Contents  on 28 December '07


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 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 28 December '07

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing.

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 28 December '07

Minor Planet Electronic Circulars

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

<< DOU on 28 Dec. '07 >>  MPEC 2007-Y51 - "07:07 UT" - Daily Orbit Update

Observers  on 28 December '07

Twelve observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 19 in MPEC 2007-Y51 -- 2007 XN3, 2007 WB5, 2007 VX137, 2007 VN243, 2007 VA188, 2007 SE11, 2007 PS9, 2007 MK13, 2005 NB7, 2004 BU58, 2003 UD22, 2002 AV31, 2001 QC34, 2000 YV137, 2000 SY162, 2000 CH59, 1999 FN53, 1999 AQ10, 1990 SM
448Desert Moon Obs. in New Mexico, 5 in MPEC 2007-Y51 -- 2007 YZ, 2007 XJ20, 2007 XC10, 2007 WV4, 2007 VG184
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-Y51 -- 2007 YZ, 2007 XH16, 2007 VQ4, 2005 WJ56
J37Huelva Obs. in Spain, 1 in MPEC 2007-Y51 -- 433
J34La Fecha Obs. in Spain, 1 in MPEC 2007-Y51 -- 2007 YZ
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2007-Y51 -- 2002 TC60, 1999 FN53
A24New Millennium Obs. in Italy, 8 in MPEC 2007-Y51 -- 2007 VQ4, 2007 SP6, 2002 XY4, 68063, 25916, 170891, 3288, 1862
B49Paus Obs. in Spain, 1 in MPEC 2007-Y51 -- 2007 SP6
204Schiaparelli Obs. in Italy, 1 in MPEC 2007-Y51 -- 2007 XH16
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2007-Y51 -- 2007 XK11, 2007 WV4, 2007 TD71, 2007 SJ, 2000 WK10, 2000 EW70
A48Verona Obs. in Italy, 3 in MPEC 2007-Y51 -- 2007 YZ, 2007 YH, 2007 VQ4
198Wildberg Obs. in Germany, 1 in MPEC 2007-Y51 -- 1989 AZ

Impact Risk Monitoring  on 28 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.





Notes for Today's Latest Risk Assessments
2007 XK11JPL Sentry1447210111.2e-07-4.52-4.520JPL: "Analysis based on 55 observations spanning 22.026 days (2007-Dec-06.0886 to 2007-Dec-28.11455)." Diameter approximately 0.480 km. from mean, weighted H=19.3.

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 28 December '07

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

2143The NEOCP has become active
1447Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
Grabbed MPEC 2007-Y51 - Daily Orbit Update - see above
0520The NEOCP has become empty