Spectral type

The term spectral type in astronomy referred to the stellar magnitude of a star based on its temperature and color. Among the spectral types were the O-type star, F-type star, and G-type star.
The sun in the Sigma Draconis system was classified with a spectral type of Gamma 9. ()
== Appendices ==
=== Background information ===
The traditional scientific classification scheme, called the Harvard system, from hottest to coolest stars is:
* O-type star (blue in color) – Mintaka A, Idran B and C
* B-type star (blue white to deep blue white) – Rigel
* A-type star (white to blue white) – Idran A, Vega, Sirius A
* F-type star (yellow white to white) – Orellius Minor, Canopus, Procyon A
* G-type star (yellow to yellowish white) – Calindra, Hemikek, Sol
* K-type star (orange) – Alpha Centauri B, Aldebaran, 40 Eridani A
* M-type star (orange red) – Proxima Centauri, Betelgeuse, 40 Eridani C
It is unknown to which of those spectral types a "Gamma 9" could belong to; it is possibly a subtype of the G-type star, like a G1 star.
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Category:Astronomical classifications