Contents  on 7 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 7 December '08

The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of eleven 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 7 December '08

Minor Planet Electronic Circulars

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


MPEC 2008-X58 - "18:06 UT" - 2008 XX2


MPEC 2008-X57 - "18:03 UT" - 2008 XW2


MPEC 2008-X56 - "18:00 UT" - 2008 XV2


MPEC 2008-X55 - "17:52 UT" - 2008 XU2


<< DOU on 7 Dec. '08 >>  MPEC 2008-X54 - "07:11 UT" - Daily Orbit Update


MPEC 2008-X53 - "05:42 UT" - 2006 UX184, 2008 UZ184

Observers  on 7 December '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 26 in MPECs 2008-X54 & 2008-X55 -- 2008 XU2, 2008 XS, 2008 XP, 2008 XO, 2008 XK1, 2008 XJ, 2008 XA2, 2008 WZ94, 2008 WZ13, 2008 WM61, 2008 WL60, 2008 WL, 2008 WJ96, 2008 WD14, 2008 WB59, 2008 VK14, 2008 VF, 2008 UE7, 2008 SV7, 2008 SP7, 2008 SE, 2008 RT26, 2008 MZ, 2008 MB5, 2007 VL8, 1998 XM2
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-X54 -- 2003 UX34
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2008-X54 & 2008-X57 -- 2008 XW2, 2002 XP90, 199801, 198856, 163683
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-X54 -- 2008 XC1, 2008 WZ94, 2008 UK90, 2008 SX245
J95Great Shefford Obs. in England, 13 in MPECs 2008-X54, 2008-X55, 2008-X56, 2008-X57 & 2008-X58 -- 2008 XX2, 2008 XW2, 2008 XV2, 2008 XU2, 2008 XQ2, 2008 XP2, 2008 XO2, 2008 XM1, 2008 XB1, 2008 WZ13, 2008 WK96, 2008 WG14, 2008 UL90
379Hamamatsu-Yuto Obs. in Japan, 9 in MPEC 2008-X54 -- 2008 VU4, 2008 VK14, 2008 UE7, 2008 SQ1, 2008 MZ, 2006 VB14, 2006 SZ217, 2001 WA25, 2001 LM5
G92Jarnac Obs. in Arizona, 1 in MPEC 2008-X54 -- 20460
J66Kinver Obs. in England, 1 in MPEC 2008-X54 -- 2008 XM1
6959Joel Parker via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2008-X53 -- 2006 UZ184, 2006 UX184
704LINEAR in New Mexico, 15 in MPEC 2008-X54 -- 2008 XA2, 2008 WK, 2008 WH60, 2008 WE96, 2008 SV7, 2008 SQ1, 2008 RT26, 2008 MZ, 85236, 198856, 162004, 141052, 138859, 136923, 2212
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2008-X54, 2008-X55, 2008-X56, 2008-X57 & 2008-X58 -- 2008 XX2, 2008 XW2, 2008 XV2, 2008 XU2, 2008 XO2, 2008 XM1, 2008 XB2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-X54 -- 2008 TC2
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2008-X54, 2008-X55, 2008-X56, 2008-X57 & 2008-X58 -- 2008 XX2, 2008 XW2, 2008 XV2, 2008 XU2, 2008 XG, 2008 WY94, 2008 MR1, 2006 SU49, 2005 WS55, 1999 CW8
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2008-X54 -- 2008 XM1, 2008 XC1, 2008 XA2, 2008 WN2, 2008 WL60, 2008 VU4, 2008 VK14, 2008 SQ1, 2008 MZ, 2006 SZ217, 2005 TZ51, 2002 VY94, 2001 LM5
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2008-X55, 2008-X56 & 2008-X57 -- 2008 XW2, 2008 XV2, 2008 XU2
587Sormano Obs. in Italy, 5 in MPECs 2008-X54 & 2008-X57 -- 2008 XW2, 2008 XM1, 2008 XC1, 2008 XB1, 2008 XA2
291Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2008-X54 -- 2008 XN, 2008 XM1, 2008 XF, 2008 XC1, 2008 XB2, 2008 WZ13, 2008 WY32, 2008 WP1, 2008 WK32, 2008 WJ96, 2008 WH96, 2008 WG96, 2008 TD2, 2000 QK130
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 December '08

