Theta Octantis

θ Octantis


Location of θ Octantis (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 00h 01m 35.70158s[1]
Declination −77° 03′ 56.6092″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Spectral type K3III[3]
U−B color index +1.41[4]
B−V color index +1.27[4]
Astrometry
Radial velocity (Rv)+22.60[5] km/s
Proper motion (μ) RA: -57.30[1] mas/yr
Dec.: -177.06[1] mas/yr
Parallax (π)15.02 ± 0.18[1] mas
Distance217 ± 3 ly
(66.6 ± 0.8 pc)
Absolute magnitude (MV)0.66[2]
Details
Mass1.20[6] M☉
Radius15[6] R☉
Luminosity86.72[2] L☉
Surface gravity (log g)2.16[6] cgs
Temperature4,200[7] K
Rotational velocity (v sin i)< 1.0[8] km/s
Other designations
FK5 904, GC 33321, HIP 122, HR 9084, HD 224889, SAO 258207
Database references
SIMBADdata

Theta Octantis (θ Oct) is a class K3III[3] (orange giant) star in the constellation Octans. Its apparent magnitude is 4.78[2] and it is approximately 217 light years away based on parallax.[1]

References

  1. 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971 Freely accessible. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. 1 2 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. 1 2 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. 1 2 3 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 Freely accessible. Vizier catalog entry
  7. ↑ Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785. Bibcode:2008AstL...34..785G. arXiv:1607.00619 Freely accessible. doi:10.1134/S1063773708110078. Vizier catalog entry
  8. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. Bibcode:2014A&A...561A.126D. arXiv:1312.3474 Freely accessible. doi:10.1051/0004-6361/201220762. Vizier catalog entry
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