Location of ζ Scuti (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18 23 39.58309 |
| Declination | −8° 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 | −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.
References
- ^ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
- Jancart, S. (2005). "Astrometric orbits of SB stars". Astronomy and Astrophysics. 442 (1): 365–380. arXiv:astro-ph/0507695. Bibcode:2005A&A...442..365J. doi:10.1051/0004-6361:20053003. S2CID 15123997.
- ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785–796. arXiv:1607.00619. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078. S2CID 73524157. Vizier catalog entry
- De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID 54046583. Vizier catalog entry
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