Contents  on 24 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.

NEOCP Activity  on 24 November '11

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 43 listings on the NEOCP 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 24 November '11

Minor Planet Electronic Circulars

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


<< DOU on 24 Nov. '11 >>  MPEC 2011-W43 - "06:05 UT" - Daily Orbit Update


MPEC 2011-W42 - "00:51 UT" - 2011 WK15

Observers  on 24 November '11

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

CodeObserver / observatory
A81Balzaretto Obs. in Italy, 1 in MPEC 2011-W43 -- 5143
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-W43 -- 2000 YJ29
703Catalina Sky Survey (CSS) in Arizona, 23 in MPEC 2011-W43 -- 2011 SR69, 2005 XB1, 2001 UE5, 96590, 85839, 85818, 305090, 303174, 302591, 26760, 24475, 190166, 18736, 163023, 162273, 143651, 138852, 11398, 11066, 3988, 2212, 2201, 1943
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2011-W42 & 2011-W43 -- 2011 WR2, 2011 WP4, 2011 WO4, 2011 WN2, 2011 WM2, 2011 WL2, 2011 WK15, 2011 WD, 2011 WC, 2008 CN70, 66251, 138013
448Desert Moon Obs. in New Mexico, 1 in MPEC 2011-W43 -- 2011 UZ275
639Dresden Obs. in Germany, 1 in MPEC 2011-W43 -- 2011 WA
A17Guidestar Obs. in Germany, 3 in MPEC 2011-W43 -- 2011 WV4, 2011 WM2, 2011 WJ15
246KLENOT in the Czech Republic, 3 in MPEC 2011-W43 -- 2011 WN2, 2011 WM2, 2011 WC
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 4 in MPEC 2011-W43 -- 2011 WQ2, 2011 TN9, 2011 LC19, 2001 YE4
046Klet Obs. in the Czech Republic, 2 in MPEC 2011-W43 -- 2011 WM2, 2011 WL2
704LINEAR in New Mexico, 10 in MPEC 2011-W43 -- 2011 SR69, 96590, 85628, 297418, 208617, 162273, 142348, 138852, 7341, 6050
I36Los Campitos Obs. in Argentina, 1 in MPEC 2011-W43 -- 2011 WM2
130Lumezzane Obs. in Italy, 4 in MPEC 2011-W43 -- 2011 WA, 2011 UU106, 2011 US63, 154302
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-W42 & 2011-W43 -- 2011 WK15, 101955
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2011-W43 -- 2011 NY, 285331, 162273, 9172, 4503
J69North Obs. in England, 1 in MPEC 2011-W43 -- 137671
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-W42 -- 2011 WK15
B49Paus Obs. in Spain, 1 in MPEC 2011-W43 -- 2005 YU55
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2011-W43 -- 2011 UU106, 2011 SL102
586Pic du Midi Obs. in France, 2 in MPEC 2011-W43 -- 2011 WU4, 2011 WK5
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2011-W43 -- 2005 XB1, 170502, 136923
I20Rio Cuarto Obs. in Argentina, 6 in MPEC 2011-W43 -- 2011 WP4, 2011 WN2, 2011 LC19, 2011 FZ2, 2007 SP6, 2006 UQ217
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-W43 -- 2005 YU55
H36Sandlot Obs. in Kansas, 6 in MPEC 2011-W43 -- 2011 WU4, 2011 WN2, 2011 VP12, 2009 WR6, 2004 TN, 1994 XL1
204Schiaparelli Obs. in Italy, 14 in MPECs 2011-W42 & 2011-W43 -- 2011 WQ2, 2011 WK15, 2011 UZ275, 2011 UW158, 2011 UV158, 2011 UL21, 2011 UL147, 2011 UG256, 2011 UA115, 2007 WU4, 2005 XB1, 2004 TN, 2003 YS17, 2002 CM1
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2011-W43 -- 2011 PT, 88264, 152941, 7977
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2011-W43 -- 2011 WK5, 2011 VR5, 2011 VH5, 2011 VG9, 2011 VF9, 2011 UZ255, 2011 UM147, 2011 UE256, 2011 TC4
A48Verona Obs. in Italy, 3 in MPEC 2011-W43 -- 2011 UU106, 2011 SR69, 2011 SL102
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 November '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2359 UTC, NEODyS unavailable)
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 WL15NEODyS17002022-2087247.27e-08-4.32-4.980NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-11-22.386 to 2011-11-23.298."
2011 WK15NEODyS17002020-2082271.96e-09-5.19-5.840NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-11-22.374 to 2011-11-23.921."
2011 WL2JPL Sentry17002060-2106153.8e-06-3.62-4.050JPL: "Analysis based on 94 observations spanning 7.5902 days (2011-Nov-16.31883 to 2011-Nov-23.90907)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS17002060-2090131.27e-07-4.97-5.50NEODyS: "Based on 94 optical observations (of which 0 are rejected as outliers) from 2011-11-16.320 to 2011-11-23.910."
2011 VG9JPL Sentry17002085-210484.6e-06-3.84-4.130JPL: "Analysis based on 43 observations spanning 8.0384 days (2011-Nov-15.37847 to 2011-Nov-23.41684)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
NEODyS17002085-208633.6e-06-3.94-4.180NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2011-11-15.379 to 2011-11-23.418."
2011 UZ255JPL Sentry1700207211.8e-05-3.95-3.950JPL: "Analysis based on 85 observations spanning 23.990 days (2011-Oct-30.44574 to 2011-Nov-23.43554)." Diameter approximately 0.075 km. from mean, weighted H=23.3.
NEODyS17002066-208941.28e-05-4.11-4.120NEODyS: "Based on 85 optical observations (of which 0 are rejected as outliers) from 2011-10-30.447 to 2011-11-23.436."

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 24 November '11

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

1700Noted that JPL Sentry has updated its 2011 UZ255 risk assessment - see above
Noted that NEODyS has updated its 2011 UZ255 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 NEODyS has posted 2011 WK15 as an impact risk - see above
Noted that NEODyS has posted 2011 WL15 as an impact risk - 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
Grabbed MPEC 2011-W43 - Daily Orbit Update - see above
0103Grabbed MPEC 2011-W42 - 2011 WK15 - see above