Contents  on 10 May '11


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 10 May '11

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 2232 UTC when the database was dated 10 May

NEOCP Activity  on 10 May '11

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of ten listings on the NEOCP today.

New MPECs  on 10 May '11

Minor Planet Electronic Circulars

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

MPEC 2011-J43 - "23:48 UT" - 2010 HE79

MPEC 2011-J42 - "18:01 UT" - 2011 JB10

MPEC 2011-J41 - "11:12 UT" - 2011 JZ10

<< DOU on 10 May '11 >>  MPEC 2011-J40 - "07:09 UT" - Daily Orbit Update

MPEC 2011-J39 - "00:40 UT" - 2010 KX7

Observers  on 10 May '11

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-J40 -- 2011 EZ78
251Arecibo in Puerto Rico, 1 in radar -- 217796
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-J40 & 2011-J41 -- 2011 JZ10, 2011 HL7, 2011 HJ61
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-J40 -- 162474
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-J42 -- 2011 JB10
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2011-J40 & 2011-J41 -- 2011 JZ10, 2011 JD1, 2011 HJ61, 2011 GO27
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-J40 -- 2011 GL60
J95Great Shefford Obs. in England, 4 in MPECs 2011-J39, 2011-J40 & 2011-J42 -- 2011 JV10, 2011 JB10, 2011 HC24, 2010 KX7
A17Guidestar Obs. in Germany, 6 in MPEC 2011-J40 -- 2011 HT, 2011 HO, 2011 GQ65, 2004 GP, 263976, 163696
704LINEAR in New Mexico, 4 in MPEC 2011-J40 -- 2011 HP, 2010 VN65, 169675, 138359
304Las Campanas Obs. in Chile, 1 in MPEC 2011-J43 -- 2010 HE79
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-J41 & 2011-J42 -- 2011 JZ10, 2011 JB10
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2011-J40 -- 2007 RQ17, 86878, 65803, 31210, 159555
A24New Millennium Obs. in Italy, 11 in MPEC 2011-J40 -- 2010 WQ7, 2006 SV134, 89830, 274138, 260141, 23187, 198856, 144332, 141525, 8176, 4954
J69North Obs. in England, 1 in MPEC 2011-J40 -- 2010 TU5
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 2 in MPEC 2011-J40 -- 248590, 5496
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-J42 -- 2011 JB10
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-J42 -- 2011 JB10
510Siegen Obs. in Germany, 1 in MPEC 2011-J40 -- 2010 TU5
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-J41 -- 2011 JZ10
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2011-J40 & 2011-J41 -- 2011 JZ10, 2011 HJ7
H78Univ. of Narino Obs. in Colombia, 1 in MPEC 2011-J40 -- 164121
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-J40 -- 2011 HQ
198Wildberg Obs. in Germany, 1 in MPEC 2011-J42 -- 2011 JB10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 May '11

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
2011 HJ7JPL Sentry1451209423.2e-08-6.26-6.560JPL: "Analysis based on 32 observations spanning 12.956 days (2011-Apr-26.21907 to 2011-May-09.17508)." Diameter approximately 0.120 km. from mean, weighted H=22.2.

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 10 May '11

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

2359Grabbed MPEC 2011-J43 - 2010 HE79 - see above
2232Noted Radar Astrometry database update - see above
2131Noted that the NEOCP has become active
1806Grabbed MPEC 2011-J42 - 2011 JB10 - see above
1451Noted that JPL Sentry has updated its 2011 HJ7 risk assessment - see above
Grabbed MPEC 2011-J40 - Daily Orbit Update - see above
Grabbed MPEC 2011-J41 - 2011 JZ10 - see above
Noted that the NEOCP has become empty
0056Grabbed MPEC 2011-J39 - 2010 KX7 - see above