Contents  on 4 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 4 December '08

The MPC's NEO Confirmation Page has 12 listings: 7 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven new and five updated listings. All of these 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 4 December '08

Minor Planet Electronic Circulars

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


MPEC 2008-X38 - "14:26 UT" - 2008 XM1


MPEC 2008-X37 - "14:11 UT" - 2008 XL1


MPEC 2008-X36 - "14:09 UT" - 2008 XK1


<< DOU on 4 Dec. '08 >>  MPEC 2008-X35 - "07:10 UT" - Daily Orbit Update

Observers  on 4 December '08

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2008-X35 -- 2006 SZ217
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2008-X35 & 2008-X38 -- 2008 XM1, 2008 WL60, 2008 WG14, 2008 WC14, 2008 VU4, 2007 BT2, 36236, 20460, 136923, 12711
379Hamamatsu-Yuto Obs. in Japan, 9 in MPEC 2008-X35 -- 2008 VU4, 2008 VK14, 2008 UE7, 2008 SQ1, 2008 MZ, 2006 VB14, 2006 SZ217, 2005 TZ51, 2001 WA25
704LINEAR in New Mexico, 7 in MPEC 2008-X35 -- 2008 UC95, 2004 XK3, 162004, 136923, 6239, 3122, 1627
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2008-X35, 2008-X36, 2008-X37 & 2008-X38 -- 2008 XM1, 2008 XL1, 2008 XK1, 2008 XC1
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-X35, 2008-X36 & 2008-X37 -- 2008 XL1, 2008 XK1, 2008 WF96, 2006 VB14, 2003 HB6, 1998 SJ70, 54690, 137044
A24New Millennium Obs. in Italy, 1 in MPEC 2008-X35 -- 2008 XB1
473Remanzacco Obs. in Italy, 1 in MPEC 2008-X36 -- 2008 XK1
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-X38 -- 2008 XM1
434San Benedetto Po Obs. in Italy, 3 in MPEC 2008-X35 -- 2001 LM5, 85236, 162900
H36Sandlot Obs. in Kansas, 1 in MPEC 2008-X35 -- 2008 XB1
E12Siding Spring Survey (SSS) in New South Wales, 10 in MPEC 2008-X35 -- 2008 WY94, 2008 WD14, 2008 LW16, 2008 HE3, 2008 GV20, 2006 WY2, 2004 XY60, 161989, 4596, 1036
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2008-X35 -- 2003 YX1, 2003 YO1, 1994 XG, 190166, 137052, 136923, 7480
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2008-X35 & 2008-X37 -- 2008 XL1, 2002 EZ2
B39Tradate Obs. in Italy, 3 in MPEC 2008-X35 -- 2008 WL60, 2008 WB59, 2008 UE7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 XM1JPL Sentry22292010-2108961.4e-07-4.11-4.320JPL: "Analysis based on 13 observations spanning .17221 days (2008-Dec-04.24125 to 2008-Dec-04.41346)." Diameter approximately 0.192 km. from mean, weighted H=21.2.
2008 XC1JPL Sentry13552046-2106507.3e-06-4.39-5.040JPL #2 for the day: "Analysis based on 17 observations spanning .89273 days (2008-Dec-03.36799 to 2008-Dec-04.26072)." Diameter approximately 0.077 km. from mean, weighted H=23.2.
NEODyS13552046-2088203.23e-06-4.70-5.330NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/12/03.369 to 2008/12/04.261."
2008 XONEODyS13552024-207542.5e-09-7.64-7.800NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/12/02.420 to 2008/12/03.391."
2008 XNNEODyS13552010-204152.37e-08-3.87-3.870NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/02.361 to 2008/12/03.313."
2008 XBNEODyS18282021-206421.82e-08-6.54-6.540NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2008/12/01.135 to 2008/12/01.210."
2008 WY94JPL Sentry13552045-207487.5e-06-5.68-5.800JPL: "Analysis based on 25 observations spanning 3.9252 days (2008-Nov-29.54021 to 2008-Dec-03.46541)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
NEODyS13552068-2085111.04e-05-5.53-5.630NEODyS: "Based on 26 optical observations (of which 1 are rejected as outliers) from 2008/11/29.541 to 2008/12/03.466."

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 4 December '08

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

2229Noted that JPL Sentry has posted 2008 XM1 as an impact risk - see above
1828Noted that NEODyS has posted 2008 XB as an impact risk - see above
1500Grabbed MPEC 2008-X36 - 2008 XK1 - see above
Grabbed MPEC 2008-X37 - 2008 XL1 - see above
Grabbed MPEC 2008-X38 - 2008 XM1 - see above
1355Noted 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 XC1 risk assessment - see above
Noted that NEODyS has posted 2008 XC1 as an impact risk - see above
Noted that NEODyS has posted 2008 XN as an impact risk - see above
Noted that NEODyS has posted 2008 XO as an impact risk - see above
Grabbed MPEC 2008-X35 - Daily Orbit Update - see above
0201Noted that JPL Sentry has posted 2008 XC1 as an impact risk - see above