Contents  on 7 December '07

Resources:

The latest news: framed access (best), RSS news feed RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 this year 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 '07

The MPC's NEO Confirmation Page has 6 listings: 3 new, 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and three updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of seven 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 '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2007-X37 - "21:53 UT" - Comet C/2007 D3 (LINEAR)


MPEC 2007-X36 - "18:34 UT" - 1998 YM4


MPEC 2007-X35 - "17:28 UT" - 2007 XK11


<< DOU on 7 Dec. '07 >>  MPEC 2007-X34 - "07:09 UT" - Daily Orbit Update

Observers  on 7 December '07

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2007-X37 -- C/2007 D3
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2007-X34, 2007-X35 & 2007-X36 -- 2007 XZ9, 2007 XK11, 2007 XD10, 2007 XC10, 2007 XA10, 2007 VW83, 1998 YM4
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2007-X34, 2007-X35 & 2007-X36 -- 2007 XK11, 2007 US6, 2001 WR1, 1999 RH33, 1998 YM4, 99907, 3671, 1862, 1620
A77Chante-Perdrix Obs. in France, 1 in MPEC 2007-X34 -- 3200
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2007-X34 -- 2005 YW55, 3553
651Grasslands Obs. in Arizona, 1 in MPEC 2007-X35 -- 2007 XK11
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2007-X34 -- 2003 BH84
701Junk Bond Obs. in Arizona, 1 in MPEC 2007-X34 -- 2007 XC10
704LINEAR in New Mexico, 4 in MPEC 2007-X34 -- 90403, 25916, 9172, 4450
130Lumezzane Obs. in Italy, 7 in MPEC 2007-X34 -- 2007 VR183, 2007 VM184, 2005 XD1, 1996 TY11, 68359, 170502, 152742
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-X34 -- 1685
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2007-X34 -- 2007 VK184, 162004, 9172
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2007-X34 -- 2007 US6, 2007 TG15, 2007 SP6, 1999 AQ10, 68359, 21374, 170891
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2007-X34 & 2007-X35 -- 2007 XK11, 2007 XC10
E12Siding Spring Survey in New South Wales, 1 in MPEC 2007-X34 -- 10563
691Spacewatch 0.9m telescope in Arizona, 12 in MPEC 2007-X34 -- 2007 VJ8, 2007 RU12, 2005 YY128, 2003 YM137, 2003 WL25, 2003 UD22, 2003 KR18, 68063, 155340, 138947, 7839, 5620
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2007-X34 -- 2007 WD5

Impact Risk Monitoring  on 7 December '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now 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
2007 XK11JPL Sentry23542011-2107895.2e-07-3.06-3.380JPL: "Analysis based on 25 observations spanning .67991 days (2007-Dec-06.0886 to 2007-Dec-06.76851)." Diameter approximately 0.538 km. from mean, weighted H=19.0.
2007 XD10NEODyS17012010-20903118.91e-08-4.20-4.740NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2007/12/05.444 to 2007/12/06.369."
JPL Sentry13452010-21071057.3e-08-4.29-4.500JPL: "Analysis based on 11 observations spanning .92495 days (2007-Dec-05.44337 to 2007-Dec-06.368319)." Diameter approximately 0.250 km. from mean, weighted H=20.6.
2007 XB10NEODyS13462011-2083164.92e-10-4.52-4.800NEODyS: "Based on 14 optical observations (of which 1 are rejected as outliers) from 2007/12/05.167 to 2007/12/06.314."
2007 XZ9NEODyS13462056-208941.56e-06-5.73-6.080NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/06.299."
JPL Sentry13452056-208931.4e-06-5.78-6.060JPL: "Analysis based on 31 observations spanning 2.1041 days (2007-Dec-04.19408 to 2007-Dec-06.29819)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2007 XP3JPL Sentry23542027-2106132.0e-09-4.83-5.640JPL: "Analysis based on 11 observations spanning 1.0459 days (2007-Dec-04.38257 to 2007-Dec-05.42847)." Diameter approximately 0.723 km. from mean, weighted H=18.4.
2007 WY3JPL Sentry0132210111.8e-07-3.49-3.490JPL: "Analysis based on 37 observations spanning 16.888 days (2007-Nov-18.44048 to 2007-Dec-05.32828)." Diameter approximately 0.770 km. from mean, weighted H=18.2.
2007 VK184NEODyS13462036-2069227.75e-05-2.48-2.490NEODyS: "Based on 87 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/12/06.253."
JPL Sentry13452046-2062137.9e-05-2.47-2.480JPL: "Analysis based on 87 observations spanning 24.113 days (2007-Nov-12.13904 to 2007-Dec-06.2525)." Diameter approximately 0.130 km. from mean, weighted H=22.0.

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 '07

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

2354Noted that JPL Sentry has posted 2007 XK11 as an impact risk - see above
Noted that JPL Sentry has posted 2007 XP3 as an impact risk - see above
Grabbed MPEC 2007-X37 - Comet C/2007 D3 (LINEAR) - see above
1903Grabbed MPEC 2007-X36 - 1998 YM4 - see above
1758Grabbed MPEC 2007-X35 - 2007 XK11 - see above
1700Noted that NEODyS has posted 2007 XD10 as an impact risk - see above
1346Noted that NEODyS has updated its 2007 VK184 risk assessment - see above
Grabbed MPEC 2007-X34 - Daily Orbit Update - see above
1345Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
Noted that NEODyS has posted 2007 XB10 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 XD10 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above
Noted that NEODyS has posted 2007 XZ9 as an impact risk - see above
0132Noted that JPL Sentry has updated its 2007 WY3 risk assessment - see above