Contents  on 11 December '09

Resources:

The latest A/CC news is available via framed access, RSS news feed 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 11 December '09

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of fourteen listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 11 December '09

Minor Planet Electronic Circulars

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


MPEC 2009-X39 - "23:02 UT" - 2009 XV1


MPEC 2009-X38 - "22:08 UT" - Thirteen Sungrazing Comets


MPEC 2009-X37 - "21:48 UT" - Eleven Sungrazing Comets


MPEC 2009-X36 - "18:40 UT" - 2009 XR1


MPEC 2009-X35 - "18:12 UT" - 2009 XQ1


<< DOU on 11 Dec. '09 >>  MPEC 2009-X34 - "07:09 UT" - Daily Orbit Update

Observers  on 11 December '09

A total of 25 observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2009-X35 -- 2009 XQ1
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2009-X34 -- 2009 NA
160Castelmartini Obs. in Italy, 9 in MPEC 2009-X34 -- 2009 WX51, 2009 WD11, 36284, 162998, 143947, 5626, 4015, 3552, 433
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2009-X34 -- 2009 JL1, 2002 WP, 226554
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2009-X34 -- 217683, 20790
J27El Guijo Obs. in Spain, 1 in MPEC 2009-X34 -- 2002 WP
808El Leoncito Obs. in Argentina, 8 in MPEC 2009-X34 -- 2002 WP, 86326, 85818, 54660, 218863, 217796, 177614, 162181
J95Great Shefford Obs. in England, 4 in MPECs 2009-X34 & 2009-X35 -- 2009 XQ1, 2009 XO, 2009 XD, 2009 WZ104
704LINEAR in New Mexico, 6 in MPEC 2009-X34 -- 2009 WZ104, 2009 MX6, 2007 BG29, 207945, 137805, 3200
J75La Sagra Obs. in Spain, 4 in MPEC 2009-X34 -- 2009 XO, 99248, 152560, 5131
J38La Vara Obs. in Spain, 1 in MPEC 2009-X34 -- 4015
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-X34 -- 96744
568[Ovidiu Vaduvescu on Mauna Kea in Hawaii, 1 in MPEC 2009-X34 -- 2005 YD
900Moriyama Obs. in Japan, 1 in MPEC 2009-X34 -- 2009 XD
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2009-X34, 2009-X35, 2009-X36 & 2009-X39 -- 2009 XV1, 2009 XR1, 2009 XQ1, 2009 UM3
A13Naef Obs. in Switzerland, 1 in MPEC 2009-X34 -- 2009 KN4
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2009-X34 -- 2009 XD, 2009 WX51, 2009 WL1, 2009 WF, 2009 RN, 2009 NA, 2006 UR, 2002 XN14, 2002 WP
H28Preston Hills Obs. in Texas, 1 in MPEC 2009-X34 -- 2009 XD
J41Raheny Obs. in Ireland, 1 in MPEC 2009-X39 -- 2009 XV1
C494HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 11 in MPECs 2009-X37 & 2009-X38 -- C/2008 Y7, C/2008 Y6, C/2008 Y15, C/2008 Y13, C/2008 Y10, C/2008 X12, C/2008 X11, C/2007 F3, C/2007 C6, C/2007 C3, C/2007 C13
C495COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 14 in MPECs 2009-X37 & 2009-X38 -- C/2008 R10, C/2008 P3, C/2008 N8, C/2008 N2, C/2008 K4, C/2008 B2, C/2007 Y5, C/2007 X10, C/2007 V4, C/2007 V11, C/2007 S5, C/2007 N7, C/2007 M4, C/2007 F3
C505COR2-B instrument (5) aboard STEREO-B in heliocentric orbit trailing Earth, 10 in MPECs 2009-X37 & 2009-X38 -- C/2008 R10, C/2008 P3, C/2008 N2, C/2008 K4, C/2008 B2, C/2007 X10, C/2007 V4, C/2007 V11, C/2007 S5, C/2007 M4
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-X35 -- 2009 XQ1
926Tenagra II Obs. in Arizona, 7 in MPECs 2009-X34, 2009-X35, 2009-X36 & 2009-X39 -- 2009 XV1, 2009 XR1, 2009 XQ1, 2009 WZ7, 2009 WR6, 2009 WF104, 2009 WD106
H53Thompsonville Obs. in Illinois, 11 in MPEC 2009-X34 -- 2009 WZ104, 2005 TY51, 2002 XN14, 2002 WP, 96590, 86326, 217807, 143947, 5626, 3552, 433
A48Verona Obs. in Italy, 8 in MPEC 2009-X34 -- 2009 XD, 2009 WX51, 2009 WL1, 2009 WF, 2009 WD11, 2009 WD106, 2006 UR, 2006 KZ37
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2009-X34 -- 3552
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 XR1JPL Sentry21202026-205661.2e-07-8.88-9.500JPL: "Analysis based on 15 observations spanning .22732 days (2009-Dec-11.14638 to 2009-Dec-11.3737)." Diameter approximately 0.005 km. from mean, weighted H=29.3.
2009 XOJPL Sentry15402036-210694.0e-09-6.01-6.390JPL: "Analysis based on 55 observations spanning 1.8693 days (2009-Dec-09.152 to 2009-Dec-11.02125)." Diameter approximately 0.346 km. from mean, weighted H=19.9.
NEODyS15402026-208356.62e-10-6.40-6.580NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/11.022."
2005 TM173JPL Sentry06042010-21061679.8e-07-5.44-6.370JPL: "Analysis based on 6 observations spanning 1.9467 days (2005-Oct-09.20072 to 2005-Oct-11.14743)." Diameter approximately 0.051 km. from mean, weighted H=24.1.

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 '09

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

2358Grabbed MPEC 2009-X39 - 2009 XV1 - see above
2300Grabbed MPEC 2009-X37 - Eleven Sungrazing Comets - see above
Grabbed MPEC 2009-X38 - Thirteen Sungrazing Comets - see above
2120Noted that JPL Sentry has posted 2009 XR1 as an impact risk - see above
1900Grabbed MPEC 2009-X35 - 2009 XQ1 - see above
Grabbed MPEC 2009-X36 - 2009 XR1 - see above
1540Noted 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-X34 - Daily Orbit Update - see above
0604Noted that JPL Sentry has updated its 2005 TM173 risk assessment - see above