Epoch J2000 Equinox J2000
|Right ascension||00h 17m 43.0617s|
|Declination||+51° 25′ 59.125″|
|Apparent magnitude (V)||6.102|
|Spectral type||O9III + O9III|
|Variable type||β Lyr|
|Radial velocity (Rv)||-35.2 km/s|
|Proper motion (μ)||RA: -4.19 mas/yr
Dec.: -1.62 mas/yr
|Parallax (π)||0.57 ± 0.69 mas|
|Distance||approx. 6,000 ly
(approx. 2,000 pc)
|AO Cas A|
|Radius||11.5 / 7.5 R☉|
|AO Cas B|
AO Cassiopeiae, also known as Pearce's Star, is a binary system, composed of two massive hot blue stars of spectral types O7/O9III and O8/O9III that each weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of our Sun respectively. The system is an eclipsing binary with a period of roughly 3.5 days, with the apparent magnitude ranging between 6.07 and 6.24. Stars of this brightness are generally just visible to the unaided eye in dark skies in semirural locations.
The component stars are so close to each other they are ellipsoidal (egg-shaped).
- Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355
- Watson, Christopher (4 January 2010). "AO Cassiopeiae". AAVSO Website. American Association of Variable Star Observers. Retrieved 15 February 2014.
- Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 5 February 2014.
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