Alpha Geminorum (Castor A)
Alpha Geminorum (α Gem), also known as Castor A, is a spectral class A2Vm star of magnitude 1.9 located in the constellation Gemini. α Gem is one of the brighter stars in Gemini and can be seen by the naked eye under dark skies or with binoculars.
- Name:
- Alpha Geminorum
 
- Short name:
- α Gem
 
- Common name:
- Castor A
 
- Spectral class:
- A2Vm
 
- Magnitude:
- 1.9
 
- Right Acension:
- 07h 34m 36.00s
 
- Declination:
- +31° 53' 19.1"
 
- Constellation:
- Gemini
 

