HD 27631

HD 27631
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Horologium
Right ascension 04h 19m 45.46920s[1]
Declination –41° 57′ 36.9527″[1]
Apparent magnitude (V) 8.243±0.012[2]
Characteristics
Spectral type G3IV[2]
B−V color index 0.721±0.009[2]
Astrometry
Radial velocity (Rv)21.04±0.13[1] km/s
Proper motion (μ) RA: –41.139 mas/yr[1]
Dec.: –91.908 mas/yr[1]
Parallax (π)19.9263 ± 0.0160 mas[1]
Distance163.7 ± 0.1 ly
(50.18 ± 0.04 pc)
Absolute magnitude (MV)4.97[3]
Details[2]
Mass0.944±0.032 M☉
Radius0.923±0.033 R☉
Luminosity0.97[3] L☉
Surface gravity (log g)4.455±0.038 cgs
Temperature5,737±36 K
Metallicity [Fe/H]−0.12±0.05 dex
Rotation~31 d
Age4.010±2.892 Gyr
Other designations
CD−42°1464, HD 27631, HIP 20199, SAO 216753[4]
Database references
SIMBADdata
Exoplanet Archivedata

HD 27631 is a star with an orbiting exoplanet in the southern constellation of Horologium. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.24.[2] The distance to this system is 164 light years based on parallax measurements. It is drifting further away with a radial velocity of 21 km/s.[1]

This is a G-type star with a stellar classification of G3IV,[2] suggesting it is a subgiant star that is evolving off the main sequence after exhausting the supply of hydrogen at its core. It is smaller than the Sun, with 94% of its mass and 92% of the radius.[2] The star is radiating 97%[3] of the luminosity of the Sun from its photosphere at an effective temperature of 5,737 K.[2] The estimated age is roughly 4.4 billion years[5] and it is spinning slowly with a rotation period of around 31 days.[2]

A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 40 astronomical units.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Barbato_et_al_2018 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Marmier2013 was invoked but never defined (see the help page).
  6. ^ Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. Bibcode:2015MNRAS.450.3127M. doi:10.1093/mnras/stv771. hdl:1887/49340. Retrieved 19 June 2020.