Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Capricornus |
Right ascension | 20h 37m 21.20s [1] |
Declination | −15° 08′ 50.4″ [1] |
Apparent magnitude (V) | +6.76 [2] |
Characteristics | |
Spectral type | K1 III [3] |
U−B color index | +1.23 [4] |
B−V color index | +1.26 [4] |
Astrometry | |
Radial velocity (Rv) | 18.5 ± 3 [5] km/s |
Proper motion (μ) |
RA: 61.508
[1]
mas/
yr Dec.: −47.081 [1] mas/ yr |
Parallax (π) | 4.3504 ± 0.0229 mas [1] |
Distance | 750 ± 4
ly (230 ± 1 pc) |
Absolute magnitude (MV) | −0.27 [2] |
Details | |
Mass | 1.18 [6] M☉ |
Radius | 25 [7] R☉ |
Luminosity | 191 [7] L☉ |
Surface gravity (log g) | 1.81 [6] cgs |
Temperature | 4,272 [6] K |
Metallicity [Fe/H] | −0.02 [6] dex |
Other designations | |
Database references | |
SIMBAD | data |
Tau1 Capricorni (τ1 Cap, τ1 Capricorni) is a star in the constellation Capricornus. It has an apparent magnitude of 6.76, [2] making it readily visible in binoculars, but not to the naked eye. Located approximately 750 light years from Earth, [1] the star is receding with a heliocentric radial velocity of 18.5 km/s. [5] Due to its location near the ecliptic, τ1 Cap can be occulted by the Moon and rarely planets. [8]
τ1 Capricorni has a stellar classification of K1 III, indicating that it is an ageing K-type giant. [3] At present it has 118% the mass of the Sun [6] and an enlarged radius of 25 solar radii. [7] It shines at 191 times the luminosity of the Sun [7] from its photosphere at an effective temperature of 4272 K. [6] τ1 Cap's metallicity – elements heavier than helium – is at solar level. [6]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Capricornus |
Right ascension | 20h 37m 21.20s [1] |
Declination | −15° 08′ 50.4″ [1] |
Apparent magnitude (V) | +6.76 [2] |
Characteristics | |
Spectral type | K1 III [3] |
U−B color index | +1.23 [4] |
B−V color index | +1.26 [4] |
Astrometry | |
Radial velocity (Rv) | 18.5 ± 3 [5] km/s |
Proper motion (μ) |
RA: 61.508
[1]
mas/
yr Dec.: −47.081 [1] mas/ yr |
Parallax (π) | 4.3504 ± 0.0229 mas [1] |
Distance | 750 ± 4
ly (230 ± 1 pc) |
Absolute magnitude (MV) | −0.27 [2] |
Details | |
Mass | 1.18 [6] M☉ |
Radius | 25 [7] R☉ |
Luminosity | 191 [7] L☉ |
Surface gravity (log g) | 1.81 [6] cgs |
Temperature | 4,272 [6] K |
Metallicity [Fe/H] | −0.02 [6] dex |
Other designations | |
Database references | |
SIMBAD | data |
Tau1 Capricorni (τ1 Cap, τ1 Capricorni) is a star in the constellation Capricornus. It has an apparent magnitude of 6.76, [2] making it readily visible in binoculars, but not to the naked eye. Located approximately 750 light years from Earth, [1] the star is receding with a heliocentric radial velocity of 18.5 km/s. [5] Due to its location near the ecliptic, τ1 Cap can be occulted by the Moon and rarely planets. [8]
τ1 Capricorni has a stellar classification of K1 III, indicating that it is an ageing K-type giant. [3] At present it has 118% the mass of the Sun [6] and an enlarged radius of 25 solar radii. [7] It shines at 191 times the luminosity of the Sun [7] from its photosphere at an effective temperature of 4272 K. [6] τ1 Cap's metallicity – elements heavier than helium – is at solar level. [6]