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IMAGES FROM THE GAS CCD TRAINING SESSIONS 2007

Written by John Evans, President, August 2007

All images Copyright Guildford Astronomical Society

These images were captured during the training sessions at Holmbury and, in most cases, represent the observer’s first experience of CCD imaging. They were taken with the Society’s SXV-H9 CCD camera and William Optics 80mm refractor piggy-back mounted on our 20.5 inch telescope at Holmbury.

Click on the images for a larger version of each.

NGC4565

NGC4565

NGC4565

NGC4565

M51

M51

M101

M101

The data from which the images are drawn is very limited indeed - most images are built from 6 to 8 individual exposures of only 30 seconds each. The camera is remarkably sensitive! In the case of the M51 image, data from two sessions was combined to produce a deeper, more satisfying image. By contrast, the image of M101 – a low surface brightness object – is relatively faint but still interesting. While this image was being taken through the 80mm telescope, the object itself - against a relatively bright sky background - was barely visible at the eyepiece of the 20.5 inch. The two colour images, of M13 and M82, are built from very sparse quantities of colour data obtained during the sessions. All the images were stacked and initially processed in MaxIm DL during the training sessions and subsequently given some basic processing in Photoshop.

M13

M13

M82

M82

M81

M81

M81

M81

Have you signed up yet to learn how to use the Society’s CCD equipment? As you can see, it is an astonishingly powerful medium taking you, in a matter of seconds, far beyond the visual capabilities of even a very big telescope. There is no mystery to the techniques involved. They are straightforward and easy to learn. Training and use of the equipment are completely free to all members of the Society.

M81 and M82

M81 and M82

M84 and M86 - part of the Virgo cluster

M84 and M86 - Part of the Virgo cluster of galaxies

M104 - the Sombrero galaxy

M104 - Sombrero galaxy

M104

M104

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Last updated September 2007