Gliese 521

Gliese 521
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici
Right ascension 13h 39m 24.10228s[1]
Declination +46° 11′ 11.3631″[1]
Apparent magnitude (V) +10.26[2]
Characteristics
Spectral type M1V[3]
Apparent magnitude (J) 7.05[2]
Apparent magnitude (H) 6.51[2]
Apparent magnitude (K) 6.26[2]
Astrometry
Radial velocity (Rv)−65.72±0.15[1] km/s
Proper motion (μ) RA: −42.332±0.012 mas/yr[1]
Dec.: 389.167±0.014 mas/yr[1]
Parallax (π)74.7985 ± 0.0153 mas[1]
Distance43.605 ± 0.009 ly
(13.369 ± 0.003 pc)
Absolute magnitude (MV)10.243[4]
Details
Mass0.506±0.021 M☉[2]
0.47±0.05[5] M☉
Radius0.619±0.030 R☉[4]
0.47±0.05[5] R☉
Luminosity0.033+0.008
−0.007[5] L☉
Surface gravity (log g)4.79±0.04[5] cgs
Temperature3,493±50[4] K
Metallicity [Fe/H]−0.34 dex[2]
−0.09±0.09[5] dex
Rotation49.5±3.5 d[6]
Rotational velocity (v sin i)0.85[4] km/s
Other designations
BD+46 1889, GJ 521, HIP 66625, SAO 44697, WDS 13394+4611, LTT 13979, TYC 3463-00063-1, 2MASS J13392410+4611114[7]
Database references
SIMBADdata

Gliese 521 is a double star in the northern constellation of Canes Venatici. The system is located at a distance of 43.6 light-years from the Sun based on parallax measurements, but is drawing closer with a radial velocity of −65.6 km/s.[4] It is predicted to come as close as 15.70 light-years from the Sun in 176,900 years.[8] This star is too faint to be visible to the naked eye, having an apparent visual magnitude of +10.26[2] and an absolute magnitude of 10.24.[4]

The primary is an M-type main-sequence star with a stellar classification of M1V.[3] It is only about half the size and mass of the Sun. The star is rotating slowly with a projected rotational velocity of 0.85 km/s[4] and a rotation period of roughly 49.5 days.[6] The star has a lower metal-content compared to the Sun. It is radiating just 3%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 3,493 K.[4]

A faint stellar companion was announced by E. Jódar and associates in 2013. The companion has an angular separation of 521 mas along a position angle of 352.1°±1.4° from the primary. This is equivalent to a projected separation of 7.24±0.14 AU.[9]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Jenkins_et_al_2006 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Alonso-Floriano_et_al_2015 was invoked but never defined (see the help page).
  4. ^ a b c d e f g h Cite error: The named reference Houdebine2010 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Maldonado_et_al_2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Suárez_Mascareño_et_al_2018 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Bailer-Jones2018 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Jódar_et_al_2013 was invoked but never defined (see the help page).