Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydrus |
Right ascension | 02h 50m 28.45915s [1] |
Declination | −75° 04′ 00.9969″ [1] |
Apparent magnitude (V) | 4.76 [2] |
Characteristics | |
Spectral type | K3III [3] |
U−B color index | +1.56 [4] |
B−V color index | +1.33 [4] |
Astrometry | |
Radial velocity (Rv) | +3.09±0.16 [1] km/s |
Proper motion (μ) |
RA: −33.392
[1]
mas/
yr Dec.: −27.286 [1] mas/ yr |
Parallax (π) | 9.8538 ± 0.1433 mas [1] |
Distance | 331 ± 5
ly (101 ± 1 pc) |
Absolute magnitude (MV) | −0.33 [2] |
Details | |
Mass | 3.5 [5] or 1.79 [6] M☉ |
Radius | 21.23+3.23 −4.50 [1] R☉ |
Luminosity | 183.8±3.2 [1] L☉ |
Surface gravity (log g) | 3.30 [7] cgs |
Temperature | 4,612+584 −315 [1] K |
Metallicity [Fe/H] | −1.52 [7] dex |
Rotation | 50 d [5] |
Rotational velocity (v sin i) | 1.3 [8] km/s |
Age | 2.38 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ν Hydri, Latinized as Nu Hydri, is a single [10] star in the southern circumpolar constellation of Hydrus. It is orange-hued and faintly visible to the naked eye with an apparent visual magnitude of 4.76. [2] This object is located approximately 331 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +3 km/s. [1] It is a member of the Ursa Major Moving Group of stars that share a common motion through space. [11]
This is an aging giant star with a stellar classification of K3III. [3] With the supply of hydrogen at its core exhausted, the star has expanded and cooled. At present it has 21 [1] times the girth of the Sun. It is 2.4 [6] billion years old with estimates of its mass ranging from 1.8 [6] to 3.5 [5] times the mass of the Sun. The star is radiating 184 [1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,612 K. [1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydrus |
Right ascension | 02h 50m 28.45915s [1] |
Declination | −75° 04′ 00.9969″ [1] |
Apparent magnitude (V) | 4.76 [2] |
Characteristics | |
Spectral type | K3III [3] |
U−B color index | +1.56 [4] |
B−V color index | +1.33 [4] |
Astrometry | |
Radial velocity (Rv) | +3.09±0.16 [1] km/s |
Proper motion (μ) |
RA: −33.392
[1]
mas/
yr Dec.: −27.286 [1] mas/ yr |
Parallax (π) | 9.8538 ± 0.1433 mas [1] |
Distance | 331 ± 5
ly (101 ± 1 pc) |
Absolute magnitude (MV) | −0.33 [2] |
Details | |
Mass | 3.5 [5] or 1.79 [6] M☉ |
Radius | 21.23+3.23 −4.50 [1] R☉ |
Luminosity | 183.8±3.2 [1] L☉ |
Surface gravity (log g) | 3.30 [7] cgs |
Temperature | 4,612+584 −315 [1] K |
Metallicity [Fe/H] | −1.52 [7] dex |
Rotation | 50 d [5] |
Rotational velocity (v sin i) | 1.3 [8] km/s |
Age | 2.38 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ν Hydri, Latinized as Nu Hydri, is a single [10] star in the southern circumpolar constellation of Hydrus. It is orange-hued and faintly visible to the naked eye with an apparent visual magnitude of 4.76. [2] This object is located approximately 331 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +3 km/s. [1] It is a member of the Ursa Major Moving Group of stars that share a common motion through space. [11]
This is an aging giant star with a stellar classification of K3III. [3] With the supply of hydrogen at its core exhausted, the star has expanded and cooled. At present it has 21 [1] times the girth of the Sun. It is 2.4 [6] billion years old with estimates of its mass ranging from 1.8 [6] to 3.5 [5] times the mass of the Sun. The star is radiating 184 [1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,612 K. [1]