Gliese 521

Gliese 521 is a red dwarf star in the constellation of Canes Venatici, located roughly 43 light years from the Sun. The star is suspected to host a substellar companion yet unconfirmed.

Gliese 806
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici
Right ascension  13h 29m 24.10s
Declination +46° 11′ 11.37″
Apparent magnitude (V) +10.26
Characteristics
Spectral type M1V
Astrometry
Distance43.22 ly
(13.26 pc)
Details
Mass0.56 M☉
Radius0.48 R☉
Luminosity0.041 L☉
Temperature3740 K
Other designations
HIP 66625, GJ 521, TYC 3463-00063-1, BD+46 1889, 2MASS J13392410+4611114
Database references
SIMBADdata

A planetary companion?

According to Marcy & Benitz (1989)[1] detected a possible periodicity of 510 days, inferring possible presence of a massive planetary object with minimum mass of 12 times that of Jupiter in highly eccentric orbit (e=0.6). So far the planet has not been confirmed.

The Gliese 521 planetary system[1]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) ≥12 MJ 1.038 510 0.6 — —
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References
  1. Marcy & Benitz; Benitz, Karsten J. (1989). "A search for substellar companions to low-mass stars". Astrophysical Journal, Part 1. 344 (1): 441–453. Bibcode:1989ApJ...344..441M. doi:10.1086/167812.


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