Gliese 393

Gliese 393 is a red dwarf star in the constellation Sextans. At apparent magnitude 9.65, it is much too faint to be seen with the unaided eye. A small star, it has around 41% the mass and radius of the Sun, but only 2.35% its luminosity.[1]

Gliese 393
Observation data
Epoch J2000      Equinox J2000
Constellation Sextans
Right ascension  10h 28m 55.55087s
Declination +00° 50′ 27.6218″
Apparent magnitude (V) 9.65
Characteristics
Spectral type M2.5V
Astrometry
Radial velocity (Rv)-8.34 ± 0.1 km/s
Proper motion (μ) RA: 603.75 ± 1.90 mas/yr
Dec.: -728.94 ± 2.04 mas/yr
Parallax (π)141.50 ± 2.22 mas
Distance23.0 ± 0.4 ly
(7.1 ± 0.1 pc)
Details
Mass0.41[1] M☉
Radius0.41[1] R☉
Luminosity0.0235[1] L☉
Temperature3544 ± 68[1] K
Metallicity-0.11 ± 0.04[1]
Other designations
HIP 51317, LTT 12805
Database references
SIMBADdata

Planetary System

In 2019 one candidate planet been detected by the radial velocity method.[2]

The Gliese 393 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.9+1.1
−1.0 M⊕		 0.055+0.005
−0.006		 7.0269+0.0034
−0.0041		 0.03+0.21
−0.03		 — —
gollark: I'll notify the POTAT-O5 Council.
gollark: > I wonder whether this happened because of an apiological thing which I did.<@319753218592866315> Probably.
gollark: Hello, boi!
gollark: As of now calls form a directed graph. However, they COULD form an undirected hypergraph.
gollark: Not sure how the UI should vary for "connect to multiserver call" versus "connect new call to server" but oh well.

References
  1. Maldonado, J.; Affer, L.; Micela, G.; Scandariato, G.; Damasso, M.; Stelzer, B.; Barbieri, M.; Bedin, L. R.; Biazzo, K.; Bignamini, A.; Borsa, F.; Claudi, R. U.; Covino, E.; Desidera, S.; Esposito, M.; Gratton, R.; González Hernández, J. I.; Lanza, A. F.; Maggio, A.; Molinari, E.; Pagano, I.; Perger, M.; Pillitteri, I.; Piotto, G.; Poretti, E.; Prisinzano, L.; Rebolo, R.; Ribas, I.; Shkolnik, E.; Southworth, J.; Sozzetti, A.; Suárez Mascareño, A. (2015). "Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths". Astronomy & Astrophysics. 577: 13. arXiv:1503.03010. Bibcode:2015A&A...577A.132M. doi:10.1051/0004-6361/201525797. A132.
  2. Barnes, J. R.; et al. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644.


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