Contents  on 27 February '09

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 '09

The MPC's NEO Confirmation Page has 5 listings: 5 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five updated listings. All of these were "one nighters." So far The Tracking News has counted a total of 21 listings 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 '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-D75 - "21:30 UT" - 2009 DV43


MPEC 2009-D74 - "19:40 UT" - 2009 DT43


MPEC 2009-D73 - "19:35 UT" - 2009 DS43


MPEC 2009-D72 - "15:53 UT" - 2009 DC43


MPEC 2009-D71 - "15:50 UT" - 2009 DB43


MPEC 2009-D70 - "15:48 UT" - 2009 DA43


MPEC 2009-D69 - "15:45 UT" - 2009 DZ42


<< DOU on 27 Feb. '09 >>  MPEC 2009-D68 - "07:09 UT" - Daily Orbit Update


MPEC 2009-D67 - "00:52 UT" - 2009 DV42

Observers  on 27 February '09

A total of 22 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2009-D68 -- 2009 DZ, 2009 CZ2, 2009 CT5, 2009 CS1
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2009-D67, 2009-D68, 2009-D69, 2009-D72, 2009-D73, 2009-D74 & 2009-D75 -- 2009 DZ42, 2009 DV43, 2009 DV42, 2009 DT43, 2009 DS43, 2009 DC43, 2008 RM98
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2009-D68 -- 4596
448Desert Moon Obs. in New Mexico, 4 in MPEC 2009-D68 -- 2009 DF1, 2009 CW1, 2009 CQ5, 2007 EJ26
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 3 in MPECs 2009-D67, 2009-D68 & 2009-D72 -- 2009 DV42, 2009 DC43, 137925
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 2 in MPECs 2009-D67 & 2009-D72 -- 2009 DV42, 2009 DC43
651Grasslands Obs. in Arizona, 1 in MPEC 2009-D69 -- 2009 DZ42
F84Hibiscus Obs. in Tahiti, 1 in MPEC 2009-D69 -- 2009 DZ42
682Kanab Obs. in Utah, 1 in MPEC 2009-D68 -- 2009 DN1
704LINEAR in New Mexico, 7 in MPEC 2009-D68 -- 2009 CT5, 2009 BD77, 2008 YR2, 136617, 12711, 8567, 3199
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2009-D69, 2009-D70, 2009-D72 & 2009-D73 -- 2009 DZ42, 2009 DS43, 2009 DC43, 2009 DA43
474Mt. John Obs. in New Zealand, 1 in MPEC 2009-D69 -- 2009 DZ42
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2009-D68, 2009-D69, 2009-D70 & 2009-D71 -- 2009 DZ42, 2009 DB43, 2009 DA43, 19764
A24New Millennium Obs. in Italy, 15 in MPEC 2009-D68 -- 2008 SQ1, 2008 MZ, 2002 VY94, 2001 LM5, 162900, 153306, 142348, 141765, 136923, 8567, 7358, 3200, 1916, 1627, 1620
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2009-D72, 2009-D73 & 2009-D75 -- 2009 DV43, 2009 DS43, 2009 DC43
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2009-D75 -- 2009 DV43
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-D68 -- 2009 DQ4, 2009 DO4, 2009 DM1
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2009-D68 -- 2009 DH39, 2009 CT, 108519
587Sormano Obs. in Italy, 6 in MPECs 2009-D68, 2009-D71 & 2009-D72 -- 2009 DZ, 2009 DV42, 2009 DH39, 2009 DC43, 2009 DB43, 2009 BE81
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2009-D68 -- 2006 KT1, 7753
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2009-D68, 2009-D69, 2009-D70, 2009-D71 & 2009-D72 -- 2009 DZ42, 2009 DO1, 2009 DC43, 2009 DB43, 2009 DA43, 2009 CT1, 2009 CS5, 2009 CR5, 2009 CR4, 2004 MQ1, 2000 CK59
6735Jim Young via Table Mtn. Obs. in southern California, 3 in MPECs 2009-D67 & 2009-D68 -- 2009 DV42, 2009 DR36, 2009 DM40
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 February '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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
2009 DV43JPL Sentry22582019-2093174.7e-08-6.21-6.660JPL: "Analysis based on 23 observations spanning .58851 days (2009-Feb-27.29421 to 2009-Feb-27.88272)." Diameter approximately 0.062 km. from mean, weighted H=23.7.
2009 DT43JPL Sentry22042044-210143.9e-06-6.10-6.130JPL: "Analysis based on 17 observations spanning .11758 days (2009-Feb-27.41498 to 2009-Feb-27.53256)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
2009 DS43JPL Sentry22042019-2106593.2e-08-7.35-8.390JPL: "Analysis based on 18 observations spanning .13134 days (2009-Feb-27.33154 to 2009-Feb-27.46288)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2009 DC43JPL Sentry18582016-21081217.3e-08-3.35-4.080JPL: "Analysis based on 33 observations spanning .99968 days (2009-Feb-26.49973 to 2009-Feb-27.49941)." Diameter approximately 0.940 km. from mean, weighted H=17.8.
2009 DZ42JPL Sentry18182027-2108191.6e-07-4.31-4.740JPL: "Analysis based on 39 observations spanning 1.2661 days (2009-Feb-26.12849 to 2009-Feb-27.39462)." Diameter approximately 0.410 km. from mean, weighted H=19.6.
2009 DV42JPL Sentry15082015-2104795.4e-08-3.90-4.460JPL #2 for the day: "Analysis based on 22 observations spanning .60486 days (2009-Feb-26.42181 to 2009-Feb-27.02667)." Diameter approximately 0.642 km. from mean, weighted H=18.6.
NEODyS15082015-2089562.97e-08-4.05-4.480NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2009/02/26.423 to 2009/02/27.027."
2009 DH39JPL Sentry1508R E M O V E DJPL: Risk listing removed at 0951 UTC.

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 '09

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

2258Noted that JPL Sentry has posted 2009 DV43 as an impact risk - see above
2204Noted that JPL Sentry has posted 2009 DS43 as an impact risk - see above
Noted that JPL Sentry has posted 2009 DT43 as an impact risk - see above
Grabbed MPEC 2009-D75 - 2009 DV43 - see above
2003Grabbed MPEC 2009-D73 - 2009 DS43 - see above
Grabbed MPEC 2009-D74 - 2009 DT43 - see above
1858Noted that JPL Sentry has posted 2009 DC43 as an impact risk - see above
1818Noted that JPL Sentry has posted 2009 DZ42 as an impact risk - see above
1621Grabbed MPEC 2009-D71 - 2009 DB43 - see above
Grabbed MPEC 2009-D72 - 2009 DC43 - see above
1552Grabbed MPEC 2009-D70 - 2009 DA43 - see above
1549Grabbed MPEC 2009-D69 - 2009 DZ42 - see above
1508Noted that JPL Sentry has removed 2009 DH39 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 DV42 risk assessment - see above
Noted that NEODyS has posted 2009 DV42 as an impact risk - see above
Grabbed MPEC 2009-D68 - Daily Orbit Update - see above
0337Noted that JPL Sentry has posted 2009 DV42 as an impact risk - see above
0259Grabbed MPEC 2009-D67 - 2009 DV42 - see above