Star name	Alcyone, Alcione, Alkyone, Alkione, Alcyon
Constellation	Taurus; Tauri (genitive)
Designation	25 eta Tau, HD 23630, SAO 76199, BS 1165
Association	Pleiades, "The Seven Sisters," open cluster in Taurus
Location (epoch 2000)	RA 3h 47m 29.0s; Dec +24d 06' 18"
Proper motion (arcsec/y)	RA +0.019, Dec -0.044
Proper motion magnitude	0.008 arcsec/y
Spectral type	B7e III
Color	Blue, blue-white (type late B)
Luminosity class	Giant (class III)
Pecularities	Prominent emission lines
Visual magnitude	2.87
Absolute visual magnitude	-2.61
Color index (B - V)	-0.09
Radial veloctiy	+10 km/s
Distance	407.7 ly = 125.0 pc = 3.857 Em
Mass	7 solar masses = 1 x 1031 kg
Radius	8 solar radii = 6 Gm
Surface gravity	0.1 solar gravities = 3 m/s2
Mean density	0.01 solar densities = 20 kg/m3
Rotational velocity	100 km/s
Effective temperature	13200 K
Color index (U - B)0	-0.44
Bolometric correction	-0.97
Bolometric magnitude	-2.5
Luminosity	700 solar luminosities = 3 x 1029 W