HST May 2007 image of Dawn destination, 4 Vesta 
Credit: NASA, ESA, L. McFadden & G. Bacon

Image from May 14th from the Hubble Space Telescope Wide Field Planetary Camera 2 showing the Dawn mission's first destination, arriving in 2011 to orbit Main Belt asteroid 4 Vesta (see misson news below). To get a better sense of surface features, the smallest of which here are 60 km. (37 miles) across, see a video with the 5.34-hour rotation, also shown as a montage. Credit: NASA, ESA, L. McFadden, and G. Bacon. Vesta's southern hemisphere, to the lower right, is shaped by an impact crater almost as wide as the asteroid's diameter.

Contents  on 27 June '07

WELCOME to A/CC's prototype daily news publication designed to be the viewing end of a planned autonomous 24-hour news service. The new tools and this publication format are working well enough now to share with readers. It is expected that this approach will require less time to maintain than our previous news and small asteroid pages, which were retired on May 14th. There's still more development ahead and there probably will be some glitches along the way, but this is what's needed to keep up with the increasing pace of minor-object news. The CRT page will be maintained separately for a little while longer, until all of this is working smoothly. And the CRT and small-asteroid ephemerides will be kept going.

Minor-Object News  on 27 June '07

Minor-Object Science  on 27 June '07

NEOCP Activity  on 27 June '07

The MPC's NEO Confirmation Page has 1 listing: 1 new

When last checked at 2033 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new listing. This was a "one nighter." So far Major News has counted a total of six objects listed on the NEOCP at some point today.

New MPECs  on 27 June '07

Minor Planet Electronic Circulars

As of last check at 2347 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-M47 - "11:55 UT" - 2007 ML24

<< DOU on 27 June '07 >>  MPEC 2007-M46 - "06:06 UT" - Daily Orbit Update

Observers  on 27 June '07

Nine observing facilities appear in today's MPECs.

235CAST Obs., 1 in MPEC 2007-M46 -- 2007 MB24
703Catalina Sky Survey in Arizona, 2 in MPEC 2007-M46 -- 2007 LR32, 86878
808El Leoncito Obs. in Argentina, 5 in MPEC 2007-M46 -- 2007 LF, 2000 UV16, 152895, 108519, 4341
704LINEAR in New Mexico, 3 in MPEC 2007-M46 -- 2007 MB24, 2007 MT20, 2005 NW44
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2007-M47 -- 2007 ML24
A24New Millennium Obs. in Italy, 6 in MPEC 2007-M46 -- 2007 CA19, 2006 VD13, 53435, 5626, 1866, 1627
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2007-M46 & 2007-M47 -- 2007 ML24, 2007 LD
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-M46 -- 2007 MK6
A55Vallemare di Borbona Obs. in Italy, 1 in MPEC 2007-M46 -- 2007 MB24

Impact Risk Monitoring  on 27 June '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2347 and JPL at 2348 UTC)
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2080.
For the latest official risk assessments, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2007 ML24JPL19092011-20711932.4e-06-2.12-2.440JPL: "Analysis based on 11 observations spanning 3.0256 days (2007-Jun-21.42934 to 2007-Jun-24.4549)." Diameter approximately 0.511 km. from mean, weighted H=19.1.
2007 MB24JPL12562034-2106356.1e-08-3.59-4.560JPL: "Analysis based on 55 observations spanning 2.6488 days (2007-Jun-24.32377 to 2007-Jun-26.97253)." Diameter approximately 0.710 km. from mean, weighted H=18.4.
NEODyS12562028-2089454.72e-08-3.63-4.520NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2007/06/24.325 to 2007/06/26.973."
2002 TX55NEODyS2033208911.86e-05-4.38-4.380NEODyS: "Based on 75 optical observations (of which 2 are rejected as outliers) from 2002/10/03.396 to 2002/10/29.396."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

For a list of all risk-rated objects recently in view, see our ephemerides page.

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from an 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" for more about all this.

Chronology  on 27 June '07

Times are UTC for when the items were noted by Major News.

2033Noted that NEODyS has updated its 2002 TX55 risk assessment - see above
1911Added link to news story, "June 23rd Dawn Journal"
Added link to news story, "How NASA's Dawn Spacecraft Will Explore Solar System's Origin"
1909Noted that JPL has posted 2007 ML24 as an impact risk - see above
1353Added MOS paper, "Interpretation of the near-IR spectra of the Kuiper Belt Object (136472) 2005 FY9" - see above
Added link to news story, "UCLA Professor Christopher Russell Leads NASA's Dawn Mission"
1256Noted that JPL has updated its 2007 MB24 risk assessment - see above
Noted that NEODyS has posted 2007 MB24 as an impact risk - see above
Grabbed MPEC 2007-M46 - Daily Orbit Update - see above
Grabbed MPEC 2007-M47 - 2007 ML24 - see above