Contents  on 2 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 2 December '08

The MPC's NEO Confirmation Page has 5 listings: 3 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of eighteen 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 2 December '08

Minor Planet Electronic Circulars

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


MPEC 2008-X25 - "21:41 UT" - Comets C/2008 R11, 2008 R12, 2008 R13, 2008 S4 (SOHO)


MPEC 2008-X24 - "21:05 UT" - Comets C/2008 Q5, 2008 R8, 2008 R9, 2008 R10 (SOHO)


MPEC 2008-X23 - "13:17 UT" - 2008 XK


MPEC 2008-X22 - "13:12 UT" - 2008 XJ


MPEC 2008-X21 - "13:08 UT" - 2008 XH


MPEC 2008-X20 - "13:05 UT" - 2008 XG


MPEC 2008-X19 - "13:01 UT" - 2008 XF


MPEC 2008-X18 - "12:56 UT" - 1999 VF22


<< DOU on 2 Dec. '08 >>  MPEC 2008-X17 - "07:10 UT" - Daily Orbit Update

Observers  on 2 December '08

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2008-X17 -- 2008 SE, 2006 SZ217, 2004 XL14, 192559, 155110
448Desert Moon Obs. in New Mexico, 3 in MPEC 2008-X17 -- 2008 WQ63, 2008 VG14, 189973
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-X17 -- 2008 SE
J95Great Shefford Obs. in England, 3 in MPECs 2008-X17, 2008-X20 & 2008-X21 -- 2008 XH, 2008 XG, 2008 WK96
B19Iluro Obs. in Spain, 1 in MPEC 2008-X17 -- 194386
704LINEAR in New Mexico, 11 in MPEC 2008-X17 -- 2008 WZ94, 2008 WK61, 2008 VF, 2008 UE7, 2000 AE6, 85867, 199801, 19356, 7480, 7358, 4179
J75La Sagra Obs. in Spain, 1 in MPEC 2008-X17 -- 2008 WH60
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2008-X18, 2008-X19, 2008-X20, 2008-X21, 2008-X22 & 2008-X23 -- 2008 XK, 2008 XJ, 2008 XH, 2008 XG, 2008 XF, 1999 VF22
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-X17, 2008-X18, 2008-X19, 2008-X20, 2008-X21, 2008-X22 & 2008-X23 -- 2008 XK, 2008 XJ, 2008 XH, 2008 XG, 2008 XF, 2008 WE96, 2007 FE20, 2002 WP11, 1999 VF22
H36Sandlot Obs. in Kansas, 1 in MPEC 2008-X21 -- 2008 XH
E12Siding Spring Survey (SSS) in New South Wales, 7 in MPEC 2008-X17 -- 2008 WY94, 2008 WK60, 2008 WD14, 2008 UC, 2008 EV5, 2004 XY60, 22099
2492LASCO Coronagraph 2 (SOHO C2) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 3 in MPECs 2008-X24 & 2008-X25 -- C/2008 R8, C/2008 R12, C/2008 R10
2493LASCO Coronagraph 3 (SOHO C3) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 7 in MPECs 2008-X24 & 2008-X25 -- C/2008 S4, C/2008 R9, C/2008 R13, C/2008 R12, C/2008 R11, C/2008 R10, C/2008 Q5
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2008-X17, 2008-X19 & 2008-X20 -- 2008 XG, 2008 XF, 2008 WZ13, 2008 WY13, 2008 WM64, 2008 WL61, 2008 WB, 2008 VL14, 2008 UW99, 2008 UN90, 2008 TD4, 2006 UC63, 2006 BB27, 2005 AY28, 2001 TE2, 30825, 6050
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 XKJPL Sentry23122013-21071748.7e-07-6.81-7.710JPL: "Analysis based on 12 observations spanning .08663 days (2008-Dec-02.28019 to 2008-Dec-02.36682)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
2008 WK96JPL Sentry13322024-203124.4e-05-2.74-2.740JPL: "Analysis based on 16 observations spanning 1.8148 days (2008-Nov-30.38762 to 2008-Dec-02.20247)." Diameter approximately 0.099 km. from mean, weighted H=22.7.
NEODyS13322024-203134.03e-05-2.78-2.780NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/02.203."
2008 WJ96NEODyS1332203515.18e-10-9.20-9.200NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2008/11/30.311 to 2008/12/01.300."
2008 WH96NEODyS13322018-2090349.84e-09-6.70-7.250NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2008/11/30.276 to 2008/12/01.287."
2008 WY94JPL Sentry13322045-2076531.8e-04-4.26-4.510JPL: "Analysis based on 17 observations spanning 2.0238 days (2008-Nov-29.54021 to 2008-Dec-01.56401)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS13322046-2088711.96e-04-4.24-4.550NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/11/29.541 to 2008/12/01.565."
2008 WZ13JPL Sentry13322023-2106301.3e-06-2.77-3.050JPL: "Analysis based on 47 observations spanning 10.959 days (2008-Nov-20.27557 to 2008-Dec-01.2343)." Diameter approximately 0.600 km. from mean, weighted H=18.8.
NEODyS13322023-2090171.19e-06-2.78-3.070NEODyS: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2008/11/20.276 to 2008/12/01.235."
2008 WY13JPL Sentry1332R E M O V E DJPL: Risk listing removed at 0951 UTC.
2008 UW99JPL Sentry1332209325.5e-07-6.46-6.730JPL: "Analysis based on 50 observations spanning 30.911 days (2008-Oct-31.45784 to 2008-Dec-01.36885)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 2 December '08

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

2312Noted that JPL Sentry has posted 2008 XK as an impact risk - see above
Grabbed MPEC 2008-X24 - Comets C/2008 Q5, 2008 R8, 2008 R9, 2008 R10 (SOHO) - see above
Grabbed MPEC 2008-X25 - Comets C/2008 R11, 2008 R12, 2008 R13, 2008 S4 (SOHO) - see above
1332Noted that JPL Sentry has updated its 2008 UW99 risk assessment - see above
Noted that NEODyS has posted 2008 WH96 as an impact risk - see above
Noted that NEODyS has posted 2008 WJ96 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 WK96 risk assessment - see above
Noted that NEODyS has posted 2008 WK96 as an impact risk - see above
Noted that JPL Sentry has removed 2008 WY13 as an impact risk - 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 updated its 2008 WZ13 risk assessment - see above
Noted that NEODyS has updated its 2008 WZ13 risk assessment - see above
Grabbed MPEC 2008-X17 - Daily Orbit Update - see above
Grabbed MPEC 2008-X18 - 1999 VF22 - see above
Grabbed MPEC 2008-X19 - 2008 XF - see above
Grabbed MPEC 2008-X20 - 2008 XG - see above
Grabbed MPEC 2008-X21 - 2008 XH - see above
Grabbed MPEC 2008-X22 - 2008 XJ - see above
Grabbed MPEC 2008-X23 - 2008 XK - see above