Contents  on 22 April '08


NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, for the rest of April.

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 22 April '08

Not active

The Minor Planet Center's NEO discovery Confirmation Page (NEOCP) was not active on this day.

New MPECs  on 22 April '08

Minor Planet Electronic Circulars

There were eight MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-H20 - "18:57 UT" - Comet P/1994 J3 = 2008 G2 (Shoemaker)

MPEC 2008-H19 - "15:26 UT" - PHAs

MPEC 2008-H18 - "15:26 UT" - Unusual Minor Planets

MPEC 2008-H17 - "15:26 UT" - Amors

MPEC 2008-H16 - "15:26 UT" - Atens and Apollos

MPEC 2008-H15 - "15:19 UT" - Distant Minor Planets

MPEC 2008-H14 - "14:54 UT" - Observable Comets

<< DOU on 22 Apr. '08 >>  MPEC 2008-H13 - "06:06 UT" - Daily Orbit Update

Observers  on 22 April '08

Seven observing facilities appeared in this day's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 2 in MPEC 2008-H13 -- 2008 HE, 2008 GJ110
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-H20 -- P/2008 G2
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-H13 -- 2008 GX, 2008 GW20, 2008 GP20, 2008 EQ7
H51Greiner Research Obs. (GRO) in Wisconsin, 2 in MPEC 2008-H13 -- 2008 GV3, 2005 NB7
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-H13 -- 2008 GU3
D90.Cristovao Jacques in Brazil via RAS Obs. Moorook in South Australia, 1 in MPEC 2008-H13 -- 2008 HE
A92Urseanu Obs. in Romania, 2 in MPEC 2008-H13 -- 2005 NB7, 137170
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 HENEODyS13352053-207136.19e-10-5.19-5.420NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2008/04/18.139 to 2008/04/21.124."
JPL Sentry13342036-209162.2e-09-4.60-5.190JPL: "Analysis based on 32 observations spanning 2.9848 days (2008-Apr-18.13869 to 2008-Apr-21.123445)." Diameter approximately 0.889 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 22 April '08

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

2354Grabbed MPEC 2008-H20 - Comet P/1994 J3 = 2008 G2 (Shoemaker) - see above
1528Grabbed MPEC 2008-H14 - Observable Comets - see above
Grabbed MPEC 2008-H15 - Distant Minor Planets - see above
Grabbed MPEC 2008-H16 - Atens and Apollos - see above
Grabbed MPEC 2008-H17 - Amors - see above
Grabbed MPEC 2008-H18 - Unusual Minor Planets - see above
Grabbed MPEC 2008-H19 - PHAs - see above
1334Noted that JPL Sentry has posted 2008 HE as an impact risk - see above
Noted that NEODyS has posted 2008 HE as an impact risk - see above
Grabbed MPEC 2008-H13 - Daily Orbit Update - see above