Zeta Scuti

ζ Scuti

Template:Location mark Location of ζ Scuti (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Scutum
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	4.66
Characteristics
Spectral type	G9 IIIb Fe-0.5
U−B Template:Engvar	+0.72
B−V Template:Engvar	+0.94
Astrometry
Radial velocity (Rv)	−5.02 km/s
Proper motion (μ)	RA: +49.59 mas/yr Dec.: +51.24 mas/yr
Parallax (π)	15.78±1.02 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	0.66
Orbit
Primary	ζ Scuti A
Companion	ζ Scuti B
Period (P)	2373.7 days
Semi-major axis (a)	21.6 mas
Eccentricity (e)	0.1
Inclination (i)	89°
Longitude of the node (Ω)	226°
Periastron epoch (T)	2418278.3
Argument of periastron (ω) (secondary)	242.1°
Details
Mass	1.29 Template:Solar mass
Radius	9.3 Template:Solar radius
Luminosity	62.04 Template:Solar luminosity
Surface gravity (log g)	2.61 cgs
Temperature	4,750 K
Metallicity [Fe/H]	−0.08 dex
Rotational velocity (v sin i)	1.5 km/s
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

Zeta Scuti, Latinized from ζ Scuti, is the Bayer designation for a star in the southern constellation of Scutum. It is a faint star but visible to the naked eye with an apparent magnitude of 4.66. The distance to this star, as determined via parallax measurement, is around 210 light years. It is moving closer to the Sun with a radial velocity of −5 km/s.

This is an astrometric binary system with a period of 6.5 years (2,374 days) and an orbital eccentricity of 0.10. The visible component is an aging giant star of type G with a stellar classification of G9 IIIb Fe−0.5. The suffix notation indicates the spectrum displays a mild underabundance of iron. It has 1.29 times the mass of the Sun and has expanded to 9.3 times the Sun's radius. The star is radiating 62 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,750 K.