Contents  on 19 April '09


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 19 April '09

The MPC's NEO Confirmation Page has 10 listings: 3 new, 7 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and seven updated listings. Of these, five were "one nighters."

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 19 April '09

Minor Planet Electronic Circulars

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

<< DOU on 19 Apr. '09 >>  MPEC 2009-H17 - "06:06 UT" - Daily Orbit Update

Observers  on 19 April '09

Fourteen observing facilities appear in today's MPEC.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2009-H17 -- 2009 HD
H55Astronomical Research Obs. (ARO) in Illinois, 20 in MPEC 2009-H17 -- 2009 FY29, 2009 FU23, 2009 FN28, 2009 FJ30, 2009 ED1, 2009 DQ4, 2009 DF1, 2009 DE47, 2009 BL2, 2009 BD77, 2009 AH16, 2008 YK2, 2008 WL60, 2008 UC, 2008 JV19, 2005 WR54, 2005 VY17, 2004 JN13, 2000 FL1, 1998 SC15
432Boambee Obs. in New South Wales, 3 in MPEC 2009-H17 -- 2005 SG19, 18882, 3552
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2009-H17 -- 2009 DE47, 86666, 211871, 208565, 162900, 1863
704LINEAR in New Mexico, 6 in MPEC 2009-H17 -- 2009 HD, 90367, 86666, 85989, 15745, 141531
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-H17 -- 2003 UN12
J93Mt. Tuffley Obs. in England, 4 in MPEC 2009-H17 -- 2008 SV11, 143651, 5604, 1036
A13Naef Obs. in Switzerland, 3 in MPEC 2009-H17 -- 2008 SQ7, 2000 FL1, 3103
D90.Cristovao Jacques in Brazil via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-H17 -- 2009 HG
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2009-H17 -- 2009 HG, 137078, 136617, 3199
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-H17 -- 99799
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2009-H17 -- 2009 FP29, 2009 FN28, 2009 EG3, 2009 DZ42, 2009 CS5, 2009 CB3, 2006 MX13
H83Timberlake Obs. in Virginia, 1 in MPEC 2009-H17 -- 2009 FU23
A48Verona Obs. in Italy, 1 in MPEC 2009-H17 -- 2009 FU23
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 April '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.





Notes for Today's Latest Risk Assessments
2009 HENEODyS15032014-20901042.12e-08-4.70-5.220NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2009/04/17.305 to 2009/04/18.275."

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 19 April '09

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

1503Noted that NEODyS has posted 2009 HE as an impact risk - see above
Grabbed MPEC 2009-H17 - Daily Orbit Update - see above