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.[2] 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.[5]

ζ Scuti

Location of ζ Scuti (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Scutum
Right ascension	18h 23m 39.58309s[1]
Declination	−8° 56′ 03.7885″[1]
Apparent magnitude (V)	4.66[2]
Characteristics
Spectral type	G9 IIIb Fe-0.5[3]
U−B color index	+0.72[4]
B−V color index	+0.94[4]
Astrometry
Radial velocity (Rv)	−5.02[5] km/s
Proper motion (μ)	RA: +49.59[1] mas/yr Dec.: +51.24[1] mas/yr
Parallax (π)	15.78 ± 1.02 mas[1]
Distance	210 ± 10 ly (63 ± 4 pc)
Absolute magnitude (MV)	0.66[2]
Orbit[6]
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[7] M☉
Radius	9.3[7] R☉
Luminosity	62.04[2] L☉
Surface gravity (log g)	2.61[7] cgs
Temperature	4,750[8] K
Metallicity [Fe/H]	−0.08[2] dex
Rotational velocity (v sin i)	1.5[9] km/s
Other designations
ζ Sct, BD−09° 4712, GC 25101, HD 169156, HIP 90135, HR 6884, SAO 142267, GSC 05690-01263
Database references
SIMBAD	data

This is an astrometric binary system with a period of 6.5 years (2,374 days) and an orbital eccentricity of 0.10.[3] The visible component is an aging giant star of type G with a stellar classification of G9 IIIb Fe−0.5.[3] 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.[7] The star is radiating 62[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,750 K.[8]

References

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[ru] Дзета Щита