Delta Aquilae

Delta Aquilae
Location of δ Aquilae (circled) near the center
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 25m 29.90139s[1]
Declination +03° 06′ 53.2061″[1]
Apparent magnitude (V) 3.365[2]
Characteristics
Spectral type F0 IV[3] + K[4]
U−B color index +0.031[2]
B−V color index +0.319[2]
R−I color index +0.16
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)−30.1[6] km/s
Proper motion (μ) RA: +254.54[1] mas/yr
Dec.: +82.51[1] mas/yr
Parallax (π)64.41 ± 1.00 mas[1]
Distance50.6 ± 0.8 ly
(15.5 ± 0.2 pc)
Absolute magnitude (MV)2.46[7]
Orbit[8]
Period (P)3.426 ± 0.006 yr
Semi-major axis (a)0.0539 ± 0.0040″
Eccentricity (e)0.36 ± 0.07
Inclination (i)150 ± 11°
Longitude of the node (Ω)337 ± 9°
Periastron epoch (T)1,954.58 ± 0.13
Argument of periastron (ω)
(secondary)		191 ± 14°
Details
δ Aql Aa
Mass1.65[4] M☉
Radius2.01±0.04[9] R☉
Luminosity8.52±0.26[9] L☉
Surface gravity (log g)4.03[10] cgs
Temperature6,958 ± 46[9] K
Metallicity [Fe/H]−0.04[10] dex
Rotational velocity (v sin i)87.3[11] km/s
δ Aql Ab
Mass0.67[4] M☉
Radius0.61[4] R☉
Other designations
Al Mizān I, δ Aql, 30 Aql, BD+02° 3879, FK5 730, GJ 760, HD 182640, HIP 95501, HR 7377, SAO 124603, NLTT 47775[12]
Database references
SIMBADdata

Delta Aquilae, Latinized from δ Aquilae, is a binary star system in the equatorial constellation of Aquila. It has an apparent visual magnitude of 3.4[2] and, based upon parallax measurements, is located at a distance of about 50.6 light-years (15.5 parsecs) from Earth.[1] It is drifting closer with a radial velocity of −30 km/s.[6] The system is predicted to come to within 25.4 ly (7.8 pc) of the Sun in around 335,000 years.[13]

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