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Iota Crucis, Latinized from ι Crucis, is a star in the constellation Crux. It has an apparent magnitude of 4.69m. The star is classified as an orange giant (spectral class K1 III). Iota Crucis is located at 125 light-years from the Sun.

Iota Crucis
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension  12h 45m 38.05214s[1]
Declination −60° 58′ 52.7435″[1]
Apparent magnitude (V) 4.693[2]
Spectral type K0 III[2]
U−B color index +0.93[3]
B−V color index +1.05[3]
Radial velocity (Rv)+7.1[4] km/s
Proper motion (μ) RA: 112.93[1] mas/yr
Dec.: −64.62[1] mas/yr
Parallax (π)27.17 ± 0.24[1] mas
Distance120 ± 1 ly
(36.8 ± 0.3 pc)
Absolute magnitude (MV)+1.86[5]
Luminosity22.8[5] L
Surface gravity (log g)2.79±0.22 cgs
Temperature4,824±44[6] K
Metallicity [Fe/H]+0.07±0.03 dex
Other designations
ι Cru, CPD–60° 4273, HD 110829, HIP 62268, HR 4842, SAO 252016[2]
Database references

There is a nearby 10.3m class G8 star, but the highly different proper motion reveals it to be a mere line-of-sight optical companion.[citation needed]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c "iot Cru -- Star in double system". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-04-06.
  3. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J.
  4. ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E.
  5. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. ^ Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189.