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HD 190228

HD 190228
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 20h 03m 00.77266s[1]
Declination +28° 18′ 24.6871″[1]
Apparent magnitude (V) 7.30[2]
Characteristics
Evolutionary stage subgiant[3]
Spectral type G5 IV[4]
B−V color index 0.793±0.006[2]
Astrometry
Radial velocity (Rv)−50.110±0.0032[5] km/s
Proper motion (μ) RA: 104.273 mas/yr[1]
Dec.: −69.961 mas/yr[1]
Parallax (π)15.8973 ± 0.0159 mas[1]
Distance205.2 ± 0.2 ly
(62.90 ± 0.06 pc)
Absolute magnitude (MV)3.36[2]
Details[6]
Mass1.18±0.05 M☉
Radius2.38±0.13 R☉
Luminosity4.57+1.39
−0.77 L☉
Surface gravity (log g)3.92±0.02 cgs
Temperature5,311±13 K
Metallicity [Fe/H]–0.24±0.06 dex
Rotational velocity (v sin i)1.43±0.51 km/s
Age5.07±0.78 Gyr
Other designations
BD+27° 3593, HD 190228, HIP 98714, SAO 88118, PPM 110298, GCRV 70273[7]
Database references
SIMBADdata
ARICNSdata

HD 190228 is a star with an orbiting substellar companion in the northern constellation of Vulpecula. Its apparent magnitude is 7.30[2] – too faint to be seen with the naked eye – and the absolute magnitude is 3.34.[2] Based on parallax measurements, it is located at a distance of 205 light-years (63 parsecs) from the Sun.[1] The system is drifting closer with a radial velocity of −50 km/s.[5]

The spectrum of HD 190228 presents as a subgiant star with a stellar classification of G5 IV,[4] indicating it has exhausted the supply of hydrogen at its core and is evolving off the main sequence. The star is older than the Sun with an age over 5 billion years with a projected rotational velocity of 1.4 km/s. A metal-poor star, it has 18% more mass than the Sun and has grown to 2.4 times the Sun's girth. The star is radiating roughly 4.6 times the luminosity of the Sun from its photosphere at an effective temperature of 5,311 K.[6]

  1. ^ a b c d e Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Chen2001 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference White_et_al_2007 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Jofré_et_al_2015 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).

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