Thursday, 15 November 2012

Seven Sisters and a Black Eye

M45, The Pleiades, The Seven Sisters. This open star cluster lies in the constellation of Taurus. It has a radius of about 8 light years and a distance of about 43 light years. The biggest challenge was capturing the surrounding nebulosity (Merope's nebula) . A ten inch, f/4.8 reflector was used unguided. The sub frames were 60s exposures . The total exposure times were ten minutes using a red filter, ten minutes using a green filter and sixty minutes using a blue filter:

 

M64. NGC4826, The Black Eye galaxy. This spiral galaxy lies in the constellation of Coma
Berenices at a distance of 40 million light years. A ten inch, f/4.8 reflector with PHD
auto guiding was used. The exposure times were thirty five minutes for each RGB colour
filter using five minute sub frames and matching dark frames: