Contents  on 26 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 26 April '10

The MPC's NEO Confirmation Page has 11 listings: 6 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six new and five updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of sixteen 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 26 April '10

Minor Planet Electronic Circulars

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

MPEC 2010-H65 - "16:24 UT" - 2010 HW20

MPEC 2010-H64 - "16:10 UT" - 2010 HV20

<< DOU on 26 Apr. '10 >>  MPEC 2010-H63 - "06:12 UT" - Daily Orbit Update

Observers  on 26 April '10

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2010-H63 -- 2010 GU21, 85839
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2010-H63 -- 2000 HD74
448Desert Moon Obs. in New Mexico, 5 in MPEC 2010-H63 -- 2010 GT7, 2010 GR75, 2010 GO33, 2010 EV45, 2005 GB120
J95Great Shefford Obs. in England, 1 in MPEC 2010-H63 -- 2010 GE35
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2010-H63, 2010-H64 & 2010-H65 -- 2010 HW20, 2010 HV20, 2010 FH81
118Modra Obs. in Slovakia, 1 in MPEC 2010-H64 -- 2010 HV20
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2010-H63, 2010-H64 & 2010-H65 -- 2010 HW20, 2010 HV20, 2010 HG20
H11Rodeo Obs. in New Mexico, 3 in MPECs 2010-H63 & 2010-H64 -- 2010 HV20, 2010 GT7, 2010 GR75
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2010-H63 -- 2010 GW62, 2010 GR75, 2010 FA81, 218017
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-H63 -- 2010 HG20
926Tenagra II Obs. in Arizona, 6 in MPECs 2010-H63 & 2010-H64 -- 2010 HV20, 2010 HG20, 2010 HF, 2010 GW62, 2010 GR75, 2009 JO2
G56Walnut Creek Obs. in northern California, 1 in MPEC 2010-H63 -- 2010 GS7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 April '10

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. 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 HV20JPL Sentry18302092-210631.7e-08-6.14-6.260JPL: "Analysis based on 42 observations spanning 1.1078 days (2010-Apr-25.36474 to 2010-Apr-26.47256)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
2010 HS20NEODyS13402017-2089823.85e-06-4.54-5.030NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2010/04/20.420 to 2010/04/25.488."

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 26 April '10

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

1830Noted that JPL Sentry has posted 2010 HV20 as an impact risk - see above
1632Grabbed MPEC 2010-H64 - 2010 HV20 - see above
Grabbed MPEC 2010-H65 - 2010 HW20 - see above
1340Noted that NEODyS has posted 2010 HS20 as an impact risk - see above
Grabbed MPEC 2010-H63 - Daily Orbit Update - see above