HD 86226

HD 86226
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra
Right ascension 09h 56m 29.844s[1]
Declination –24° 05′ 57.80″[1]
Apparent magnitude (V) 7.93[2]
Characteristics
Spectral type G2V[3]
Apparent magnitude (B) 8.577[2]
Apparent magnitude (R) 7.71[2]
Apparent magnitude (J) 6.839±0.019[2]
Apparent magnitude (H) 6.577±0.034[2]
Apparent magnitude (K) 6.463±0.023[2]
B−V color index 0.647±0.014[2]
V−R color index 0.22[4]
Astrometry
Radial velocity (Rv)+19.56±0.19[4] km/s
Proper motion (μ) RA: –177.127 mas/yr[1]
Dec.: +47.099 mas/yr[1]
Parallax (π)21.9301 ± 0.0267 mas[1]
Distance148.7 ± 0.2 ly
(45.60 ± 0.06 pc)
Absolute magnitude (MV)4.66[2]
Details[5]
Mass1.019+0.061
−0.066 M☉
Radius1.053+0.026
−0.026 R☉
Luminosity1.180+0.036
−0.029 L☉
Surface gravity (log g)4.400+0.029
−0.032 cgs
Temperature5863±88 K
Metallicity [Fe/H]0.018+0.057
−0.043 dex
Rotational velocity (v sin i)3.6[6] km/s
Age4.6+3.7
−2.7 Gyr
Other designations
CD–23°8866, HD 86226, HIP 48739, SAO 178205, PPM 256971[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93,[2] it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s.[4] A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units.[8]

This is an ordinary G-type main-sequence star with a stellar classification of G2V.[3] It is similar in size, mass, and composition to the Sun,[5] although it isn't considered a solar twin.[9] The age is about the same; roughly 4.6 billion years old. The star is radiating 18% greater luminosity (compared to the Sun) from its photosphere at an effective temperature of 5,863 K.[5] It is spinning with a projected rotational velocity of 3.6 km/s.[6]

As of 2014, Radio emission at a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source.[10]

  1. ^ a b c d 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 Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk_Smith-Moore_1978 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Teske2020 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Llorente_de_Andrés_et_al_2021 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 Mugrauer_Ginski_2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Datson_et_al_2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Sirothia_et_al_2014 was invoked but never defined (see the help page).