Contents  on 31 January '09

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 31 January '09

The MPC's NEO Confirmation Page has 5 listings: 2 new, 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and three updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of eleven objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 31 January '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-B93 - "16:59 UT" - 2009 BE77


MPEC 2009-B92 - "16:56 UT" - 2009 BD77


MPEC 2009-B91 - "16:30 UT" - Comet C/2009 B2 (LINEAR)


<< DOU on 31 Jan. '09 >>  MPEC 2009-B90 - "07:06 UT" - Daily Orbit Update


MPEC 2009-B89 - "00:02 UT" - 2009 BL71

Observers  on 31 January '09

A total of 27 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 3 in MPECs 2009-B90 & 2009-B93 -- 2009 BE77, 2009 AM, 2009 AL15
493Calar Alto Obs. in Spain, 3 in MPECs 2009-B89, 2009-B91 & 2009-B93 -- 2009 BL71, 2009 BE77, C/2009 B2
B09Capannoli Obs. in Italy, 1 in MPEC 2009-B90 -- 2009 BM2
160Castelmartini Obs. in Italy, 5 in MPEC 2009-B90 -- 2009 BM2, 2009 AD16, 2008 QT3, 35107, 141052
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2009-B89, 2009-B90 & 2009-B92 -- 2009 BL71, 2009 BD77, 2008 XE2, 2008 EE, 1999 CW8, 12538
850Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2009-B90 -- 2009 AE16, 2009 AD16
448Desert Moon Obs. in New Mexico, 7 in MPECs 2009-B90, 2009-B91, 2009-B92 & 2009-B93 -- 2009 BE77, 2009 BD77, C/2009 B2, 2009 AM, 2008 YS27, 2008 YG26, 2002 EZ2
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-B91 -- C/2009 B2
A17Guidestar Obs. in Germany, 3 in MPEC 2009-B90 -- 2009 BO58, 2009 BK58, 52768
704LINEAR in New Mexico, 7 in MPECs 2009-B90 & 2009-B91 -- 2009 BA11, C/2009 B2, 2008 XE3, 2000 BL19, 2000 AE6, 12711, 7358
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2009-B90 -- 1864
A99Monte Baldo Obs. in Italy, 1 in MPEC 2009-B90 -- 2009 BK71
474Mt. John Obs. in New Zealand, 1 in MPEC 2009-B93 -- 2009 BE77
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2009-B90 -- 2009 BG58, 2008 SQ1, 199801, 138911, 8034
A24New Millennium Obs. in Italy, 1 in MPEC 2009-B90 -- 2009 BK71
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2009-B90 -- 137925
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-B91 -- C/2009 B2
H06\B. Conklin via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-B90 -- 2008 RM98
B04Saint-Barthelemy Obs. in Italy, 3 in MPECs 2009-B89, 2009-B90 & 2009-B92 -- 2009 BL71, 2009 BG58, 2009 BD77
H36Sandlot Obs. in Kansas, 2 in MPECs 2009-B91 & 2009-B92 -- 2009 BD77, C/2009 B2
204Schiaparelli Obs. in Italy, 2 in MPECs 2009-B92 & 2009-B93 -- 2009 BE77, 2009 BD77
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2009-B90 & 2009-B93 -- 2009 BE77, 2006 SZ217, 4596
510Siegen Obs. in Germany, 1 in MPEC 2009-B90 -- 4179
587Sormano Obs. in Italy, 1 in MPEC 2009-B90 -- 2009 BL71
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-B91 -- C/2009 B2
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2009-B90 & 2009-B93 -- 2009 BQ5, 2009 BK2, 2009 BF58, 2009 BE77
611Starkenburg Obs. in Germany, 1 in MPEC 2009-B89 -- 2009 BL71
673Table Mtn. Obs. in southern California, 1 in MPEC 2009-B91 -- C/2009 B2
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2009-B92 & 2009-B93 -- 2009 BE77, 2009 BD77
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 January '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few 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
2009 BL71JPL Sentry16362021-2108882.4e-07-5.12-5.360JPL #2 for the day: "Analysis based on 19 observations spanning .72150 days (2009-Jan-30.26931 to 2009-Jan-30.99081)." Diameter approximately 0.132 km. from mean, weighted H=22.0.
NEODyS16362065-207722.82e-10-8.25-8.270NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2009/01/30.270 to 2009/01/30.992."
2009 BJ58NEODyS16362011-20871804.01e-07-2.69-3.450NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2009/01/29.140 to 2009/01/30.492."
JPL Sentry01542014-2061251.6e-07-3.00-3.330JPL: "Analysis based on 36 observations spanning 1.3518 days (2009-Jan-29.13966 to 2009-Jan-30.49147)." Diameter approximately 0.541 km. from mean, weighted H=19.0.
2009 BF58JPL Sentry16362055-2109593.6e-04-4.89-5.370JPL #2 for the day: "Analysis based on 33 observations spanning 2.9829 days (2009-Jan-28.26267 to 2009-Jan-31.24561)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
NEODyS16362057-2090302.25e-04-5.04-5.390NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/01/28.263 to 2009/01/31.246."
2009 BC58NEODyS16362019-2089325.94e-08-3.70-4.310NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/01/25.421 to 2009/01/30.388."
JPL Sentry00182019-2106254.7e-08-3.79-4.340JPL: "Analysis based on 25 observations spanning 4.9666 days (2009-Jan-25.4202 to 2009-Jan-30.38681)." Diameter approximately 0.898 km. from mean, weighted H=17.9.

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 31 January '09

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

1758Grabbed MPEC 2009-B91 - Comet C/2009 B2 (LINEAR) - see above
Grabbed MPEC 2009-B92 - 2009 BD77 - see above
Grabbed MPEC 2009-B93 - 2009 BE77 - see above
1636Noted that NEODyS has posted 2009 BC58 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 BF58 risk assessment - see above
Noted that NEODyS has posted 2009 BF58 as an impact risk - see above
Noted that NEODyS has posted 2009 BJ58 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 BL71 risk assessment - see above
Noted that NEODyS has posted 2009 BL71 as an impact risk - see above
Grabbed MPEC 2009-B90 - Daily Orbit Update - see above
0324Noted that JPL Sentry has posted 2009 BL71 as an impact risk - see above
0154Noted that JPL Sentry has posted 2009 BJ58 as an impact risk - see above
0106Noted that JPL Sentry has posted 2009 BF58 as an impact risk - see above
0018Noted that JPL Sentry has posted 2009 BC58 as an impact risk - see above
Grabbed MPEC 2009-B89 - 2009 BL71 - see above