Contents  on 22 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 22 April '10

The MPC's NEO Confirmation Page has 13 listings: 5 new, 8 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five new and eight updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of fifteen 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 22 April '10

Minor Planet Electronic Circulars

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

MPEC 2010-H42 - "17:06 UT" - 2009 RB4

MPEC 2010-H41 - "15:00 UT" - Comet C/2010 H4 (Scotti)

<< DOU on 22 Apr. '10 >>  MPEC 2010-H40 - "06:10 UT" - Daily Orbit Update

MPEC 2010-H39 - "00:27 UT" - 2010 FL

Observers  on 22 April '10

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2010-H40 & 2010-H41 -- 2010 HF, 2010 HC, 2010 HA, C/2010 H4, 2010 GZ6, 2010 GU21, 2010 GS7, 2010 GQ75, 2010 GL65, 2010 GK65, 2010 GH30, 2010 GE35, 2010 GD25, 2010 GA7, 2010 GA34, 2010 GA24, 2010 EK44
B09Capannoli Obs. in Italy, 1 in MPEC 2010-H40 -- 68359
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2010-H40 -- 2010 HF
J95Great Shefford Obs. in England, 3 in MPEC 2010-H40 -- 2010 HF, 2010 GO67, 2005 YU55
511Haute Provence Obs. in Germany, 4 in MPEC 2010-H40 -- 2010 GU6, 2010 GS7, 2010 GA24, 2010 DB34
240Herrenberg Obs. in Germany, 2 in MPEC 2010-H40 -- 141432, 3671
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2010-H40 & 2010-H41 -- C/2010 H4, 2010 GQ75, 2010 FH81
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2010-H39 -- 2010 FL
2614Andrew Lowe in Alberta using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2010-H42 -- 2009 RB4
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2010-H40 -- 2010 HG20
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPEC 2010-H40 -- 2010 HA, 2010 CC180, 154029, 142040, 1980, 1036
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2010-H40 & 2010-H41 -- C/2010 H4, 186822
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-H41 -- C/2010 H4
C51WISE in Earth polar orbit, 11 in MPEC 2010-H40 -- 2006 DS14, 2002 WP, 2001 XD, 66272, 27346, 162903, 159686, 144901, 138013, 7350, 3361
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 HG20JPL Sentry1342R E M O V E DJPL #2 for the day: Risk listing removed at 0952 UTC.
2005 YU55JPL Sentry1641R E M O V E DJPL: Risk listing removed at 1639 UTC.
NEODyS1342R E M O V E D-

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 '10

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

1726Grabbed MPEC 2010-H42 - 2009 RB4 - see above
1641Noted that JPL Sentry has removed 2005 YU55 as an impact risk - see above
1519Grabbed MPEC 2010-H41 - Comet C/2010 H4 (Scotti) - see above
1342Noted that NEODyS has removed 2005 YU55 as an impact risk - see above
Noted that JPL Sentry has removed 2010 HG20 as an impact risk - see above
Grabbed MPEC 2010-H40 - Daily Orbit Update - see above
0100Noted that JPL Sentry has posted 2010 HG20 as an impact risk - see above
Grabbed MPEC 2010-H39 - 2010 FL - see above