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Epsilon Persei
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Perseus
Right ascension	03h 57m 51.23s
Declination	+40° 00′ 36.8″
Apparent magnitude (V)	2.90
Characteristics
Spectral type	B0.5 IV-III
Astrometry
Proper motion (μ)	RA: 14.06 ± 0.26 mas/yr ; Dec.: -23.78 ± 0.17 mas/yr
Parallax (π)	5.11 ± 0.23 mas
Distance	640 ± 30 ly ; (196 ± 9 pc)
Details
Other designations
	45 Persei, HD 24760, HR 1220, SAO 56840, BD +39 895, HIP 18532

Epsilon Persei (ε Per / ε Per) is a Class B0.5 IV-III, third-magnitude star in the constellation Perseus. It is, on rare occasions, called by the proper name Adid Australis, meaning "Southern One of the Upper Arm" [of the Pleiades], in Arabic.

Epsilon Persei is actually a multiple star system consisting of two main components: a blue main-sequence star of class B0.5V and a magnitude of 2.90, and a lesser white companion of class A2V and a magnitude of 3.92. The Epsilon Persei stellar system is located about 640 light-years from Earth.^[1]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007). "HIP 18532". Hipparcos, the New Reduction. Retrieved 2010-04-10.
^ Tarasov; et al. (1995). "The archetype line-profile variable ε 45 Persei is a spectroscopic triple system". Astronomy and Astrophysics Supplement. 110: 59–79. {{cite journal}}: Explicit use of et al. in: |author= (help)
^ "HIP 18532". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-04-10.

External links

Al-Thurayya

[hipparcos-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007). "HIP 18532". Hipparcos, the New Reduction. Retrieved 2010-04-10.

[Tarasov-2] Tarasov; et al. (1995). "The archetype line-profile variable ε 45 Persei is a spectroscopic triple system". Astronomy and Astrophysics Supplement. 110: 59–79. {{cite journal}}: Explicit use of et al. in: |author= (help)

[simbad-3] "HIP 18532". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-04-10.

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