Contents  on 6 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 6 December '08

The MPC's NEO Confirmation Page has 8 listings: 3 new, 5 updated

When last checked at 2248 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and five updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of seventeen 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 6 December '08

Minor Planet Electronic Circulars

As of last check at 2248 UTC, there have been six MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-X52 - "15:21 UT" - 2008 XQ2


MPEC 2008-X51 - "15:16 UT" - 2008 XP2


MPEC 2008-X50 - "15:13 UT" - 2008 XO2


<< DOU on 6 Dec. '08 >>  MPEC 2008-X49 - "07:11 UT" - Daily Orbit Update


MPEC 2008-X48 - "04:31 UT" - Comet C/2008 X3 (LINEAR)


MPEC 2008-X47 - "00:08 UT" - 2006 QJ181

Observers  on 6 December '08

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 13 in MPEC 2008-X49 -- 2008 XN, 2008 XM1, 2008 XM, 2008 XL1, 2008 XE2, 2008 XC1, 2008 XB2, 2008 WP1, 2008 WK96, 2008 WH60, 2008 WE96, 2008 WA14, 2008 TK157
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2008-X49, 2008-X51 & 2008-X52 -- 2008 XQ2, 2008 XP2, 2008 WK, 2004 TU11, 2002 XP90, 2001 WA25, 17511, 154715
695Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2008-X47 -- 2006 QJ181
704LINEAR in New Mexico, 1 in MPEC 2008-X48 -- C/2008 X3
688Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2008-X47 -- 2006 QJ181
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2008-X50, 2008-X51 & 2008-X52 -- 2008 XQ2, 2008 XP2, 2008 XO2
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-X48, 2008-X49, 2008-X50, 2008-X51 & 2008-X52 -- 2008 XQ2, 2008 XP2, 2008 XO2, C/2008 X3, 2001 YX11, 90075, 152889, 141765, 138859
H36Sandlot Obs. in Kansas, 1 in MPEC 2008-X48 -- C/2008 X3
204Schiaparelli Obs. in Italy, 3 in MPEC 2008-X49 -- 2008 WL60, 2008 WK61, 138852
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2008-X49 -- 2008 WJ96, 2007 EM88
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2008-X49 & 2008-X50 -- 2008 XO2, 2008 XC1, 2008 WZ13, 2008 WY32, 2008 WX32, 2008 WS62, 2008 WK96, 2008 WK32, 2008 UU1
B18Terskol Obs. in Russia, 1 in MPEC 2008-X48 -- C/2008 X3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 December '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2248 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 XP2JPL Sentry1708210611.7e-09-5.88-5.880JPL: "Analysis based on 20 observations spanning .99279 days (2008-Dec-05.41591 to 2008-Dec-06.4087)." Diameter approximately 0.630 km. from mean, weighted H=18.7.
2008 XO2JPL Sentry17082016-2100681.9e-08-4.28-4.990JPL: "Analysis based on 18 observations spanning 1.1789 days (2008-Dec-05.19431 to 2008-Dec-06.37319)." Diameter approximately 0.768 km. from mean, weighted H=18.2.
2008 XB2JPL Sentry1557R E M O V E DJPL: Risk listing removed at 0956 UTC.
2008 XM1JPL Sentry15572015-2061107.0e-07-3.91-4.120JPL: "Analysis based on 20 observations spanning .92122 days (2008-Dec-04.20208 to 2008-Dec-05.1233)." Diameter approximately 0.149 km. from mean, weighted H=21.8.
NEODyS15572041-206147.29e-08-5.14-5.200NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/12/04.203 to 2008/12/05.124."
2008 XC1JPL Sentry15572058-209482.9e-06-5.00-5.380JPL: "Analysis based on 32 observations spanning 1.9009 days (2008-Dec-03.36799 to 2008-Dec-05.26887)." Diameter approximately 0.068 km. from mean, weighted H=23.5.
NEODyS15572058-208852.59e-06-5.04-5.400NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2008/12/03.369 to 2008/12/05.270."
2008 XNJPL Sentry1557R E M O V E DJPL: Risk listing removed at 1030 UTC.
NEODyS1557R E M O V E D-
2008 WK96JPL Sentry15572024-203125.1e-05-2.80-2.800JPL: "Analysis based on 25 observations spanning 5.1474 days (2008-Nov-30.38762 to 2008-Dec-05.53502)." Diameter approximately 0.088 km. from mean, weighted H=22.9.
NEODyS15572024-203134.89e-05-2.82-2.820NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/05.536."
2008 WZ13JPL Sentry15572068-209331.8e-09-5.95-6.230JPL: "Analysis based on 56 observations spanning 15.087 days (2008-Nov-20.27557 to 2008-Dec-05.36209)." Diameter approximately 0.592 km. from mean, weighted H=18.8.
NEODyS1557206812.59e-11-7.65-7.650NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2008/11/20.276 to 2008/12/05.363."

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 6 December '08

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

1708Noted that JPL Sentry has posted 2008 XO2 as an impact risk - see above
Noted that JPL Sentry has posted 2008 XP2 as an impact risk - see above
1557Noted that JPL Sentry has updated its 2008 WK96 risk assessment - see above
Noted that NEODyS has updated its 2008 WK96 risk assessment - see above
Noted that JPL Sentry has updated its 2008 WZ13 risk assessment - see above
Noted that NEODyS has updated its 2008 WZ13 risk assessment - see above
Noted that JPL Sentry has removed 2008 XB2 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 XC1 risk assessment - see above
Noted that NEODyS has updated its 2008 XC1 risk assessment - see above
Noted that JPL Sentry has updated its 2008 XM1 risk assessment - see above
Noted that NEODyS has updated its 2008 XM1 risk assessment - see above
Noted that JPL Sentry has removed 2008 XN as an impact risk - see above
Noted that NEODyS has removed 2008 XN as an impact risk - see above
Grabbed MPEC 2008-X49 - Daily Orbit Update - see above
Grabbed MPEC 2008-X50 - 2008 XO2 - see above
Grabbed MPEC 2008-X51 - 2008 XP2 - see above
Grabbed MPEC 2008-X52 - 2008 XQ2 - see above
0520Grabbed MPEC 2008-X48 - Comet C/2008 X3 (LINEAR) - see above
0021Grabbed MPEC 2008-X47 - 2006 QJ181 - see above