Contents  on 29 December '08


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 29 December '08

The MPC's NEO Confirmation Page has 5 listings: 2 new, 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and three updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of nine 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 29 December '08

Minor Planet Electronic Circulars

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

MPEC 2008-Y63 - "23:41 UT" - 2008 YM27

MPEC 2008-Y62 - "19:11 UT" - 2008 YG26

<< DOU on 29 Dec. '08 >>  MPEC 2008-Y61 - "07:07 UT" - Daily Orbit Update

Observers  on 29 December '08

A total of 25 observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-Y62 -- 2008 YG26
B60Deep Sky Obs. in Germany, 1 in MPEC 2008-Y61 -- 1627
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-Y61 -- 2008 YE3, 2008 XE2, 2008 WQ63, 2008 TQ2
113Drebach Obs. in Germany, 4 in MPEC 2008-Y61 -- 2008 UC, 2008 SQ1, 2008 SH82, 2008 QT3
639Dresden Obs. in Germany, 1 in MPEC 2008-Y61 -- 2004 LV3
J95Great Shefford Obs. in England, 1 in MPEC 2008-Y61 -- 2008 YC3
A17Guidestar Obs. in Germany, 3 in MPECs 2008-Y61 & 2008-Y62 -- 2008 YG26, 2008 YF3, 2008 WL
379Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2008-Y61 -- 2008 YK2, 2008 WQ63, 2008 WL60, 2008 SH82, 2004 LV3
240Herrenberg Obs. in Germany, 2 in MPEC 2008-Y61 -- 163683, 153201
B15Inastars Obs. in Germany, 7 in MPEC 2008-Y61 -- 2008 QT3, 2004 DG2, 1994 AW1, 36236, 163683, 162361, 137805
704LINEAR in New Mexico, 1 in MPEC 2008-Y63 -- 2008 YM27
540Linz Obs. in Austria, 1 in MPEC 2008-Y61 -- 2008 XP
130Lumezzane Obs. in Italy, 10 in MPEC 2008-Y61 -- 2008 YK2, 2008 XV2, 2008 WN2, 2008 UC, 1999 YF3, 89355, 52762, 200754, 162361, 2368
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2008-Y61 & 2008-Y62 -- 2008 YG26, 2008 YC3
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2008-Y61 -- 2008 XE2
A13Naef Obs. in Switzerland, 4 in MPEC 2008-Y61 -- 2008 XV2, 2007 VL8, 2001 WT1, 141765
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2008-Y61 -- 2008 XP2, 2008 XE2, 2008 WQ63, 2008 UC95, 2008 MB5, 2008 EV5, 2005 BC, 2002 XP90
473Remanzacco Obs. in Italy, 1 in MPEC 2008-Y63 -- 2008 YM27
H11Rodeo Obs. in New Mexico, 1 in MPEC 2008-Y61 -- 2008 WQ63
145S-Gravenwezel Obs. in Belgium, 1 in MPEC 2008-Y61 -- 2008 EV5
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-Y62 -- 2008 YG26
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-Y61 -- 2008 YA, 2004 XY60
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2008-Y61 -- 2008 VB1, 2008 SJ82
611Starkenburg Obs. in Germany, 2 in MPECs 2008-Y62 & 2008-Y63 -- 2008 YM27, 2008 YG26
H53Thompsonville Obs. in Illinois, 3 in MPEC 2008-Y61 -- 2004 LV3, 162900, 1980
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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.





Notes for Today's Latest Risk Assessments
2008 YC3JPL Sentry15282070-2107282.7e-04-4.24-4.910JPL: "Analysis based on 21 observations spanning 6.8814 days (2008-Dec-22.25277 to 2008-Dec-29.13413)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS15282085-2090114.97e-05-4.92-5.380NEODyS: "Based on 25 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2008/12/29.135."

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 29 December '08

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

2358Grabbed MPEC 2008-Y63 - 2008 YM27 - see above
1958Grabbed MPEC 2008-Y62 - 2008 YG26 - see above
1528Noted that JPL Sentry has updated its 2008 YC3 risk assessment - see above
Noted that NEODyS has reposted 2008 YC3 as an impact risk - see above
Grabbed MPEC 2008-Y61 - Daily Orbit Update - see above
0525Noted that the NEOCP has become active