HD 198404

HD 198404
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 49m 59.0925s[1]
Declination +05° 32′ 40.5081″[1]
Apparent magnitude (V) 6.19±0.01[2]
Characteristics
Spectral type K0[3]
U−B color index +0.79[4]
B−V color index +0.98[4]
Astrometry
Radial velocity (Rv)−21.63±0.31[5] km/s
Proper motion (μ) RA: +43.408 mas/yr[1]
Dec.: −0.174 mas/yr[1]
Parallax (π)8.2537 ± 0.1261 mas[1]
Distance395 ± 6 ly
(121 ± 2 pc)
Absolute magnitude (MV)+0.7[6]
Details
Mass3.12[7] M☉
Radius10.54[8] R☉
Luminosity56.3[9] L☉
Surface gravity (log g)2.8[7] cgs
Temperature4,809[10] K
Metallicity [Fe/H]+0.17[7] dex
Other designations
21 G. Delphini, AG+05°3046, BD+05°4626, GC 29044, HD 198404, HIP 102833, HR 7975, SAO 126267, WDS J20500+0533A[11][12]
Database references
SIMBADdata

HD 198404 (HR 7975) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.19,[2] allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 395 light years[1] and it is approaching the Solar System with a heliocentric radial velocity of −21.6 km/s.[5]

HD 198404 has a simple stellar classification of K0,[3] indicating that it is a K-type star. Its enlarged diameter of 10.54 R☉[8] and its low surface gravity[7] suggest that it has evolved away from the main sequence to become a giant star.[7] HD 198404 has 3.12 times the mass of the Sun[7] and radiates at 56 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,809 K,[10] giving it a yellowish orange hue. The star is metal enriched, having an iron abundance 48% greater than that of the Sun.[7]

HD 198404 has an optical companion located 78.2″ away along a position angle of 127° (as of 2014).[13]

  1. ^ a b c d e Cite error: The named reference EDR3 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. ^ a b Cite error: The named reference Cousins1964 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. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference Liu2014 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).