Contents  on 2 April '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 2 April '09

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There was one listing noted earlier today.

New MPECs  on 2 April '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 2 Apr. '09 >>  MPEC 2009-G06 - "06:11 UT" - Daily Orbit Update

Observers  on 2 April '09

Nineteen observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 11 in MPEC 2009-G06 -- 2009 FY29, 2009 FU30, 2009 FP29, 2009 FN32, 2009 FJ30, 2009 FJ, 2009 FG19, 2009 FF44, 2009 FE, 2009 ED1, 2008 SV11
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-G06 -- 2008 YK2
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2009-G06 -- 2006 SV19, 1999 FJ21, 39557, 208565, 177614, 138883, 8566, 4179, 3199
639Dresden Obs. in Germany, 2 in MPEC 2009-G06 -- 2009 FA, 2008 SV11
683Goodricke-Pigott Obs. in Arizona, 2 in MPEC 2009-G06 -- 141432, 138883
704LINEAR in New Mexico, 2 in MPEC 2009-G06 -- 2009 FG44, 152931
J14La Corte Obs., 1 in MPEC 2009-G06 -- 1036
474Mt. John Obs. in New Zealand, 5 in MPEC 2009-G06 -- 2009 FT32, 2009 FR30, 2009 FJ44, 2005 RD1, 2002 PO75
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPEC 2009-G06 -- 2009 FW4, 2009 FV4, 2009 FS4, 2009 EF3, 85953, 155336, 2061
J93Mt. Tuffley Obs. in England, 1 in MPEC 2009-G06 -- 2008 SV11
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2009-G06 -- 2009 FO28, 2009 FL25, 2009 FA, 2009 EQ2, 2009 DV42, 2009 DF1, 2009 DE47, 2008 WL60, 2007 BT2
D29Purple Mtn. Obs. XuYi Station (XuYi Sta.) in China, 4 in MPEC 2009-G06 -- 2009 EQ2, 89958, 141432, 5693
J41Raheny Obs. in Ireland, 6 in MPEC 2009-G06 -- 2009 FA, 2008 SV11, 2005 EM30, 68350, 8566, 3122
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2009-G06 -- 2005 EF, 5604
510Siegen Obs. in Germany, 2 in MPEC 2009-G06 -- 2009 FA, 2008 SV11
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2009-G06 -- 2009 FR, 2009 FO28, 2009 FE, 2009 EE1, 2008 US4, 2007 HF44, 2007 BF72, 89958, 159467
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2009-G06 -- 2009 FV4, 2009 FP29, 2009 FN28, 2009 FJ30, 2009 FJ, 2009 FG19, 2009 FE, 2009 EF3, 2009 CU1
H53Thompsonville Obs. in Illinois, 4 in MPEC 2009-G06 -- 2009 FA, 2009 DL1, 2009 CR2, 2007 BT2
0122Thierry Pauwels via Uccle Obs. in Belgium, 1 in MPEC 2009-G06 -- 2009 FL25
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 April '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 FJ30JPL Sentry1348R E M O V E DJPL: Risk listing removed at 0851 UTC.
2009 FG19JPL Sentry1348203111.2e-09-4.71-4.710JPL: "Analysis based on 65 observations spanning 11.716 days (2009-Mar-21.44815 to 2009-Apr-02.16442)." Diameter approximately 0.820 km. from mean, weighted H=18.1.
NEODyS1348R E M O V E D-
2009 FJJPL Sentry13482058-2107114.3e-05-4.39-4.410JPL: "Analysis based on 113 observations spanning 14.971 days (2009-Mar-17.30916 to 2009-Apr-01.28037)." Diameter approximately 0.036 km. from mean, weighted H=24.9.
NEODyS13482058-208854.19e-05-4.39-4.410NEODyS: "Based on 120 optical observations (of which 7 are rejected as outliers) from 2009/03/17.245 to 2009/04/01.281."
2009 FEJPL Sentry1348R E M O V E DJPL: Risk listing removed at 0851 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 2 April '09

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

1750Noted that the NEOCP has become empty
1348Noted that JPL Sentry has removed 2009 FE as an impact risk - see above
Noted that JPL Sentry has updated its 2009 FG19 risk assessment - see above
Noted that NEODyS has removed 2009 FG19 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 FJ risk assessment - see above
Noted that NEODyS has updated its 2009 FJ risk assessment - see above
Noted that JPL Sentry has removed 2009 FJ30 as an impact risk - see above
Grabbed MPEC 2009-G06 - Daily Orbit Update - see above