Castor - Gemini

Introduction | Map | My Own Observations | References

On this page I collect my observations of the double star Castor in the constellation Gemini / Twins.

 

Introduction

The double star Castor (alpha Geminorum) in the constellation Gemini / Twins is the Northern "twin" star of Pollux. It is a bit fainter than the latter, but nevertheless called alpha Geminorum - and a double star (Pollux is a simple star). I need a magnification of about 100 x to separate the double star (4.9"), but even then both stars are still very close together in the field of view (50 x was possible but hard to see).

Distance: 4.9" (Stoyan)
Distance: 52 light years (Stoyan)
Ranking: *** (Stoyan)

 

Map

Castor in the constellation Gemini in May and M 35 at the other end of the constellation

 

My Own Observations

 

References

On this Site