Contents  on 27 February '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 February '11

The MPC's NEO Confirmation Page has 6 listings: 5 new, 1 updated

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


MPEC 2011-D47 - "22:44 UT" - 2011 DU9


<< DOU on 27 Feb. '11 >>  MPEC 2011-D46 - "07:07 UT" - Daily Orbit Update

Observers  on 27 February '11

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2011-D46 -- 2011 DT9, 4954, 1864
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2011-D46 -- 2003 WX87, 265482
113Drebach Obs. in Germany, 2 in MPEC 2011-D46 -- 2011 CY46, 2011 BA12
F65%T. Lister via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-D46 -- 2011 BT15
J95Great Shefford Obs. in England, 2 in MPECs 2011-D46 & 2011-D47 -- 2011 DW, 2011 DU9
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2011-D46 -- 2011 CH71
J28Jaen Obs. in Spain, 2 in MPEC 2011-D46 -- 2011 BO59, 4954
J75La Sagra Obs. in Spain, 5 in MPECs 2011-D46 & 2011-D47 -- 2011 DU9, 15745, 7480, 4954, 4401
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-D46 -- 2011 BM59
118Modra Obs. in Slovakia, 1 in MPEC 2011-D46 -- 2011 DT9
474Mt. John Obs. in New Zealand, 10 in MPECs 2011-D46 & 2011-D47 -- 2011 DY4, 2011 DW, 2011 DU9, 2011 DU, 2011 DS, 2011 DQ, 2011 CY7, 2011 CH50, 2011 CB50, 2011 BZ18
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPEC 2011-D46 -- 2011 CX46, 2011 CS4, 2001 DQ8, 53550, 22771, 163250, 4015
J93Mt. Tuffley Obs. in England, 2 in MPEC 2011-D46 -- 36284, 4954
H23Pear Tree Obs. in Florida, 3 in MPEC 2011-D46 -- 2011 CY46, 2011 CH71, 2011 CG2
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-D46 -- 2004 EK1
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-D46 -- 2004 EK1
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-D46 -- 86819
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-D46 -- 2011 DY4, 2011 DS, 2011 CP4
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-D47 -- 2011 DU9
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-D46 -- 36284
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 February '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 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
2011 DS9NEODyS17262015-20901028.2e-07-3.21-3.560NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-02-25.929 to 2011-02-26.849."
2011 DE5NEODyS17262018-2082242.99e-05-4.57-4.870NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2011-02-25.340 to 2011-02-26.268."
2011 DSJPL Sentry19072065-2109191.4e-05-6.22-6.460JPL: "Analysis based on 29 observations spanning 3.1552 days (2011-Feb-23.39905 to 2011-Feb-26.55428)." Diameter approximately 0.013 km. from mean, weighted H=27.2.
NEODyS19072065-2089131.14e-05-6.28-6.460NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-02-23.400 to 2011-02-26.555."
2011 BT15JPL Sentry20152037-21101219.5e-05-2.82-3.640JPL: "Analysis based on 53 observations spanning 32.981 days (2011-Jan-24.28933 to 2011-Feb-26.27045)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS20152037-2090854.83e-05-3.05-3.690NEODyS: "Based on 54 optical observations (of which 3 are rejected as outliers) from 2011-01-24.290 to 2011-02-26.271."

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 February '11

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

2303Grabbed MPEC 2011-D47 - 2011 DU9 - see above
2015Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
1907Noted that JPL Sentry has updated its 2011 DS risk assessment - see above
Noted that NEODyS has updated its 2011 DS risk assessment - see above
1726Noted that NEODyS has posted 2011 DE5 as an impact risk - see above
Noted that NEODyS has posted 2011 DS9 as an impact risk - see above
Grabbed MPEC 2011-D46 - Daily Orbit Update - see above