8 Dec '07 Tracking News

Contents on 8 December '07

IAU Minor Planet Center
- NEOCP Activity -- ten listings: 5 new, 5 updated
- New MPECs -- one MPEC
- Observers -- ten observing facilities
Impact Risk Monitoring -- two objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
Ephemerides for risk-rated and nearby objects
Old & new CRT Archive
Old News Archive & Small Objects Archive

The latest news: framed access (best), 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 8 December '07

The MPC's NEO Confirmation Page has 10 listings: 5 new, 5 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five new and five updated listings. Of these, eight were "one nighters."

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 8 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 8 Dec. '07 >> MPEC 2007-X38 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K07X11K 2007 XK11 (Q=4.457 AU, arc=2 days, H=19.0 ~537m) from Great Shefford Obs. (Dec. 7.91p2)
Observations of recently (no longer) risk-listed objects
K07W55E 2007 WE55 (arc=7 days, H=20.0 ~339m) from Verona Obs. (Dec. 5.90-91p4)
K07W04V 2007 WV4 (i=38.3°, arc=17 days, H=19.1 ~513m) from Verona Obs. (Dec. 5.92-93p4)
Observations of small asteroids (H>22.0)
K07V03D 2007 VD3 (arc=34 days, H=22.1 ~129m) from Astronomical Research Obs. (ARO) (Dec. 6.10-11p4)
Observations of almost-small asteroids (21.7<H<=22.0)
K07X03Q 2007 XQ3 (arc=2 days, H=21.9 ~141m) from the Spacewatch 0.9m telescope (Dec. 6.40-44p3)
Observations of other objects
K07X09Y 2007 XY9 (arc=4 days, H=21.0 ~214m) from Great Shefford Obs. (Dec. 7.90p3)
K07X03N 2007 XN3 (Q=4.085 AU, arc=5 days, H=20.5 ~269m) from ARO (Dec. 6.08-09p3) and Great Shefford Obs. (Dec. 7.92-94p3)
K07W55F 2007 WF55 (arc=7 days, H=19.1 ~513m) from Verona Obs. (Dec. 5.88-89p4)
K07VO3O 2007 VO243 (arc=21 days, H=19.4 ~446m) from ARO (Dec. 6.23-26p4)
K07VI3R 2007 VR183 (Q=4.353 AU, arc=83 days, H=17.3 ~1.17 km) from the Catalina Sky Survey (CSS) (Dec. 6.21-23p4)
K07V07X 2007 VX7 (arc=32 days, H=19.5 ~426m) from ARO (Dec. 6.14-15p3)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from Hamamatsu-Yuto Obs. (Dec. 7.54p2)
K07T18X 2007 TX18 (arc=2 opp, H=17.2 ~1.23 km) from Rob Matson using the Siding Spring Digitized Sky Survey (1991 April 13.56p1 & 1991 April 13.60p1) and ARO (Dec. 6.18-19p3)
K07S11E 2007 SE11 (i=48.3°, arc=76 days, H=17.8 ~933m) from Verona Obs. (Dec. 5.83-85p4)
K07G03S 2007 GS3 (arc=2 opp, H=19.4 ~446m) from the Siding Spring Survey (SSS) (Dec. 7.66-70p4)
K06W02Y 2006 WY2 (arc=2 opp, H=18.6 ~645m) from SSS (Dec. 7.53-55p3)
K04XG4P 2004 XP164 (arc=3 opp, H=17.5 ~1.07 km) from SSS (Dec. 7.62-64p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.8 ~1.48 km) from Hamamatsu-Yuto Obs. (Dec. 4.53p2 & 7.50-52p4)
E3678 143678 2003 SA224 from Balzaretto Obs. (Dec. 6.79-81p4)
99935 99935 2002 AV4 from Montana Blanca Obs. (Dec. 7.81p3)
66959 66959 1999 XO35 from Balzaretto Obs. (Dec. 6.83-85p3)

Observers on 8 December '07

Ten observing facilities appear in today's MPEC.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 5 in MPEC 2007-X38 -- 2007 XN3, 2007 VX7, 2007 VO243, 2007 VD3, 2007 TX18
`A81`	Balzaretto Obs. in Italy, 2 in MPEC 2007-X38 -- 66959, 143678
`703`	Catalina Sky Survey in Arizona, 1 in MPEC 2007-X38 -- 2007 VR183
`J95`	Great Shefford Obs. in England, 3 in MPEC 2007-X38 -- 2007 XY9, 2007 XN3, 2007 XK11
`379`	Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2007-X38 -- 2007 US6, 2003 BH84
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-X38 -- 99935
`260&`	Rob Matson in California using the Siding Spring Digitized Sky Survey in New South Wales, 1 in MPEC 2007-X38 -- 2007 TX18
`E12`	Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2007-X38 -- 2007 GS3, 2006 WY2, 2004 XP164
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-X38 -- 2007 XQ3
`A48`	Verona Obs. in Italy, 4 in MPEC 2007-X38 -- 2007 WV4, 2007 WF55, 2007 WE55, 2007 SE11

Impact Risk Monitoring on 8 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 XK11	JPL Sentry	1449	2019-2106	51	1.8e-07	-3.85	-4.45	0	JPL: "Analysis based on 27 observations spanning 1.8235 days (2007-Dec-06.0886 to 2007-Dec-07.91211)." Diameter approximately 0.554 km. from mean, weighted H=18.9.
2007 XK11	NEODyS	1449	2019-2085	9	4.66e-08	-4.34	-4.60	0	NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/07.913."

2007 XP3	NEODyS	1449	2026-2089	8	1.42e-09	-4.95	-5.34	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2007/12/04.383 to 2007/12/05.429."

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 8 December '07

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

1449	Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above Noted that NEODyS has posted 2007 XK11 as an impact risk - see above Noted that NEODyS has posted 2007 XP3 as an impact risk - see above Grabbed MPEC 2007-X38 - Daily Orbit Update - see above

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