- Delta Cassiopeiae
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Ruchbah, δ Cassiopeiae Observation data
Epoch J2000 Equinox J2000Constellation Cassiopeia Right ascension 01h 25m 48.9523s[1] Declination +60° 14′ 07.019″[1] Apparent magnitude (V) 2.68 [1] Characteristics Spectral type A5III-IVv [1] U−B color index 0.12 [1] B−V color index 0.13 [1] Variable type ? Astrometry Radial velocity (Rv) −6.7 [1] km/s Proper motion (μ) RA: 297.24 [1] mas/yr
Dec.: −49.50 [1] mas/yrParallax (π) 32.81 ± 0.72[1] mas Distance 99 ± 2 ly
(30.5 ± 0.7 pc)Absolute magnitude (MV) 0.24 Details Mass 2.5 [2] M☉ Radius ~4 [2] R☉ Luminosity 63 [2] L☉ Temperature 8,400 [2] K Metallicity ? Rotation 19 km/s. [2] Age 6.0×108[2] years Other designations Database references SIMBAD data Delta Cassiopeiae (δ Cas, δ Cassiopeiae) is a star in the constellation Cassiopeia. It has the traditional names Ksora and Ruchbah, derived from the Arabic word ركبة rukbah meaning "knee". It is not to be confused with Alpha Sagittarii, which also is called Ruchbah or Rukbat, from the Arabic word ركبة rukbah meaning "knee".
In Chinese, 閣道 (Gé Dào), meaning Flying Corridor, refers to an asterism consisting of δ Cassiopeiae, ι Cassiopeiae, ε Cassiopeiae, θ Cassiopeiae, ν Cassiopeiae and ο Cassiopeiae.[3] Consequently, δ Cassiopeiae itself is known as 閣道三 (Gé Dào sān, English: the Third Star of Flying Corridor.)[4]
Delta Cassiopeiae is an eclipsing binary with a period of 460[2] days. Its apparent magnitude varies between +2.68 mag and +2.74. It is of spectral class A3, and is approximately 99 light years from Earth.
References
- ^ a b c d e f g h i j "SIMBAD query result: V* del Cas -- Variable Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HR403. Retrieved 2010-02-21.
- ^ a b c d e f g Professor James B. (Jim) Kaler. "RUCHBAH (Delta Cassiopeiae)". University of Illinois. http://stars.astro.illinois.edu/sow/Segin.html. Retrieved 2010-02-21.
- ^ (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 978-986-7332-25-7.
- ^ (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
Bayer Flamsteed 1 • 2 • 4 • 5 (τ) • 6 • 7 (ρ) • 8 (σ) • 9 • 10 • 11 (β, Caph) • 12 • 13 • 14 (λ) • 15 (κ) • 16 • 17 (ζ) • 18 (α, Schedar) • 19 (ξ) • 20 (π) • 21 • 22 (ο) • 23 • 24 (η, Achird) • 25 (ν) • 26 (υ1) • 27 (γ, Tsih) • 28 (υ2) • 30 (μ) • 31 • 32 • 33 (θ) • 34 (φ) • 35 • 36 (ψ) • 37 (δ, Ruchbah) • 38 • 39 (χ) • 40 • 42 • 43 • 44 • 45 (ε, Segin) • 46 (ω) • 47 • 48 (A) • 49 • 50 • 51 • 52 • 53 • 54 • 55List Categories:- Variable star stubs
- Multiple star stubs
- Cassiopeia constellation
- Bayer objects
- Eclipsing binaries
- A-type giants
- A-type subgiants
- Stars with proper names
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