Delta Boötis

Delta Boötis
δ Boötis
Boötes constellation map.png
Location of δ Boötis, left of center
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 15h 15m 30.163s
Declination +33° 18′ 53.401″
Apparent magnitude (V) 3.47
Characteristics
Spectral type G8IIIFe-1
U−B color index 0.66
B−V color index 0.95
R−I color index 0.51
Variable type Variable star
Astrometry
Radial velocity (Rv) -12.3 km/s
Proper motion (μ) RA: 84.84 mas/yr
Dec.: -110.57 mas/yr
Parallax (π) 27.94 ± 0.61 mas
Distance 117 ± 3 ly
(35.8 ± 0.8 pc)
Absolute magnitude (MV) 4.42
Details
Mass 1.1 M
Radius 1.1 R
Luminosity 1.2 L
Temperature 5,000–6,000 K
Rotation < 19 km/s
Other designations
49 Boötis, HR 5681, HD 135722, BD+33°2561, FK5 563, HIP 74666, SAO 64589.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)
Database references
SIMBAD data

Delta Boötis (δ Boo, δ Boötis) is a binary star in the constellation Boötes. It is approximately 117 light years from Earth. The primary component is a yellow G-type giant with an apparent magnitude of +3.46. Its companion is a yellow G-type main sequence dwarf with an apparent magnitude of +8.7.

Sometimes, this star is called by the name Princeps, meaning prince or prime in Latin[1].

In Chinese, 七公 (Qī Gōng), meaning Seven Excellencies, refers to an asterism consisting of δ Boötis, 42 Herculis, τ Herculis, φ Herculis, χ Herculis, ν1 Boötis and μ1 Boötis.[2] Consequently, δ Boötis itself is known as 七公七 (Qī Gōng qī, English: the Seventh Star of Seven Excellencies.)[3]

Delta Boötis

About 3800 AU apart, the two take about 120,000 years to orbit each other.

References

  1. ^ Constellations of Word - Boötes (Princeps)
  2. ^ (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.
  3. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日

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