Contents  on 21 October '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.

Radar Astrometry  on 21 October '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 1948 UTC when the database was dated 21 Oct.

NEOCP Activity  on 21 October '09

The MPC's NEO Confirmation Page has 4 listings: 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. All of these were "one nighters." So far The Tracking News has counted a total of eleven listings on the NEOCP at some point today.

New MPECs  on 21 October '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-U61 - "19:10 UT" - 2009 TD17


MPEC 2009-U60 - "17:08 UT" - 2009 UR5


MPEC 2009-U59 - "17:03 UT" - 2009 UQ5


MPEC 2009-U58 - "16:59 UT" - 2009 UP5


MPEC 2009-U57 - "12:53 UT" - 2009 UJ5


<< DOU on 21 Oct. '09 >>  MPEC 2009-U56 - "06:12 UT" - Daily Orbit Update


MPEC 2009-U55 - "03:19 UT" - 2009 KN4

Observers  on 21 October '09

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

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPEC 2009-U56 -- 2009 UP1, 2009 UO3
251Arecibo in Puerto Rico, 1 in radar -- 159402
H55Astronomical Research Obs. (ARO) in Illinois, 2 in MPECs 2009-U57 & 2009-U58 -- 2009 UP5, 2009 UJ5
300Bisei Spaceguard Center in Japan, 1 in MPEC 2009-U58 -- 2009 UP5
215Buchloe Obs. in Germany, 2 in MPEC 2009-U56 -- 2009 UG, 2009 TK8
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2009-U56 & 2009-U61 -- 2009 TD17, 2009 QH2, 220909, 20790
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2009-U56 -- 2009 SV171
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 3 in MPECs 2009-U58, 2009-U59 & 2009-U60 -- 2009 UR5, 2009 UQ5, 2009 UP5
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-U56 -- 217807
A17Guidestar Obs. in Germany, 1 in MPEC 2009-U56 -- 2009 TK12
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2009-U56 -- 2009 TK8, 2009 ST19, 2009 SM103, 2009 RN, 2009 KC3, 2005 RQ6
B19Iluro Obs. in Spain, 1 in MPEC 2009-U56 -- 2005 RQ6
G92Jarnac Obs. in Arizona, 1 in MPEC 2009-U56 -- 2009 TM10
704LINEAR in New Mexico, 20 in MPECs 2009-U56, 2009-U57 & 2009-U58 -- 2009 UW2, 2009 UP5, 2009 UM3, 2009 UJ5, 2009 TM10, 2009 TA1, 2009 RB4, 2009 OC, 2002 TN30, 2002 FB6, 1993 RA, 99907, 87311, 38091, 217683, 216689, 20826, 16816, 143487, 5131
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2009-U56 -- 2009 TO8
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-U56 -- 2006 OY10
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2009-U59 & 2009-U60 -- 2009 UR5, 2009 UQ5
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2009-U55 -- 2009 KN4
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2009-U56 -- 2009 TK8, 2009 SV171, 2009 ST19, 2009 SM103, 2009 SF2, 2009 RN, 2009 HV44, 1999 HY1
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-U57 -- 2009 UJ5
D21Shenton Park Obs. in Western Australia, 6 in MPEC 2009-U56 -- 2009 UU1, 2009 UM3, 2009 UD, 2009 TN8, 2009 KL2, 2005 SG19
E12Siding Spring Survey (SSS) in New South Wales, 13 in MPECs 2009-U56 & 2009-U61 -- 2009 UU1, 2009 UN3, 2009 TK, 2009 TD17, 2009 OB3, 2009 KL2, 2009 HD21, 2005 WK4, 2005 SA71, 2001 HZ7, 27346, 10563, 5626
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2009-U56 -- 2009 UF2, 2009 TQ8, 2009 SB170
926Tenagra II Obs. in Arizona, 2 in MPECs 2009-U57 & 2009-U59 -- 2009 UQ5, 2009 UJ5
C00Velikie Luki Obs. in Russia, 3 in MPEC 2009-U56 -- 2009 ST19, 2009 ML1, 35396
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 October '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 UN3JPL Sentry13222017-2090234.8e-09-4.19-4.410JPL: "Analysis based on 11 observations spanning 1.1593 days (2009-Oct-19.59856 to 2009-Oct-20.75788)." Diameter approximately 0.965 km. from mean, weighted H=17.7.
NEODyS13222014-2090599.94e-09-3.86-4.570NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2009/10/19.599 to 2009/10/20.759."
2009 UF2JPL Sentry13222037-206831.3e-08-7.48-7.540JPL: "Analysis based on 12 observations spanning 1.9453 days (2009-Oct-18.22265 to 2009-Oct-20.16798)." Diameter approximately 0.046 km. from mean, weighted H=24.3.
NEODyS13222037-205221.08e-08-7.69-7.730NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2009/10/18.223 to 2009/10/20.169."
2009 TD17JPL Sentry21302039-2096518.9e-05-5.31-5.360JPL: "Analysis based on 19 observations spanning 2.0022 days (2009-Oct-09.32683 to 2009-Oct-11.329)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
2009 TG10JPL Sentry03272039-210135.0e-10-5.24-5.510JPL: "Analysis based on 24 observations spanning 1.1015 days (2009-Oct-15.31786 to 2009-Oct-16.41933)." Diameter approximately 1.000 km. from mean, weighted H=17.6.

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 21 October '09

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

2130Noted that JPL Sentry has posted 2009 TD17 as an impact risk - see above
1948Grabbed MPEC 2009-U61 - 2009 TD17 - see above
Noted Radar Astrometry database update - see above
1740Grabbed MPEC 2009-U58 - 2009 UP5 - see above
Grabbed MPEC 2009-U59 - 2009 UQ5 - see above
Grabbed MPEC 2009-U60 - 2009 UR5 - see above
1322Noted that JPL Sentry has updated its 2009 UF2 risk assessment - see above
Noted that NEODyS has updated its 2009 UF2 risk assessment - see above
Noted that JPL Sentry has updated its 2009 UN3 risk assessment - see above
Noted that NEODyS has posted 2009 UN3 as an impact risk - see above
Grabbed MPEC 2009-U56 - Daily Orbit Update - see above
Grabbed MPEC 2009-U57 - 2009 UJ5 - see above
0327Noted that JPL Sentry has posted 2009 TG10 as an impact risk - see above
Grabbed MPEC 2009-U55 - 2009 KN4 - see above