Contents  on 27 December '08

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 December '08

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2359 UTC). It was last noted active yesterday.

New MPECs  on 27 December '08

Minor Planet Electronic Circulars

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


MPEC 2008-Y57 - "23:46 UT" - Comet P/2008 X1 (Hill)


<< DOU on 27 Dec. '08 >>  MPEC 2008-Y56 - "07:06 UT" - Daily Orbit Update


MPEC 2008-Y55 - "05:28 UT" - Comet C/2008 X3 (LINEAR)

Observers  on 27 December '08

A total of 26 observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2008-Y55 -- C/2008 X3
H55Astronomical Research Obs. (ARO) in Illinois, 23 in MPEC 2008-Y56 -- 2008 YQ2, 2008 YK2, 2008 YJ3, 2008 YF, 2008 YE3, 2008 XP2, 2008 XE3, 2008 UE7, 2008 RT26, 2008 EV5, 2007 UY1, 2007 MK13, 2006 WZ2, 2006 WY2, 2006 WE4, 2006 SX217, 2005 NJ1, 2005 BC, 2003 XB22, 2002 XP90, 2002 NW16, 2001 FX9, 2000 FL1
A74Bergen-Enkheim Obs. in Germany, 2 in MPEC 2008-Y56 -- 2007 VL8, 2000 ED14
321Craigie Obs., 1 in MPEC 2008-Y57 -- P/2008 X1
448Desert Moon Obs. in New Mexico, 1 in MPEC 2008-Y56 -- 2008 XN
151Eschenberg Obs. in Switzerland, 5 in MPEC 2008-Y56 -- 2008 WN2, 2008 SH82, 2008 MZ, 2004 LV3, 2002 VY94
E85Farm Cove Obs. in New Zealand, 1 in MPEC 2008-Y57 -- P/2008 X1
B23Fiamene Obs. in Italy, 6 in MPEC 2008-Y56 -- 2008 SQ1, 2008 MZ, 2005 TZ51, 2002 VY94, 89355, 162361
J95Great Shefford Obs. in England, 4 in MPEC 2008-Y56 -- 2008 YQ2, 2008 YN2, 2008 YM2, 2008 YC3
A17Guidestar Obs. in Germany, 2 in MPEC 2008-Y56 -- 2008 WB59, 2008 VU4
355Hadano Obs. in Japan, 2 in MPECs 2008-Y55 & 2008-Y57 -- C/2008 X3, P/2008 X1
379Hamamatsu-Yuto Obs. in Japan, 7 in MPEC 2008-Y56 -- 2008 YK2, 2008 WQ63, 2008 WL60, 2008 SQ1, 2008 SH82, 2004 LV3, 2000 FL1
400Kitami Obs. in Japan, 1 in MPEC 2008-Y57 -- P/2008 X1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-Y56 -- 2005 SB71
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2008-Y56 -- 2008 SQ1, 200840, 2368
213Montcabre Obs. in Spain, 1 in MPEC 2008-Y57 -- P/2008 X1
474Mt. John Obs. in New Zealand, 2 in MPEC 2008-Y56 -- 2008 YJ3, 2004 QV16
A13Naef Obs. in Switzerland, 4 in MPEC 2008-Y56 -- 2008 XE3, 2008 EV5, 2007 UY1, 2001 WT1
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2008-Y56 -- 2008 YK2, 2008 SQ1, 2008 SH82
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2008-Y55 -- C/2008 X3
473Remanzacco Obs. in Italy, 1 in MPEC 2008-Y57 -- P/2008 X1
204Schiaparelli Obs. in Italy, 9 in MPECs 2008-Y55, 2008-Y56 & 2008-Y57 -- 2008 YJ3, 2008 YG3, 2008 YF3, 2008 YE3, 2008 YC3, C/2008 X3, P/2008 X1, 2008 SH82, 2001 VK5
A78Stia Obs. in Italy, 1 in MPEC 2008-Y56 -- 2008 XV2
673Table Mtn. Obs. in southern California, 1 in MPEC 2008-Y57 -- P/2008 X1
J70Vega del Thader Obs. in Spain, 1 in MPEC 2008-Y57 -- P/2008 X1
A48Verona Obs. in Italy, 4 in MPEC 2008-Y56 -- 2008 YK2, 2008 VK14, 2008 SQ1, 2008 SH82
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 December '08

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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
2008 YJ3NEODyS1536R E M O V E D-
JPL Sentry1536R E M O V E DJPL: Risk listing removed at 0951 UTC.
2008 YC3JPL Sentry15362090-210037.2e-09-8.78-8.900JPL: "Analysis based on 18 observations spanning 4.5467 days (2008-Dec-22.25277 to 2008-Dec-26.79945)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS1536R E M O V E D-
2008 YN2JPL Sentry1536R E M O V E DJPL: Risk listing removed at 0955 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 December '08

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

2359Grabbed MPEC 2008-Y57 - Comet P/2008 X1 (Hill) - see above
1536Noted that JPL Sentry has updated its 2008 YC3 risk assessment - see above
Noted that NEODyS has removed 2008 YC3 as an impact risk - see above
Noted that JPL Sentry has removed 2008 YJ3 as an impact risk - see above
Noted that NEODyS has removed 2008 YJ3 as an impact risk - see above
Noted that JPL Sentry has removed 2008 YN2 as an impact risk - see above
Grabbed MPEC 2008-Y56 - Daily Orbit Update - see above
0535Grabbed MPEC 2008-Y55 - Comet C/2008 X3 (LINEAR) - see above