Tuesday6 July 20046:04pm MDT2004-07-07 UTC 0004 back top next  

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

Today's issue status: done

yesterdayJulytomorrowIndex

Cover: During observation 5-7 July 2000 with the Hubble Space Telescope, comet C/1999 S4 brightened radically four years ago today (lower right image) and then “blew its top” on the 7th (enlarged image). A piece of the nucleus “possibly house-size” is seen “roughly 290 miles (470 km) from the nucleus and appears to be moving down the tail at about 6 miles per hour.” There was further disruption over the next few weeks, as shown in previous cover images (Index). See an HST news release and Science@NASA article.

Credits: NASA, H. Weaver & P. Feldman (Johns Hopkins U.), M. A'Hearn (U. of Maryland), C. Arpigny (Liege U.), M. Combi (U. of Michigan), M. Festou (Obs. Midi-Pyrenees), & G.-P. Tozzi (Arcetri Obs.)
News briefs – panel 1/1 Major News for 6 July 2004 back top next  
News briefs

Meteor news:  Overnight the Seattle Post-Intelligencer posted an article dated today telling about the meteorite-collecting Hupe brothers and the search by reportedly three teams for remnants of the June 3rd Washington state bolide (Index). And it quotes Rob Matson about his team's efforts. (See “cover” images yesterday and earlier for examples of Rob Matson's successful meteorite searching, albeit in terrains vastly simpler than where pieces may have fallen in Washington.)

Jim Gamble in El Paso, Texas reports a bright meteor caught heading almost due north overhead by his all-sky camera at 1:28am July 5th that he “nearly discarded as local fireworks,” but it “Just looked a bit too much like the real thing, so I sent it to Sandia for verification.” The Sandia National Labs all-sky camera in Albuquerque, New Mexico caught this meteor also, seen falling low on the southern horizon in a movie they have posted (590Kb).

Bits & pieces:  For updates on the two fires (the “Nutall complex”) threatening the Mt. Graham International Observatory in Arizona (see yesterday and “Bits & pieces” June 28th), there are AP wire stories at the Flagstaff Daily Sun “Fire watch” today and CNN today. And Sky & Telescope has a report from yesterday.

The Houston Business Journal has a long article posted yesterday from its July 2nd print edition about the implementation of a Fort Bend County light pollution ordinance designed to protect George Observatory, with a focus on how this affects an overlit nearby power plant.

The Rosetta comet mission has a brief status report from yesterday for the week of 25 June to 2 July, noting that “The spacecraft is configured for quiet cruise and the payload is off,” although some unplanned work was done to help investigate an anomaly with two of the reaction wheels, which are used to control orientation.

Risk monitoring - panel 1/1 Major News for 6 July 2004 back top next  
Risk monitoring 6 July

The Tuesday Daily Orbit Update MPEC has observation of 2004 MP7 from Goodricke-Pigott Observatory in Arizona yesterday morning. Today JPL slightly raised its low risk assessment for a single impact solution in 2087, beyond the NEODyS time horizon.

Summary Risk Table - sources checked at 0000 UTC, 7 Jul

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 MP7JPL 7/62087-20871-3.98-3.9809.001
NEODyS 7/1R E M O V E D
 2004 MO7 NEODyS 6/302012-208067-4.34-5.2003.869
JPL 6/302016-208811-4.83-5.4803.869
 2004 ME6JPL 6/282017-209943-5.64-6.3500.873
 NEODyS 6/272044-20637-7.29-7.7600.873
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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