Gliese 3293

Gliese 3293 is a star in the constellation of Eridanus, that is orbited by four planets, two of which (Gliese 3293b/Gliese 3293d) are located within the star's habitable zone. It is located at the celestial coordinates: Right Ascension  04h 28m 35.72s, Declination −25° 10′ 08.9″.[1] With an apparent visual magnitude of 11.96,[3] this star is too faint to be seen with the naked eye. It can be viewed with a telescope having an aperture of at least 4 in (10 cm). The estimated distance to Gliese 3293 is 59 light-years (18 parsecs).[1] Gliese 3293 is significantly smaller and cooler than the Sun.[1]

Gliese 3293
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus[1]
Right ascension  04h 28m 35.72s
Declination −25° 10′ 08.9″
Apparent magnitude (V) 11.96[2]
Characteristics
Spectral type M2.5[2]
Astrometry
Parallax (π)55 ± 9[1] mas
Distanceapprox. 59 ly
(approx. 18 pc)
Absolute magnitude (MV)10.66[1]
Details
Mass0.420[1] M☉
Radius0.40 ± 0.03[1] R☉
Luminosity0.022[1] L☉
Temperature3466 ± 49[1] K
Metallicity [Fe/H]0.02 ± 0.09[1] dex
Rotational velocity (v sin i)−25.9 ± 6.6[1] km/s
Other designations
GJ 3293,[2] LHS 1672,[3] 2MASS J04283571-2510088, Gaia DR2 4893118771316702720
Database references
SIMBADdata
ARICNSdata

Planetary system

On November 15, 2017, it was discovered that Gliese 3293 possessed four planets, two of which were located well within the habitable zone: Gliese 3293b and Gliese 3293d.[4]

The Gliese 3293 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
e 3.28±064 M⊕ 0.08208 13.2543 0.21 — —
b 23.54 M⊕ 0.1434 30.6 0.06±0.04 — —
d 7.60±1.05 M⊕ 0.1939 48.14±0.12 0.12 — —
c 21.09 M⊕ 0.364 123.98 0.11 — —
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References
  1. Astudillo-Defru, N.; Bonfils, X.; Delfosse, X.; Ségransan, D.; Forveille, T.; Bouchy, F.; Gillon, M.; Lovis, C.; Mayor, M.; Neves, V.; Pepe, F.; Perrier, C.; Queloz, D.; Rojo, P.; Santos, N. C.; Udry, S. (2015). "Planetary systems and stellar activity of the M dwarfs GJ 3293, GJ 3341, and GJ 3543". Astronomy & Astrophysics. Astronomy & Astrophysics. 575: A119. arXiv:1411.7048v1. Bibcode:2015A&A...575A.119A. doi:10.1051/0004-6361/201424253.
  2. "Gliese 3293", Open Exoplanet Catalogue, MIT, retrieved 2016-08-11
  3. "GJ 3293 -- High proper-motion Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-08
  4. "The HARPS search for southern extra-solar planets XLI. A dozen planets around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and GJ 3293". N. Astudillo-Defru, T. Forveille, X. Bonfils, D. Ségransan, F. Bouchy, X. Delfosse, C. Lovis, M. Mayor, F. Murgas, F. Pepe, N. C. Santos, S. Udry, A. Wunsche (March 15, 2017).

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