Theta1 Crucis

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Theta1 Crucis
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 03m 01.5010s[1]
Declination −63° 18′ 46.548″[1]
Apparent magnitude (V) 4.30
Spectral type Am
U−B color index +0.04[2]
B−V color index +0.27[2]
Radial velocity (Rv) −2.4[3] km/s
Proper motion (μ) RA: −152.53[1] mas/yr
Dec.: 6.10[1] mas/yr
Parallax (π) 14.19 ± 0.54[1] mas
Distance 230 ± 9 ly
(70 ± 3 pc)
Other designations
HR 4599, HD 104671, SAO 251705, HIP 58758.[4]

Theta1 Crucis1 Cru, Theta1 Crucis) is a spectroscopic binary star in the constellation Crux. It has an apparent magnitude of 4.32m. The spectral class of the star is Am. Theta1 Crucis is located at 230 light-years from the Sun.


  1. ^ a b c d e Perryman, M. A. C. et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ a b Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J. 
  3. ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495..... 
  4. ^ "HR 4599 -- Spectroscopic binary". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2007-01-04.