Gliese 521
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canes Venatici[1] |
| Right ascension | 13h 39m 24.10228s[2] |
| Declination | +46° 11′ 11.3631″[2] |
| Apparent magnitude (V) | +10.26[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | M1V[4] |
| Apparent magnitude (J) | 7.05[3] |
| Apparent magnitude (H) | 6.51[3] |
| Apparent magnitude (K) | 6.26[3] |
| Astrometry | |
| Radial velocity (Rv) | −65.72±0.15[2] km/s |
| Proper motion (μ) | RA: −42.332±0.012 mas/yr[2] Dec.: 389.167±0.014 mas/yr[2] |
| Parallax (π) | 74.7985±0.0153 mas[2] |
| Distance | 43.605 ± 0.009 ly (13.369 ± 0.003 pc) |
| Absolute magnitude (MV) | 10.243[5] |
| Details | |
| Mass | 0.506±0.021 M☉[3] 0.47±0.05[6] M☉ |
| Radius | 0.619±0.030 R☉[5] 0.47±0.05[6] R☉ |
| Luminosity | 0.033+0.008 −0.007[6] L☉ |
| Surface gravity (log g) | 4.79±0.04[6] cgs |
| Temperature | 3,493±50[5] K |
| Metallicity [Fe/H] | −0.34 dex[3] −0.09±0.09[6] dex |
| Rotation | 49.5±3.5 d[7] |
| Rotational velocity (v sin i) | 0.85[5] 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[8] | |
| Database references | |
| SIMBAD | data |
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.[5] It is predicted to come as close as 15.70 light-years from the Sun in 176,900 years.[9] This star is too faint to be visible to the naked eye, having an apparent visual magnitude of +10.26[3] and an absolute magnitude of 10.24.[5]
The primary is an M-type main-sequence star with a stellar classification of M1V.[4] 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[5] and a rotation period of roughly 49.5 days.[7] The star has a lower metal-content compared to the Sun. It is radiating just 3%[6] of the luminosity of the Sun from its photosphere at an effective temperature of 3,493 K.[5]
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.[10]
