Iota Tucanae

Iota Tucanae
	File:IotaTucLightCurve.png; A light curve for Iota Tucanae, plotted from Hipparcos data
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Tucana
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+5.33
Characteristics
Spectral type	G5 III
B−V Template:Engvar	+0.89
Variable type	SRV
Astrometry
Radial velocity (Rv)	−7.80 km/s
Proper motion (μ)	RA: +73.80 mas/yr ; Dec.: −11.55 mas/yr
Parallax (π)	10.72±0.23 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	0.70
Details
Mass	2.20 Template:Solar mass
Radius	11 Template:Solar radius
Luminosity	65 Template:Solar luminosity
Surface gravity (log g)	Script error: No such module "val". cgs
Temperature	Script error: No such module "val". K
Metallicity [Fe/H]	Script error: No such module "val". dex
Rotational velocity (v sin i)	Script error: No such module "val". km/s
Age	1.69 Gyr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
	ι Tuc, CPD−62°89, FK5 39, HD 6793, HIP 5268, HR 332, SAO 248324
Database references
SIMBAD	data

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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] The variability of the brightness of Iota Tucanae was discovered when the Hipparcos data was analyzed.^[11] It is classified as a semiregular variable star, showing a periodicity of 66.8 days with an amplitude of 0.0202 in visual magnitude.^[12] Iota Tucanae is an X-ray source with a luminosity of Script error: No such module "val"..^[13] 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]

References

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
File:IotaTucLightCurve.png A light curve for Iota Tucanae, plotted from Hipparcos data^[1]
Constellation	Tucana
Right ascension	Template:RA^[2]
Declination	Template:DEC^[2]
Apparent magnitude (V)	+5.33^[3]
Characteristics
Spectral type	G5 III^[4]
B−V Template:Engvar	+0.89^[3]
Variable type	SRV^[5]
Astrometry

Radial velocity (R_v)	−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	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (M_V)	0.70^[6]

Details

Mass	2.20^[5] Template:Solar mass
Radius	11^[7] Template:Solar radius
Luminosity	65^[5] Template:Solar luminosity
Surface gravity (log g)	Script error: No such module "val".^[8] cgs
Temperature	Script error: No such module "val".^[5] K
Metallicity [Fe/H]	Script error: No such module "val".^[8] dex
Rotational velocity (v sin i)	Script error: No such module "val".^[6] km/s
Age	1.69^[5] Gyr

Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
ι Tuc, CPD−62°89, FK5 39, HD 6793, HIP 5268, HR 332, SAO 248324^[9]
Database references
SIMBAD	data