HD 108874

HD 108874

Orbits around the star HD108874
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices[1]
Right ascension 12h 30m 26.882s[2]
Declination +22° 52′ 47.38″[2]
Apparent magnitude (V) 8.76[1]
Characteristics
Spectral type G5 V[3] or G9 V[4]
B−V color index 0.738±0.018[1]
Astrometry
Radial velocity (Rv)−30.052±0.0028[5] km/s
Proper motion (μ) RA: 127.469 mas/yr[2]
Dec.: −89.912 mas/yr[2]
Parallax (π)16.7730 ± 0.0443 mas[2]
Distance194.5 ± 0.5 ly
(59.6 ± 0.2 pc)
Absolute magnitude (MV)4.79[1]
Details
Mass0.996±0.032[6] M☉
Radius1.062±0.070[6] R☉
Luminosity1.19[1] L☉
Surface gravity (log g)4.39±[6] cgs
Temperature5,585±20[6] K
Metallicity [Fe/H]0.18[3] dex
Rotation40.20±0.15 days[6]
Rotational velocity (v sin i)1.36±0.26[6] km/s
Age6.48±3.47[6] Gyr
Other designations
BD+23°2466, HD 108874, HIP 61028, SAO 82344, PPM 101950[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 108874 is a star with a pair of orbiting exoplanets in the northern constellation of Coma Berenices. It is located 194.5 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −30 km/s.[5] The absolute magnitude of this star is 4.79,[1] but at that distance the star has an apparent visual magnitude of 8.76,[1] making it too faint to be visible to the naked eye. HD 108874 has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.157″ yr−1.[8]

The spectrum of HD 108874 presents as a G-type main-sequence star with a stellar classification of G5 V.[3] (An alternate source gives a class of G9 V.)[4] It is probably billions of years older than the Sun although the age is not well constrained. The level of magnetic activity in the chromosphere is lower than in the Sun and it is spinning with a low rotation period of 40 days.[6] The star has about the same mass as the Sun, but the radius is 6% larger. The abundance of iron, an indicator of the star's metallicity, is 1.18 times that of the Sun.[6][3] The star is radiating 1.19[1] times the luminosity of the Sun from its photosphere at an effective temperature of about 5600 K.[6]

  1. ^ a b c d e f g h Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Vogt2005 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Yoss_Griffin_1997 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 c d e f g h i j Cite error: The named reference Benatti2017 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).
  8. ^ Cite error: The named reference Lepine_Shara_2005 was invoked but never defined (see the help page).