2009-02-13 Tracking News

Contents on 13 February '09

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- two MPECs
Observers -- fifteen observing facilities
Impact Risk Monitoring -- one object
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 13 February '09

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 update noted at 2136 UTC when the database was dated 13 Feb.

1999 AQ10 from Goldstone DSS-14 70m antenna (Feb. 10.30 range & 13.41 range) and Arecibo (Feb. 12.27 range) - see links

NEOCP Activity on 13 February '09

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2258 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of two objects listed on the NEOCP at some point today.

New MPECs on 13 February '09

Minor Planet Electronic Circulars

As of last check at 2258 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-C81 time-stamped "07:05 UT" - Daily Orbit Update - see below
MPEC 2009-C82 time-stamped "19:38 UT" - 2009 CR4

MPEC 2009-C82 - "19:38 UT" - 2009 CR4

K09C04R 2009 CR4 (risk-listed, H=21.7 ~155m) was discovered at 0244 UT on 13 Feb. by the Spacewatch 0.9m telescope, which observed it at Feb. 13.11-15p3. The discovery was confirmed by Calar Alto Obs. (Feb. 13.18p3 & 13.79-80p3) and Sabino Canyon Obs. (Feb. 13.32-33p3).

<< DOU on 13 Feb. '09 >> MPEC 2009-C81 - "07:05 UT" - Daily Orbit Update

Observations of recently (no longer) risk-listed objects
K09C00V 2009 CV (small asteroid, arc=10 days, H=24.2 ~49m) from Wildberg Obs. (Feb. 12.82-83p3) and El Guijo Obs. (Feb. 12.94-96p3)
Observations of other objects
K09A16D 2009 AD16 (Q=4.182 AU, arc=27 days, H=20.6 ~257m) from the Siding Spring Survey (SSS) (Feb. 11.56-57p2)
K08Q03T 2008 QT3 (arc=171 days, H=18.8 ~589m) from Rio Cuarto Obs. (Feb. 12.09-10p2)
K08E05E 2008 EE5 (i=44.8°, arc=2 opp, H=19.5 ~426m) from Hamamatsu-Yuto Obs. (Feb. 10.53-55p5 & 12.49-52p7), Siegen Obs. (Feb. 12.86p2), and Betelgeuse Station (Feb. 12.87p1)
K7398 207398 2006 AS2 from Spacewatch 0.9m (Jan. 29.10-13p3), Hamamatsu-Yuto Obs. (Feb. 6.58-59p3 & 10.49-50p4), and Cegep de Trois-Rivieres Obs. (Feb. 7.05p20)
K6910 206910 2004 NL8 from Hamamatsu-Yuto Obs. (Feb. 10.73-75p7)
22753 22753 1998 WT from Iluro Obs. (Feb. 10.99p3)
04179 4179 Toutatis (1989 AC) from Iluro Obs. (Feb. 10.97p3) and Capannoli Obs. (Feb. 12.78-79p2)

Observers on 13 February '09

Fifteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`251`	Arecibo in Puerto Rico, 1 in radar -- 1999 AQ10
`B75`	Betelgeuse Station in Italy, 1 in MPEC 2009-C81 -- 2008 EE5
`493`	Calar Alto Obs. in Spain, 1 in MPEC 2009-C82 -- 2009 CR4
`B09`	Capannoli Obs. in Italy, 1 in MPEC 2009-C81 -- 4179
`924`	Cegep de Trois-Rivieres Obs. in Quebec, 1 in MPEC 2009-C81 -- 207398
`J27`	El Guijo Obs. in Spain, 1 in MPEC 2009-C81 -- 2009 CV
`253`	Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 1999 AQ10
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2009-C81 -- 2008 EE5, 207398, 206910
`B19`	Iluro Obs. in Spain, 2 in MPEC 2009-C81 -- 22753, 4179
`I20`	Rio Cuarto Obs. in Argentina, 1 in MPEC 2009-C81 -- 2008 QT3
`854`	Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-C82 -- 2009 CR4
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2009-C81 -- 2009 AD16
`510`	Siegen Obs. in Germany, 1 in MPEC 2009-C81 -- 2008 EE5
`691`	Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2009-C81 & 2009-C82 -- 2009 CR4, 207398
`198`	Wildberg Obs. in Germany, 1 in MPEC 2009-C81 -- 2009 CV

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

Impact Risk Monitoring on 13 February '09

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2258 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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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

2009 CR4	JPL Sentry	2155	2061	1	1.1e-10	-8.42	-8.42	0	JPL: "Analysis based on 12 observations spanning .68389 days (2009-Feb-13.1142 to 2009-Feb-13.79809)." Diameter approximately 0.150 km. from mean, weighted H=21.8.

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 13 February '09

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

2155	Noted that JPL Sentry has posted 2009 CR4 as an impact risk - see above
2136	Noted that the NEOCP has become active Noted Radar Astrometry database update - see above
1958	Grabbed MPEC 2009-C82 - 2009 CR4 - see above Noted that the NEOCP has become empty
1507	Grabbed MPEC 2009-C81 - Daily Orbit Update - see above
0500	Noted that the NEOCP has become active

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