GJ 3293

GJ 3293

Observation data Epoch J2000      Equinox J2000
Constellation	Eridanus[1]
Right ascension	04^h 28^m 35.71911^s[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 mas/yr[2] Dec.: −485.454 mas/yr[2]
Parallax (π)	49.4868 ± 0.0227 mas[2]
Distance	65.91 ± 0.03 ly (20.207 ± 0.009 pc)
Absolute magnitude (MV)	10.66[1]
Details
Mass	0.420[1] M☉
Radius	0.40 ± 0.03[1] R☉
Luminosity	0.022[1] L☉
Temperature	3466 ± 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
SIMBAD	data
ARICNS	data

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 04^h 28^m 35.71911^s, 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. Astudillo-Defru, Nicola; Bonfils, Xavier; Delfosse, Xavier; Ségransan, Damien; Forveille, Thierry; Bouchy, François; Gillon, Michaël; Lovis, Christophe; Mayor, Michel; Neves, Vasco; Pepe, Francesco; Perrier, Christian; Queloz, Didier; Rojo, Patricio; Santos, Nuno C.; Udry, Stéphane (2015). "Planetary systems and stellar activity of the M dwarfs GJ 3293, GJ 3341, and GJ 3543". Astronomy & Astrophysics. 575: A119. arXiv:1411.7048v1. Bibcode:2015A&A...575A.119A. doi:10.1051/0004-6361/201424253. S2CID 67754095.
2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
3. "Gliese 3293", Open Exoplanet Catalogue, MIT, retrieved 2016-08-11
4. Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D.; Le Campion, J. -F.; Marchal, O.; Hestroffer, D.; Thévenin, F.; Crifo, F.; Udry, S.; Cropper, M.; Seabroke, G.; Viala, Y.; Benson, K.; Blomme, R.; Jean-Antoine, A.; Huckle, H.; Smith, M.; Baker, S. G.; Damerdji, Y.; Dolding, C.; Frémat, Y.; Gosset, E.; Guerrier, A.; Guy, L. P.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 247759802.
5. "GJ 3293 -- High proper-motion Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-08
6. 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. arXiv:1703.05386. Bibcode:2017A&A...602A..88A. doi:10.1051/0004-6361/201630153. S2CID 119418595.