Astronomy:GJ 3293

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Short description: Star in the constellation Eridanus
GJ 3293
Observation data
Equinox J2000.0]] (ICRS)
Constellation Eridanus[1]
Right ascension  04h 28m 35.71911s[2]
Declination −25° 10′ 09.2979″[2]
Apparent magnitude (V) 11.96[3]
Characteristics
Spectral type M2.5[3]
Astrometry
Radial velocity (Rv)13.116 ± 0.0024[4] km/s
Proper motion (μ) RA: −81.375[2] mas/yr
Dec.: −485.454[2] mas/yr
Parallax (π)49.4868 ± 0.0227[2] mas
Distance65.91 ± 0.03 ly
(20.207 ± 0.009 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,[3] LHS 1672,[5] 2MASS J04283571-2510088, Gaia DR2 4893118771316702720
Database references
SIMBADdata
ARICNSdata

GJ 3293 (sometimes Gliese 3293) is a star in the constellation of Eridanus, that is orbited by four planets, two of which (GJ 3293b & GJ 3293d) are located within the star's habitable zone. It is located at the celestial coordinates: Right Ascension  04h 28m 35.71911s, Declination −25° 10′ 09.2979″.[2] With an apparent visual magnitude of 11.96,[5] 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 GJ 3293 is 65.9 light-years (20.2 parsecs), based on its stellar parallax.[2] GJ 3293 is significantly smaller and cooler than the Sun.[1]

Planetary system

In 2015, it was discovered that GJ 3293 possessed two planets,[1] and in 2017 an additional two planets were discovered, making a total of four.[6] Two of these planets are located within the habitable zone: GJ 3293b and GJ 3293d.[6]

The GJ 3293 planetary system[6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
e ≥3.28±0.64 M 0.08208+0.00003
−0.00004
13.2543+0.0078
−0.0104
0.21+0.20
−0.14
b ≥23.54+0.88
−0.89
 M
0.14339±0.00003 30.5987+0.0083
−0.0084
0.06±0.04
d ≥7.60±1.05 M 0.19394+0.00017
−0.00018
48.1345+0.0628
−0.0661
0.12+0.13
−0.09
c ≥21.09+1.24
−1.26
 M
0.36175+0.00048
−0.00047
122.6196+0.2429
−0.2371
0.11+0.10
−0.08

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Astudillo-Defru, Nicola; Bonfils, Xavier; Delfosse, Xavier; Ségransan, Damien; Forveille, Thierry; Bouchy, François; Gillon, Michaël; Lovis, Christophe et al. (2015). "Planetary systems and stellar activity of the M dwarfs GJ 3293, GJ 3341, and GJ 3543". Astronomy & Astrophysics 575: A119. doi:10.1051/0004-6361/201424253. Bibcode2015A&A...575A.119A. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. 3.0 3.1 3.2 "Gliese 3293", Open Exoplanet Catalogue (MIT), http://www.openexoplanetcatalogue.com/planet/Gliese%203293%20b/, retrieved 2016-08-11 
  4. Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode2018A&A...616A...7S. 
  5. 5.0 5.1 "GJ 3293 -- High proper-motion Star", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=GJ%203293, retrieved 2011-12-08 
  6. 6.0 6.1 6.2 Astudillo-Defru, Nicola; Forveille, Thierry; Bonfils, Xavier; Ségransan, Damien; Bouchy, François; Delfosse, Xavier et al. (2017). "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". Astronomy and Astrophysics 602: A88. doi:10.1051/0004-6361/201630153. Bibcode2017A&A...602A..88A. https://www.aanda.org/articles/aa/full_html/2017/06/aa30153-16/aa30153-16.html. 

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