Theta Normae

Theta Normae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Norma
Right ascension 16h 15m 15.31780s[1]
Declination −47° 22′ 19.2677″[1]
Apparent magnitude (V) 5.13[2]
Characteristics
Spectral type B8 V[3]
B−V color index −0.12[2]
Astrometry
Radial velocity (Rv)+1.4±4.2[4] km/s
Proper motion (μ) RA: −34.39[1] mas/yr
Dec.: −44.88[1] mas/yr
Parallax (π)8.46 ± 0.26[1] mas
Distance390 ± 10 ly
(118 ± 4 pc)
Absolute magnitude (MV)−1.60
Details
Luminosity184[5] L☉
Temperature12,341[5] K
Other designations
θ Nor, CPD−47° 10611, HD 145842, HIP 79653, HR 6045, SAO 226600[6]
Database references
SIMBADdata

θ Normae, Latinised as Theta Normae, is a solitary,[7] blue-white hued star in the constellation Norma. It has an apparent visual magnitude of 5.13[2] and thus is faintly visible to the naked eye. Based upon an annual parallax shift of 8.46 mas as seen from Earth,[1] this system is located about 390 light years from the Sun. At that distance, the visual magnitude of these stars is diminished by an extinction factor of 0.45 due to interstellar dust.[8] Theta Normae is a B-type main-sequence star with a stellar classification of B8 V.[3] It radiates about 184 times the Sun's luminosity from its photosphere at an effective temperature of 12,341 K.[5]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 Freely accessible, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  3. 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 Freely accessible, doi:10.1051/0004-6361/201219219, A61.
  5. 1 2 3 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x.
  6. ↑ "tet Nor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.
  7. ↑ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.
  8. ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694−706, Bibcode:2012AstL...38..694G, arXiv:1606.09028 Freely accessible, doi:10.1134/S1063773712110035.
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