Contents  on 1 December '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 December '09

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. Of these, two were "one nighters." The Tracking News counted a total of four listings on the NEOCP at some point on this day.

New MPECs  on 1 December '09

Minor Planet Electronic Circulars

There were two MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 1 Dec. '09 >>  MPEC 2009-X02 - "07:10 UT" - Daily Orbit Update


MPEC 2009-X01 - "04:46 UT" - Comet P/2009 S1 = 2001 Q10 (Gibbs)

Observers  on 1 December '09

Fourteen observing facilities appeared in this day's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-X02 -- 217807
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 20 in MPEC 2009-X02 -- 2009 WZ7, 2009 WZ104, 2009 WY51, 2009 WV25, 2009 WR6, 2009 WN25, 2009 WN106, 2009 WN, 2009 WL1, 2009 WG106, 2009 WG104, 2009 WF104, 2009 WF, 2009 WD106, 2009 WC26, 2009 WB105, 2009 WA105, 2009 UV18, 2009 ST103, 2009 QB35
J95Great Shefford Obs. in England, 1 in MPEC 2009-X02 -- 2009 WV25
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2009-X02 -- 2009 WV25, 2009 RN
682Kanab Obs. in Utah, 1 in MPEC 2009-X02 -- 2009 WV25
568[Ovidiu Vaduvescu on Mauna Kea in Hawaii, 67 in MPEC 2009-X02 -- 2008 OX2, 2008 DJ, 2008 CR118, 2008 AF4, 2006 SU49, 2006 PA1, 2006 AM4, 2005 WK4, 2005 WA1, 2005 VO5, 2005 RR6, 2005 JE46, 2005 HB4, 2005 CJ, 2004 UL, 2004 RF84, 2004 AE, 2003 YG118, 2002 AF3, 2001 UZ16, 90416, 88254, 87311, 86039, 68359, 65717, 53319, 52689, 31346, 27031, 24475, 222008, 217683, 212546, 209924, 20425, 198856, 19356, 18109, 172974, 171819, 164342, 164207, 164202, 163250, 163026, 162698, 162038, 159923, 159608, 154453, 153219, 152754, 143381, 142348, 141851, 141761, 138893, 138013, 137925, 136617, 102873, 100085, 7092, 6569, 4587, 2059
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-X02 -- 2009 UF72
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2009-X01 -- P/2001 Q10
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2009-X01 -- P/2001 Q10
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2009-X02 -- 2009 WV25, 433
H36Sandlot Obs. in Kansas, 2 in MPEC 2009-X02 -- 2009 WN, 2009 WF106
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2009-X02 -- 2009 WN25, 2009 WC26
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2009-X02 -- 2009 VY25
H53Thompsonville Obs. in Illinois, 2 in MPEC 2009-X02 -- 2002 NW16, 433
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 December '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 WF106JPL Sentry1544R E M O V E DJPL: Risk listing removed at 0952 UTC.
2008 AF4JPL Sentry15442099-210025.9e-07-3.93-3.940JPL: "Analysis based on 607 observations spanning 296.97 days (2007-Jul-28.34899 to 2008-May-20.315005)." Diameter approximately 0.400 km. from mean, weighted H=19.7.

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 December '09

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

1544Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has removed 2009 WF106 as an impact risk - see above
Grabbed MPEC 2009-X01 - Comet P/2009 S1 = 2001 Q10 (Gibbs) - see above
Grabbed MPEC 2009-X02 - Daily Orbit Update - see above