M1 Crab HORGB crop

M1 Crab nebula - born in 1054

M1 Crab nebula - first item in the Charles Messier catalogue. Messier was a comet hunter who created catalogue of fuzzy objects in the sky, so they…


M1 Crab RGB

RGB filters - equally or fairly

This is not yet another entry about RGB color calibration :)  This is about something, that is lurking deeper in the dark when you perform RGB…


REDUC for double stars

Reduc description Not so long time ago I made an entry about measuring double stars with AstroImageJ software. Then I found out about dedicated…


Colour camera versus mono - price of comfort

Pretty many of astroimaging amateurs at some point need to choose between colour (OSC - One Shot Colour) or monochrome camera. This choice is not…


Measuring doubles

Astrometry with CCD (or CMOS) cameras can be very useful tool for measuring separation and position angle of double and multiple stars. When…


(367) Amicitia

Amicitia is typical main belt asteroid. It orbits the Sun during 3 years and 112 days in average distance of 2.22 astronomical units (about 340 mln…


1321 Majuba photometry

(1321) Majuba is one of very many asteroids in the Solar System. It orbits around Sun with the period of 5 years and 21 days in the average distance…


ACF 10" and CCDT67 telecompressor

It has already been some time from first light of Meade ACF telescope and I was looking forward a clear night. And it happened, a few days after…


Meade ACF first light

After about a week from a moment my new Meade ACF tube was installed on the pier I had a chance for first light. I was not completely prepared for…