefford Obs. in England, 3 in MPECs 2008-D56, 2008-D58 & 2008-D61 -- 2008 DL5, 2008 DH5, 2008 DF5
H51Greiner Research Obs. in Wisconsin, 3 in MPEC 2008-D55 -- 2008 DJ, 2008 DG4, 2008 DD
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2008-D55 -- 2008 CR116, 2008 CL1, 2005 EK70, 2002 TD66
701Junk Bond Obs. in Arizona, 1 in MPEC 2008-D55 -- 2008 AZ110
704LINEAR in New Mexico, 16 in MPECs 2008-D55 & 2008-D56 -- 2008 DL4, 2008 DF5, 2008 CS116, 2008 CL72, 2005 EA, 2000 QY69, 2000 DP107, 2000 DK8, 85804, 175921, 174806, 170891, 152942, 4954, 1862, 1620
D35Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-D55 -- 138205
J40Malaga Obs. in Spain, 1 in MPEC 2008-D55 -- 1036
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2008-D54, 2008-D55, 2008-D56, 2008-D57, 2008-D58, 2008-D59, 2008-D60 & 2008-D61 -- 2008 DL5, 2008 DK5, 2008 DJ5, 2008 DH5, 2008 DG5, 2008 DF5, 2008 DC, 2008 CR118, 2008 CM, P/2007 R1, 2003 YQ94, 2000 DP107, 2000 CG59, 86067, 18736, 175921, 137099, 136618
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2008-D55 -- 2008 DJ, 2008 CN1, 2008 CL72, 2008 CL1, 2008 CD22, 2008 BT18, 2007 TU24, 2007 TG8, 2006 DU62, 2005 EK70, 2005 BE2, 2002 TD66, 2000 DP107, 11398
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2008-D55 -- 1864
204Schiaparelli Obs. in Italy, 1 in MPEC 2008-D54 -- P/2007 R1
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2008-D55 -- 2008 CS116, 2008 AL33, 2007 NS4, 2001 MR3, 2000 CG59, 175189, 141432, 9400, 3691
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2008-D55 & 2008-D57 -- 2008 DW, 2008 DJ, 2008 DG5, 2008 DB, 2008 DA4, 2008 CL116, 2008 CJ116, 2008 CH1, 2007 VJ184, 2007 MT20, 2002 VX91
6735Jim Young via Table Mtn. Obs. in southern California, 5 in MPECs 2008-D55, 2008-D56, 2008-D58, 2008-D60 & 2008-D61 -- 2008 DL5, 2008 DK5, 2008 DH5, 2008 DF5, 2007 TC23
6739Heath Rhoades via Table Mtn. Obs. in southern California, 1 in MPEC 2008-D56 -- 2008 DF5
G72University Hills Obs. in southern California, 5 in MPEC 2008-D55 -- 2008 CR116, 2008 CN1, 2008 CL1, 2007 TG8, 2006 DU62
J70Vega del Thader Obs. in Spain, 1 in MPEC 2008-D54 -- P/2007 R1

Impact Risk Monitoring  on 29 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.
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 DK5JPL Sentry22082011-21071141.3e-07-4.51-5.430JPL: "Analysis based on 12 observations spanning .97959 days (2008-Feb-28.48101 to 2008-Feb-29.460602)." Diameter approximately 0.235 km. from mean, weighted H=20.8.
2008 DJ5JPL Sentry22082013-2097237.7e-09-5.27-5.710JPL: "Analysis based on 12 observations spanning 1.0406 days (2008-Feb-28.40456 to 2008-Feb-29.44512)." Diameter approximately 0.380 km. from mean, weighted H=19.7.
2008 DG5JPL Sentry23552010-21062783.1e-07-3.50-4.180JPL: "Analysis based on 15 observations spanning 1.0647 days (2008-Feb-28.2778 to 2008-Feb-29.34249)." Diameter approximately 0.442 km. from mean, weighted H=19.4.
2008 DG4JPL Sentry22382069-208941.2e-07-6.40-6.690JPL: "Analysis based on 16 observations spanning 1.1589 days (2008-Feb-27.22883 to 2008-Feb-28.38775)." Diameter approximately 0.061 km. from mean, weighted H=23.7.
NEODyS15492062-208946.98e-08-6.63-6.950NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/02/27.230 to 2008/02/28.389."
2008 DA4JPL Sentry22082056-210491.1e-07-6.52-6.690JPL: "Analysis based on 19 observations spanning .93863 days (2008-Feb-27.28072 to 2008-Feb-28.21935)." Diameter approximately 0.052 km. from mean, weighted H=24.1.
NEODyS15492084-208754.84e-07-6.06-6.090NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2008/02/27.281 to 2008/02/28.220."
2008 DBNEODyS15492046-2089222.5e-05-5.01-5.080NEODyS: "Based on 53 optical observations (of which 2 are rejected as outliers) from 2008/02/18.243 to 2008/02/28.203."
JPL Sentry15482046-2108244.3e-05-4.78-4.850JPL: "Analysis based on 52 observations spanning 9.9601 days (2008-Feb-18.242 to 2008-Feb-28.20208)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2008 CL116JPL Sentry2355210215.5e-10-7.04-7.040JPL: "Analysis based on 70 observations spanning 18.004 days (2008-Feb-10.40671 to 2008-Feb-28.41025)." Diameter approximately 0.290 km. from mean, weighted H=20.3.

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 29 February '08

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

2355Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above
Noted that JPL Sentry has posted 2008 DG5 as an impact risk - see above
2238Noted that JPL Sentry has updated its 2008 DG4 risk assessment - see above
2208Noted that JPL Sentry has updated its 2008 DA4 risk assessment - see above
Noted that JPL Sentry has posted 2008 DJ5 as an impact risk - see above
Noted that JPL Sentry has posted 2008 DK5 as an impact risk - see above
1549Noted that NEODyS has updated its 2008 DA4 risk assessment - see above
Noted that NEODyS has updated its 2008 DB risk assessment - see above
Noted that NEODyS has updated its 2008 DG4 risk assessment - see above
Grabbed MPEC 2008-D55 - Daily Orbit Update - see above
1548Noted that JPL Sentry has updated its 2008 DB risk assessment - see above
Grabbed MPEC 2008-D56 - 2008 DF5 - see above
Grabbed MPEC 2008-D57 - 2008 DG5 - see above
Grabbed MPEC 2008-D58 - 2008 DH5 - see above
Grabbed MPEC 2008-D59 - 2008 DJ5 - see above
Grabbed MPEC 2008-D60 - 2008 DK5 - see above
Grabbed MPEC 2008-D61 - 2008 DL5 - see above
0528Grabbed MPEC 2008-D54 - Comet P/2007 R1 (Larson) - see above