[meteorite-list] Deep Impact Update - May 13, 2005

[Ron Baalke]

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
http://www.jpl.nasa.gov

D.C. Agle  (818) 393-9011
Jet Propulsion Laboratory, Pasadena, Calif.

Dolores Beasley/Erica Hupp (202) 358-1753/1237
NASA Headquarters, Washington

News Release: 2005-075                        May 13, 2005

Deep Impact Mission Status Report

Fifty-nine days before going head-to-head with comet Tempel 1, NASA's Deep Impact spacecraft 
successfully executed the second trajectory correction maneuver of the mission.
The burn further refined the spacecraft's trajectory, or flight path, and also moved forward the 
expected time of the Independence Day comet encounter so impact would be visible by ground- and 
space-based observatories.
  
The 95-second burn - the longest remaining firing of the spacecraft's motors prior to comet 
encounter -- was executed on May 4. It changed Deep Impact's speed by 18.2 kilometers per hour 
(11.3 miles per hour). 

"Spacecraft performance has been excellent, and this burn was no different," said Rick Grammier, 
Deep Impact project manager at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "It was a 
textbook maneuver that placed us right on the money."

Right on the money is where Deep Impact has to be to place a 1-meter-long (39-inch) impactor 
spacecraft in the path of a comet about as big as the island of Manhattan that is bearing down on it at 
37,100 kilometers per hour (6.3 miles per second). At the same time, from a very comet-intimate 
distance of 500 kilometers (310 miles), a flyby spacecraft will be monitoring the event. This all 
occurs in the wee hours of July 4 - at 1:52 am Eastern time (July 3, 10:52 p.m. Pacific time) -- at a 
distance of 133.6-million kilometers (83-million miles) from Earth.

"With this maneuver our friends working the Hubble Space Telescope are assured a ringside seat," 
said Deep Impact Principal Investigator Dr. Michael A'Hearn of the University of Maryland, College 
Park. "Their observations, along with space telescopes Chandra and Spitzer and numerous ground-
based observatories, will provide us with the most scientific bang for our buck with Deep Impact."

Deep Impact is comprised of two parts, a "flyby" spacecraft and a smaller "impactor."  The impactor 
will be released into the comet's path before a planned high-speed collision on July 4. The crater 
produced by the impact could range in size from the width of a large house up to the size of a football 
stadium, and from 2 to 14 stories deep. Ice and dust debris will be ejected from the crater, revealing 
the material beneath.

The Deep Impact spacecraft has four data collectors to observe the effects of the collision. A camera 
and infrared spectrometer, which comprise the High Resolution Instrument, are carried on the flyby 
spacecraft, along with a Medium Resolution Instrument.  A duplicate of the Medium Resolution 
Instrument on the impactor will record the vehicle's final moments before it is run over by comet 
Tempel 1 at a speed of about 37,100 kilometers per hour (23,000 miles per hour). 

The overall Deep Impact mission management for this Discovery class program is conducted by the 
University of Maryland in College Park, Md. Deep Impact project management is handled by JPL. 
The spacecraft was built for NASA by Ball Aerospace & Technologies Corporation, Boulder, Colo. 
For more information about Deep Impact on the Internet, visit http://www.nasa.gov/deepimpact .For 
more information about NASA on the Internet, visit http://www.nasa.gov .