Gliese 317

Gliese 317
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pyxis
Right ascension 08h 40m 59.2056s[1]
Declination −23° 27′ 22.5986″[1]
Apparent magnitude (V) 11.98[2]
Characteristics
Spectral type M2.5V[3]
V−R color index 0.338[2]
Astrometry
Radial velocity (Rv)87.8[3] km/s
Proper motion (μ) RA: −461.162±0.139 mas/yr[1]
Dec.: 805.571±0.126 mas/yr[1]
Parallax (π)65.7744 ± 0.0557 mas[1]
Distance49.59 ± 0.04 ly
(15.20 ± 0.01 pc)
Absolute magnitude (MV)11.06±0.04[3]
Details
Mass0.42±0.05[3] M☉
Radius0.4170±0.0013[4] R☉
Luminosity0.02175±0.00034[4] L☉
Temperature3,510±50[3] K
Metallicity [Fe/H]+0.3[3][5] dex
Rotation69 days[6]
Age~5[3] Gyr
Other designations
GJ 317, LFT 538, LHS 2037, LPM 296, LTT 3215[7]
Database references
SIMBADdata
Exoplanet Archivedata

Gliese 317 is a small red dwarf star with two exoplanetary companions[3][8] in the southern constellation of Pyxis. It is located at a distance of 49.6 light-years from the Sun based on parallax measurements,[1] and is drifting further away with a radial velocity of +87.8 km/s.[3] This star is too faint to be viewed with the naked eye, having an apparent visual magnitude of 11.98[2] and an absolute magnitude of 11.06.[3]

This is an M-type main-sequence star with a stellar classification of M2.5V.[3] Photometric calibrations and infrared spectroscopic measurements indicate that the star is enriched in heavy elements compared to the Sun.[5] The star is estimated to be roughly five billion years old and has a low activity level for a star of its class.[3] It has 42%[3][4] of the mass and radius of the Sun and is spinning with a rotation period of 69 days.[6] The star is radiating 2.2%[4] of the Sun's luminosity from its photosphere at an effective temperature of 3,510 K.[3]

  1. ^ a b c d e Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Zach2013 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k l m n Cite error: The named reference a12 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference m12 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Feng_et_al_2020 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 j07 was invoked but never defined (see the help page).