Iota Trianguli

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Iota Trianguli
Triangulum IAU.svg
Red circle.svg
Location of ι Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum
Right ascension 02h 12m 22.28003s[1]
Declination +30° 18′ 11.0430″[1]
Apparent magnitude (V) +4.952[2] (5.32 + 6.83)[3]
Spectral type G0 III + G5 III[4] + F5V + ?[3]
U−B color index +0.307[2]
B−V color index +0.789[2]
Proper motion (μ) RA: −65.05[1] mas/yr
Dec.: −60.50[1] mas/yr
Parallax (π) 11.22 ± 0.70[1] mas
Distance 290 ± 20 ly
(89 ± 6 pc)
Absolute magnitude (MV) +0.20[5]
Luminosity 84[5] L
Metallicity [Fe/H] −0.48[5] dex
Other designations
TZ Tri, ι Tri, 6 Tri, BD+29° 371, HD 13480, HIP 10280, HR 642, SAO 55347, WDS J02124+3018[6]
Database references

Iota Trianguli, Latinized from ι Trianguli, is quadruple[3] star system in constellation of Triangulum. It is approximately 290 light years from Earth.

Both components of ι Trianguli are spectroscopic binaries and the brighter pair is variable. It has been given the variable star designation TZ Trianguli. The variations are due to the ellipsoidal shape of the stars as they rotate, and also it is classified as an RS Canum Venaticorum variable.[7]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R. 
  3. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  4. ^ Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal, 74: 916–919, Bibcode:1969AJ.....74..916H, doi:10.1086/110881. 
  5. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ "iot Tri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30. 
  7. ^ Hall, D. S.; et al. (1980), "6 iota Trianguli: A new variable star", Information Bulletin on Variable Stars, 1764: 1, Bibcode:1980IBVS.1764....1H. 

External links[edit]

  • Kaler, James B., "6 Trianguli", Stars, University of Illinois, retrieved 2017-07-01.