Contents  on 5 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.

Radar Astrometry  on 5 December '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data addition noted at 2015 UTC when the database was dated 5 Dec.

NEOCP Activity  on 5 December '08

The MPC's NEO Confirmation Page has 8 listings: 8 updated

When last checked at 2309 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eight updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of eighteen objects listed on the NEOCP at some point today.

New MPECs  on 5 December '08

Minor Planet Electronic Circulars

As of last check at 2309 UTC, there have been eight MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-X46 - "19:59 UT" - 2008 XE2


MPEC 2008-X45 - "16:36 UT" - 2008 XC2


MPEC 2008-X44 - "16:28 UT" - 2008 XB2


MPEC 2008-X43 - "16:23 UT" - 2008 XA2


MPEC 2008-X42 - "15:56 UT" - Comet C/2008 X1 (Hill)


MPEC 2008-X41 - "12:38 UT" - 2003 MT


<< DOU on 5 Dec. '08 >>  MPEC 2008-X40 - "07:12 UT" - Daily Orbit Update


MPEC 2008-X39 - "05:15 UT" - 2007 UP6

Observers  on 5 December '08

A total of 22 observing facilities appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 4179
300Bisei Spaceguard Center in Japan, 1 in MPEC 2008-X40 -- 2008 XC1
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2008-X40, 2008-X42 & 2008-X46 -- 2008 XE2, C/2008 X1, 2008 WN, 2008 VU4, 2004 TU11, 2002 RQ25, 68031, 39572, 194126, 141079, 11405, 3360
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-X40 -- 2008 VG14, 2008 TQ2, 2006 WK3, 2005 XH8
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 4179
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4179
704LINEAR in New Mexico, 16 in MPECs 2008-X40, 2008-X43, 2008-X44 & 2008-X45 -- 2008 XM1, 2008 XC2, 2008 XB2, 2008 XA2, 2008 WN, 2008 SQ1, 2008 MR1, 2002 VY94, 2001 FX9, 89355, 54071, 52768, 16834, 162900, 141052, 137799
D35Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-X40 -- 2008 UE7
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2008-X40 & 2008-X46 -- 2008 XE2, 2008 XC1
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2008-X39 & 2008-X41 -- 2007 UP6, 2003 MT
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2008-X40, 2008-X42, 2008-X43 & 2008-X45 -- 2008 XC2, 2008 XA2, C/2008 X1, 2008 WX32, 2008 WL61, 2008 WD, 2008 VQ4, 2008 VG14, 2008 TA1, 2004 XK3, 2000 AE6, 85867, 22753, 196068, 18882, 153814, 144901, 138859, 4179
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2008-X40 -- 2008 WL60, 2008 WK, 2008 WB59, 2008 VU4, 2008 UE7, 2008 MZ, 2006 SZ217
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-X42 -- C/2008 X1
854Sabino Canyon Obs. in Arizona, 4 in MPECs 2008-X42, 2008-X43, 2008-X45 & 2008-X46 -- 2008 XE2, 2008 XC2, 2008 XA2, C/2008 X1
434San Benedetto Po Obs. in Italy, 2 in MPEC 2008-X40 -- 2008 SQ1, 2005 TZ51
H36Sandlot Obs. in Kansas, 1 in MPEC 2008-X46 -- 2008 XE2
E12Siding Spring Survey in New South Wales, 1 in MPEC 2008-X40 -- 2008 WD14
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2008-X40 -- 2008 WZ94, 2008 SR, 199801, 194386, 186844, 177651, 163373, 153220
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2008-X40 & 2008-X44 -- 2008 XO, 2008 XN, 2008 XB2, 2008 WZ13, 2008 WQ63, 2008 WK96, 2008 WJ60, 2008 WF14, 2008 VQ4, 2008 VB1, 2008 TQ10, 2008 SJ82
B18Terskol Obs. in Russia, 2 in MPECs 2008-X43 & 2008-X46 -- 2008 XE2, 2008 XA2
A48Verona Obs. in Italy, 3 in MPEC 2008-X40 -- 2008 WL60, 2008 WG14, 2008 SQ1
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2008-X40 -- 1865
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 December '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2309 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 XB2JPL Sentry22172013-2108731.7e-07-6.64-7.140JPL: "Analysis based on 7 observations spanning 1.2542 days (2008-Dec-04.1924 to 2008-Dec-05.44663)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
2008 XM1JPL Sentry13572011-21072645.6e-07-3.98-4.700JPL: "Analysis based on 17 observations spanning .21138 days (2008-Dec-04.20208 to 2008-Dec-04.41346)." Diameter approximately 0.156 km. from mean, weighted H=21.7.
NEODyS13572013-2081148.98e-09-5.53-6.020NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/12/04.203 to 2008/12/04.414."
2008 XC1JPL Sentry13572058-2106231.1e-05-4.38-4.940JPL: "Analysis based on 26 observations spanning .99583 days (2008-Dec-03.36799 to 2008-Dec-04.36382)." Diameter approximately 0.070 km. from mean, weighted H=23.4.
NEODyS13572058-2088114.6e-06-4.69-5.110NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2008/12/03.369 to 2008/12/04.365."
2008 XONEODyS1357R E M O V E D-
JPL Sentry1357R E M O V E DJPL: Risk listing removed at 1130 UTC.
2008 XNNEODyS13582048-206325.43e-10-7.09-7.230NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008/12/02.361 to 2008/12/04.423."
JPL Sentry13572063-209728.1e-10-7.17-7.330JPL: "Analysis based on 15 observations spanning 2.0618 days (2008-Dec-02.36013 to 2008-Dec-04.42193)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
2008 WK96NEODyS13582024-203242.75e-05-3.02-3.020NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/04.544."
JPL Sentry13572024-203122.7e-05-3.02-3.030JPL: "Analysis based on 19 observations spanning 4.1552 days (2008-Nov-30.38762 to 2008-Dec-04.54287)." Diameter approximately 0.093 km. from mean, weighted H=22.8.
2008 WZ13JPL Sentry13572051-210462.2e-09-5.82-6.290JPL: "Analysis based on 53 observations spanning 14.080 days (2008-Nov-20.27557 to 2008-Dec-04.35533)." Diameter approximately 0.601 km. from mean, weighted H=18.8.
NEODyS1357206811.76e-11-7.81-7.810NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2008/11/20.276 to 2008/12/04.356."

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 5 December '08

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

2217Noted that JPL Sentry has posted 2008 XB2 as an impact risk - see above
2015Grabbed MPEC 2008-X46 - 2008 XE2 - see above
Noted Radar Astrometry database addition - see above
1719Grabbed MPEC 2008-X44 - 2008 XB2 - see above
Grabbed MPEC 2008-X45 - 2008 XC2 - see above
1628Grabbed MPEC 2008-X42 - Comet C/2008 X1 (Hill) - see above
Grabbed MPEC 2008-X43 - 2008 XA2 - see above
1358Noted that NEODyS has updated its 2008 WK96 risk assessment - see above
Noted that NEODyS has updated its 2008 XN risk assessment - see above
Grabbed MPEC 2008-X40 - Daily Orbit Update - see above
1357Noted that JPL Sentry 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 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 posted 2008 XM1 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 XN risk assessment - see above
Noted that JPL Sentry has removed 2008 XO as an impact risk - see above
Noted that NEODyS has removed 2008 XO as an impact risk - see above
Grabbed MPEC 2008-X41 - 2003 MT - see above
0534Grabbed MPEC 2008-X39 - 2007 UP6 - see above