9 Dec '07 Tracking News

Contents on 9 December '07

IAU Minor Planet Center
- NEOCP Activity -- ten listings: 5 new, 5 updated
- New MPECs -- one MPEC
- Observers -- seven 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 9 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, six 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 9 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 9 Dec. '07 >> MPEC 2007-X39 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K07X09Z 2007 XZ9 (small asteroid, arc=5 days, H=24.8 ~37m) from Great Shefford Obs. (Dec. 9.03-04p2)
K07X03P 2007 XP3 (q=0.225 AU, Q=4.868 AU, arc=2 days, H=18.9 ~562m) from Astronomical Research Obs. (ARO) (Dec. 6.39-40p3)
Observations of small asteroids (H>22.0)
K07X00P 2007 XP (arc=2 days, H=23.7 ~62m) from ARO (Dec. 6.35p3)
K07R01E 2007 RE1 (Q=4.270 AU, arc=95 days, H=22.1 ~129m) from ARO (Dec. 6.43-44p2)
Observations of almost-small asteroids (21.7<H<=22.0)
K07X03Q 2007 XQ3 (arc=2 days, H=21.9 ~141m) from ARO (Dec. 6.38-39p3)
Observations of other objects
K07X03T 2007 XT3 (arc=1 day, H=21.4 ~178m) from ARO (Dec. 6.20-21p3)
K07X00N 2007 XN (arc=3 days, H=19.9 ~355m) from ARO (Dec. 6.47p3)
K07W55F 2007 WF55 (arc=10 days, H=19.1 ~513m) from Capannoli Obs. (Dec. 9.01-02p2)
K07V04Q 2007 VQ4 (arc=35 days, H=16.0 ~2.14 km, q=1.271 AU) from Hamamatsu-Yuto Obs. (Dec. 8.70p1 & 8.75-76p3)
K07U51Q 2007 UQ51 (arc=36 days, H=20.2 ~309m) from ARO (Dec. 6.12-13p3)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from Green Island Obs. (Dec. 7.77p1 & 7.85p1)
K07S06P 2007 SP6 (arc=78 days, H=18.2 ~776m) from Hamamatsu-Yuto Obs. (Dec. 8.65-67p4) and Capannoli Obs. (Dec. 8.98-99p3)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Hamamatsu-Yuto Obs. (Dec. 8.58-60p5)
K04S20B 2004 SB20 (arc=2 opp, H=18.5 ~676m) from ARO (Nov. 27.42-43p3)
K04D00C 2004 DC (arc=2 opp, H=18.2 ~776m) from ARO (Dec. 6.40-42p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.8 ~1.48 km) from Hamamatsu-Yuto Obs. (Dec. 8.53-57p6)
K03A02Z 2003 AZ2 (arc=3 opp, H=18.3 ~741m) from ARO (Dec. 6.36-37p3)
K02RB8C 2002 RC118 (Q=4.624 AU, arc=2 opp, H=16.7 ~1.55 km) from the Siding Spring Survey (SSS) (Dec. 8.54-58p4)
85275 85275 1994 LY from SSS (Dec. 8.53-57p3)
68359 68359 2001 OZ13 from Ametlla del Valles Obs. (Dec. 7.08p1)

Observers on 9 December '07

Seven observing facilities appear in today's MPEC.

Code	Observer / observatory
`B37`	Ametlla del Valles Obs. in Spain, 1 in MPEC 2007-X39 -- 68359
`H55`	Astronomical Research Obs. (ARO) in Illinois, 10 in MPEC 2007-X39 -- 2007 XT3, 2007 XQ3, 2007 XP3, 2007 XP, 2007 XN, 2007 UQ51, 2007 RE1, 2004 SB20, 2004 DC, 2003 AZ2
`B09`	Capannoli Obs. in Italy, 2 in MPEC 2007-X39 -- 2007 WF55, 2007 SP6
`J95`	Great Shefford Obs. in England, 1 in MPEC 2007-X39 -- 2007 XZ9
`B34`	Green Island Obs. in Cyprus, 1 in MPEC 2007-X39 -- 2007 US6
`379`	Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-X39 -- 2007 VQ4, 2007 SP6, 2007 PU11, 2003 BH84
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-X39 -- 2002 RC118, 85275

Impact Risk Monitoring on 9 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 XZ9	JPL Sentry	1508	2056-2089	4	1.5e-06	-5.77	-6.04	0	JPL: "Analysis based on 33 observations spanning 4.8453 days (2007-Dec-04.19408 to 2007-Dec-09.0394)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2007 XZ9	NEODyS	1508	2056-2089	7	1.68e-06	-5.70	-6.06	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/09.040."

2007 XP3	JPL Sentry	1508	2033-2104	17	2.2e-08	-3.87	-4.52	0	JPL: "Analysis based on 14 observations spanning 2.0150 days (2007-Dec-04.38257 to 2007-Dec-06.397618)." Diameter approximately 0.701 km. from mean, weighted H=18.4.
2007 XP3	NEODyS	1508	2033-2071	14	2.16e-08	-3.90	-4.47	0	NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2007/12/04.383 to 2007/12/06.398."

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 9 December '07

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

1508	Noted that NEODyS has updated its 2007 XP3 risk assessment - see above Noted that NEODyS has updated its 2007 XZ9 risk assessment - see above
1507	Noted that JPL Sentry has updated its 2007 XP3 risk assessment - see above Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above Grabbed MPEC 2007-X39 - Daily Orbit Update - see above

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