XMM-Newton Detects Water On Tempel 1

DEEP IMPACT

See animation sequence at ESA

Paris, France (ESA) Jul 05, 2005
Images taken by the Optical Monitor on board ESA's XMM-Newton observatory on 3 and 4 July 2005, show a comparison between the states of the comet before and just after impact.

The images were taken in the blue (top) and ultraviolet channels (bottom) of the instrument. The ultraviolet images show the emissions of hydroxyl ions, the direct decay product of water.

About 1.5 hours after the impact, the brightness of hydroxyl groups is increased by a factor of about five. Later, about 4.5 hours after the impact the ultraviolet emission is decreased again which indicates that the peak has passed.

The presence of water in Tempel 1 is consistent with preliminary measurements of the composition of the comet made last week by the ALICE instrument on ESA's Rosetta spacecraft.

DEEP IMPACT

Comet Impactor Hits Tempel 1
Pasadena CA (AFP) July 3, 2005

The first-ever projectile shot at a passing comet came up with a bullseye today when the impactor released by NASA's Deep Impact spacecraft hit comet Tempel-1. Image acquisition has been proceeding without incident and spectacular images will be available shortly. fullstory

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