Delta Aquarii


Delta Aquarii
δ Aquarii
Aquarius constellation map.svg
Location of δ Aquarii (lower left of center).
Observation data
Epoch J2000      Equinox J2000
Constellation 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/yr
Parallax (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
Skat, Scheat, 76 Aquarii, HD 216627, BD-16° 6173, HGAM 1092, FK5 866, HIP 113136, HR 8709, SAO 165375.
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

  1. ^ Allen (1963). Star Names: Their Lore and Meaning. New York: Dover Publications. ISBN 0486210790. 
  1. ^ (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.
  2. ^ (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



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