Concepts in Astronomy #21. Finding Planets, Stars and Constellations: Gemini, including Pollux and Castor
Finding Stars and Constellations: Gemini, including Pollux and Castor
In order to find the constellation of Gemini, we need to draw a line from Rigel to Betelgeuse in the constellation of Orion and continue it for about 1.5 times the distance between those 2 stars. This will takes to the vicinity of Pollux and Castor, the 2 most brilliant starts in the constellation of Gemini.
Pollux (Beta Geminorum) is a star which has 8.8 times the radius of the Sun. It is located 33.7 light years from Earth.
Castor (Alpha Geminorum) is actually a system of 6 stars. It is located 51 light years from Earth.
Previous Posts
Concepts in Astronomy #1. Introduction
Concepts in Astronomy #2. The Ecliptic
Concepts in Astronomy #3. The Celestial Equator
Concepts in Astronomy #4. Right Ascension
Concepts in Astronomy #5. Declination
Concepts in Astronomy #6. The Celestial Sphere
Concepts in Astronomy #7. Azimuth
Concepts in Astronomy #8. Altitude
Concepts in Astronomy #9. The Equatorial Coordinate System
Concepts in Astronomy #10. The Topocentric Coordinate System
Concepts in Astronomy #11. Equinox
Concepts in Astronomy #12. Solstice
Concepts in Astronomy #13. Rotation Period
Concepts in Astronomy #14. Orbital Period
Concepts in Astronomy #15. Axial Precession
Concepts in Astronomy #16. Axial Tilt
Concepts in Astronomy #17. Finding Planets, Stars and Constellations: Polaris
Concepts in Astronomy #18. Finding Planets, Stars and Constellations: Ursa Major and the Big Dipper
Concepts in Astronomy #19. Finding Planets, Stars and Constellations: Orion
Concepts in Astronomy #20. Finding Planets, Stars and Constellations: Sirius