Contents  on 26 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 26 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 twelve 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 26 February '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-D45 - "21:12 UT" - 2011 DT9


MPEC 2011-D44 - "21:07 UT" - 2011 DS9


MPEC 2011-D43 - "11:14 UT" - 2011 DE5


MPEC 2011-D42 - "09:43 UT" - 2011 DD5


<< DOU on 26 Feb. '11 >>  MPEC 2011-D41 - "07:07 UT" - Daily Orbit Update

Observers  on 26 February '11

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

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-D45 -- 2011 DT9
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2011-D41 -- 1864
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-D45 -- 2011 DT9
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2011-D41, 2011-D42, 2011-D44 & 2011-D45 -- 2011 DT9, 2011 DS9, 2011 DD5, 2011 CY6, 2011 AF37, 2005 GW119, 2004 EM20, 2002 TD60, 1999 PJ1, 40267, 36284, 264308, 204232, 163412, 4660
113Drebach Obs. in Germany, 2 in MPECs 2011-D44 & 2011-D45 -- 2011 DT9, 2011 DS9
639Dresden Obs. in Germany, 1 in MPEC 2011-D41 -- 2011 CG2
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2011-D41 & 2011-D45 -- 2011 DY4, 2011 DT9
203GiaGa Obs. in Italy, 7 in MPECs 2011-D41 & 2011-D44 -- 2011 DY4, 2011 DS9, 2011 DO, 2011 CH71, 2011 CG2, 2011 BO59, 2011 BA12
J95Great Shefford Obs. in England, 1 in MPEC 2011-D45 -- 2011 DT9
704LINEAR in New Mexico, 10 in MPECs 2011-D41 & 2011-D42 -- 2011 DD5, 2009 BH81, 2004 CK39, 68350, 259802, 25916, 243025, 18882, 162781, 2062
J75La Sagra Obs. in Spain, 5 in MPECs 2011-D41 & 2011-D44 -- 2011 DS9, 2011 BA12, 48603, 22771, 215167
560Madonna di Dossobuono Obs. in Italy, 3 in MPEC 2011-D41 -- 2011 CH71, 2011 CG2, 2011 BO59
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-D41 & 2011-D43 -- 2011 DV, 2011 DS, 2011 DE5, 2010 QE2
900Moriyama Obs. in Japan, 1 in MPEC 2011-D45 -- 2011 DT9
474Mt. John Obs. in New Zealand, 2 in MPECs 2011-D44 & 2011-D45 -- 2011 DT9, 2011 DS9
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2011-D41, 2011-D43 & 2011-D44 -- 2011 DS9, 2011 DE5, 2010 YB, 2005 GW119, 2001 CA32, 22771, 175189, 152671, 5189
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2011-D41 -- 2007 DU103, 2006 RA55, 2005 EG94, 2001 RP17, 2000 QN130, 86819
291Spacewatch 1.8m telescope in Arizona, 15 in MPEC 2011-D41 -- 2011 DV, 2011 DU, 2011 DS, 2011 CS4, 2011 CR1, 2011 CP4, 2011 CB50, 2011 BV15, 2011 BD40, 2011 BA12, 2011 AR26, 2011 AH37, 2010 GR7, 2003 FQ6, 2000 PO30
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-D41 -- 4954
A48Verona Obs. in Italy, 1 in MPEC 2011-D41 -- 2011 BO59
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 DS9JPL Sentry23292015-21102501.2e-06-3.07-3.490JPL: "Analysis based on 19 observations spanning .92041 days (2011-Feb-25.92799 to 2011-Feb-26.8484)." Diameter approximately 0.350 km. from mean, weighted H=19.9.
2011 DE5JPL Sentry17282014-2045193.0e-05-4.54-4.810JPL: "Analysis based on 12 observations spanning .92819 days (2011-Feb-25.33918 to 2011-Feb-26.26737)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
2011 DY4JPL Sentry1728R E M O V E DJPL #2 for the day: Risk listing removed at 1054 UTC.
2011 DX4NEODyS21022057-205713.7e-11-10.55-10.550NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2011-02-25.191 to 2011-02-25.365."
JPL Sentry01502012-2111439.8e-08-7.36-7.680JPL: "Analysis based on 12 observations spanning .17442 days (2011-Feb-25.19028 to 2011-Feb-25.3647)." Diameter approximately 0.016 km. from mean, weighted H=26.6.
2011 DVNEODyS21022026-2090834.21e-05-2.23-2.730NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-02-25.519."
2011 DSJPL Sentry17282054-2109191.1e-05-6.27-6.510JPL: "Analysis based on 22 observations spanning 1.9820 days (2011-Feb-23.39905 to 2011-Feb-25.38109)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS17282067-2088118.16e-06-6.38-6.530NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-02-23.400 to 2011-02-25.382."
2011 CB50JPL Sentry1728R E M O V E DJPL: Risk listing removed at 1130 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 26 February '11

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

2329Noted that JPL Sentry has posted 2011 DS9 as an impact risk - see above
2144Grabbed MPEC 2011-D44 - 2011 DS9 - see above
Grabbed MPEC 2011-D45 - 2011 DT9 - see above
2102Noted that NEODyS has updated its 2011 DV risk assessment - see above
Noted that NEODyS has posted 2011 DX4 as an impact risk - see above
1728Noted that JPL Sentry has removed 2011 CB50 as an impact risk - see above
Noted that JPL Sentry has posted 2011 DE5 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 DS risk assessment - see above
Noted that NEODyS has updated its 2011 DS risk assessment - see above
Noted that JPL Sentry has removed 2011 DY4 as an impact risk - see above
Grabbed MPEC 2011-D41 - Daily Orbit Update - see above
Grabbed MPEC 2011-D42 - 2011 DD5 - see above
Grabbed MPEC 2011-D43 - 2011 DE5 - see above
0150Noted that JPL Sentry has posted 2011 DX4 as an impact risk - see above
0101Noted that JPL Sentry has posted 2011 DY4 as an impact risk - see above