HD 175443 is a single[7] star in the northern constellation of Lyra. This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.64.[2] It is located at a distance of approximately 418 light years based on parallax,[1] and has an absolute magnitude of 0.42.[2] The star is drifting further away with a radial velocity of +13 km/s.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 54m 13.24716s[1] |
| Declination | +27° 54′ 34.2928″[1] |
| Apparent magnitude (V) | 5.64[2] |
| Characteristics | |
| Spectral type | K4III[3] |
| B−V color index | 1.361±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +13.3±0.3[2] km/s |
| Proper motion (μ) | RA: −7.526[1] mas/yr Dec.: −71.496[1] mas/yr |
| Parallax (π) | 7.8072 ± 0.0781 mas[1] |
| Distance | 418 ± 4 ly (128 ± 1 pc) |
| Absolute magnitude (MV) | 0.42[2] |
| Details | |
| Radius | 22.08+1.01 −1.25[1] R☉ |
| Luminosity | 150.7±1.9[1] L☉ |
| Surface gravity (log g) | 1.84[4] cgs |
| Temperature | 4,304+128 −94[1] K |
| Metallicity [Fe/H] | −0.19[4] dex |
| Rotational velocity (v sin i) | 1.0[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K4III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. It now has 22 times the girth of the Sun and is radiating 151 times the luminosity of the Sun at an effective temperature of 4,304 K.[1] The metallicity, or abundance of elements with higher atomic numbers than helium, is lower than in the Sun,[4] and it is spinning slowly with a projected rotational velocity of 1.0 km/s.[5]
References
edit- ^ a b c d e f g h i j Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g 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.
- ^ a b Wilson, Ralph E.; Joy, Alfred H. (March 1950), "Radial Velocities of 2111 Stars", Astrophysical Journal, 111: 221, Bibcode:1950ApJ...111..221W, doi:10.1086/145261
- ^ a b c Jönsson, H.; et al. (February 2017), "Abundances of disk and bulge giants from high-resolution optical spectra. I. O, Mg, Ca, and Ti in the solar neighborhood and Kepler field samples", Astronomy & Astrophysics, 598: 11, arXiv:1611.05462, Bibcode:2017A&A...598A.100J, doi:10.1051/0004-6361/201629128, S2CID 49573306, A100.
- ^ a b De Medeiros, J. R.; et al. (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.
- ^ "HD 175443". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-08.
- ^ 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.