2009-12-30 Tracking News

Contents on 30 December '09

IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- three MPECs
Observers -- six 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
News image catalog
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.

NEOCP Activity on 30 December '09

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 27th.

New MPECs on 30 December '09

Minor Planet Electronic Circulars

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

MPEC 2009-Y61 time-stamped "07:11 UT" - Daily Orbit Update - see below
MPEC 2009-Y62 time-stamped "16:42 UT" - 2007 GW5 - see below
MPEC 2009-Y63 time-stamped "23:02 UT" - 2008 YZ32

MPEC 2009-Y63 - "23:02 UT" - 2008 YZ32

K08Y32Z 2008 YZ32 (H=20.2 ~309m) from Andrew Lowe via RAS Obs. Moorook (Dec. 29.71p2 & 30.72-73p5)

MPEC 2009-Y62 - "16:42 UT" - 2007 GW5

K07G05W 2007 GW5 (H=21.6 ~162m) from David Tholen's team on Mauna Kea (Dec. 9.51-52p2 at R=23.4 & 19.54-55p3 at R=23.3-6)

<< DOU on 30 Dec. '09 >> MPEC 2009-Y61 - "07:11 UT" - Daily Orbit Update

Observations of risk-listed objects
K09X00O 2009 XO (arc=20 days, H=20.2 ~309m) from McCarthy Obs. (Dec. 29.29p3)
Observations of recently (no longer) risk-listed objects
K09X06T 2009 XT6 (arc=16 days, H=20.2 ~309m) from Astronomical Research Obs. Westfield (ARO Westfield) (Dec. 29.26p3)
K09X02C 2009 XC2 (Q=4.190 AU, arc=18 days, H=17.0 ~1.35 km) from ARO Westfield (Dec. 29.42-43p3)
Observations of small asteroids (H>22.0)
K09X08K 2009 XK8 (arc=6 days, H=25.1 ~32m) from Schiaparelli Obs. (Dec. 18.02-03p2)
Observations of other objects
K09X02R 2009 XR2 (arc=16 days, H=19.1 ~513m) from ARO Westfield (Dec. 29.26-27p5)
K09WA4Z 2009 WZ104 (arc=35 days, H=20.5 ~269m) from McCarthy Obs. (Dec. 30.16p2)
K09W06R 2009 WR6 (arc=41 days, H=18.3 ~741m) from ARO Westfield (Dec. 29.35-37p3)
K07U03R 2007 UR3 (arc=3 opp, H=21.1 ~204m) from ARO Westfield (Dec. 29.30p3)
K07H00Z 2007 HZ (arc=3 opp, H=20.2 ~309m) from ARO Westfield (Dec. 29.31-32p4)
K06U00R 2006 UR (arc=2 opp, H=19.4 ~446m) from ARO Westfield (Dec. 29.33-34p5)
K06B06N 2006 BN6 (Q=4.352 AU, arc=4 opp, H=17.4 ~1.12 km) from ARO Westfield (Dec. 29.32-33p4)
K04X50D 2004 XD50 (arc=2 opp, H=18.5 ~676m) from Schiaparelli Obs. (Dec. 18.06-08p3)
K02VB8D 2002 VD118 (arc=3 opp, H=20.1 ~323m) from ARO Westfield (Dec. 29.48-49p3 at V=21.8-22.3)
K02L00V 2002 LV (arc=3 opp, H=16.6 ~1.62 km) from ARO Westfield (Dec. 29.28-29p5)
54789 54789 2001 MZ7 from AAAA Buenos Aires Obs. (Dec. 22.12-21p4)

Observers on 30 December '09

Six observing facilities appear in today's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2009-Y61 -- 54789
`H21`	Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 10 in MPEC 2009-Y61 -- 2009 XT6, 2009 XR2, 2009 XC2, 2009 WR6, 2007 UR3, 2007 HZ, 2006 UR, 2006 BN6, 2002 VD118, 2002 LV
`5682`	David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-Y62 -- 2007 GW5
`932`	McCarthy Obs. in Connecticut, 2 in MPEC 2009-Y61 -- 2009 XO, 2009 WZ104
`D906`	Andrew Lowe via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-Y63 -- 2008 YZ32
`204`	Schiaparelli Obs. in Italy, 2 in MPEC 2009-Y61 -- 2009 XK8, 2004 XD50

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

Impact Risk Monitoring on 30 December '09

**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.
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 XO	JPL Sentry	1558	2038-2045	2	2.7e-07	-4.07	-4.35	0	JPL: "Analysis based on 117 observations spanning 20.140 days (2009-Dec-09.152 to 2009-Dec-29.29219)." Diameter approximately 0.300 km. from mean, weighted H=20.2.
2009 XO	NEODyS	1558	2045	1	1.57e-07	-4.35	-4.35	0	NEODyS: "Based on 117 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/29.293."

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 30 December '09

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

2358	Grabbed MPEC 2009-Y63 - 2008 YZ32 - see above
1837	Grabbed MPEC 2009-Y62 - 2007 GW5 - see above
1558	Noted that JPL Sentry has updated its 2009 XO risk assessment - see above Noted that NEODyS has updated its 2009 XO risk assessment - see above Grabbed MPEC 2009-Y61 - Daily Orbit Update - see above

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