2 Dec '07 Tracking News

Contents on 2 December '07

IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- one MPEC
- Observers -- ten observing facilities
Impact Risk Monitoring -- three 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 2 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 2 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 2 Dec. '07 >> MPEC 2007-X07 - "07:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K07W03P 2007 WP3 (small asteroid, arc=10 days, H=23.5 ~68m) from Astronomical Research Obs. (ARO) (Nov. 28.25-26p3)
K07VO3N 2007 VN243 (small asteroid, arc=15 days, H=22.3 ~117m) from ARO (Nov. 28.22-23p3 & 30.22-23p3)
K07VI4K 2007 VK184 (almost small, arc=16 days, H=22.0 ~135m) from ARO (Nov. 28.15-16p3)
Observations of recently (no longer) risk-listed objects
K07W55E 2007 WE55 (arc=3 days, H=19.9 ~355m) from Great Shefford Obs. (Dec. 1.81p3)
K07W04V 2007 WV4 (i=38.2°, arc=11 days, H=19.2 ~490m) from ARO (Nov. 28.29p1) and Stia Obs. (Nov. 29.93-95p3)
K07VI9G 2007 VG189 (arc=17 days, H=19.2 ~490m) from ARO (Nov. 30.28-30p3)
K07VD7W 2007 VW137 (arc=22 days, H=18.1 ~812m) from Stia Obs. (Nov. 30.74-75p4)
K07V85A 2007 VA85 (i=132.5°, Q=7.203 AU, arc=27 days, H=15.1 ~3.23 km, q=1.101 AU) from Lumezzane Obs. (Nov. 30.74-75p2)
Observations of small asteroids (H>22.0)
K07W04Z 2007 WZ4 (arc=11 days, H=24.4 ~45m) from Pla D'Arguines Obs. (Nov. 30.88-90p3)
K07U06P 2007 UP6 (arc=39 days, H=23.1 ~81m) from ARO (Nov. 30.01-03p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K07VI4H 2007 VH184 (Q=4.099 AU, arc=17 days, H=21.9 ~141m) from ARO (Nov. 28.24p3)
K07U12S 2007 US12 (arc=31 days, H=22.0 ~135m) from ARO (Nov. 30.08-11p3 at V=22.1-3)
Observations of other objects
K07W55F 2007 WF55 (arc=3 days, H=18.9 ~562m) from Skylive Obs. (Dec. 1.00-01p2), Mataro Obs. (Dec. 1.01-02p3), and Great Shefford Obs. (Dec. 1.83p3)
K07W05B 2007 WB5 (arc=10 days, H=18.9 ~562m) from ARO (Nov. 27.22p1 & 28.19-20p3)
K07VO3M 2007 VM243 (arc=15 days, H=21.0 ~214m) from ARO (Nov. 30.04-05p3)
K07VI6H 2007 VH186 (arc=19 days, H=20.1 ~323m) from ARO (Nov. 30.11p3)
K07VI3R 2007 VR183 (Q=4.353 AU, arc=77 days, H=17.3 ~1.17 km) from Petit Jean Mtn. South Obs. (PJMSO) (Nov. 30.17-18p5)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from Hamamatsu-Yuto Obs. (Dec. 1.59-62p4)
K07U06B 2007 UB6 (arc=40 days, H=19.8 ~371m) from ARO (Nov. 28.17-18p3)
K07U03W 2007 UW3 (arc=42 days, H=19.4 ~446m) from ARO (Nov. 28.27-28p3 & 30.31-32p3)
K07T08K 2007 TK8 (arc=54 days, H=21.0 ~214m) from ARO (Nov. 28.13-14p3) and Pla D'Arguines Obs. (Nov. 30.77-78p5)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from PJMSO (Nov. 30.18-19p5) and Hamamatsu-Yuto Obs. (Dec. 1.63-65p5)
K05Y55W 2005 YW55 (arc=4 opp, H=19.4 ~446m) from Stia Obs. (Nov. 30.77-79p4)
K03B84H 2003 BH84 (arc=2 opp, H=17.0 ~1.35 km) from Mataro Obs. (Nov. 30.99p3) and Hamamatsu-Yuto Obs. (Dec. 1.44-50p11)
H0903 170903 2004 WS2 from Stia Obs. (Nov. 30.81-82p4)
H0891 170891 2004 TY16 from Stia Obs. (Nov. 30.83-85p5)
F3201 153201 2000 WO107 from Inastars Obs. (Dec. 2.06-07p5)
D8947 138947 2001 BA40 from Inastars Obs. (Dec. 2.04-05p3)

Observers on 2 December '07

Ten observing facilities appear in today's MPEC.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 14 in MPEC 2007-X07 -- 2007 WV4, 2007 WP3, 2007 WB5, 2007 VN243, 2007 VM243, 2007 VK184, 2007 VH186, 2007 VH184, 2007 VG189, 2007 UW3, 2007 US12, 2007 UP6, 2007 UB6, 2007 TK8
`J95`	Great Shefford Obs. in England, 2 in MPEC 2007-X07 -- 2007 WF55, 2007 WE55
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2007-X07 -- 2007 US6, 2007 PU11, 2003 BH84
`B15`	Inastars Obs. in Germany, 2 in MPEC 2007-X07 -- 153201, 138947
`130`	Lumezzane Obs. in Italy, 1 in MPEC 2007-X07 -- 2007 VA85
`A06`	Mataro Obs. in Spain, 2 in MPEC 2007-X07 -- 2007 WF55, 2003 BH84
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2007-X07 -- 2007 VR183, 2007 PU11
`941`	Pla D'Arguines Obs. in Spain, 2 in MPEC 2007-X07 -- 2007 WZ4, 2007 TK8
`B40`	Skylive Obs. in Italy, 1 in MPEC 2007-X07 -- 2007 WF55
`A78`	Stia Obs. in Italy, 5 in MPEC 2007-X07 -- 2007 WV4, 2007 VW137, 2005 YW55, 170903, 170891

Impact Risk Monitoring on 2 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 WP3	JPL Sentry	1509	2104-2106	10	5.6e-06	-4.82	-5.32	0	JPL: "Analysis based on 47 observations spanning 9.9983 days (2007-Nov-18.26457 to 2007-Nov-28.262845)." Diameter approximately 0.066 km. from mean, weighted H=23.6.

2007 VN243	JPL Sentry	1509	R E M O V E D						JPL: Risk listing removed at 1252 UTC.
2007 VN243	NEODyS	1509	R E M O V E D

2007 VK184	JPL Sentry	1509	2046-2062	17	5.8e-05	-2.64	-2.84	0	JPL: "Analysis based on 71 observations spanning 16.024 days (2007-Nov-12.13904 to 2007-Nov-28.163092)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
2007 VK184	NEODyS	1509	2041-2074	24	5.8e-05	-2.64	-2.85	0	NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/11/28.164."

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 2 December '07

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

1509

Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
Noted that NEODyS has updated its 2007 VK184 risk assessment - see above
Noted that JPL Sentry has removed 2007 VN243 as an impact risk - see above
Noted that NEODyS has removed 2007 VN243 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 WP3 risk assessment - see above
Grabbed MPEC 2007-X07 - Daily Orbit Update - see above

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