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Particles and comet tails...

6 October 2005

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Over more than 17 years of observations above and below the poles of the Sun, the ESA/NASA Ulysses mission has made fundamental contributions to our understanding of the Sun itself, its sphere of influence (the heliosphere), and our local interstellar neighbourhood. The mission provided the first-ever map of the heliosphere in the four dimensions of space and time.

Ulysses was launched by Space Shuttle Discovery in October 1990. It headed out to Jupiter, arriving in February 1992 for the gravity-assist manoeuvre that swung the craft into its unique solar orbit. It orbited the Sun three times and performed six polar passes. The mission concludes on 1 July 2008.

Credits: ESA (image by D. Hardy)

How far can a comet tail reach?

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True-colour (LRGB) image of Comet C/2002 V1 (NEAT), obtained on 29 January 2003 (18h44-18h57UT) with 60-cm, f/3.3 Deltagraph telescope, photometric filters and CCD. Image is a composite of 3x60s B, 3x60s V and 3x60s R images added together. The light image (L) was made by adding all 9 images. Image scale is 2.49 arc sec/pixel.

Credits: B. Dintinjana and J. Skvarc

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