HD 217382

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 319 light years, as determined from an annual parallax shift of 10.2152 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]

HD 217382
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension  22h 47m 29.06123s[1]
Declination +83° 09′ 13.7788″[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)+2.55±0.20[1] km/s
Proper motion (μ) RA: +24.943[1] mas/yr
Dec.: +47.532[1] mas/yr
Parallax (π)10.2152 ± 0.1815[1] mas
Distance319 ± 6 ly
(98 ± 2 pc)
Absolute magnitude (MV)−0.49[2]
Details
Radius37[4] R☉
Luminosity317.99[2] L☉
Surface gravity (log g)1.96±0.18[5] cgs
Temperature4,105±42[5] K
Metallicity [Fe/H]+0.09±0.06[5] dex
Rotational velocity (v sin i)1.0[6] km/s
Other designations
BD+83° 640, FK5 1649, HD 217382, HIP 113116, HR 8748, SAO 3816, ADS 16294, WDS J22475+8309AB[7]
Database references
SIMBADdata

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. 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.
  2. 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.
  3. Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
  4. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  5. Sharma, Kaushal; et al. (2016), "New atmospheric parameters and spectral interpolator for the MILES cool stars", Astronomy & Astrophysics, 585: 27, arXiv:1512.04882, Bibcode:2016A&A...585A..64S, doi:10.1051/0004-6361/201526111, A64. See: Miles 850.
  6. De Medeiros, J. R.; et al. (October 2002), "The Rotation of Binary Systems with Evolved Components", The Astrophysical Journal, 578 (2): 943–950, arXiv:astro-ph/0207288, Bibcode:2002ApJ...578..943D, doi:10.1086/342613.
  7. "HD 217382". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-11.
  8. 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.
  9. 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, arXiv:astro-ph/0106537, Bibcode:2001MNRAS.328...45M, doi:10.1046/j.1365-8711.2001.04781.x.
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