HD 195479

HD 195479
Location of HD 195479 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 30m 58.26388s[1]
Declination +20° 36′ 23.0762″[1]
Apparent magnitude (V) 6.20±0.01[2]
Characteristics
Spectral type kA1 hA9 mF2[3]
U−B color index +0.13[4]
B−V color index +0.12[4]
Astrometry
Radial velocity (Rv)−40.1±1.6[5] km/s
Proper motion (μ) RA: +95.633 mas/yr[1]
Dec.: +58.78 mas/yr[1]
Parallax (π)11.3074 ± 0.0337 mas[1]
Distance288.4 ± 0.9 ly
(88.4 ± 0.3 pc)
Absolute magnitude (MV)+1.53[6]
Details
Mass2.05+0.38
−0.24[7] M☉
Radius2.15±0.11[8] R☉
Luminosity38.96+0.36
−0.42[1] L☉
Surface gravity (log g)4.08[9] cgs
Temperature8,454[10] K
Metallicity [Fe/H]−0.11[11] dex
Rotational velocity (v sin i)18.0±0.6[9] km/s
Age631[12] Myr
Other designations
AG+20°2271, BD+20°4602, GC 28540, HD 195479, HIP 101213, HR 7839, SAO 88783, CCDM J20310+2036A, WDS J20310+2036A, TIC 379435621[13]
Database references
SIMBADdata

HD 195479, also designated as HR 7839, is a solitary star located in the northern constellation Delphinus, the dolphin. It has an apparent magnitude of 6.20,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of 288 light-years based on Gaia DR3 parallax measurements[1] and it is drifting closer with a heliocentric radial velocity of −40.1 km/s.[5] At its current distance, HD 195479's brightness is diminished by an interstellar extinction of 0.27 magnitudes[14] and it has an absolute magnitude of +1.53.[6]

HD 195479 is an Am star with a stellar classification of kA1hA9mF2.[3] The notion indicates that it has the calcium K-lines of an A1 star, the hydrogen lines of an A9 star, and the metallic lines of a F2 star. It has 2.05 times the mass of the Sun[7] and 2.15 times the radius of the Sun.[8] It radiates 38.96 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 8,454 K,[10] giving it white hue when viewed in the night sky. HD 195479 is deficient in iron, having an abundance 77.6% of the Sun's.[11] It is estimated to be 631 million years old[12] and it spins modestly with a projected rotational velocity of 18.0 km/s,[9] common for Am stars.

The star has two optical companions: a 12th magnitude star designated B located 5.7" away along a position angle of 88° and a 13th magnitude star designated C located 55.9" away along a position angle of 206°.[15] They were both observed by American astronomer Sherburne Wesley Burnham during the late 19th century.[16] B and C are both background stars that are far more distant than HD 195479.[17][18]

  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 Fabricius2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mendoza1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 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 Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Shorlin2002 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Burnham1875 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference GaiaDR3C was invoked but never defined (see the help page).