Recently an image of M33 was posted on this site made by Michael van Doorn and myself. By searching for some papers on the internet I was able to find databases giving the coordinates of red and yellow hypergiants, post-red hypergiants (supernova progenitors), variable stars and globular clusters in M33. With pixinsight I overlaid these …
Recently I found that the images taken for the Digitized Sky Survey around 1990 are about the same image scale as the images I take now with my TEC-140. So I decided to make a comparison between an image from 1990 and 2013 of NGC 7331 and Stephan’s quintet. It clearly shows the stars are …
Here is a nice image comparison of 1990 Digital Sky Survey data and my image of 16th August 2013: Here an animation is shown of the same area before and after the nova:
A new nova was discovered in the constellation of Delphinus on August 14 18:00 UT. I was able to start imaging within 5 hours of the discovery and gather some nice brightness measurements. Here my latest estimations can be found: The nova is still brightening and now visible with the naked eye. Here is an …
Recently I have started with observing variable stars. For this I have been measuring v363 cas and its surroundings. In this area four/five nice variables were visible in my field of view. Here is an overview of the generated lightcurves together with the estimates from the AAVSO database….
Shown here is a lightcurve measured of a binary star system transiting each other during a rotation period.