24 Oct '07 Tracking News

Contents on 24 October '07

IAU Minor Planet Center
- NEOCP Activity -- five listings: 5 updated
- New MPECs -- one MPEC
- Observers -- nine observing facilities
Impact Risk Monitoring -- four objects reported
Chronology

Resources:

Consolidated Risk Tables - CRT page
Old & new CRT Archive
Ephemerides for risk-rated objects
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 24 October '07

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

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of seven 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 24 October '07

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 24 Oct. '07 >> MPEC 2007-U70 - "06:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K07U06D 2007 UD6 (small asteroid, arc=3 days, H=28.4 ~7m) from Libbiano Obs. (Oct. 20.00-01p4) and the Spacewatch 1.8m telescope (Oct. 23.28-29p6)
K07U03T 2007 UT3 (small asteroid, arc=4 days, H=25.9 ~22m) from Shenton Park Obs. (Oct. 23.67p4)
K07T23B 2007 TB23 (i=38.3°, arc=13 days, H=18.6 ~645m) from Spacewatch 1.8m (Oct. 23.23-24p6)
Observations of recently (no longer) risk-listed objects
K07T66C 2007 TC66 (arc=11 days, H=19.4 ~446m) from Shenton Park Obs. (Oct. 23.72-73p4)
Observations of small asteroids (H>22.0)
K07U06F 2007 UF6 (arc=2 days, H=25.8 ~23m) from Shenton Park Obs. (Oct. 23.71-72p6)
Observations of other objects
K07U03V 2007 UV3 (q=0.284 AU, arc=4 days, H=19.3 ~467m) from Hibiscus Obs. (Oct. 22.59-60p6)
K07U00T 2007 UT (i=45.6°, arc=6 days, H=21.5 ~170m) from Shenton Park Obs. (Oct. 23.68-69p6)
K07T24V 2007 TV24 (arc=10 days, H=17.8 ~933m) from LINEAR (Oct. 21.32-36p8)
K07T19S 2007 TS19 (arc=13 days, H=20.7 ~245m) from Shenton Park Obs. (Oct. 23.54p6)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from LINEAR (Oct. 21.31-34p8) and Atlante Obs. (Oct. 22.92-94p6)
K07L32R 2007 LR32 (arc=150 days, H=17.2 ~1.23 km) from Hormersdorf Obs. (Oct. 8.77p10)
K03A23E 2003 AE23 (arc=2 opp, H=18.2 ~776m) from Andrushivka Obs. (Oct. 16.75-79p4) and the Spacewatch 0.9m telescope (Oct. 19.11-15p6)
K02RB8C 2002 RC118 (Q=4.624 AU, arc=2 opp, H=16.7 ~1.55 km) from Atlante Obs. (Oct. 22.90-92p6) and Spacewatch 0.9m (Oct. 23.26-29p6)
52768 52768 1998 OR2 from Spacewatch 0.9m (Oct. 20.24-28p6)
03757 3757 1982 XB from Spacewatch 0.9m (Oct. 19.47-50p6)
02212 2212 Hephaistos (1978 SB) from Atlante Obs. (Oct. 22.88-89p6)

Observers on 24 October '07

Nine observing facilities appear in today's MPEC.

Code	Observer / observatory
`A50`	Andrushivka Obs. in the Ukraine, 1 in MPEC 2007-U70 -- 2003 AE23
`J51`	Atlante Obs. in the Canary Islands, 3 in MPEC 2007-U70 -- 2007 PU11, 2002 RC118, 2212
`F84`	Hibiscus Obs. in Tahiti, 1 in MPEC 2007-U70 -- 2007 UV3
`A35`	Hormersdorf Obs. in Germany, 1 in MPEC 2007-U70 -- 2007 LR32
`704`	LINEAR in New Mexico, 2 in MPEC 2007-U70 -- 2007 TV24, 2007 PU11
`B33`	Libbiano Obs. in Italy, 1 in MPEC 2007-U70 -- 2007 UD6
`D21`	Shenton Park Obs. in Western Australia, 5 in MPEC 2007-U70 -- 2007 UT3, 2007 UT, 2007 UF6, 2007 TS19, 2007 TC66
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2007-U70 -- 2003 AE23, 2002 RC118, 52768, 3757
`291`	Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2007-U70 -- 2007 UD6, 2007 TB23

Impact Risk Monitoring on 24 October '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2356 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 UO6	NEODyS	1301	2031-2085	13	1.51e-05	-5.77	-6.23	0	NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2007/10/21.365 to 2007/10/23.364."

2007 UD6	NEODyS	1301	2058-2089	52	1.19e-04	-5.84	-6.15	0	NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2007/10/20.296 to 2007/10/23.292."
2007 UD6	JPL Sentry	1300	2058-2102	51	1.2e-04	-5.84	-6.16	0	JPL: "Analysis based on 44 observations spanning 2.9959 days (2007-Oct-20.29569 to 2007-Oct-23.29163)." Diameter approximately 0.007 km. from mean, weighted H=28.4.

2007 UT3	NEODyS	1703	2068-2078	5	7.29e-07	-6.70	-6.95	0	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2007/10/19.300 to 2007/10/23.668."
2007 UT3	JPL Sentry	1300	2062-2078	5	7.0e-07	-6.73	-6.96	0	JPL: "Analysis based on 18 observations spanning 4.3683 days (2007-Oct-19.2989 to 2007-Oct-23.66722)." Diameter approximately 0.024 km. from mean, weighted H=25.7.

2007 TB23	JPL Sentry	1300	R E M O V E D						JPL: Risk listing removed at 1157 UTC.

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 24 October '07

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

1703	Noted that NEODyS has updated its 2007 UT3 risk assessment - see above
1301	Noted that NEODyS has updated its 2007 UD6 risk assessment - see above
1300	Noted that JPL Sentry has removed 2007 TB23 as an impact risk - see above Noted that JPL Sentry has updated its 2007 UD6 risk assessment - see above Noted that NEODyS has posted 2007 UO6 as an impact risk - see above Noted that JPL Sentry has updated its 2007 UT3 risk assessment - see above Grabbed MPEC 2007-U70 - Daily Orbit Update - see above

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