HD 217382

HD 217382
Observation data
Epoch J2000      Equinox J2000
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 mas[1]
Distance373 ± 3 ly
(114 ± 1 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

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]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference koen2002 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference CADARS was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference sharma2016 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference DeMedeiros2002 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Montes2001 was invoked but never defined (see the help page).