4 Vesta from Dawn on June 1st. 

The Dawn spacecraft was reported yesterday to be getting close enough to 4 Vesta to obtain imagery "approaching the resolution of the best Hubble Space Telescope images." This frame is from June 1st, credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA.

Contents  on 14 June '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.

NEOCP Activity  on 14 June '11

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 89 listings on the NEOCP 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 14 June '11

Minor Planet Electronic Circulars

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

MPEC 2011-L56 - "18:54 UT" - 2011 KP36

<< DOU on 14 June '11 >>  MPEC 2011-L55 - "07:08 UT" - Daily Orbit Update

MPEC 2011-L54 - "03:39 UT" - 2011 LJ20

Observers  on 14 June '11

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2011-L55 -- 2011 LX10, 2007 LQ19, 163696, 3103
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2011-L54, 2011-L55 & 2011-L56 -- 2011 LL2, 2011 LJ20, 2011 KP36, 2011 FY2, 2011 BO59, 2011 BJ2, 2010 SO16, 2009 AH16, 2001 OA14, 1991 TF3
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-L54 -- 2011 LJ20
J95Great Shefford Obs. in England, 3 in MPECs 2011-L54, 2011-L55 & 2011-L56 -- 2011 LT17, 2011 LJ20, 2011 KP36
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-L56 -- 2011 KP36
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-L54, 2011-L55 & 2011-L56 -- 2011 LJ20, 2011 KP36, 2011 JK, 1998 KH9, 7341
A24New Millennium Obs. in Italy, 13 in MPEC 2011-L55 -- 2011 KN9, 2011 JP29, 2011 GQ65, 2004 JO2, 68348, 37336, 275714, 263976, 163250, 7482, 3288, 1917, 1866
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-L56 -- 2011 KP36
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-L55 -- 2011 LL2
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-L54 -- 2011 LJ20
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-L56 -- 2011 KP36
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2011-L56 -- 2011 KP36
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-L55 -- 3288
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-L55 -- 2008 VH
H47Vicksburg Obs. in Mississippi, 2 in MPEC 2011-L55 -- 2011 FB29, 2011 EZ78
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 June '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 risk pages.





Notes for Today's Latest Risk Assessments
2011 LT17JPL Sentry15552072-211061.7e-06-4.17-4.310JPL: "Analysis based on 60 observations spanning 4.7073 days (2011-Jun-09.33984 to 2011-Jun-14.047092)." Diameter approximately 0.170 km. from mean, weighted H=21.5.
2011 AG5JPL Sentry21022040-204756.1e-04-1.53-1.541JPL: "Analysis based on 139 observations spanning 154.18 days (2011-Jan-08.2673 to 2011-Jun-11.44956)." Diameter approximately 0.140 km. from mean, weighted H=21.9.

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 14 June '11

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

2102Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
1903Grabbed MPEC 2011-L56 - 2011 KP36 - see above
1555Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Grabbed MPEC 2011-L55 - Daily Orbit Update - see above
0431Grabbed MPEC 2011-L54 - 2011 LJ20 - see above