Contents  on 1 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 1 April '09

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of five 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 at Suno Observatory by Birtwhistle et al.

New MPECs  on 1 April '09

Minor Planet Electronic Circulars

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


MPEC 2009-G05 - "13:38 UT" - 2009 FJ44


MPEC 2009-G04 - "12:47 UT" - 2009 FH44


MPEC 2009-G03 - "12:44 UT" - 2009 FG44


MPEC 2009-G02 - "12:39 UT" - 2009 FF44


<< DOU on 1 Apr. '09 >>  MPEC 2009-G01 - "06:12 UT" - Daily Orbit Update

Observers  on 1 April '09

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

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 23 in MPECs 2009-G01, 2009-G04 & 2009-G05 -- 2009 FY29, 2009 FW4, 2009 FV23, 2009 FU30, 2009 FU23, 2009 FN28, 2009 FL25, 2009 FJ44, 2009 FJ30, 2009 FH44, 2009 FG19, 2009 FG, 2009 DL46, 2009 DL1, 2009 DD1, 2009 DC43, 2009 DC12, 2009 CT1, 2009 BT5, 2009 BD77, 2008 WL60, 2008 OB9, 2000 KN44
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-G01 & 2009-G05 -- 2009 FS4, 2009 FJ44, 2009 CO5, 175706, 162882
B60Deep Sky Obs. in Germany, 1 in MPEC 2009-G01 -- 2008 YE29
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-G01 -- 86666
J95Great Shefford Obs. in England, 3 in MPECs 2009-G01, 2009-G04 & 2009-G05 -- 2009 FJ44, 2009 FH44, 2008 SV11
704LINEAR in New Mexico, 9 in MPECs 2009-G01, 2009-G03 & 2009-G04 -- 2009 FH44, 2009 FG44, 2008 YR2, 2006 GQ2, 2005 SG19, 18172, 136617, 5604, 3988
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2009-G02, 2009-G04 & 2009-G05 -- 2009 FJ44, 2009 FH44, 2009 FF44
474Mt. John Obs. in New Zealand, 5 in MPECs 2009-G01, 2009-G04 & 2009-G05 -- 2009 FP28, 2009 FJ44, 2009 FJ30, 2009 FH44, 2009 CC3
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2009-G01, 2009-G02 & 2009-G03 -- 2009 FG44, 2009 FF44, 210012, 8034
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2009-G01 -- 143947
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2009-G04 & 2009-G05 -- 2009 FJ44, 2009 FH44
204Schiaparelli Obs. in Italy, 2 in MPEC 2009-G01 -- 2009 FX4, 2008 UV91
510Siegen Obs. in Germany, 2 in MPEC 2009-G01 -- 2009 FA, 1036
B40Skylive Obs. in Italy, 1 in MPEC 2009-G01 -- 2008 SV11
691Spacewatch 0.9m telescope in Arizona, 13 in MPEC 2009-G01 -- 2009 FF19, 2009 FE, 2007 HF44, 2007 BF72, 2003 UN12, 2002 HF8, 89958, 39557, 163679, 159467, 141432, 136874, 719
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2009-G01, 2009-G02 & 2009-G05 -- 2009 FS23, 2009 FJ44, 2009 FJ30, 2009 FJ, 2009 FG19, 2009 FG, 2009 FF44, 2009 FF, 2009 FE, 2009 DO1, 2009 DL46, 2009 CS, 2009 CB3
611Starkenburg Obs. in Germany, 3 in MPECs 2009-G01, 2009-G04 & 2009-G05 -- 2009 FO28, 2009 FJ44, 2009 FH44
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2009-G04 & 2009-G05 -- 2009 FJ44, 2009 FH44
G56Walnut Creek Obs. in northern California, 5 in MPEC 2009-G01 -- 2009 FA, 164400, 162900, 152931, 143651
198Wildberg Obs. in Germany, 3 in MPEC 2009-G01 -- 2009 FY4, 2009 FU30, 2009 FN28
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 Sentry1422210212.4e-09-7.62-7.620JPL: "Analysis based on 26 observations spanning 4.1889 days (2009-Mar-27.40474 to 2009-Mar-31.59363)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
NEODyS1422R E M O V E D-
2009 FG19JPL Sentry14222031-209251.1e-08-3.88-4.130JPL: "Analysis based on 56 observations spanning 9.7487 days (2009-Mar-21.44815 to 2009-Mar-31.19686)." Diameter approximately 0.828 km. from mean, weighted H=18.1.
NEODyS14222031-204421.1e-08-3.86-4.120NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2009/03/21.449 to 2009/03/31.198."
2009 FJJPL Sentry14222058-2107104.4e-05-4.38-4.410JPL: "Analysis based on 107 observations spanning 14.002 days (2009-Mar-17.30916 to 2009-Mar-31.31102)." Diameter approximately 0.036 km. from mean, weighted H=24.8.
NEODyS14222058-208444.15e-05-4.40-4.410NEODyS: "Based on 114 optical observations (of which 7 are rejected as outliers) from 2009/03/17.245 to 2009/03/31.312."
2009 FGJPL Sentry14222022-2107367.1e-06-5.58-6.130JPL: "Analysis based on 65 observations spanning 15.836 days (2009-Mar-16.3986 to 2009-Apr-01.2342)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS14222049-2087214.27e-06-5.79-6.140NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2009/03/16.399 to 2009/04/01.235."
2009 FEJPL Sentry1422204413.7e-07-4.59-4.590JPL: "Analysis based on 67 observations spanning 15.080 days (2009-Mar-16.27919 to 2009-Mar-31.359)." Diameter approximately 0.180 km. from mean, weighted H=21.3.
NEODyS1422R E M O V E D-
2004 FU162JPL Sentry03062010-21089565.8e-05-5.32-6.010JPL: "Analysis based on 4 observations spanning .03055 days (2004-Mar-31.27744 to 2004-Mar-31.30799)." Diameter approximately 0.006 km. from mean, weighted H=29.0.

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 1 April '09

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

1422Noted that JPL Sentry has updated its 2009 FE risk assessment - see above
Noted that NEODyS has removed 2009 FE as an impact risk - see above
Noted that JPL Sentry has updated its 2009 FG risk assessment - see above
Noted that NEODyS has updated its 2009 FG risk assessment - see above
Noted that JPL Sentry has updated its 2009 FG19 risk assessment - see above
Noted that NEODyS has updated its 2009 FG19 risk assessment - 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 updated its 2009 FJ30 risk assessment - see above
Noted that NEODyS has removed 2009 FJ30 as an impact risk - see above
Grabbed MPEC 2009-G01 - Daily Orbit Update - see above
Grabbed MPEC 2009-G02 - 2009 FF44 - see above
Grabbed MPEC 2009-G03 - 2009 FG44 - see above
Grabbed MPEC 2009-G04 - 2009 FH44 - see above
Grabbed MPEC 2009-G05 - 2009 FJ44 - see above
0306Noted that JPL Sentry has updated its 2004 FU162 risk assessment - see above