SAP - Jolimont Observatory

It has been a year since the Popular Astronomy Society acquired a CCD camera. This camera is a Hisis 22 (12bit dynamic), with an electronic shutter. After several false starts, we have made progress in mastering this marvelous tool, which we are using above all to take photos of the planets.

You will find here some of our most recent pictures. All comments are welcome!

The reflector we use has a 190 mm diameter lens. Unfortunately, the lens of this hundred-year-old instrument has not been corrected for color aberrations, which obliges us to use a strong green filter (Celestron #58 model) ... and very long exposure time :-(

Otherwise, since the objective has not had an antireflection treatment, we are unable to use a barlow (it generates phantom images).

We must therefore place the CCD directly in the focal plane of the telescope, at F/D=20, which does not correspond to optimum sampling (only 0,5 arcsec by pixels)

All pictures are taken from Center Town of Toulouse (A 500 000 inhabitants French town).

Copyright : No part of images or data files contained in this web site may be reproduced or transmitted in any form or by any means without the written permission of the owners.

Comments are welcome !