Contents  on 28 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 28 February '08

The MPC's NEO Confirmation Page has 14 listings: 2 new, 12 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and twelve updated listings. All of these were "one nighters." So far The Tracking News has counted a total of 25 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 28 February '08

Minor Planet Electronic Circulars

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


MPEC 2008-D53 - "18:06 UT" - 2007 YY59


MPEC 2008-D52 - "15:41 UT" - 2008 DL4


MPEC 2008-D51 - "12:37 UT" - 2008 AZ110


<< DOU on 28 Feb. '08 >>  MPEC 2008-D50 - "07:07 UT" - Daily Orbit Update


MPEC 2008-D49 - "01:39 UT" - 2008 DG4

Observers  on 28 February '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 3 in MPEC 2008-D50 -- 2008 BD15, 2008 AV28, 2006 BG
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2008-D50, 2008-D51 & 2008-D52 -- 2008 DL4, 2008 CS116, 2008 AZ110, 2005 EA, 1620
448Desert Moon Obs. in New Mexico, 5 in MPEC 2008-D50 -- 2008 DE, 2008 CM, 2008 CL1, 2008 CJ119, 2008 CH
143Gnosca Obs. in Switzerland, 1 in MPEC 2008-D49 -- 2008 DG4
A57Hack Obs. in Italy, 1 in MPEC 2008-D50 -- 96189
704LINEAR in New Mexico, 19 in MPEC 2008-D50 -- 2008 DY, 2008 CP116, 2008 BC22, 2005 TU45, 2004 CR2, 2002 TD66, 2000 DK8, 86324, 18736, 177049, 175921, 170891, 138205, 9400, 5131, 4544, 3691, 3554, 1620
699LONEOS in Arizona, 4 in MPECs 2008-D49 & 2008-D50 -- 2008 DG4, 22099, 175921, 138205
J40Malaga Obs. in Spain, 1 in MPEC 2008-D50 -- 2008 DJ
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2008-D50, 2008-D51 & 2008-D52 -- 2008 DL4, 2008 AZ110, 3908
J47Nazaret Obs. in Spain, 1 in MPEC 2008-D50 -- 2008 DJ
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 15 in MPEC 2008-D50 -- 2008 DJ, 2008 CN1, 2008 CL1, 2008 CD22, 2008 BT18, 2008 AE, 2007 TU24, 2007 TG8, 2007 RX19, 2006 DU62, 2005 EK70, 2005 BE2, 2000 DP107, 175921, 1620
461SZTE Asteroid Program in Hungary, 1 in MPEC 2008-D50 -- 2008 DG4
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-D50 -- 2008 AX1, 2007 YM1
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2008-D50, 2008-D51 & 2008-D53 -- 2008 BV2, 2008 BC22, 2008 AZ110, 2007 YY59, 13553
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2008-D50, 2008-D51 & 2008-D53 -- 2008 CM116, 2008 CL116, 2008 CE6, 2008 CB175, 2008 AZ110, 2007 YY59, 2007 MT20, 2005 SR1
A97Stammersdorf Obs. in Austria, 2 in MPEC 2008-D50 -- 153591, 1620
6735Jim Young via Table Mtn. Obs. in southern California, 3 in MPECs 2008-D49 & 2008-D50 -- 2008 DG4, 2008 CJ70, 2005 EA

Impact Risk Monitoring  on 28 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 DG4JPL Sentry15552062-209565.8e-08-6.65-7.050JPL #2 for the day: "Analysis based on 13 observations spanning .83369 days (2008-Feb-27.22883 to 2008-Feb-28.06252)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
NEODyS15552085-208933.6e-08-6.86-7.120NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2008/02/27.230 to 2008/02/28.063."
2008 DA4NEODyS15552015-2087281.04e-07-6.30-6.640NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/02/27.281 to 2008/02/27.441."
2008 DYJPL Sentry1555R E M O V E DJPL: Risk listing removed at 1117 UTC.
2008 DVNEODyS15552011-2090112.56e-09-4.22-4.460NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2008/02/26.121 to 2008/02/27.145."
2008 DJNEODyS1555R E M O V E D
2008 CL116JPL Sentry1555210211.3e-08-5.65-5.650JPL: "Analysis based on 67 observations spanning 16.956 days (2008-Feb-10.40671 to 2008-Feb-27.36239)." 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 28 February '08

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

1831Grabbed MPEC 2008-D53 - 2007 YY59 - see above
1555Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above
Noted that NEODyS has posted 2008 DA4 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 DG4 risk assessment - see above
Noted that NEODyS has posted 2008 DG4 as an impact risk - see above
Noted that NEODyS has removed 2008 DJ as an impact risk - see above
Noted that NEODyS has posted 2008 DV as an impact risk - see above
Noted that JPL Sentry has removed 2008 DY as an impact risk - see above
Grabbed MPEC 2008-D50 - Daily Orbit Update - see above
Grabbed MPEC 2008-D51 - 2008 AZ110 - see above
Grabbed MPEC 2008-D52 - 2008 DL4 - see above
0402Noted that JPL Sentry has posted 2008 DG4 as an impact risk - see above
0241Grabbed MPEC 2008-D49 - 2008 DG4 - see above