Contents  on 27 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 27 April '09

The MPC's NEO Confirmation Page has 7 listings: 2 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and five updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of fourteen 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 27 April '09

Minor Planet Electronic Circulars

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

MPEC 2009-H63 - "17:21 UT" - 2009 HG60

MPEC 2009-H62 - "17:15 UT" - 2009 HF60

MPEC 2009-H61 - "17:06 UT" - 2009 HE60

<< DOU on 27 Apr. '09 >>  MPEC 2009-H60 - "06:08 UT" - Daily Orbit Update

Observers  on 27 April '09

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
432Boambee Obs. in New South Wales, 3 in MPEC 2009-H60 -- 2005 SG19, 18882, 3552
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2009-H60, 2009-H62 & 2009-H63 -- 2009 HG60, 2009 HF60, 2009 EQ2, 2009 BP58, 68350, 138883
I21El Condor Obs. in Argentina, 4 in MPEC 2009-H60 -- 2009 HV44, 2009 DL1, 2009 DE47, 2008 WN2
J95Great Shefford Obs. in England, 1 in MPEC 2009-H60 -- 2009 HS44
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2009-H60 -- 2009 DE47, 2008 WL60, 2008 SV11, 2007 BT2
704LINEAR in New Mexico, 5 in MPEC 2009-H60 -- 2009 HL21, 2007 BT2, 35107, 208565, 5332
900Moriyama Obs. in Japan, 1 in MPEC 2009-H63 -- 2009 HG60
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2009-H61 & 2009-H62 -- 2009 HF60, 2009 HE60
A13Naef Obs. in Switzerland, 1 in MPEC 2009-H60 -- 2009 DF1
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPECs 2009-H62 & 2009-H63 -- 2009 HG60, 2009 HF60
D29Purple Mtn. Obs. XuYi Station (XuYi Sta.) in China, 2 in MPEC 2009-H60 -- 2005 SA71, 212546
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-H63 -- 2009 HG60
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2009-H60 -- 5626, 1943
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2009-H60 & 2009-H62 -- 2009 HY51, 2009 HX51, 2009 HU2, 2009 HF60, 2009 HD21, 2009 HC, 2009 FY10, 2009 FT4, 2009 FF44, 2009 FF19, 2009 FF, 2009 CS, 2006 PW
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2009-H63 -- 2009 HG60
H53Thompsonville Obs. in Illinois, 3 in MPEC 2009-H60 -- 175706, 143651, 3554
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 April '09

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. 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 HE60JPL Sentry1901206615.5e-09-8.76-8.760JPL: "Analysis based on 16 observations spanning 3.0287 days (2009-Apr-24.23861 to 2009-Apr-27.26731)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2009 HV58NEODyS15312013-2065244.92e-10-5.31-6.110NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/04/26.428."
2009 HD21NEODyS15312022-2089192.09e-07-2.71-2.730NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2009/04/20.327 to 2009/04/26.375."
JPL Sentry13242022-2102233.1e-07-2.69-2.740JPL: "Analysis based on 34 observations spanning 6.0484 days (2009-Apr-20.32627 to 2009-Apr-26.37463)." Diameter approximately 0.795 km. from mean, weighted H=18.2.
2009 HU2NEODyS16002049-2067164.18e-07-3.09-3.660NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2009/04/19.132 to 2009/04/26.236."
JPL Sentry13242057-2067122.2e-07-3.39-4.050JPL: "Analysis based on 46 observations spanning 7.1031 days (2009-Apr-19.13168 to 2009-Apr-26.2348)." Diameter approximately 0.791 km. from mean, weighted H=18.2.
2009 HCJPL Sentry13242097-209841.4e-06-6.27-6.790JPL: "Analysis based on 79 observations spanning 9.2035 days (2009-Apr-17.23164 to 2009-Apr-26.43513)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

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 27 April '09

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

1901Noted that JPL Sentry has posted 2009 HE60 as an impact risk - see above
1734Grabbed MPEC 2009-H61 - 2009 HE60 - see above
Grabbed MPEC 2009-H62 - 2009 HF60 - see above
Grabbed MPEC 2009-H63 - 2009 HG60 - see above
1600Noted that NEODyS has updated its 2009 HU2 risk assessment - see above
1531Noted that NEODyS has updated its 2009 HD21 risk assessment - see above
Noted that NEODyS has posted 2009 HV58 as an impact risk - see above
1324Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that JPL Sentry has updated its 2009 HD21 risk assessment - see above
Noted that JPL Sentry has reposted 2009 HU2 as an impact risk - see above
Grabbed MPEC 2009-H60 - Daily Orbit Update - see above