Gliese 3293

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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]
Database references
SIMBADdata
ARICNSdata

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]

Planetary system[edit]

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

References[edit]

  1. ^ a b c d e f g h i j k l 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. ^ a b c "Gliese 3293", Open Exoplanet Catalogue, MIT, retrieved 2016-08-11
  3. ^ a b "GJ 3293 -- High proper-motion Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-08
  4. ^ a b "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).

Coordinates: Sky map 04h 28m 37.08s, −25° 10′ 25.6″