Contents  on 15 April '08


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.

Radar Astrometry  on 15 April '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:

Data addition noted at 2354 UTC when the database was dated 15 April

NEOCP Activity  on 15 April '08

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and one updated listing. Both of these were "one nighters." So far The Tracking News has counted a total of fifteen 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 15 April '08

Minor Planet Electronic Circulars

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

MPEC 2008-G91 - "19:37 UT" - 2008 GJ110

MPEC 2008-G90 - "19:20 UT" - 2008 GH110

MPEC 2008-G89 - "19:11 UT" - 2008 GF110

MPEC 2008-G88 - "19:06 UT" - 2008 GE110

MPEC 2008-G87 - "19:04 UT" - 2008 GD110

MPEC 2008-G86 - "18:57 UT" - 2008 GC110

MPEC 2008-G85 - "18:54 UT" - 2008 GB110

MPEC 2008-G84 - "18:48 UT" - 2008 GA110

<< DOU on 15 Apr. '08 >>  MPEC 2008-G83 - "06:09 UT" - Daily Orbit Update

Observers  on 15 April '08

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2005 NB7
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2008-G83, 2008-G84, 2008-G86, 2008-G88, 2008-G89, 2008-G90 & 2008-G91 -- 2008 GJ110, 2008 GH110, 2008 GF110, 2008 GE110, 2008 GC110, 2008 GB4, 2008 GA110
A81Balzaretto Obs. in Italy, 1 in MPEC 2008-G83 -- 2005 NB7
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2008-G83, 2008-G87 & 2008-G91 -- 2008 GP20, 2008 GJ110, 2008 GD110, 2008 EC69, 2008 BC22, 2001 HY7, 1998 KG3, 86667, 164202, 154988, 9400, 4503
448Desert Moon Obs. in New Mexico, 2 in MPECs 2008-G86 & 2008-G90 -- 2008 GH110, 2008 GC110
734Farpoint Obs. in Kansas, 2 in MPECs 2008-G84 & 2008-G86 -- 2008 GC110, 2008 GA110
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-G91 -- 2008 GJ110
704LINEAR in New Mexico, 12 in MPECs 2008-G83 & 2008-G85 -- 2008 GB110, 2008 EM9, 2002 FW5, 1999 TA10, 1998 KG3, 86667, 68278, 137170, 9400, 5836, 5626, 4503
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2008-G83, 2008-G85, 2008-G86, 2008-G88, 2008-G89 & 2008-G90 -- 2008 GH110, 2008 GF110, 2008 GE110, 2008 GC110, 2008 GB110, 2008 EE9, 2004 HW
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2008-G83 -- 137170
649Powell Obs. in Kansas, 3 in MPEC 2008-G83 -- 2008 GW20, 2008 GP20, 2008 GB21
D90.Cristovao Jacques in Brazil via RAS Obs. Moorook in South Australia, 1 in MPEC 2008-G87 -- 2008 GD110
854Sabino Canyon Obs. in Arizona, 4 in MPECs 2008-G85, 2008-G87, 2008-G90 & 2008-G91 -- 2008 GJ110, 2008 GH110, 2008 GD110, 2008 GB110
260&Rob Matson in southern California using the Siding Spring Digitized Sky Survey in New South Wales, 1 in MPEC 2008-G83 -- 2007 AE12
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2008-G83, 2008-G84 & 2008-G86 -- 2008 GC110, 2008 GA4, 2008 GA110, 53435, 4503
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2008-G83, 2008-G84, 2008-G86 & 2008-G88 -- 2008 GM2, 2008 GE110, 2008 GC110, 2008 GA4, 2008 GA110, 2008 FT6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 April '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.





Notes for Today's Latest Risk Assessments
2008 GH110JPL Sentry22012024-2107261.2e-08-5.25-5.940JPL: "Analysis based on 16 observations spanning .89806 days (2008-Apr-14.46285 to 2008-Apr-15.36091)." Diameter approximately 0.330 km. from mean, weighted H=20.0.
2008 GD110JPL Sentry22012042-2097255.7e-06-5.19-5.890JPL: "Analysis based on 14 observations spanning 1.1658 days (2008-Apr-14.28705 to 2008-Apr-15.45285)." Diameter approximately 0.043 km. from mean, weighted H=24.5.
2008 GA110JPL Sentry2201210511.8e-10-8.59-8.590JPL: "Analysis based on 18 observations spanning .99783 days (2008-Apr-14.19339 to 2008-Apr-15.191224)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
2008 GY21NEODyS14082038-2086119.22e-08-8.30-8.770NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/04/13.269 to 2008/04/14.327."
2008 GM2NEODyS14082063-2090129.55e-07-8.00-8.300NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/14.259."
JPL Sentry14072063-2108431.8e-05-6.82-7.500JPL: "Analysis based on 54 observations spanning 7.8454 days (2008-Apr-06.41278 to 2008-Apr-14.25814)." Diameter approximately 0.007 km. from mean, weighted H=28.4.

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 15 April '08

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

2354Noted Radar Astrometry database addition - see above
2201Noted that JPL Sentry has posted 2008 GA110 as an impact risk - see above
Noted that JPL Sentry has posted 2008 GD110 as an impact risk - see above
Noted that JPL Sentry has posted 2008 GH110 as an impact risk - see above
1948Grabbed MPEC 2008-G84 - 2008 GA110 - see above
Grabbed MPEC 2008-G85 - 2008 GB110 - see above
Grabbed MPEC 2008-G86 - 2008 GC110 - see above
Grabbed MPEC 2008-G87 - 2008 GD110 - see above
Grabbed MPEC 2008-G88 - 2008 GE110 - see above
Grabbed MPEC 2008-G89 - 2008 GF110 - see above
Grabbed MPEC 2008-G90 - 2008 GH110 - see above
Grabbed MPEC 2008-G91 - 2008 GJ110 - see above
1408Noted that NEODyS has updated its 2008 GM2 risk assessment - see above
Grabbed MPEC 2008-G83 - Daily Orbit Update - see above
1407Noted that JPL Sentry has updated its 2008 GM2 risk assessment - see above
Noted that NEODyS has posted 2008 GY21 as an impact risk - see above