| 11. | V520 Persei is a supergiant with a spectral class of B3.
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| 12. | Its spectral class is B8 and it has a luminosity of.
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| 13. | Some of the most massive stars lie within this spectral class.
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| 14. | The secondary may itself have an orbiting stellar companion of spectral class F8.
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| 15. | Its spectral class is intermediate between the C-type and P-type asteroids.
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| 16. | The derived spectral class varies depending on the features examined.
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| 17. | This star is unusually close to Tau Ceti, a star of spectral class G8.
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| 18. | Its apparent magnitude is + 4.25 and it belongs to the spectral class K4.5III-IIIb.
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| 19. | The primary has an absolute magnitude of 2.6 and is of spectral class F0.
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| 20. | There is some uncertainty as to its spectral class.
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