Sunspot observations April 2011

In April, I made sunspot observations allways when possible. In total, I managed to make observations in 10/30 days. I made my observations in Sodankylä, Northern Finland with my new 102/1000mm refractor. I wasn't able to see any naked eye sunspots in April. The mean sunspot number in April 2011 according to my observations is …

Do it yourself -solar filter

When I purchased my new telescope, I also bought a sheet of Baader Astrosolar film for solar observations. I made a cheap and easy solar filter out of Astrosolar film and cardboard. In this post, I will show how to do a similar solar filter by yourself! For making a solar filter like this you …

A new telescope

I had long been thinking to buy a telescope suitable for observing the objects of our Solar system. I had several different possibilities in my mind, but after all I decided to invest 500 € in Celestron Omni XLT 102, which is a achromat refractor with 102mm lens and focal ratio 9,8 and with CG …

Report from Tähtipäivät 2011

Tähtipäivät -amateur astronomy event was organized in Turku by Turun Ursa. The event site was at the University of Turku. In the event, there were lectures aimed to great audience given for example by Jari Mäkinen (science author), Hannu Karttunen (astronomer) and Marianna Ridderstad (archeoastronomer). There was also a fair -type area, where different kinds …