HD 27894

HD 27894
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Reticulum[1]
Right ascension 04h 20m 47.046s[2]
Declination −59° 24′ 39.02″[2]
Apparent magnitude (V) 9.36[1]
Characteristics
Spectral type K2 V[3]
U−B color index +0.90[4]
B−V color index +1.003±0.002[1]
Astrometry
Radial velocity (Rv)82.785±0.0008[5] km/s
Proper motion (μ) RA: 182.473±0.012 mas/yr[2]
Dec.: 270.012±0.017 mas/yr[2]
Parallax (π)22.8888 ± 0.0121 mas[2]
Distance142.50 ± 0.08 ly
(43.69 ± 0.02 pc)
Absolute magnitude (MV)6.225[6]
Details
Mass0.83±0.03[7] M☉
Radius0.79±0.02[7] R☉
Luminosity0.33±0.01[7] L☉
Surface gravity (log g)4.56±0.03[7] cgs
Temperature4,923±32[7] K
Metallicity [Fe/H]+0.30±0.07[6] dex
Rotation44 days[6]
Rotational velocity (v sin i)≤ 1.5[6] km/s
Age7.7±2.3[8] Gyr
Other designations
CD−59° 829, HD 27894, HIP 20277, LTT 1953[4]
Database references
SIMBADdata

HD 27894 is a single star with a system of orbiting exoplanets, located in the southern constellation of Reticulum. It is too faint to be seen with the naked eye at an apparent visual magnitude of 9.36.[1] This system lies at a distance of 142.5 light years from the Sun, as determined via parallax measurements, and is drifting further away with a radial velocity of 83 km/s.[5]

The spectrum of HD 27894 presents as a K-type main-sequence star, an orange dwarf,[6] with a stellar classification of K2 V.[3] This is a quiescent solar-type star that displays no significant magnetic activity in its chromosphere[9] and is spinning slowly with a rotation period of roughly 44 days.[6] The abundance of iron in the star is much higher than in the Sun, an indicator that it is metal-rich.[6] It has 83% of the mass of the Sun and 79% of the Sun's radius. The star is radiating 33% of the luminosity of the Sun from its photosphere at an effective temperature of 4,923 K.[7]

  1. ^ a b c d 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 Gaia DR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference SIMBAD 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 Cite error: The named reference Moutou2005 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa535_A42 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Trifonov2017 was invoked but never defined (see the help page).