Contents  on 20 March '08

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 20 March '08

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings. Both of these were "one nighters." So far The Tracking News has counted a total of six 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 20 March '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been three MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-F13 - "20:44 UT" - 2008 EN82


MPEC 2008-F12 - "11:23 UT" - 2008 EZ97


<< DOU on 20 Mar. '08 >>  MPEC 2008-F11 - "06:10 UT" - Daily Orbit Update

Observers  on 20 March '08

Nine observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2008-F11 -- 2008 CH
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-F13 -- 2008 EN82
448Desert Moon Obs. in New Mexico, 8 in MPEC 2008-F11 -- 2008 EZ5, 2008 EQ7, 2008 EO6, 2008 CZ118, 2008 CM, 2002 AJ129, 85818, 154988
J95Great Shefford Obs. in England, 2 in MPEC 2008-F11 -- 2008 EM85, 2007 VQ4
704LINEAR in New Mexico, 2 in MPEC 2008-F11 -- 2007 VY7, 53319
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2008-F11 & 2008-F12 -- 2008 EZ97, 2008 ER7, 2008 ED69, 2008 EC69, 2008 EA9
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-F11 -- 2008 EA9
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-F12 -- 2008 EZ97
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2008-F13 -- 2008 EN82

Impact Risk Monitoring  on 20 March '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
2008 EZ97JPL Sentry1331208811.4e-10-7.57-7.570JPL: "Analysis based on 15 observations spanning 4.9099 days (2008-Mar-15.49955 to 2008-Mar-20.40947)." Diameter approximately 0.440 km. from mean, weighted H=19.4.
2008 ED69NEODyS1331R E M O V E D
2008 EC69NEODyS13322049-2088241.71e-07-3.00-3.130NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2008/03/11.497 to 2008/03/19.385."
JPL Sentry13312032-2105182.0e-07-2.91-3.080JPL: "Analysis based on 42 observations spanning 7.8882 days (2008-Mar-11.49608 to 2008-Mar-19.38432)." Diameter approximately 1.300 km. from mean, weighted H=17.1.
2008 EA9NEODyS13322044-2090233.41e-05-6.16-6.720NEODyS: "Based on 32 optical observations (of which 1 are rejected as outliers) from 2008/03/06.406 to 2008/03/19.415."
JPL Sentry13312068-210683.2e-05-6.21-6.700JPL: "Analysis based on 31 observations spanning 13.009 days (2008-Mar-06.40551 to 2008-Mar-19.41444)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
2008 ER7NEODyS13322059-209061.31e-06-3.46-3.460NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/03/19.375."
JPL Sentry13312063-2105329.1e-06-2.66-3.030JPL: "Analysis based on 48 observations spanning 13.039 days (2008-Mar-06.33608 to 2008-Mar-19.37463)." Diameter approximately 0.336 km. from mean, weighted H=20.0.

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 20 March '08

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

2247Grabbed MPEC 2008-F13 - 2008 EN82 - see above
1332Noted that NEODyS has updated its 2008 EA9 risk assessment - see above
Noted that NEODyS has updated its 2008 EC69 risk assessment - see above
Noted that NEODyS has updated its 2008 ER7 risk assessment - see above
1331Noted that JPL Sentry has updated its 2008 EA9 risk assessment - see above
Noted that JPL Sentry has updated its 2008 EC69 risk assessment - see above
Noted that NEODyS has removed 2008 ED69 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above
Noted that JPL Sentry has posted 2008 EZ97 as an impact risk - see above
Grabbed MPEC 2008-F11 - Daily Orbit Update - see above
Grabbed MPEC 2008-F12 - 2008 EZ97 - see above