Gliese 521

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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
Spectral type M1V
Distance 43.22 ly
(13.26 pc)
Mass 0.56 M
Radius 0.48 R
Luminosity 0.041 L
Temperature 3740 K
Other designations
HIP 66625, GJ 521, TYC 3463-00063-1, BD+46 1889, 2MASS J13392410+4611114
Database references

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.

A planetary companion?[edit]

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]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b (unconfirmed) ≥12 MJ 1.038 510 0.6


  1. ^ a b 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.