Iota Tucanae

Iota Tucanae

A light curve for Iota Tucanae, plotted from Hipparcos data[1]
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]
Distance304 ± 7 ly
(93 ± 2 pc)
Absolute magnitude (MV)0.70[6]
Details
Mass2.20[5] M☉
Radius11[7] R☉
Luminosity65[5] L☉
Surface gravity (log g)3.15±0.13[8] cgs
Temperature5,039±63[5] K
Metallicity [Fe/H]−0.02±0.08[8] dex
Rotational velocity (v sin i)5.8±3.5[6] km/s
Age1.69[5] Gyr
Other designations
ι Tuc, CPD−62° 89, FK5 39, HD 6793, HIP 5268, HR 332, SAO 248324[9]
Database references
SIMBADdata

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]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h i j Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference AmmlerVonEiff2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Alves2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference koen2002 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Pizzolato2000 was invoked but never defined (see the help page).