Zeta Scuti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 23m 39.58309s |
| Declination | −08° 56′ 03.7885″ |
| Apparent magnitude (V) | 4.66 |
| Characteristics | |
| Spectral type | G9 IIIb Fe-0.5 |
| U−B color index | +0.72 |
| B−V color index | +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 | 210 ± 10 ly (63 ± 4 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 M☉ |
| Radius | 9.3 R☉ |
| Luminosity | 62.04 L☉ |
| 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 |
| Other designations | |
| ζ Sct, BD−09°4712, GC 25101, HD 169156, HIP 90135, HR 6884, SAO 142267, GSC 05690-01263 | |
| 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.