HD 178233

HD 178233
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 06m 37.7345s[1]
Declination +28° 37′ 42.941″[1]
Apparent magnitude (V) 5.53[2]
Characteristics
Spectral type F0III[3] or A7V[4]
U−B color index +0.04
B−V color index 0.296±0.003[2]
Astrometry
Radial velocity (Rv)−24.0±4.3[5] km/s
Proper motion (μ) RA: 75.662[1] mas/yr
Dec.: 85.291[1] mas/yr
Parallax (π)24.3974 ± 0.0867 mas[1]
Distance133.7 ± 0.5 ly
(41.0 ± 0.1 pc)
Absolute magnitude (MV)2.52[2]
Details
Mass1.54[6] M☉
Radius1.83+0.10
−0.06[1] R☉
Luminosity8.233±0.038[1] L☉
Surface gravity (log g)4.21±0.14[6] cgs
Temperature7,220+126
−175[1] K
Metallicity [Fe/H]0.04[7] dex
Age498[6] Myr
Other designations
BD+28°3193, GC 26317, HD 178233, HIP 93843, HR 7253, SAO 86819[8]
Database references
SIMBADdata

HD 178233 is a single[9] star in the northern constellation of Lyra. It is bright enough to be dimly visible to the naked eye with an apparent visual magnitude of 5.53,[2] making it a sixth magnitude star. The distance to HD 178233 is 134 light years based on parallax measurements, but it is drifting closer to the Sun with a radial velocity of approximately −24 km/s.[5]

The stellar classification of this star was determined to be F0III by A. Cowley and associates (1969),[3] matching an evolved F-type giant star. In contrast, D. R. Palmer and associates (1968) listed it as an A-type main-sequence star with a class of A7V.[4] It is about a half billion years old and is spinning rapidly with a projected rotational velocity of 165.0 km/s, which is giving the star an equatorial bulge that is ~24% wider than the polar radius.[10] The star has 1.5[6] times the mass and 1.8[1] times the mean radius of the Sun. It is radiating over eight times the luminosity of the Sun from its photosphere at an effective temperature of 7,220 K.[1]

  1. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley_et_al_1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Palmer_et_al_1968 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 c d Cite error: The named reference David_Hillenbrand_2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Van_Belle_2012 was invoked but never defined (see the help page).