Contents  on 21 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.

Radar Astrometry  on 21 April '10

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2359 UTC when the database was dated 21 April

NEOCP Activity  on 21 April '10

The MPC's NEO Confirmation Page has 15 listings: 8 new, 7 updated

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

New MPECs  on 21 April '10

Minor Planet Electronic Circulars

There were five MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2010-H38 - "22:02 UT" - 2010 HG20

MPEC 2010-H37 - "18:18 UT" - Comet C/2010 H3 (SOHO)

MPEC 2010-H36 - "17:20 UT" - 2010 EC135

MPEC 2010-H35 - "14:06 UT" - Comet C/2010 H1 (Garradd)

<< DOU on 21 Apr. '10 >>  MPEC 2010-H34 - "06:13 UT" - Daily Orbit Update

Observers  on 21 April '10

A total of 23 observing facilities appeared in this day's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2005 YU55
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2010-H35 & 2010-H38 -- 2010 HG20, C/2010 H1
B75Betelgeuse Station in Italy, 2 in MPEC 2010-H34 -- 2010 GU21, 2010 CM44
703Catalina Sky Survey in Arizona, 1 in MPEC 2010-H36 -- 2010 EC135
A77Chante-Perdrix Obs. in France, 1 in MPEC 2010-H36 -- 2010 EC135
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2010-H36 -- 2010 EC135
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2010-H34 -- 2010 GU21, 2010 GA24
B23Fiamene Obs. in Italy, 3 in MPEC 2010-H34 -- 2010 DB34, 2009 UY19, 2006 CX10
372Geisei Obs. in Japan, 1 in MPEC 2010-H35 -- C/2010 H1
J95Great Shefford Obs. in England, 2 in MPEC 2010-H34 -- 2010 GE35, 2009 JO2
511Haute Provence Obs. in Germany, 8 in MPEC 2010-H34 -- 2010 GU21, 2010 GR75, 2010 GO33, 2010 GE35, 2010 GA34, 2010 FQ, 2010 FF10, 2010 FA81
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2010-H38 -- 2010 HG20
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2010-H34 & 2010-H38 -- 2010 HG20, 2005 SC71, 2002 VD118, 2000 AD205, 162463, 154229
473Remanzacco Obs. in Italy, 1 in MPEC 2010-H38 -- 2010 HG20
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2010-H34 & 2010-H35 -- 2010 HA, C/2010 H1, 2010 EF21
2492LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2010-H37 -- C/2010 H3
2493LASCO Coronagraph 3 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2010-H37 -- C/2010 H3
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2010-H34 -- 2006 HY51, 2001 HC, 163001
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2010-H34 -- 2010 HF, 2010 GZ33, 2010 GX62, 2010 GK65, 2010 EQ43, 2010 EH20, 2001 UW17
926Tenagra II Obs. in Arizona, 9 in MPEC 2010-H34 -- 2010 HF, 2010 HC, 2010 HA, 2010 GZ5, 2010 GP33, 2010 GO67, 2010 GN67, 2010 GK65, 2010 GJ65
H53Thompsonville Obs. in Illinois, 2 in MPEC 2010-H34 -- 218863, 3554
H83Timberlake Obs. in Virginia, 1 in MPEC 2010-H34 -- 2010 GS7
A48Verona Obs. in Italy, 2 in MPEC 2010-H34 -- 2010 GU21, 2010 GA24
C51WISE in Earth polar orbit, 6 in MPEC 2010-H34 -- 2010 FL, 90367, 21088, 162463, 152679, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 GX62JPL Sentry1331R E M O V E DJPL: Risk listing removed at 0950 UTC.

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 21 April '10

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

2359Grabbed MPEC 2010-H38 - 2010 HG20 - see above
Noted Radar Astrometry database update - see above
1837Grabbed MPEC 2010-H37 - Comet C/2010 H3 (SOHO) - see above
1741Grabbed MPEC 2010-H36 - 2010 EC135 - see above
1434Grabbed MPEC 2010-H35 - Comet C/2010 H1 (Garradd) - see above
1331Noted that JPL Sentry has removed 2010 GX62 as an impact risk - see above
Grabbed MPEC 2010-H34 - Daily Orbit Update - see above