Contents  on 27 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 27 November '11

The MPC's NEO Confirmation Page has 50 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 50 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 68 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 27 November '11

Minor Planet Electronic Circulars

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


MPEC 2011-W65 - "21:28 UT" - 2011 UG169


MPEC 2011-W64 - "16:14 UT" - 2005 UJ159


<< DOU on 27 Nov. '11 >>  MPEC 2011-W63 - "06:05 UT" - Daily Orbit Update


MPEC 2011-W62 - "00:46 UT" - 2011 WG44


MPEC 2011-W61 - "00:39 UT" - 2011 WF44


MPEC 2011-W60 - "00:05 UT" - 2011 WE44

Observers  on 27 November '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2011-W63 -- 2011 FZ2
B66Casasco Obs. in Italy, 12 in MPEC 2011-W63 -- 2011 SL102, 2005 YU55, 170502, 7358, 7341, 5653, 5143, 4503, 4183, 3988, 3691, 3200
160Castelmartini Obs. in Italy, 3 in MPEC 2011-W63 -- 2011 RR12, 137671, 433
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2011-W60, 2011-W61 & 2011-W63 -- 2011 WF44, 2011 WE44, 2011 WE32, 2011 WC39, 2011 UG21, 2011 QF14, 2011 GD62, 141056, 2340
C73Galati Obs. in Romania, 4 in MPEC 2011-W63 -- 283460, 175706, 154656, 154330
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2011-W63 -- 2011 SL102, 37336, 170502, 3200, 2201, 1036
A14Les Engarouines Obs. in France, 1 in MPEC 2011-W63 -- 6050
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2011-W63, 2011-W64 & 2011-W65 -- 2011 UV63, 2011 UG169, 2011 UF21, 2005 UJ159
474Mt. John Obs. in New Zealand, 14 in MPEC 2011-W63 -- 2011 WO4, 2011 WM2, 2011 WL2, 2011 WL15, 2011 WE32, 2011 WC, 2011 VP12, 2011 VO5, 2011 UY255, 2011 UQ91, 2011 UG256, 2011 SO26, 2011 QD48, 2004 BX1
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-W61, 2011-W62 & 2011-W63 -- 2011 WG44, 2011 WF44, 275714, 159495, 137925
A13Naef Obs. in Switzerland, 1 in MPEC 2011-W63 -- 138852
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2011-W60, 2011-W63 & 2011-W65 -- 2011 WL2, 2011 WE44, 2011 UG169, 2011 SF3, 202435, 163051, 141079, 138852
104San Marcello Pistoiese Obs. in Italy, 6 in MPECs 2011-W60, 2011-W61, 2011-W62 & 2011-W63 -- 2011 WG44, 2011 WF44, 2011 WE44, 2011 WC44, 2011 LD19, 15817
204Schiaparelli Obs. in Italy, 3 in MPECs 2011-W60, 2011-W61 & 2011-W65 -- 2011 WF44, 2011 WE44, 2011 UG169
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-W63 -- 2011 PT, 242216
291Spacewatch 1.8m telescope in Arizona, 18 in MPEC 2011-W63 -- 2011 WL2, 2011 WL15, 2011 WK5, 2011 WB, 2011 VG9, 2011 VB, 2011 UZ255, 2011 UY114, 2011 UW158, 2011 UG256, 2011 UD115, 2011 UA115, 2011 TP6, 2011 QP96, 2010 SO16, 2005 VN, 2002 AC, 2000 YF29
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 Sentry1645R E M O V E DJPL: Risk listing removed at 0950 UTC.
NEODyS1645R E M O V E D-
2011 WL2JPL Sentry16452097-210952.8e-07-4.79-5.140JPL: "Analysis based on 113 observations spanning 10.898 days (2011-Nov-16.31883 to 2011-Nov-27.21676)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS1645R E M O V E D-
2011 VG9JPL Sentry16452086-210561.9e-06-4.22-4.510JPL: "Analysis based on 48 observations spanning 10.962 days (2011-Nov-15.37847 to 2011-Nov-26.34017)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
NEODyS16452086-208621.09e-06-4.46-4.710NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2011-11-15.379 to 2011-11-26.341."
2011 UZ255JPL Sentry16452066-207233.6e-05-3.65-3.650JPL: "Analysis based on 91 observations spanning 26.927 days (2011-Oct-30.44574 to 2011-Nov-26.37246)." Diameter approximately 0.075 km. from mean, weighted H=23.3.
NEODyS16452069-207222.89e-05-3.75-3.750NEODyS: "Based on 91 optical observations (of which 0 are rejected as outliers) from 2011-10-30.447 to 2011-11-26.373."
2011 UG169JPL Sentry2304R E M O V E DJPL: Risk listing removed at 2248 UTC.

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 27 November '11

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

2304Noted that JPL Sentry has removed 2011 UG169 as an impact risk - see above
2203Grabbed MPEC 2011-W65 - 2011 UG169 - see above
1645Noted 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 JPL Sentry has removed 2011 WL15 as an impact risk - see above
Noted that NEODyS has removed 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 removed 2011 WL2 as an impact risk - see above
Grabbed MPEC 2011-W63 - Daily Orbit Update - see above
Grabbed MPEC 2011-W64 - 2005 UJ159 - see above
0105Grabbed MPEC 2011-W61 - 2011 WF44 - see above
Grabbed MPEC 2011-W62 - 2011 WG44 - see above
0028Grabbed MPEC 2011-W60 - 2011 WE44 - see above