Gliese 393

Gliese 393
Observation data
Epoch J2000      Equinox J2000
Constellation Sextans
Right ascension 10h 28m 55.551s[1]
Declination +00° 50′ 27.60″[1]
Apparent magnitude (V) 9.65[2]
Characteristics
Spectral type M2V[3]
U−B color index 1.192[2]
B−V color index 1.507±0.014[2]
Astrometry
Radial velocity (Rv)+8.34±0.10[2] km/s
Proper motion (μ) RA: −602.992 mas/yr[1]
Dec.: −731.882 mas/yr[1]
Parallax (π)142.0951 ± 0.0212 mas[1]
Distance22.953 ± 0.003 ly
(7.038 ± 0.001 pc)
Absolute magnitude (MV)10.40[2]
Details[3]
Mass0.432±0.011 M☉
Radius0.4459±0.0073 R☉
Luminosity0.02687±0.00054 L☉
Surface gravity (log g)4.88±0.07 cgs
Temperature3,579±51 K
Metallicity [Fe/H]−0.09±0.16 dex
Rotation34.15±0.22 d[4]
Rotational velocity (v sin i)1.5[5] km/s
Age3.28[4] Gyr
Other designations
BD+01°2447, GJ 393, HIP 51317, LTT 12805, 2MASS J10285555+0050275[6]
Database references
SIMBADdata

Gliese 393, or GJ 393, is a single[7] star with an orbiting exoplanet companion in the equatorial constellation of Sextans, positioned about 1.5° to the NNW of Beta Sextantis.[8] At an apparent visual magnitude of 9.65,[2] it is much too faint to be seen with the unaided eye. This star is located at a distance of 22.9 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +8.3 km/s.[2] It has a large proper motion, traversing the celestial sphere at the rate of 0.950″ per year.[9] The net velocity of this star relative to the Sun is 32.9 km/s.[2] It shares a similar space motion as members of the AB Doradus moving group, but is considered a random interloper.[5]

The stellar classification of GJ 393 is M2V,[3] indicating this is a small red dwarf star that is generating energy through core hydrogen fusion. It is rotating slowly and appears to be chromospherically inactive, suggesting it is an older star; perhaps as much as 10 billion years old.[5] The star has 43% of the mass of the Sun and 44.6% of the Sun's radius. The metallicity, what astronomers term the abundance of heavy elements, is lower than in the Sun. It is radiating just 2.7% of the Sun's luminosity from its photosphere at an effective temperature of 3,579 K.[3]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ 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).
  3. ^ a b c d Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Engle_Guinan_2023 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Schaefer2018 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Winters_et_al_2019 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Lepine_Shara_2005 was invoked but never defined (see the help page).