3.67
Apparent Mag303
Distance (ly)A0III
Spectral Type10,100
Temperature (K)Thuban was the pole star when the ancient Egyptian pyramids were built, around 2700 BCE. It is now far from the celestial pole due to precession.
Stellar Data
Apparent Magnitude3.67
Absolute Magnitude-1.2
Distance303 light-years
Spectral TypeA0III
Temperature10,100 K
Luminosity300 L☉
Radius3.4 R☉
Mass3.4 M☉
Right Ascension14h 04m 23.3s
Declination+64° 22′ 33.1″
ConstellationDraco
Notable Facts
- Thuban was the North Star around 2700 BCE
- The Great Pyramid of Giza had a passage aligned to Thuban
- It is an eclipsing binary discovered in 2020