HD 194688

HD 194688
Location of HD 194688 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 26m 23.15478s[1]
Declination +17° 18′ 56.0140″[1]
Apparent magnitude (V) 6.22±0.01[2]
Characteristics
Spectral type K0[3]
B−V color index +1.01[4]
Astrometry
Radial velocity (Rv)−17.12±0.27[5] km/s
Proper motion (μ) RA: +5.397 mas/yr[1]
Dec.: −5.426 mas/yr[1]
Parallax (π)3.6827 ± 0.0184 mas[1]
Distance886 ± 4 ly
(272 ± 1 pc)
Absolute magnitude (MV)−1.19[6]
Details
Mass1.57[7] M☉
Radius21.58[8] R☉
Luminosity258+3
−2[1] L☉
Surface gravity (log g)1.91[7] cgs
Temperature4,995±122[9] K
Metallicity [Fe/H]−0.13[7] dex
Other designations
AG+17°2201, BD+16°4259, FK5 3635, GC 28435, HD 194688, HIP 100807, HR 7816, SAO 106101, TIC 305526917[10]
Database references
SIMBADdata

HD 194688, also designated as HR 7816, is a solitary star located in the northern constellation Delphinus, the dolphin. It has an apparent magnitude of 6.22,[2] placing it near the limit for naked eye visibility. The object is located relatively far away at a distance of 886 light-years based on Gaia DR3 parallax measurements,[1] but it is drifting closer with a heliocentric radial velocity of −17.12 km/s.[5] At its current distance, HD 196488's brightness is diminished due to an interstellar extinction of 0.17 magnitudes[11] and it has an absolute visual magnitude of −1.19.[6]

HD 194688 has a simple stellar classification of K0,[3] indicating that it is an early K-type star. It has 1.57 times the mass of the Sun[7] and an enlarged radius 21.58 times that of the Sun.[8] It radiates 258 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,995 K,[9] giving it an orangish-yellow hue when viewed in the night sky. The large radius and high luminosity suggests that HD 194688 may be an evolved giant star. It is slightly metal-deficient with an iron abundance 74.1% that of the Sun's.[7]

  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 Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cannon1923 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Haggkvist1970 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).