Contents  on 23 November '11

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 23 November '11

Radar observation of two objects

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


Data update noted at 0100 UTC when the database was dated 22 Nov.


Data update noted at 2312 UTC when the database was dated 23 Nov.



Photometry is needed for upcoming radar targets and also some astrometry. See Arecibo and Goldstone schedules.

NEOCP Activity  on 23 November '11

The MPC's NEO Confirmation Page has 11 listings

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

New MPECs  on 23 November '11

Minor Planet Electronic Circulars

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


MPEC 2011-W41 - "18:38 UT" - 2011 WN15


MPEC 2011-W40 - "18:36 UT" - 2011 WL15


MPEC 2011-W39 - "18:34 UT" - 2011 WJ15


MPEC 2011-W38 - "18:32 UT" - 2011 WH15


<< DOU on 23 Nov. '11 >>  MPEC 2011-W37 - "06:05 UT" - Daily Orbit Update

Observers  on 23 November '11

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 2005 YU55, 138524
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-W37 -- 2011 GA55
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-W41 -- 2011 WN15
160Castelmartini Obs. in Italy, 4 in MPEC 2011-W37 -- 302831, 297418, 208617, 7341
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2011-W37, 2011-W39 & 2011-W41 -- 2011 WN15, 2011 WJ15, 2011 UU158, 2011 TN9, 2006 VY13, 66407, 42286, 275714, 142348, 141498, 136923, 6050, 3352
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 19 in MPECs 2011-W37, 2011-W40 & 2011-W41 -- 2011 WV2, 2011 WR2, 2011 WQ4, 2011 WP4, 2011 WO4, 2011 WN2, 2011 WN15, 2011 WM2, 2011 WL2, 2011 WL15, 2011 WD, 2011 WC, 2011 VP12, 2011 UY255, 2011 SZ15, 2010 LJ14, 2006 VY13, 2006 SL198, 2006 MJ10
C81Dolomites Obs. in Italy, 1 in MPEC 2011-W39 -- 2011 WJ15
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-W39 -- 2011 WJ15
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2005 YU55
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2005 YU55
J95Great Shefford Obs. in England, 5 in MPECs 2011-W37, 2011-W39 & 2011-W41 -- 2011 WQ4, 2011 WP4, 2011 WN15, 2011 WJ15, 2011 VU5
A17Guidestar Obs. in Germany, 8 in MPEC 2011-W37 -- 2011 WW4, 2011 WV4, 2011 WV2, 2011 WP4, 2011 WM2, 2011 VW5, 2011 UZ275, 2006 WO3
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-W37 -- 2011 NY
246KLENOT in the Czech Republic, 2 in MPEC 2011-W37 -- 2011 VP12, 54071
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2011-W37 -- 2011 WA
704LINEAR in New Mexico, 13 in MPEC 2011-W37 -- 2011 SR69, 2011 GH3, 2004 QJ7, 90075, 37336, 305090, 208617, 142348, 141498, 138852, 3988, 3352, 2201
844Los Molinos Obs. in Uruguay, 1 in MPEC 2011-W37 -- 87684
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-W38, 2011-W39, 2011-W40 & 2011-W41 -- 2011 WN15, 2011 WL15, 2011 WJ15, 2011 WH15
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-W37 & 2011-W38 -- 2011 WH15, 304640, 2368
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2011-W37 & 2011-W40 -- 2011 WL15, 2011 UG256, 2011 TN9, 2001 UE5, 85713, 54071, 303174, 302591, 277475, 162273, 2212, 1943
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-W37 -- 26760
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-W39 -- 2011 WJ15
J41Raheny Obs. in Ireland, 1 in MPEC 2011-W39 -- 2011 WJ15
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2011-W39 & 2011-W41 -- 2011 WN15, 2011 WJ15
204Schiaparelli Obs. in Italy, 4 in MPECs 2011-W37, 2011-W39, 2011-W40 & 2011-W41 -- 2011 WP4, 2011 WN15, 2011 WL15, 2011 WJ15
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-W37 -- 4486
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2011-W37 & 2011-W38 -- 2011 WS2, 2011 WH15, 2011 VQ5, 2011 VO5, 2011 VG9, 2011 VB, 2011 UX114, 2011 UE305, 2011 SG16, 2001 YE4
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-W39 -- 2011 WJ15
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 November '11

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. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 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
2011 WL15JPL Sentry21162033-2111386.8e-08-4.66-5.220JPL: "Analysis based on 14 observations spanning .91245 days (2011-Nov-22.38481 to 2011-Nov-23.29726)." Diameter approximately 0.360 km. from mean, weighted H=19.9.
2011 WQ4JPL Sentry1702204812.0e-07-7.83-7.830JPL: "Analysis based on 55 observations spanning 4.9036 days (2011-Nov-18.27488 to 2011-Nov-23.17845)." Diameter approximately 0.011 km. from mean, weighted H=27.4.
NEODyS17022088-208812.81e-09-10.01-10.010NEODyS: "Based on 55 optical observations (of which 1 are rejected as outliers) from 2011-11-18.276 to 2011-11-23.179."
2011 WL2JPL Sentry17022060-207141.4e-07-4.89-5.250JPL: "Analysis based on 84 observations spanning 5.8799 days (2011-Nov-16.31883 to 2011-Nov-22.19871)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS17022060-2090152.33e-07-4.69-5.340NEODyS: "Based on 84 optical observations (of which 0 are rejected as outliers) from 2011-11-16.320 to 2011-11-22.199."
2011 VG9JPL Sentry17022085-210494.7e-06-3.83-4.140JPL: "Analysis based on 40 observations spanning 7.0655 days (2011-Nov-15.37847 to 2011-Nov-22.444)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
NEODyS17022085-208633.68e-06-3.92-4.170NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2011-11-15.379 to 2011-11-22.445."
2011 UE305JPL Sentry1702210922.0e-06-4.16-4.190JPL: "Analysis based on 26 observations spanning 23.008 days (2011-Oct-30.46441 to 2011-Nov-22.47273)." Diameter approximately 0.170 km. from mean, weighted H=21.4.

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 23 November '11

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

2312Noted Radar Astrometry database update - see above
2116Noted that JPL Sentry has posted 2011 WL15 as an impact risk - see above
1851Grabbed MPEC 2011-W38 - 2011 WH15 - see above
Grabbed MPEC 2011-W39 - 2011 WJ15 - see above
Grabbed MPEC 2011-W40 - 2011 WL15 - see above
Grabbed MPEC 2011-W41 - 2011 WN15 - see above
1702Noted that JPL Sentry has updated its 2011 UE305 risk assessment - see above
Noted that JPL Sentry has updated its 2011 VG9 risk assessment - see above
Noted that NEODyS has updated its 2011 VG9 risk assessment - see above
Noted that JPL Sentry has updated its 2011 WL2 risk assessment - see above
Noted that NEODyS has updated its 2011 WL2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 WQ4 risk assessment - see above
Noted that NEODyS has updated its 2011 WQ4 risk assessment - see above
Grabbed MPEC 2011-W37 - Daily Orbit Update - see above
0100Noted Radar Astrometry database update - see above