Castor

66Alp Gem

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Set at a northern declination of +31° within the constellation Gemini, Castor marks one head of the celestial twins beside brighter Pollux. Designated Alpha Geminorum, it is a white A-type star with a nearly neutral B–V index of 0.034 and shines at apparent magnitude 1.58. The star lies about 51 light-years away, and its absolute magnitude of 0.62 reflects an intrinsic brightness moderately above the Sun's. Although labelled Alpha, Castor is slightly fainter than Beta Pollux, an ordering fixed by tradition rather than brightness. Its high northern position keeps it prominent in the winter evening sky.

الخصائص الفيزيائية

النوع الطيفي A Class A — A-type (White)
مؤشر اللون (B−V) 0,034

الرصد

القدر الظاهري +1.58
القدر المطلق 0,62
المسافة 50.9 ly
الكوكبة Gemini

الموضع

المطلع المستقيم 7h 34,60m
الميل 31° 53,30′

Frequently Asked Questions

What type of star is Castor?
Castor is a Class A — A-type (White) star.
How far is Castor from Earth?
Castor is approximately 50.9 light-years from Earth.
Can you see Castor with the naked eye?
With an apparent magnitude of 1.58, Castor is visible to the naked eye.
What constellation is Castor in?
Castor is located in the constellation Gemini.