HD 191104

HD 191104

Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	6.443
Characteristics
Spectral type	F3V
U−B Template:Engvar	−0.033
B−V Template:Engvar	+0.472
Astrometry
Radial velocity (Rv)	−27 km/s
Proper motion (μ)	RA: +46.75 mas/yr Dec.: +28.81 mas/yr
Parallax (π)	25.40±1.00 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	+3.46
Orbit
Primary	A
Companion	B
Period (P)	604.7 yr
Semi-major axis (a)	3.4″
Orbit
Primary	Ba
Companion	Bb
Period (P)	23.8 days
Eccentricity (e)	0.123
Semi-amplitude (K1) (primary)	16.2 km/s
Semi-amplitude (K2) (secondary)	16.6 km/s
Details
A
Mass	1.2 Template:Solar mass
Radius	1.4 Template:Solar radius
Luminosity	2.9 Template:Solar luminosity
Temperature	6,615 K
Rotation	9.34 days
Age	722 Myr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Ba
Mass	0.74 Template:Solar mass
Bb
Mass	0.72 Template:Solar mass
Metallicity [Fe/H]	dex
Other designations
BD+08°4344, HD 191104, HIP 99158, HR 7693, SAO 125478
Database references
SIMBAD	data
	A
	B

HD 191104 is a star system in the equatorial constellation of Aquila. Two of the components form a close spectroscopic binary system, while a third star, also thought to be a spectroscopic binary, orbits the pair at a greater distance.

External links

• HR 7693
• Image HD 191104