Contents  on 4 December '07


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 4 December '07

The MPC's NEO Confirmation Page has 8 listings: 6 new, 2 updated

When last checked at 2346 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of twelve 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 '07

Minor Planet Electronic Circulars

As of last check at 2346 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-X18 - "14:03 UT" - 2007 XP

MPEC 2007-X17 - "13:56 UT" - 2007 XO

MPEC 2007-X16 - "13:17 UT" - 2007 XN

<< DOU on 4 Dec. '07 >>  MPEC 2007-X15 - "07:10 UT" - Daily Orbit Update

Observers  on 4 December '07

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2007-X15 -- 2007 WN3, 2007 VU83, 2007 UY1, 2007 UW3
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2007-X15, 2007-X16, 2007-X17 & 2007-X18 -- 2007 XP, 2007 XO, 2007 XN, 2007 WV4, 2007 UX1, 2007 UB6, 2005 YW55, 96189, 162004, 4450, 3288
448Desert Moon Obs. in New Mexico, 7 in MPEC 2007-X15 -- 2007 WW4, 2007 WV3, 2007 WB5, 2007 WB, 2007 VA188, 2007 SP6, 2005 UB
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2007-X15 -- 66272
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2007-X15 -- 2007 PU11, 2003 BH84
715Jornada Obs. in New Mexico, 4 in MPEC 2007-X15 -- 2007 WT4, 2007 WB, 2007 UA2, 2002 GK8
704LINEAR in New Mexico, 17 in MPEC 2007-X15 -- 2007 VA188, 2007 US6, 2007 TG15, 2007 SP6, 2007 LR32, 2005 TF49, 2002 XY4, 1998 XC9, 90403, 65706, 53426, 16834, 143678, 138971, 138852, 137084, 4954
A24New Millennium Obs. in Italy, 10 in MPEC 2007-X15 -- 2007 TG15, 2007 SE11, 2003 BH84, 1999 AQ10, 1996 TY11, 86324, 20826, 143678, 137084, 3553
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2007-X15 -- 2007 WF55
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-X15 -- 25916
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2007-X15 & 2007-X17 -- 2007 XO, 2007 WY3, 2007 WP3, 2007 WN3, 2007 VN3, 2007 VK184, 2007 VG189, 2007 TU24, 2007 SJ, 2007 RV9, 2005 YY128, 2005 OV1, 2003 YM137, 1999 VP11, 1998 VO
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPEC 2007-X15 -- 2007 WF55, 2005 XD1
926Tenagra II Obs. in Arizona, 1 in MPEC 2007-X16 -- 2007 XN
A55Vallemare di Borbona Obs. in Italy, 1 in MPEC 2007-X16 -- 2007 XN

Impact Risk Monitoring  on 4 December '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2346 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.





Notes for Today's Latest Risk Assessments
2007 WY3JPL Sentry1416210112.0e-07-3.45-3.450JPL: "Analysis based on 28 observations spanning 15.060 days (2007-Nov-18.44048 to 2007-Dec-03.50039)." Diameter approximately 0.780 km. from mean, weighted H=18.2.
2007 WP3JPL Sentry14162098-2106117.9e-06-4.65-5.080JPL: "Analysis based on 54 observations spanning 15.051 days (2007-Nov-18.26457 to 2007-Dec-03.31559)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
2007 VK184JPL Sentry14162046-2062157.2e-05-2.52-2.550JPL: "Analysis based on 80 observations spanning 22.009 days (2007-Nov-12.13904 to 2007-Dec-04.14815)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
NEODyS14162033-2074307.01e-05-2.53-2.560NEODyS: "Based on 80 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/12/04.149."
2007 TU24JPL Sentry1416R E M O V E DJPL: Risk listing removed at 1405 UTC.

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 '07

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

1416Noted that JPL Sentry has removed 2007 TU24 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
Noted that NEODyS has updated its 2007 VK184 risk assessment - see above
Noted that JPL Sentry has updated its 2007 WP3 risk assessment - see above
Noted that JPL Sentry has updated its 2007 WY3 risk assessment - see above
Noted that NEODyS has removed 2007 WY3 as an impact risk - see above
Grabbed MPEC 2007-X15 - Daily Orbit Update - see above
Grabbed MPEC 2007-X16 - 2007 XN - see above
Grabbed MPEC 2007-X17 - 2007 XO - see above
Grabbed MPEC 2007-X18 - 2007 XP - see above