Monthly archives: January, 2017

M42 Great nebula in Orion

I don’t want to repeat myself, therefore the description on the most famous nebula visible from northern hemisphere can be found here.

The previous picture has some strange halo around the bright Hatsya star and I was thinking why. Recently similar picture came out of my telescope and I realized that this strange halo is caused by the frost on the secondary mirror. I manufacture home-made dew shield and I don’t have these problems anymore.

This picture is, as usual, composed out of narrow band pictures. When I look at it I am still not happy, therefore I hope next year will be better weather and I will make a better picture.


M1 Crab nebula

It all started here. Crab nebula is the first catalogued deep space object. Charles Messier was searching for the comet (1758) but discovered his first deep space object. Crab nebula, also called Messier 1, is a supernova remnant – something like Veil nebula, but it’s much further from the Solar system – 6500 light years.

My first picture was made with pinched mirror, therefore I waited two years and captured it properly. Since I live in light polluted area, I chose narrow band filters, in order to get better contrast and composed this picture out of hydrogen alpha (red channel) and OIII (green and blue channel) narrow band pictures.