- Delta Aquarii
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δ Aquarii Observation data
Epoch J2000 Equinox J2000Constellation Aquarius Right ascension 22h 54m 39.0125s Declination −15° 49′ 14.953″ Apparent magnitude (V) 3.269 Characteristics Spectral type A3V U−B color index 0.08 B−V color index 0.05 Astrometry Radial velocity (Rv) 18 km/s Proper motion (μ) RA: -44.08 mas/yr
Dec.: -24.81 mas/yrParallax (π) 20.44 ± 2.26 mas Distance approx. 160 ly
(approx. 49 pc)Absolute magnitude (MV) -0.181 Details Mass 3.1 M☉ Radius 2.1 R☉ Luminosity 40 L☉ Temperature 7,500–10,000 K Other designations Database references SIMBAD data Delta Aquarii (δ Aqr, δ Aquarii) is the third-brightest star in the constellation Aquarius. It has the traditional name Skat, which has also been used for Beta Pegasi.
Delta Aquarii is believed to be a stream star member of the Ursa Major Moving Group.
The traditional name has generally been thought to derive from the Arabic as-saq (أساق) "leg" or "shin"; however, the medieval forms Scheat, Seat, Sheat suggest it may be instead from the Arabic ši'at (صعاث') "wish".[1]
In Chinese, 羽林軍 (Yǔ Lín Jūn), meaning Palace Guard, refers to an asterism consisting of δ Aquarii, 29 Aquarii, 35 Aquarii, 41 Aquarii, 47 Aquarii, 49 Aquarii, λ Piscis Austrinus, ε Piscis Austrinus, 21 Piscis Austrinus, υ Aquarii, 68 Aquarii, 66 Aquarii, 61 Aquarii, 53 Aquarii, 50 Aquarii, 45 Aquarii, 58 Aquarii, 64 Aquarii, 65 Aquarii, 70 Aquarii, 74 Aquarii, τ2 Aquarii, τ1 Aquarii, 77 Aquarii, 88 Aquarii, 89 Aquarii, 86 Aquarii, 101 Aquarii, 100 Aquarii, 99 Aquarii, 98 Aquarii, 97 Aquarii, 94 Aquarii, ψ3Aquarii, ψ2Aquarii, ψ1Aquarii, 87 Aquarii, 85 Aquarii, 83 Aquarii, χ Aquarii, ω1 Aquarii and ω2 Aquarii.[1] Consequently, δ Aquarii itself is known as 羽林軍二十六 (Yǔ Lín Jūn ershíliù, English: the Twenty Sixth Star of Palace Guard.)[2]
References
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
External links
Stars of Aquarius Bayer Flamsteed 1 • 2 (ε, Albali) • 3 • 4 • 5 • 6 (μ) • 7 • 8 • 9 • 10 • 11 • 12 • 13 (ν) • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 (β, Sadalsuud) • 23 (ξ, Bunda) • 24 • 25 • 26 • 28 • 29 • 30 • 31 (ο) • 32 • 33 (ι) • 34 (α, Sadalmelik) • 35 • 36 • 37 • 38 • 39 • 40 • 41 • 42 • 43 (θ, Ancha) • 44 • 45 • 46 (ρ) • 47 • 48 (γ, Sadachbia) • 49 • 50 • 51 • 52 (π, Seat) • 53 • 54 • 55 (ζ) • 56 • 57 (σ) • 58 • 59 (υ) • 60 • 61 • 62 (η) • 63 (κ, Situla) • 64 • 65 • 66 • 67 • 68 • 69 (τ1) • 70 • 71 (τ2) • 72 • 73 (λ) • 74 • 75 • 76 (δ, Skat) • 77 • 78 • 80 • 82 • 83 • 85 • 86 • 87 • 88 • 89 • 90 (φ) • 91 (ψ1) • 92 (χ) • 93 (ψ2) • 94 • 95 (ψ3) • 96 • 97 • 98 • 99 • 100 • 101 • 102 (ω1) • 103 • 104 • 105 (ω2) • 106 • 107 • 108List Categories:- Henry Draper Catalogue objects
- Aquarius constellation
- Bayer objects
- A-type main sequence stars
- Stars with proper names
- Star stubs
- Main sequence star stubs
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