- Alpha Piscium
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α Piscium Observation data
Epoch J2000.0 Equinox J2000.0Constellation Pisces Right ascension 02h 02m 02.8s Declination +02° 45' 49" Apparent magnitude (V) +4.33 + 5.23 Distance 139 ly
(42.6 pc)Spectral type A0pSiSr + A3m Other designations Alpha Piscium (α Psc, α Piscium) is a star in the constellation Pisces. It has the traditional name Alrescha (Al Rescha, Alrischa, Alrisha), from the Arabic الرشآء al-rišā’ "the well rope". Less common names are Kaitain and Okda, the latter from the Arabic عقدة ‘uqdah "knot".
The distance to α Psc is about 139 light years. The system comprises a close double star with angular separation of presently 1.8" between the components. The main star is of magnitude +4.33 and spectral type A0p, while the companion is magnitude 5.23 and belongs to spectral class A3m. The two stars take more than 700 years to orbit one another and they will make their closest approach to each other around 2060. One or both of the stars may be a spectroscopic binary as well. The stars have masses of 2.3 and 1.8 solar masses respectively and shine with a total luminosity of 31 and 12 times that of the Sun.
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Bayer Flamsteed 1 • 2 • 3 • 4 (β, Fum al Samakah) • 5 (A) • 6 (γ) • 7 (b) • 8 (κ) • 9 • 10 (θ) • 11 • 12 • 13 • 14 • 15 • 16 • 17 (ι) • 18 (λ) • 19 • 20 • 21 • 22 • 24 • 25 • 26 • 27 • 28 (ω) • 29 • 30 • 31 • 32 (c) • 33 • 34 • 35 • 36 • 37 • 38 • 39 • 40 • 41 (d) • 42 • 43 • 44 • 45 • 46 • 47 • 48 • 49 • 51 • 52 • 53 • 54 • 55 • 57 • 58 • 59 • 60 • 61 • 62 • 63 (δ) • 64 • 65 (i) • 66 • 67 (k) • 68 (h) • 69 (σ) • 70 • 71 (ε) • 72 • 73 • 74 (ψ¹) • 75 • 76 • 77 • 78 • 79 (ψ²) • 80 (e) • 81 (ψ³) • 82 (g) • 83 (τ) • 84 (χ) • 85 (φ) • 86 (ζ) • 87 • 88 • 89 (f) • 90 (υ) • 91 (l) • 92 • 93 (ρ) • 94 • 95 • 96 • 97 • 98 (μ) • 99 (η, Kullat Nunu) • 100 • 101 • 102 (π) • 103 • 104 • 105 • 106 (ν) • 107 • 109 • 110 (ο, Torcularis Septentrionalis) • 111 (ξ) • 112 • 113 (α, Alrescha) • 3 Ari • 4 Cet • 5 CetNearby van Maanen's star • BR • SIMP J013656.5+093347 • GJ 1286 • Gliese 33 • 107 Piscium • GJ 3076 • 2MASS 0036+1821 • GJ 3128 • CFBDS J005910.90-011401.3List Categories:- Pisces constellation
- Bayer objects
- Flamsteed objects
- Stars with proper names
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