2008-12-11 Tracking News

Contents on 11 December '08

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- seven MPECs
Observers -- nine 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 A/CC news is available via framed access, 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.

Radar Astrometry on 11 December '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data addition noted at 2118 UTC when the database was dated 11 Dec.

4179 Toutatis (1989 AC) from Arecibo (Nov. 23.46 range, 1992 Dec. 17.33 range & 18.33 range) and Goldstone DSS-14 70m antenna transmit with Goldstone DSS-13 34m antenna receive (1996 Nov. 25.83 velocity, 26.75 velocity, 27.74 velocity, 28.73 velocity, 29.65 velocity, 30.61 velocity, 1996 Dec. 1.56 velocity, 2.55 velocity & 3.51 velocity)

NEOCP Activity on 11 December '08

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2358 UTC). It was last noted active on December 9th.

New MPECs on 11 December '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been seven MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-X72 time-stamped "07:08 UT" - Daily Orbit Update - see below
MPEC 2008-X73 time-stamped "20:05 UT" - Observable Comets - see below
MPEC 2008-X74 time-stamped "20:11 UT" - Distant Minor Planets - see below
MPEC 2008-X75 time-stamped "20:14 UT" - Atens and Apollos - see below
MPEC 2008-X76 time-stamped "20:14 UT" - Amors - see below
MPEC 2008-X77 time-stamped "20:14 UT" - Unusual Minor Planets - see below
MPEC 2008-X78 time-stamped "20:14 UT" - PHAs

MPEC 2008-X78 - "20:14 UT" - PHAs

MPEC 2008-X77 - "20:14 UT" - Unusual Minor Planets

MPEC 2008-X76 - "20:14 UT" - Amors

MPEC 2008-X75 - "20:14 UT" - Atens and Apollos

MPEC 2008-X74 - "20:11 UT" - Distant Minor Planets

MPEC 2008-X73 - "20:05 UT" - Observable Comets

<< DOU on 11 Dec. '08 >> MPEC 2008-X72 - "07:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08X01C 2008 XC1 (small asteroid, arc=7 days, H=23.6 ~65m) from Schiaparelli Obs. (Dec. 4.05-06p3) and Faulkes Telescope South (Dec. 9.63-68p9)
K08W94Y 2008 WY94 (small asteroid, arc=7 days, H=25.6 ~26m) from Schiaparelli Obs. (Dec. 3.74p1 & 3.79p1)
Observations of recently (no longer) risk-listed objects
K08W63Q 2008 WQ63 (arc=18 days, H=20.0 ~339m) from Desert Moon Obs. (Dec. 10.32-33p3)
K08W14D 2008 WD14 (small asteroid, arc=19 days, H=22.8 ~93m) from the Siding Spring Survey (SSS) (Dec. 10.58-59p2)
Observations of small asteroids (H>22.0)
K08W14G 2008 WG14 (arc=16 days, H=24.8 ~37m) from Schiaparelli Obs. (Dec. 4.04-05p5)
Observations of other objects
K08X00M 2008 XM (q=0.110 AU, arc=3 days, H=19.8 ~371m) from Schiaparelli Obs. (Dec. 3.84-85p2 & 3.90p1)
K08W60L 2008 WL60 (arc=17 days, H=18.1 ~812m) from LINEAR (Dec. 10.26-32p5)
K08V04U 2008 VU4 (Q=4.211 AU, arc=32 days, H=17.6 ~1.02 km) from Schiaparelli Obs. (Dec. 4.07-08p2 & 4.15p2)
K08U94Z 2008 UZ94 (arc=40 days, H=17.7 ~977m) from Schiaparelli Obs. (Dec. 3.75p2 & 3.80-81p2)
K08U07E 2008 UE7 (arc=45 days, H=20.4 ~282m) from Hamamatsu-Yuto Obs. (Dec. 10.75-79p7)
K08U00C 2008 UC (arc=52 days, H=18.9 ~562m) from Desert Moon Obs. (Dec. 10.16-17p2)
K08S82H 2008 SH82 (arc=75 days, H=21.1 ~204m) from Desert Moon Obs. (Dec. 10.12-14p3)
K08E05V 2008 EV5 (arc=2 opp, H=20.0 ~339m) from SSS (Dec. 10.65-66p2)
K06V14B 2006 VB14 (arc=2 opp, H=18.6 ~645m) from Hamamatsu-Yuto Obs. (Dec. 10.64-66p4)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from LINEAR (Dec. 10.20-25p5)
K05W01D 2005 WD1 (i=43.1°, arc=3 opp, H=16.7 ~1.55 km) from Schiaparelli Obs. (Dec. 3.83-84p2 & 3.88-89p2)
68350 68350 2001 MK3 from LINEAR (Dec. 10.40-44p4)
08035 8035 1992 TB from SSS (Dec. 10.61-64p4)

Observers on 11 December '08

Nine observing facilities appear in today's MPEC.

Code	Observer / observatory
`251`	Arecibo in Puerto Rico, 1 in radar -- 4179
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2008-X72 -- 2008 WQ63, 2008 UC, 2008 SH82
`E10`	Faulkes Telescope South in New South Wales, 1 in MPEC 2008-X72 -- 2008 XC1
`252`	Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 4179
`253`	Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4179
`379`	Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-X72 -- 2008 UE7, 2006 VB14
`704`	LINEAR in New Mexico, 3 in MPEC 2008-X72 -- 2008 WL60, 2006 SZ217, 68350
`204`	Schiaparelli Obs. in Italy, 7 in MPEC 2008-X72 -- 2008 XM, 2008 XC1, 2008 WY94, 2008 WG14, 2008 VU4, 2008 UZ94, 2005 WD1
`E12`	Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2008-X72 -- 2008 WD14, 2008 EV5, 8035

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 11 December '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2358 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.
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

2008 XC1	JPL Sentry	1403	2085-2088	2	3.6e-07	-5.97	-6.06	0	JPL: "Analysis based on 108 observations spanning 6.6124 days (2008-Dec-03.36799 to 2008-Dec-09.98036)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
2008 XC1	NEODyS	1403	2085-2088	2	3.85e-07	-5.93	-6.03	0	NEODyS: "Based on 109 optical observations (of which 1 are rejected as outliers) from 2008/12/03.369 to 2008/12/09.981."

2008 WY94	JPL Sentry	1403	2061-2076	17	2.5e-04	-4.20	-4.25	0	JPL: "Analysis based on 32 observations spanning 7.2084 days (2008-Nov-29.54021 to 2008-Dec-06.748633)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2008 WY94	NEODyS	1403	2061-2089	51	1.68e-04	-4.37	-4.47	0	NEODyS: "Based on 34 optical observations (of which 3 are rejected as outliers) from 2008/11/29.541 to 2008/12/06.749."

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 11 December '08

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

2118	Grabbed MPEC 2008-X73 - Observable Comets - see above Grabbed MPEC 2008-X74 - Distant Minor Planets - see above Grabbed MPEC 2008-X75 - Atens and Apollos - see above Grabbed MPEC 2008-X76 - Amors - see above Grabbed MPEC 2008-X77 - Unusual Minor Planets - see above Grabbed MPEC 2008-X78 - PHAs - see above Noted Radar Astrometry database addition - see above
1403	Noted that JPL Sentry has updated its 2008 WY94 risk assessment - see above Noted that NEODyS has updated its 2008 WY94 risk assessment - see above Noted that JPL Sentry has updated its 2008 XC1 risk assessment - see above Noted that NEODyS has updated its 2008 XC1 risk assessment - see above Grabbed MPEC 2008-X72 - Daily Orbit Update - see above

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