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.
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 XU2JPL Sentry19582039-209424.1e-08-7.50-7.500JPL: "Analysis based on 27 observations spanning 1.1543 days (2008-Dec-06.2616 to 2008-Dec-07.41587)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
2008 XQ2JPL Sentry15522012-2106761.6e-06-3.04-3.150JPL: "Analysis based on 23 observations spanning 1.7423 days (2008-Dec-05.41531 to 2008-Dec-07.15761)." Diameter approximately 0.338 km. from mean, weighted H=20.0.
NEODyS15522015-2088174.35e-07-3.19-3.220NEODyS: "Based on 23 optical observations (of which 1 are rejected as outliers) from 2008/12/05.416 to 2008/12/07.158."
2008 XP2JPL Sentry1552R E M O V E DJPL: Risk listing removed at 1039 UTC.
2008 XO2JPL Sentry15522053-209022.9e-09-5.28-5.310JPL: "Analysis based on 23 observations spanning 2.0053 days (2008-Dec-05.19431 to 2008-Dec-07.19959)." Diameter approximately 0.809 km. from mean, weighted H=18.1.
NEODyS15522027-206471.35e-08-4.58-5.200NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/12/05.195 to 2008/12/07.200."
2008 XM1JPL Sentry1552R E M O V E DJPL: Risk listing removed at 1033 UTC.
NEODyS1552R E M O V E D-
2008 XC1JPL Sentry15522085-208823.2e-06-4.98-5.230JPL: "Analysis based on 50 observations spanning 3.7845 days (2008-Dec-03.36799 to 2008-Dec-07.15247)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
NEODyS15522085-208823.07e-06-4.99-5.240NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2008/12/03.369 to 2008/12/07.153."
2008 WK96JPL Sentry15522024-203126.6e-05-2.69-2.690JPL: "Analysis based on 28 observations spanning 6.8215 days (2008-Nov-30.38762 to 2008-Dec-07.20912)." Diameter approximately 0.088 km. from mean, weighted H=22.9.
NEODyS15522024-203246.22e-05-2.71-2.710NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/07.210."
2008 WY94JPL Sentry15522054-207367.7e-06-5.70-5.820JPL: "Analysis based on 28 observations spanning 6.5684 days (2008-Nov-29.54021 to 2008-Dec-06.10859)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS15522068-2087131.04e-05-5.56-5.670NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2008/11/29.541 to 2008/12/06.109."
2008 WZ13NEODyS1801R E M O V E D-
JPL Sentry1552R E M O V E DJPL: Risk listing removed at 0951 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 7 December '08

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

1958Noted that JPL Sentry has posted 2008 XU2 as an impact risk - see above
1859Grabbed MPEC 2008-X56 - 2008 XV2 - see above
Grabbed MPEC 2008-X57 - 2008 XW2 - see above
Grabbed MPEC 2008-X58 - 2008 XX2 - see above
1801Noted that NEODyS has removed 2008 WZ13 as an impact risk - see above
Grabbed MPEC 2008-X55 - 2008 XU2 - see above
1552Noted 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 WY94 risk assessment - see above
Noted that NEODyS has updated its 2008 WY94 risk assessment - see above
Noted that JPL Sentry has removed 2008 WZ13 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 removed 2008 XM1 as an impact risk - see above
Noted that NEODyS has removed 2008 XM1 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 XO2 risk assessment - see above
Noted that NEODyS has posted 2008 XO2 as an impact risk - see above
Noted that JPL Sentry has removed 2008 XP2 as an impact risk - see above
Noted that JPL Sentry has posted 2008 XQ2 as an impact risk - see above
Noted that NEODyS has posted 2008 XQ2 as an impact risk - see above
Grabbed MPEC 2008-X54 - Daily Orbit Update - see above
0622Grabbed MPEC 2008-X53 - 2006 UX184, 2008 UZ184 - see above