Contents  on 25 February '11


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 25 February '11

The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of nine 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 25 February '11

Minor Planet Electronic Circulars

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

MPEC 2011-D40 - "23:09 UT" - 2011 DY4

MPEC 2011-D39 - "23:04 UT" - 2011 DX4

MPEC 2011-D38 - "23:00 UT" - 2011 DW4

<< DOU on 25 Feb. '11 >>  MPEC 2011-D37 - "07:06 UT" - Daily Orbit Update

Observers  on 25 February '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-D38 & 2011-D40 -- 2011 DY4, 2011 DW4
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-D40 -- 2011 DY4
113Drebach Obs. in Germany, 1 in MPEC 2011-D40 -- 2011 DY4
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-D37 -- 2011 DR
704LINEAR in New Mexico, 9 in MPEC 2011-D37 -- 2011 CY46, 2009 DV42, 2004 CK39, 2002 SZ, 96590, 259802, 250614, 162463, 1864
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 3 in MPEC 2011-D37 -- 2011 BC40, 2010 DA, 2008 RG1
J75La Sagra Obs. in Spain, 2 in MPEC 2011-D37 -- 40267, 144332
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2011-D38, 2011-D39 & 2011-D40 -- 2011 DY4, 2011 DX4, 2011 DW4
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-D37 -- 2011 BG59
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-D37, 2011-D38 & 2011-D39 -- 2011 DX4, 2011 DW4, 2011 BV15
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-D37 -- 215167
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-D37 -- 2011 DW
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-D37 -- 1998 HE3
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2011-D37 -- 2011 CG33, 2011 BX59, 2011 BT15, 2011 BG40, 2011 BB45, 2011 BA45, 2010 YB, 2007 TA19
926Tenagra II Obs. in Arizona, 2 in MPEC 2011-D37 -- 2011 CU4, 2011 CP4
A48Verona Obs. in Italy, 2 in MPEC 2011-D37 -- 2011 CY46, 2011 BO59
C42Xingming Obs. in China, 1 in MPEC 2011-D37 -- 2011 DO
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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.





Notes for Today's Latest Risk Assessments
2011 DVNEODyS16272029-2090221.29e-06-4.03-4.190NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-02-24.177."
2011 BT15JPL Sentry16272037-2096927.3e-05-2.94-3.790JPL: "Analysis based on 46 observations spanning 31.858 days (2011-Jan-24.28933 to 2011-Feb-25.14709)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS16272037-2090754.88e-05-3.07-3.760NEODyS: "Based on 47 optical observations (of which 3 are rejected as outliers) from 2011-01-24.290 to 2011-02-25.148."
2011 AM37JPL Sentry03592044-21081211.1e-03-5.43-5.780JPL: "Analysis based on 17 observations spanning 1.0662 days (2011-Jan-13.33014 to 2011-Jan-14.39637)." Diameter approximately 0.004 km. from mean, weighted H=29.7.
2010 XRJPL Sentry0359201315.3e-06-4.62-4.620JPL: "Analysis based on 14 observations spanning 3.0869 days (2010-Dec-02.35142 to 2010-Dec-05.43837)." Diameter approximately 0.015 km. from mean, weighted H=26.8.

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 25 February '11

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

2359Grabbed MPEC 2011-D38 - 2011 DW4 - see above
Grabbed MPEC 2011-D39 - 2011 DX4 - see above
Grabbed MPEC 2011-D40 - 2011 DY4 - see above
1627Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has posted 2011 DV as an impact risk - see above
Grabbed MPEC 2011-D37 - Daily Orbit Update - see above
0359Noted that JPL Sentry has updated its 2010 XR risk assessment - see above
Noted that JPL Sentry has posted 2011 AM37 as an impact risk - see above