Eta Aquilae

η Aquilae
Location of η Aql (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 52m 28.3689s[1]
Declination +01° 00′ 20.372″[1]
Apparent magnitude (V) 3.87[2] (3.49 – 4.3[3])
Characteristics
Spectral type F6 Iab[4] (or F6Ib–G4Ib[3]) + B9.8 V[4] + F1-5 V[5]
U−B color index +0.51[6]
B−V color index +0.89[6]
Variable type δ Cep[7]
Astrometry
Radial velocity (Rv)10.82±0.55[1] km/s
Proper motion (μ) RA: +8.89 mas/yr[1]
Dec.: –8.322 mas/yr[1]
Parallax (π)3.6715 ± 0.1942 mas[1]
Distance885.4+41.7
−45 ly
(271.6+12.8
−13.8 pc)[8]
Absolute magnitude (MV)−3.70[4]
Details
A
Mass4.24±0.58;[9] 5.7;[4] 6.15;[1] M☉
Radius59±2[10] R☉
Luminosity3,368±195[10] L☉
Surface gravity (log g)1.834[11] cgs
Temperature5,747±19[10] K
Metallicity [Fe/H]–0.19[1] dex
Age150±50[9] Myr
B
Mass2.3[4] M☉
Other designations
55 Aquilae, BD+00°4337, FK5 746, HD 187929, HIP 97804, HR 7570, SAO 125159, AAVSO 1947+00, 2MASS J19522835+0100203
Database references
SIMBADdata

Eta Aquilae (η Aql, η Aquilae) is a multiple star in the equatorial constellation of Aquila, the eagle. It was once part of the former constellation Antinous. Its apparent visual magnitude varies between 3.49 and 4.3,[3] making it one of the brighter members of Aquila. Based upon parallax measurements made by the Gaia spacecraft on its third data release (DR3), this star is located at a distance of roughly 272 parsecs (890 light-years).[1] The primary component is a Classical Cepheid variable.[7]

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  7. ^ a b Cite error: The named reference GCVS-eta-Aql was invoked but never defined (see the help page).
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