Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Tucana |
Right ascension | 01h 07m 18.66365s [2] |
Declination | −61° 46′ 31.0434″ [2] |
Apparent magnitude (V) | +5.33 [3] |
Characteristics | |
Spectral type | G5 III [4] |
B−V color index | +0.89 [3] |
Variable type | SRV [5] |
Astrometry | |
Radial velocity (Rv) | −7.80 [5] km/s |
Proper motion (μ) |
RA: +73.80
[2]
mas/
yr Dec.: −11.55 [2] mas/ yr |
Parallax (π) | 10.72 ± 0.23 mas [2] |
Distance | 304 ± 7
ly (93 ± 2 pc) |
Absolute magnitude (MV) | 0.70 [6] |
Details | |
Mass | 2.20 [5] M☉ |
Radius | 11 [7] R☉ |
Luminosity | 65 [5] L☉ |
Surface gravity (log g) | 3.15±0.13 [8] cgs |
Temperature | 5,039±63 [5] K |
Metallicity [Fe/H] | −0.02±0.08 [8] dex |
Rotational velocity (v sin i) | 5.8±3.5 [6] km/s |
Age | 1.69 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Iota Tucanae (ι Tuc, ι Tucanae) is a solitary [10] star in the southern constellation of Tucana. Based upon an annual parallax shift of 10.72 mas as seen from Earth, [2] it is located around 304 light years from the Sun. With an apparent visual magnitude of +5.33, [3] it is faintly visible to the naked eye.
This is a yellow-hued G-type giant star with a stellar classification of G5 III. [4] It is classified as a semiregular variable star, showing a periodicity of 66.8 days with an amplitude of 0.0202 in visual magnitude. [11] Iota Tucanae is an X-ray source with a luminosity of 817.6×1028 erg s−1. [12] It has an estimated 2.2 [5] times the mass of the Sun, and, at the age of 1.69 billion years, [5] it has evolved away from the main sequence, expanding to 11 [7] times the Sun's radius. The star radiates 65 [5] times the solar luminosity from its photosphere at an effective temperature of 5,039 K. [5]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Tucana |
Right ascension | 01h 07m 18.66365s [2] |
Declination | −61° 46′ 31.0434″ [2] |
Apparent magnitude (V) | +5.33 [3] |
Characteristics | |
Spectral type | G5 III [4] |
B−V color index | +0.89 [3] |
Variable type | SRV [5] |
Astrometry | |
Radial velocity (Rv) | −7.80 [5] km/s |
Proper motion (μ) |
RA: +73.80
[2]
mas/
yr Dec.: −11.55 [2] mas/ yr |
Parallax (π) | 10.72 ± 0.23 mas [2] |
Distance | 304 ± 7
ly (93 ± 2 pc) |
Absolute magnitude (MV) | 0.70 [6] |
Details | |
Mass | 2.20 [5] M☉ |
Radius | 11 [7] R☉ |
Luminosity | 65 [5] L☉ |
Surface gravity (log g) | 3.15±0.13 [8] cgs |
Temperature | 5,039±63 [5] K |
Metallicity [Fe/H] | −0.02±0.08 [8] dex |
Rotational velocity (v sin i) | 5.8±3.5 [6] km/s |
Age | 1.69 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Iota Tucanae (ι Tuc, ι Tucanae) is a solitary [10] star in the southern constellation of Tucana. Based upon an annual parallax shift of 10.72 mas as seen from Earth, [2] it is located around 304 light years from the Sun. With an apparent visual magnitude of +5.33, [3] it is faintly visible to the naked eye.
This is a yellow-hued G-type giant star with a stellar classification of G5 III. [4] It is classified as a semiregular variable star, showing a periodicity of 66.8 days with an amplitude of 0.0202 in visual magnitude. [11] Iota Tucanae is an X-ray source with a luminosity of 817.6×1028 erg s−1. [12] It has an estimated 2.2 [5] times the mass of the Sun, and, at the age of 1.69 billion years, [5] it has evolved away from the main sequence, expanding to 11 [7] times the Sun's radius. The star radiates 65 [5] times the solar luminosity from its photosphere at an effective temperature of 5,039 K. [5]