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 | |
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.[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]
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]
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