Contents  on 27 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 27 February '08

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and four updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of fourteen 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 27 February '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been nine MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-D48 - "22:10 UT" - 2007 TK422, 2007 VJ305


MPEC 2008-D47 - "17:56 UT" - 2008 DA4


MPEC 2008-D46 - "12:33 UT" - 2008 DY


MPEC 2008-D45 - "12:29 UT" - 2008 DX


MPEC 2008-D44 - "12:26 UT" - 2008 DW


MPEC 2008-D43 - "12:23 UT" - 2008 DV


<< DOU on 27 Feb. '08 >>  MPEC 2008-D42 - "07:07 UT" - Daily Orbit Update


MPEC 2008-D41 - "03:06 UT" - 2008 BC22


MPEC 2008-D40 - "00:07 UT" - 2007 UM126

Observers  on 27 February '08

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

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPEC 2008-D42 -- 2008 DJ, 2008 AF4
705Apache Point Obs. in New Mexico, 3 in MPECs 2008-D40 & 2008-D48 -- 2007 VJ305, 2007 UM126, 2007 TK422
726Brainerd Obs. in Minnesota, 3 in MPEC 2008-D42 -- 2008 CN1, 2005 EK70, 2002 TD66
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-D47 -- 2008 DA4
734Farpoint Obs. in Kansas, 3 in MPECs 2008-D44, 2008-D45 & 2008-D46 -- 2008 DY, 2008 DX, 2008 DW
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-D42 -- 162038
J95Great Shefford Obs. in England, 5 in MPECs 2008-D41, 2008-D42, 2008-D43, 2008-D44 & 2008-D45 -- 2008 DX, 2008 DW, 2008 DV, 2008 DJ, 2008 BC22
246KLENOT in the Czech Republic, 2 in MPEC 2008-D42 -- 2008 CP116, 2008 CD71
704LINEAR in New Mexico, 10 in MPECs 2008-D42 & 2008-D46 -- 2008 DY, 2008 DJ, 2008 CP116, 2005 TU45, 2004 XP164, 7977, 6455, 4544, 3691, 3554
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-D42 -- 2008 DJ
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2008-D40, 2008-D41, 2008-D42, 2008-D43 & 2008-D45 -- 2008 DX, 2008 DV, 2008 DJ, 2008 CP116, 2008 BC22, 2007 UM126, 2007 SV2, 2002 SS41, 86067, 66959, 2202
J93Mt. Tuffley Obs. in England, 3 in MPEC 2008-D42 -- 170891, 153591, 4954
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2008-D40 -- 2007 UM126
461SZTE Asteroid Program (SZTE) in Hungary, 8 in MPECs 2008-D41, 2008-D42, 2008-D43 & 2008-D44 -- 2008 DW, 2008 DV, 2008 DE, 2008 CE119, 2008 BC22, 2006 BG55, 2002 JC, 2000 ER70
E12Siding Spring Survey in New South Wales, 1 in MPEC 2008-D42 -- 2008 CN70
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2008-D42 -- 2001 SG10
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2008-D40, 2008-D42 & 2008-D44 -- 2008 DW, 2007 UM126, 2006 BA148, 137802, 5646, 2101
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2008-D42 & 2008-D44 -- 2008 DW, 2008 DB, 2008 CQ1, 2008 CM20, 2008 CM116, 2008 CM, 2008 CL116, 2008 CJ116, 2008 CD71, 2008 CB175, 2008 BT2, 2005 SR1, 2005 HC3, 164222
6735Jim Young via Table Mtn. Obs. in southern California, 5 in MPECs 2008-D42, 2008-D43, 2008-D45, 2008-D46 & 2008-D47 -- 2008 DY, 2008 DX, 2008 DV, 2008 DJ, 2008 DA4
A92Urseanu Obs. in Romania, 2 in MPEC 2008-D42 -- 11398, 1620

Impact Risk Monitoring  on 27 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 DA4JPL Sentry22052011-21083391.1e-06-5.43-6.500JPL: "Analysis based on 16 observations spanning .15991 days (2008-Feb-27.28072 to 2008-Feb-27.44063)." Diameter approximately 0.050 km. from mean, weighted H=24.1.
2008 DYJPL Sentry16272041-210248.4e-10-6.88-7.280JPL: "Analysis based on 13 observations spanning .97935 days (2008-Feb-26.33385 to 2008-Feb-27.3132)." Diameter approximately 0.272 km. from mean, weighted H=20.5.
2008 DJNEODyS1627206915.78e-10-6.95-6.950NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2008/02/25.338 to 2008/02/27.182."
JPL Sentry1627R E M O V E DJPL: Risk listing removed at 1025 UTC.
2008 DBJPL Sentry16272046-2108284.4e-05-4.75-4.830JPL: "Analysis based on 49 observations spanning 9.0117 days (2008-Feb-18.242 to 2008-Feb-27.25368)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
NEODyS16272046-2089282.58e-05-4.98-5.050NEODyS: "Based on 50 optical observations (of which 2 are rejected as outliers) from 2008/02/18.243 to 2008/02/27.254."
2008 CL116JPL Sentry1627210213.9e-07-4.17-4.170JPL: "Analysis based on 65 observations spanning 16.019 days (2008-Feb-10.40671 to 2008-Feb-26.42554)." Diameter approximately 0.300 km. from mean, weighted H=20.3.
2008 AF4JPL Sentry17042078-2099162.0e-05-2.37-2.491JPL: "Analysis based on 551 observations spanning 47.539 days (2008-Jan-10.39652 to 2008-Feb-26.93579)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
NEODyS16272078-2090101.6e-05-2.46-2.491NEODyS: "Based on 555 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/26.937. NOTE: The Virtual Impactor in 2089/01/09.485 in the table above is rated as Torino Scale 1."

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 27 February '08

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

2307Grabbed MPEC 2008-D48 - 2007 TK422, 2007 VJ305 - see above
2205Noted that JPL Sentry has posted 2008 DA4 as an impact risk - see above
1814Grabbed MPEC 2008-D47 - 2008 DA4 - see above
1704Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
1628Grabbed MPEC 2008-D42 - Daily Orbit Update - see above
1627Noted that NEODyS 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 updated its 2008 DB risk assessment - see above
Noted that NEODyS has updated its 2008 DB risk assessment - see above
Noted that JPL Sentry has removed 2008 DJ as an impact risk - see above
Noted that NEODyS has updated its 2008 DJ risk assessment - see above
Noted that JPL Sentry has posted 2008 DY as an impact risk - see above
1626Grabbed MPEC 2008-D43 - 2008 DV - see above
Grabbed MPEC 2008-D44 - 2008 DW - see above
Grabbed MPEC 2008-D45 - 2008 DX - see above
Grabbed MPEC 2008-D46 - 2008 DY - see above
0401Grabbed MPEC 2008-D41 - 2008 BC22 - see above
0032Grabbed MPEC 2008-D40 - 2007 UM126 - see above