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] |
Distance | 43.605 ± 0.009
ly (13.369 ± 0.003 pc) |
Absolute magnitude (MV) | 10.243 [4] |
Details | |
Mass | 0.506±0.021 M☉
[2] 0.47±0.05 [5] M☉ |
Radius | 0.619±0.030 R☉
[4] 0.47±0.05 [5] R☉ |
Luminosity | 0.033+0.008 −0.007 [5] L☉ |
Surface gravity (log g) | 4.79±0.04 [5] cgs |
Temperature | 3,493±50 [4] K |
Metallicity [Fe/H] | −0.34 dex
[2] −0.09±0.09 [5] dex |
Rotation | 49.5±3.5 d [6] |
Rotational velocity (v sin i) | 0.85 [4] km/s |
Other designations | |
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. [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]
According to Marcy & Benitz (1989) [10] detected a possible periodicity of 510 days, inferring the 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. A radial velocity study of the star during the period 2013–2017 initially found a promising signal, but this disappeared when additional data was collected and was instead attributed to magnetic activity. [11]
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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] |
Distance | 43.605 ± 0.009
ly (13.369 ± 0.003 pc) |
Absolute magnitude (MV) | 10.243 [4] |
Details | |
Mass | 0.506±0.021 M☉
[2] 0.47±0.05 [5] M☉ |
Radius | 0.619±0.030 R☉
[4] 0.47±0.05 [5] R☉ |
Luminosity | 0.033+0.008 −0.007 [5] L☉ |
Surface gravity (log g) | 4.79±0.04 [5] cgs |
Temperature | 3,493±50 [4] K |
Metallicity [Fe/H] | −0.34 dex
[2] −0.09±0.09 [5] dex |
Rotation | 49.5±3.5 d [6] |
Rotational velocity (v sin i) | 0.85 [4] km/s |
Other designations | |
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. [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]
According to Marcy & Benitz (1989) [10] detected a possible periodicity of 510 days, inferring the 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. A radial velocity study of the star during the period 2013–2017 initially found a promising signal, but this disappeared when additional data was collected and was instead attributed to magnetic activity. [11]
{{
cite book}}
: |work=
ignored (
help)