Observing double and multiple stars, my favorite 20

Hi all,

During the last few years I “re-discovered” a group of objects
that is not as badly affected by light- and air pollution as other
deepsky objects: double and multiple stars. I always have been
a visual observer of the deepsky, and I just love these little
gems for their aesthetic beauty. So I decided to write down my
personal top 20 of double and multiple stars (until now), including
basic data (constellation, magnitude of all components, separation,
position angle, the RA/DEC some background information,
what to expect at the telescope and or binoculars, and of course
finder charts for all 20 stars.

I present my 20 favorite double stars in five consecutive articles,
for every time of the year a separate one, starting with early
spring constellations and ending with the winter constellations.
The articles will be published in this blog within the next 6 weeks,
starting with the first one today! You can find the first article
following this link:

http://www.backyard-astro.com/blog/index.php

So if you are interested in observing some wonderful double and
multiple stars, hop in every now and again to read or print out the
articles. With the first article, you can start observing double and
multiple stars tonight. Clear skies to all of you!

Math