Contents  on 25 April '10


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 25 April '10

The MPC's NEO Confirmation Page has 16 listings: 7 new, 9 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven new and nine updated listings. Of these, eight were "one nighters." So far The Tracking News has counted a total of nineteen listings on the NEOCP at some point 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 25 April '10

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2010-H62 - "17:37 UT" - 2010 HS20

MPEC 2010-H61 - "12:38 UT" - Comet C/2010 H4 (Scotti)

<< DOU on 25 Apr. '10 >>  MPEC 2010-H60 - "06:11 UT" - Daily Orbit Update

Observers  on 25 April '10

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2010-H60 -- 2010 GS7
I99Blanquita Obs. in Spain, 2 in MPEC 2010-H60 -- 2010 GU21, 2001 HC
151Eschenberg Obs. in Switzerland, 1 in MPEC 2010-H60 -- 2010 GU21
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2010-H61 -- C/2010 H4
A17Guidestar Obs. in Germany, 1 in MPEC 2010-H60 -- 2010 FF10
196Homburg-Erbach Obs. in Germany, 4 in MPEC 2010-H60 -- 2009 SO103, 68359, 141432, 4055
046Klet Obs. in the Czech Republic, 2 in MPEC 2010-H60 -- 2010 GU21, 2010 GA24
B33Libbiano Obs. in Italy, 1 in MPEC 2010-H60 -- 2010 FC
844Los Molinos Obs. in Uruguay, 1 in MPEC 2010-H60 -- 12923
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2010-H62 -- 2010 HS20
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-H60 -- 2004 TB18
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2010-H60 -- 2009 SO103, 2008 LW8, 1999 TA10
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2010-H62 -- 2010 HS20
204Schiaparelli Obs. in Italy, 9 in MPEC 2010-H60 -- 2010 HA, 2010 GZ5, 2010 GT7, 2010 GO67, 2010 GA34, 2008 GG2, 2003 HS42, 1999 TA10, 1999 JR6
A20Sogel Obs. in Germany, 1 in MPEC 2010-H60 -- 2007 JZ20
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2010-H60 & 2010-H61 -- C/2010 H4, 2010 EQ43
926Tenagra II Obs. in Arizona, 1 in MPEC 2010-H62 -- 2010 HS20
A48Verona Obs. in Italy, 1 in MPEC 2010-H60 -- 2010 GU21
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2010-H60 -- 85628
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 April '10

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.





Notes for Today's Latest Risk Assessments
2010 HS20JPL Sentry20472017-21071455.2e-06-4.42-4.960JPL: "Analysis based on 26 observations spanning 5.0682 days (2010-Apr-20.41913 to 2010-Apr-25.48733)." Diameter approximately 0.076 km. from mean, weighted H=23.3.

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 25 April '10

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

2047Noted that JPL Sentry has posted 2010 HS20 as an impact risk - see above
1800Grabbed MPEC 2010-H62 - 2010 HS20 - see above
1502Grabbed MPEC 2010-H60 - Daily Orbit Update - see above
Grabbed MPEC 2010-H61 - Comet C/2010 H4 (Scotti) - see above