Wednesday20 October 200411:46am MDT2004-10-20 UTC 1746 last
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News briefs

New Horizons:  NASA Watch reported yesterday that the multi-purpose camera/spectrometer under construction for the New Horizons mission to Pluto and beyond “is now a number of months late and has significant cost problems,” and that an effort by the mission to take development away from Ball Aerospace is “reportedly” being thwarted by the company. See January news about this instrument, which is called “Ralph.”

Crater news:  NASA's Astrobiology Magazine has an article today about the possibility that there was more than one major impact during the Cretaceous-Tertiary extinction period 65 million years ago, citing specifically the Ukranian Boltysh impact structure (see a Sky & Telescope 13 September 2002 article). Not mentioned is the North Sea Silverpit structure (see National Geographic 31 July 2002 and U.K. Geological Society 1 August 2002 reports), which has dating estimated closer to the K/T boundary than Boltysh, but its identification as an

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impact structure was questioned earlier this year (UKGS 19 March 2004 report).

Risk monitoring - panel 1/1 Major News for 20 Oct. 2004 previous
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Risk monitoring yesterday 20 Oct. tomorrow

The Wednesday Daily Orbit Update MPEC has observation of 2004 UE from yesterday morning from LINEAR in New Mexico. Today NEODyS removed its two impact solutions, while JPL slightly lowered its overall risk assessment for this object.

Summary Risk Table - sources checked at 1744 UTC, 20 Oct

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 UENEODyS 10/20R E M O V E D
JPL 10/202027-21002-5.70-5.8103.156
 2004 TD18JPL 10/182093-21037-5.96-6.2404.071
 2004 RQ252 NEODyS 10/132017-20171-6.92-6.92022.778
JPL 10/3R 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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