Contents  on 16 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 16 December '07

The MPC's NEO Confirmation Page has 18 listings: 9 new, 9 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had nine new and nine updated listings. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 23 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 16 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-Y04 - "17:09 UT" - 2007 XW23


MPEC 2007-Y03 - "17:03 UT" - 2007 XV23


<< DOU on 16 Dec. '07 >>  MPEC 2007-Y02 - "07:12 UT" - Daily Orbit Update


MPEC 2007-Y01 - "03:11 UT" - 2007 XT23

Observers  on 16 December '07

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPEC 2007-Y02 -- 2007 XJ16, 2007 XD10, 2007 UR, 2007 TC23, 2004 AR1, 22099, 5836
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2007-Y02 -- 2005 WJ56, 153201, 1620
703Catalina Sky Survey in Arizona, 1 in MPEC 2007-Y02 -- 2007 XY9
A77Chante-Perdrix Obs. in France, 1 in MPEC 2007-Y02 -- 4450
J95Great Shefford Obs. in England, 1 in MPEC 2007-Y01 -- 2007 XT23
A17Guidestar Obs. in Germany, 2 in MPECs 2007-Y01 & 2007-Y02 -- 2007 XT23, 2007 XC10
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-Y02 -- 2007 VQ4, 2007 SP6, 2007 PU11, 2003 BH84
704LINEAR in New Mexico, 9 in MPECs 2007-Y02 & 2007-Y03 -- 2007 XV23, 2007 RU12, 2004 BD85, 68063, 34613, 18736, 153201, 144411, 5131
J34La Fecha Obs., 3 in MPEC 2007-Y02 -- 2007 WF55, 2005 XD1, 4954
A06Mataro Obs. in Spain, 1 in MPEC 2007-Y02 -- 170903
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2007-Y01, 2007-Y02, 2007-Y03 & 2007-Y04 -- 2007 XW23, 2007 XV23, 2007 XT23, 2005 XL80, 19764, 169675, 162004, 141079
233San Vito Obs. in Italy, 1 in MPEC 2007-Y02 -- 4954
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2007-Y02 -- 25916, 13651
291Spacewatch 1.8m telescope in Arizona, 12 in MPEC 2007-Y02 -- 2007 XP3, 2007 XK11, 2007 XB10, 2007 WT4, 2007 WP3, 2007 WM3, 2007 VW137, 2007 VK184, 2007 VH186, 2006 RJ1, 2005 YQ96, 2005 FE3
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-Y01 -- 2007 XT23
J71Willow Bank Obs. in England, 1 in MPEC 2007-Y02 -- 153591

Impact Risk Monitoring  on 16 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 XB23NEODyS15012069-208634.21e-08-8.77-9.080NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2007/12/14.563 to 2007/12/15.480."
2007 XJ16JPL Sentry14012010-2107893.5e-07-2.58-2.640JPL: "Analysis based on 18 observations spanning 8.9881 days (2007-Dec-05.38279 to 2007-Dec-14.370881)." Diameter approximately 0.633 km. from mean, weighted H=18.6.
NEODyS14012010-2089513.42e-07-2.59-2.670NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2007/12/05.384 to 2007/12/14.372."
2007 XK11JPL Sentry14012064-210128.8e-08-4.43-4.510JPL: "Analysis based on 39 observations spanning 9.9980 days (2007-Dec-06.0886 to 2007-Dec-16.08663)." Diameter approximately 0.495 km. from mean, weighted H=19.2.
NEODyS14012045-206426.93e-08-4.51-4.710NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/16.087."
2007 XB10JPL Sentry15012054-2107136.2e-09-4.67-5.190JPL: "Analysis based on 19 observations spanning 11.085 days (2007-Dec-05.16649 to 2007-Dec-16.25179)." Diameter approximately 0.931 km. from mean, weighted H=17.8.
NEODyS14012045-2089258.81e-09-4.49-5.100NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2007/12/05.167 to 2007/12/16.253."
2007 XP3NEODyS14022057-205937.41e-07-2.48-2.740NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2007/12/04.383 to 2007/12/15.282."
JPL Sentry14012057-205924.1e-07-2.76-2.840JPL: "Analysis based on 19 observations spanning 10.899 days (2007-Dec-04.38257 to 2007-Dec-15.28134)." Diameter approximately 0.636 km. from mean, weighted H=18.6.
2007 WP3JPL Sentry14012098-210585.4e-06-4.81-5.160JPL: "Analysis based on 60 observations spanning 26.940 days (2007-Nov-18.26457 to 2007-Dec-15.20424)." Diameter approximately 0.066 km. from mean, weighted H=23.5.
2007 VK184NEODyS15012048-205742.34e-04-1.99-2.001NEODyS: "Based on 93 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/12/16.175. NOTE: The Virtual Impactor in 2048/06/03.087 in the table above is rated as Torino Scale 1."

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 16 December '07

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

1748Grabbed MPEC 2007-Y03 - 2007 XV23 - see above
Grabbed MPEC 2007-Y04 - 2007 XW23 - see above
1501Noted that NEODyS has updated its 2007 VK184 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XB10 risk assessment - see above
Noted that NEODyS has posted 2007 XB23 as an impact risk - see above
1402Noted that NEODyS has updated its 2007 XP3 risk assessment - see above
Grabbed MPEC 2007-Y02 - Daily Orbit Update - see above
1401Noted that JPL Sentry has updated its 2007 WP3 risk assessment - see above
Noted that NEODyS has updated its 2007 XB10 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XJ16 risk assessment - see above
Noted that NEODyS has updated its 2007 XJ16 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
Noted that NEODyS has updated its 2007 XK11 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XP3 risk assessment - see above
0444Grabbed MPEC 2007-Y01 - 2007 XT23 - see above