Contents  on 21 October '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 21 October '08

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

When last checked at 2359 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six updated listings. All of these 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 21 October '08

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-U32 - "17:34 UT" - 2008 US

MPEC 2008-U31 - "16:01 UT" - 2008 UR

MPEC 2008-U30 - "15:57 UT" - 2008 UQ

MPEC 2008-U29 - "15:37 UT" - Comet P/2008 U1 (McMillan)

<< DOU on 21 Oct. '08 >>  MPEC 2008-U28 - "06:11 UT" - Daily Orbit Update

Observers  on 21 October '08

A total of 23 observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2008-U28 -- 2008 TK157
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPEC 2008-U28 -- 2008 UF, 2008 UB, 2008 TP10, 2008 SX245, 2008 ST7, 2008 SO1, 2008 SH82
A88Bolzaneto Obs. in Italy, 1 in MPEC 2008-U28 -- 1620
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-U28 -- 2008 TJ157
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2008-U28 -- 5143
448Desert Moon Obs. in New Mexico, 8 in MPEC 2008-U28 -- 2008 UB, 2008 TV25, 2008 TR2, 2008 TF4, 2008 TA1, 2008 SH82, 2006 VB14, 2002 XH4
113Drebach Obs. in Germany, 1 in MPEC 2008-U28 -- 1998 VO
151Eschenberg Obs. in Switzerland, 5 in MPEC 2008-U28 -- 2008 TC4, 2001 SG10, 185851, 3200, 1620
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-U28 -- 190135
A17Guidestar Obs. in Germany, 1 in MPEC 2008-U28 -- 2008 TF4
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-U28 -- 2008 SE, 137032
130Lumezzane Obs. in Italy, 4 in MPEC 2008-U28 -- 2008 MH1, 1998 SJ70, 1994 AW1, 54071
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-U28 -- 2003 EH1
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2008-U28 -- 2008 RQ24, 162186, 155140
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2008-U28, 2008-U29, 2008-U30, 2008-U31 & 2008-U32 -- 2008 US, 2008 UR, 2008 UQ, P/2008 U1, 2001 TC, 152685
E09Oakley Southern Sky Obs. in New South Wales, 1 in MPEC 2008-U28 -- 2008 QS11
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-U31 -- 2008 UR
204Schiaparelli Obs. in Italy, 9 in MPEC 2008-U28 -- 2008 UB, 2008 TM10, 2008 JZ7, 2002 SS41, 2001 UY4, 2001 TW1, 39572, 16960, 1865
510Siegen Obs. in Germany, 1 in MPEC 2008-U28 -- 137032
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2008-U28 & 2008-U29 -- P/2008 U1, 190166
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2008-U28, 2008-U29 & 2008-U30 -- 2008 UQ, P/2008 U1, 2008 TP10, 2008 TG, 2008 SW11, 2004 TU11, 2004 BE86
A97Stammersdorf Obs. in Austria, 1 in MPEC 2008-U28 -- 2008 TT26
0122Thierry Pauwels via Uccle Obs. in Belgium, 1 in MPEC 2008-U28 -- 2008 TV26
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 October '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 UCNEODyS14232014-2079132.02e-08-4.27-4.670NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/10/19.548 to 2008/10/20.404."
2008 ST7JPL Sentry14232073-2108275.1e-05-4.21-4.460JPL: "Analysis based on 102 observations spanning 25.894 days (2008-Sep-24.29993 to 2008-Oct-20.19412)." Diameter approximately 0.051 km. from mean, weighted H=24.1.
NEODyS14232074-208941.88e-07-6.51-6.660NEODyS: "Based on 108 optical observations (of which 6 are rejected as outliers) from 2008/09/24.301 to 2008/10/20.195."

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 21 October '08

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

1801Grabbed MPEC 2008-U32 - 2008 US - see above
1629Grabbed MPEC 2008-U29 - Comet P/2008 U1 (McMillan) - see above
Grabbed MPEC 2008-U30 - 2008 UQ - see above
Grabbed MPEC 2008-U31 - 2008 UR - see above
1423Noted that JPL Sentry has updated its 2008 ST7 risk assessment - see above
Noted that NEODyS has updated its 2008 ST7 risk assessment - see above
Noted that NEODyS has posted 2008 UC as an impact risk - see above
Grabbed MPEC 2008-U28 - Daily Orbit Update - see above