A few months ago, I decided to create a list of variable stars observable with my binoculars from city. I started with downloading data for variable stars reaching at least 7.5 magnitude brightness from VSX variable star catalog as explained here. After downloading the data, i filtered out supernovae and novae except recurrent novae. Then removed variable stars with magnitude change less than 0.4. Afterwards i excluded all stars without "V" or photographic magnitude data. Finally i removed suspected variables.
The resulting list can be found here.
The list contains data for 638 variable stars and i hope it helps you to find variable stars to observe.
Saturday, February 18, 2012
Sunday, February 12, 2012
Baader Astro Solar Filter
2 weeks ago, I ordered Baader Astro Solar Film from Baader Planetarium. My main purpose was to observe Venus transit on 5-6th June 2012. It arrived as a A4 size sheet of solar filter placed in a hard envelope. I built the filter as explained here but the resulting filter looked rudimentary because of my lack of hand skill. Next morning i could not wait to take trial shots with the filter and found out that although the filter does not look promising, the image quality was nice. For example, following picture was taken on 11th February 2012 morning and you can see 2 close sunspot sharing same sunspot number.
The sunspots seen on the picture are smaller than Venus' size during transit so it seems that i can take Venus transit shots with this filter if weather permits. This year Sun is quite active so i wish i can take better sunspot shots this year.
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| Sony DSC-H1, fl:432mm (35mm equivalent), f/5.6, 1/500s, ISO 64, ND5 Solar filter |
The sunspots seen on the picture are smaller than Venus' size during transit so it seems that i can take Venus transit shots with this filter if weather permits. This year Sun is quite active so i wish i can take better sunspot shots this year.
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