Tuesday31 August 20049:05am MDT2004-08-31 UTC 1505

News briefs

Fred Whipple:  A note was sent to the Minor Planet Mailing list (MPML) yesterday from the Harvard-Smithsonian Center for Astrophysics (CfA) announcing that Fred Whipple died yesterday at age 97. Among other accomplishments in a career than shone like a comet, he was the discoverer of six comets, originated the “dirty snowball” comet concept, pioneered satellite tracking, and invented the Whipple shield used to protect spacecraft when flying through dust. See a CfA 28 June 2002 profile related to his part in the then coming but ultimately failed Contour comet mission. BBC has a report today.

Impact theory:  Southwest Research Institute has a news release dated 26 August (images) that appeared yesterday about “a theory

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for the ignition threshold for impact-generated fires,” saying that “impacts resulting in craters at least 85 kilometers wide can produce continental-scale fires, while impact craters more than 135 kilometers wide are needed to cause global-scale fires. . .  The Chicxulub impact event may have been the only known impact event to have caused wildfires around the globe. The Manicouagan (Canada) and Popigai (Russia) impact events, however, may have caused continental-scale fires.”



Risk monitoring Sunday 31 August tomorrow

The Monday Daily Orbit Update MPEC (DOU) had no observations of objects with impact solutions and there was no other risk monitoring news. The Tuesday DOU has two sets of 2004 QA22 observations from Great Shefford Observatory in England spanning both sides of midnight both last night and the night before. Today JPL removed its impact solutions for this object, which it estimates to be about 10 meters/yards wide.

Note: The editor, who is traveling, would like to thank Stu Megan for tracking changes in listings related to risk monitoring to help insure continuity in A/CC's reporting during this time.

Summary Risk Table - sources checked at 1206 UTC, 31 Aug

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 QB17 NEODyS 8/292020-20718-5.13-5.7302.739
JPL 8/292013-209712-4.71-5.0902.739
 2004 QA22JPL 8/31R E M O V E D
 2004 FU162JPL 8/242006-2104824-5.38-6.3700.031
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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