12 Aquilae

12 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 01m 40.8272s
Declination -05° 44′ 20.814″
Apparent magnitude (V) 4.027
Characteristics
Spectral type K1III
U−B color index 1.09
B−V color index 1.09
R−I color index 0.54
Variable type Variable star
Astrometry
Radial velocity (Rv) -43.9 km/s
Proper motion (μ) RA: -24.15 mas/yr
Dec.: -39.73 mas/yr
Parallax (π) 21.95 ± 0.92 mas
Distance 149 ± 6 ly
(46 ± 2 pc)
Absolute magnitude (MV) 5.133
Details
Mass 0,8 M
Radius 0,9 R
Luminosity 0,4 L
Temperature 3,500–5,000 K
Metallicity ?
Rotation < 17 km/s
0,007348 Year
Age ? years
Other designations
ZI 1577, GSC 05140-04781, 2MASS J19014083-0544209, TD1 23702, HD 176678, NSV 11655, TYC 5140-4781-1, i Aql, HIC 93429, PLX 4414, UBV M 23405, BD-05° 4840, HIP 93429, PPM 202441, UBV 16146, CSV 101794, HR 7193, RAFGL 2302, YZ 95 6515, GC 26141, IRAS 18589-0548, ROT 2705, YZ 0 4050, GCRV 11472, IRC -10483, SAO 142931, JP11 3061.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

12 Aquilae (12 Aql) or i Aquilae (i Aql) is a fourth-magnitude star in the constellation Aquila. 12 Aquilae is a star varying in both magnitude and spectral type. Its apparent magnitude is 4.02. 12 Aquilae is located about 150 light-years from Earth.

Sometimes, this star is called by the name Bered, derived the Hebrew word בָּרָד barad, meaning "storm". In Chinese, 天弁 (Tiān Biàn), meaning Market Officer, refers to an asterism consisting of 12 Aquilae, α Scuti, δ Scuti, ε Scuti, β Scuti, η Scuti, λ Aquilae, 15 Aquilae and 14 Aquilae.[1] Consequently, 12 Aquilae itself is known as 天弁六 (Tiān Biàn liù, English: the Sixth Star of Market Officer.)

References

  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 978-986-7332-25-7.

External links