Iota Volantis

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ι Volantis
Volans IAU.svg
Cercle rouge 100%.svg

Location of ι Volantis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Volans
Right ascension 06h 51m 26.98552s[1]
Declination −70° 57′ 48.2766″[1]
Apparent magnitude (V) 5.39[2]
Spectral type B7 III[3]
U−B color index −0.37[3]
B−V color index −0.12[3]
Radial velocity (Rv) 18.5[4] km/s
Proper motion (μ) RA: +3.64[1] mas/yr
Dec.: +26.08[1] mas/yr
Parallax (π) 5.79 ± 0.19[1] mas
Distance 560 ± 20 ly
(173 ± 6 pc)
Mass 3.72±0.06[5] M
Radius 4.7[6] R
Luminosity 313[5] L
Temperature 11,803[5] K
Rotational velocity (v sin i) 129[5] km/s
Other designations
ι Vol, CP−70° 572, FK5267 , HD 51557, HIP 32912, HR 2602, SAO 256344.[7]

Iota Volantis (ι Vol, ι Volantis) is the Bayer designation for a star in the southern constellation of Volans. It has an apparent visual magnitude of 5.39,[2] which indicates it is faintly visible to the naked eye. With a parallax of 0.00579, it lies at an estimated distance of roughly 560 light years from the Sun.[1]

This star has a stellar classification of B7 III,[3] which means it is a B-type giant star. However, some sources give it a classification of B7 IV, which would indicate it is a subgiant star. It has 3.7 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 129 km/s.[5] The estimated size of the star is 4.7 times the radius of the Sun,[6] and it shines with around 313 times the Sun's luminosity. The effective temperature of the star's outer atmosphere is 11,803 K,[5] giving it the blue-white hue of a B-type star.[8]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Cousins, A. W. J.; Stoy, R. H. (1962), "Photoelectric magnitudes and colours of Southern stars", Royal Observatory Bulletin, 64, Bibcode:1962RGOB...64..103C. 
  3. ^ a b c d Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 
  4. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", 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 c d e f Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052Freely accessible, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691. 
  6. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  7. ^ "iot Vol -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-05. 
  8. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16.