Contents  on 21 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 21 February '09

The MPC's NEO Confirmation Page has 4 listings: 4 updated

When last checked at 2303 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of twelve 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 21 February '09

Minor Planet Electronic Circulars

As of last check at 2303 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-D47 - "22:00 UT" - 2009 DG9


MPEC 2009-D46 - "14:36 UT" - 2009 DQ4


MPEC 2009-D45 - "14:32 UT" - 2009 DP4


MPEC 2009-D44 - "14:28 UT" - 2009 DO4


MPEC 2009-D43 - "14:25 UT" - 2009 DN4


<< DOU on 21 Feb. '09 >>  MPEC 2009-D42 - "07:07 UT" - Daily Orbit Update


MPEC 2009-D41 - "04:00 UT" - 2006 CX10

Observers  on 21 February '09

A total of 23 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 6 in MPEC 2009-D42 -- 2009 CA2, 2009 AT, 2009 AL15, 2008 UC, 2005 GC120, 2001 GQ2
I77CEAMIG-REA in Brazil, 2 in MPECs 2009-D44 & 2009-D46 -- 2009 DQ4, 2009 DO4
493Calar Alto Obs. in Spain, 2 in MPECs 2009-D44 & 2009-D45 -- 2009 DP4, 2009 DO4
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2009-D42, 2009-D45 & 2009-D47 -- 2009 DP4, 2009 DG9, 2004 EU9, 99935, 85990, 35396, 205744, 203217, 194386, 138883, 11405, 5693
448Desert Moon Obs. in New Mexico, 4 in MPEC 2009-D42 -- 2009 CS1, 2009 BJ58, 2009 BB, 2002 FB6
734Farpoint Obs. in Kansas, 1 in MPEC 2009-D42 -- 2009 CS5
F658David Tholen's team via Faulkes Telescope North in Hawaii, 1 in MPEC 2009-D41 -- 2006 CX10
F659program code 9 via Faulkes Telescope North in Hawaii, 2 in MPEC 2009-D42 -- 2008 EE5, 16834
203GiaGa Obs. in Italy, 2 in MPEC 2009-D42 -- 162900, 137925
H05Kline Obs. in Colorado, 1 in MPEC 2009-D42 -- 2009 DC1
704LINEAR in New Mexico, 11 in MPECs 2009-D42 & 2009-D44 -- 2009 DR3, 2009 DO4, 2009 DM1, 2009 DD, 2009 CO5, 2008 TE157, 2000 AE6, 99935, 38086, 142348, 6050
B33Libbiano Obs. in Italy, 1 in MPEC 2009-D47 -- 2009 DG9
130Lumezzane Obs. in Italy, 9 in MPEC 2009-D42 -- 2009 CP5, 2009 CO5, 2008 EE, 2007 BT2, 206359, 143651, 101873, 4179, 1863
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2009-D42, 2009-D43, 2009-D44, 2009-D45, 2009-D46 & 2009-D47 -- 2009 DQ4, 2009 DP4, 2009 DO4, 2009 DN4, 2009 DG9, 2009 DF1, 2009 DE1, 2009 BF58
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-D41 -- 2006 CX10
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2009-D42 & 2009-D43 -- 2009 DV, 2009 DN4, 2009 CQ5, 2000 JO78, 18109, 162361
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2009-D42 -- 2009 CO5, 2009 BP58, 2009 BD77, 2009 BA71, 2008 RM98, 2008 QT3, 2008 EE, 2006 WZ2, 2006 BC10, 2004 EU9
H06\B. Conklin via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-D42 -- 2008 EA32
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2009-D42 -- 2009 BD77
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2009-D44, 2009-D45 & 2009-D46 -- 2009 DQ4, 2009 DP4, 2009 DO4
B04Saint-Barthelemy Obs. in Italy, 2 in MPECs 2009-D45 & 2009-D46 -- 2009 DQ4, 2009 DP4
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2009-D42 & 2009-D46 -- 2009 DQ4, 153243, 108519
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2009-D42 -- 85867, 206378, 141495, 3102
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2009-D42 -- 2009 CR1, 2009 CQ5, 2009 BJ58, 2009 AT, 2008 YZ28, 2008 YA, 2006 SD6, 2005 GC120, 2002 EY2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 February '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2303 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 DR3NEODyS16002019-204863.87e-07-4.35-4.500NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2009/02/20.289 to 2009/02/20.834."
JPL Sentry15592015-2107741.2e-06-4.07-4.360JPL: "Analysis based on 27 observations spanning .54488 days (2009-Feb-20.28832 to 2009-Feb-20.8332)." Diameter approximately 0.190 km. from mean, weighted H=21.3.
2009 DM1NEODyS16002010-2090392.34e-08-3.09-3.230NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/02/19.116 to 2009/02/20.153."
JPL Sentry15592010-21081291.0e-07-2.74-2.960JPL: "Analysis based on 25 observations spanning 1.0373 days (2009-Feb-19.11474 to 2009-Feb-20.15204)." Diameter approximately 1.200 km. from mean, weighted H=17.3.
2009 DF1JPL Sentry1559R E M O V E DJPL: Risk listing removed at 0949 UTC.
NEODyS1559R E M O V E D-
2009 DE1JPL Sentry1559209513.6e-08-7.14-7.140JPL: "Analysis based on 23 observations spanning 1.1139 days (2009-Feb-19.38939 to 2009-Feb-20.50327)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
NEODyS1559R E M O V E D-
2009 BF58NEODyS16002057-2090392.08e-04-5.08-5.310NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2009/01/28.263 to 2009/02/20.285."
JPL Sentry15592057-2087252.1e-04-5.07-5.300JPL: "Analysis based on 52 observations spanning 23.021 days (2009-Jan-28.26267 to 2009-Feb-20.28409)." Diameter approximately 0.012 km. from mean, weighted H=27.3.

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 21 February '09

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

2303Grabbed MPEC 2009-D47 - 2009 DG9 - see above
1600Noted that NEODyS has updated its 2009 BF58 risk assessment - see above
Grabbed MPEC 2009-D42 - Daily Orbit Update - see above
Grabbed MPEC 2009-D46 - 2009 DQ4 - see above
1559Noted that JPL Sentry has updated its 2009 BF58 risk assessment - see above
Noted that JPL Sentry has updated its 2009 DE1 risk assessment - see above
Noted that NEODyS has removed 2009 DE1 as an impact risk - see above
Noted that JPL Sentry has removed 2009 DF1 as an impact risk - see above
Noted that NEODyS has removed 2009 DF1 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 DM1 risk assessment - see above
Noted that NEODyS has posted 2009 DM1 as an impact risk - see above
Noted that JPL Sentry has posted 2009 DR3 as an impact risk - see above
Noted that NEODyS has posted 2009 DR3 as an impact risk - see above
Grabbed MPEC 2009-D43 - 2009 DN4 - see above
Grabbed MPEC 2009-D44 - 2009 DO4 - see above
Grabbed MPEC 2009-D45 - 2009 DP4 - see above
0503Grabbed MPEC 2009-D41 - 2006 CX10 - see above