Astronomy:HD 217382
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 47m 24.97075s[1] |
| Declination | +84° 20′ 46.2312″[1] |
| Apparent magnitude (V) | 4.70[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| B−V color index | 1.418±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | +2.57±0.13[1] km/s |
| Proper motion (μ) | RA: +98.346[1] mas/yr Dec.: +24.049[1] mas/yr |
| Parallax (π) | 8.7418 ± 0.0818[1] mas |
| Distance | 373 ± 3 ly (114 ± 1 pc) |
| Absolute magnitude (MV) | −0.49[2] |
| Details | |
| Radius | 37[4] R☉ |
| Luminosity | 317.99[2] L☉ |
| Surface gravity (log g) | 1.96±0.18[5] cgs |
| Temperature | 4,105±42[5] K |
| Metallicity [Fe/H] | +0.09±0.06[5] dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 217382 is a suspected binary star[8] system in the northern circumpolar constellation of Cepheus. It is faintly visible to the naked eye with an apparent visual magnitude of 4.70.[2] The distance to HD 217382 is around 373 light years, as determined from an annual parallax shift of 8.74 mas. The system is moving further away with a heliocentric radial velocity of +2.6 km/s.[1] It is a candidate member of the Hyades supercluster and has a peculiar velocity of 9.2 km/s.[9]
The visible component of this system is an evolved K-type giant star with a stellar classification of K4 III.[3] It is a periodic variable with a frequency of a cycle every 10.64724 days and an amplitude of 0.0041 in magnitude.[3] The star has an estimated 37[4] times the radius of the Sun and is radiating 318[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,105 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society 331 (1): 45–59, doi:10.1046/j.1365-8711.2002.05150.x, Bibcode: 2002MNRAS.331...45K.
- ↑ 4.0 4.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 5.0 5.1 5.2 5.3 Sharma, Kaushal et al. (2016), "New atmospheric parameters and spectral interpolator for the MILES cool stars", Astronomy & Astrophysics 585: 27, doi:10.1051/0004-6361/201526111, A64, Bibcode: 2016A&A...585A..64S. See: Miles 850.
- ↑ De Medeiros, J. R. et al. (October 2002), "The Rotation of Binary Systems with Evolved Components", The Astrophysical Journal 578 (2): 943–950, doi:10.1086/342613, Bibcode: 2002ApJ...578..943D.
- ↑ "HD 217382". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+217382.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Montes, D. et al. (November 2001), "Late-type members of young stellar kinematic groups - I. Single stars", Monthly Notices of the Royal Astronomical Society 328 (1): 45–63, doi:10.1046/j.1365-8711.2001.04781.x, Bibcode: 2001MNRAS.328...45M.
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