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Loading contentTheta Cassiopeiae is a main-sequence star in the constellation Cassiopeia (Cassiopeiae), lying about 133.56 light-years from Earth.
Class A. White stars with strong hydrogen lines. Many of the brightest stars in the sky are class A. Such stars have surface temperatures around 7,500–10,000 K and appear white to the eye.
| Spectral type | A7Vvar |
| Luminosity class | V |
| Apparent magnitude | 4.34 |
| Absolute magnitude | 1.28 |
| Luminosity (Sun = 1) | 26.816 |
| Colour index (B−V) | 0.17 |
| Distance | 133.56 ly (40.95 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
A main-sequence star fuses hydrogen into helium in its core. It will remain on the main sequence for most of its life before evolving into a giant.
Facts on this topic will be cited from these primary and reference sources.
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
High-precision parallax, magnitude, and position for ~118,000 stars.