Saturday6 March 20044:11pm MST2004-03-06 UTC 2311 back top next  

The Asteroid/Comet Connection's
daily news journal about
asteroids, comets, and meteors


Today's issue status: done
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Cover: The 7 January 2000 occultation by 12.5-magnitude 423 Diotima of 11.5-magnitude star GSC 2470 00150 as recorded at Gnosca Observatory in Switzerland using the drift scan technique of leaving the telescope fixed. The exposure for 80 seconds records at center the shadow of this large Main Belt asteroid passing over the site, as illustrated in the Stefanik Observatory prediction. This image is ©Copyright Stefano Sposetti, used with permission. See also a before/after animation.

News briefs – part 1/1 Major News for 6 March 2004 back top next  
News briefs

Occultations:  The star shadow of 423 Diotima passed over Stefano Sposetti's observatory in the "cover" image above, but observers usually have to travel for occultations, spreading out to create "chords" at different geographical points that can reveal an asteroid's profile and size, as Richard Nugent explains and shows. To "fill in the observing fence," equipment may be run automatically or remotely at unattended sites, as David Dunham relates in a report about 1089 Tama's January 16th occultation

Main Belt news:  While helping follow-up another observatory's Main Belt discoveries on February 22nd, Peter Birtwhistle found that he had a field with seven moving objects, all of them known except one. And that was how Great Shefford Observatory came to make its fourth discovery, as he tells on his 2004 DN25 page. It has some nice illustration work that also shows what happens when a star visible to the naked eye (delta Cancri, the star at the center of Cancer) appears in a frame exposed to detect faint asteroids.

Sudbury Crater, the subtle ellipse in this side-looking radar image, itself took a later hit that formed Wanapitei Lake, seen at right. Image courtesy of NASA. SIR-B radar image of
Sudbury & Wanapitei craters

Miner objects:  A Planetary and Terrestrial Mining Sciences Symposium (PTMSS) will be held 9-11 June at the Northern Centre for Advanced Technology (NORCAT) in Sudbury, Ontario.

The purpose . . . is to promote a closer relationship between the space and mining sectors [with topics on] the science and technology of exploring and exploiting resources on Earth as well as on other planetary bodies, such as the moon, Mars, asteroids, comets, etc.

Sudbury is at the world's second largest known impact structure, where an extraordinarily rich deposit of copper and nickel has been mined since the late 1800s (learn more). A recent BBC article told of similar mining associations with impact sites.

Risk monitoring - part 1/1 Major News for 6 March 2004 back top next  
Risk monitoring 6 March

The Saturday Daily Orbit Update MPEC, which appeared later than usual today, has observation of 2004 DC from Siding Spring Observatory in Australia from Thursday, and NEODyS has now eliminated its impact solutions for this object.


Update:  On a Saturday afternoon in Pasadena, JPL joined NEODyS in removing 2004 DC.

Summary Risk Table - sources checked at 2301 UTC, 6 Mar

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 DCJPL 3/6R E M O V E D
NEODyS 3/6R E M O V E D
VI = count of "virtual impactors" (impact solutions)
See A/CC's Consolidated Risk Tables for more and maybe
  newer details, and check the monitors' links for latest info.
Note that only objects recently in view are shown here.
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