Eta Normae

Eta Normae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Norma
Right ascension 16h 03m 12.89783s[1]
Declination −49° 13′ 46.9151″[2]
Apparent magnitude (V) 4.65[3]
Characteristics
Spectral type G8III[4]
U−B color index +0.64[3]
B−V color index +0.92[3]
Astrometry
Radial velocity (Rv)−0.3±2.8[5] km/s
Proper motion (μ) RA: 42.05[1] mas/yr
Dec.: 9.14[1] mas/yr
Parallax (π)14.86 ± 0.25[1] mas
Distance219 ± 4 ly
(67 ± 1 pc)
Absolute magnitude (MV)0.524[6]
Details
Mass2.78[6] M☉
Luminosity67[7] L☉
Surface gravity (log g)2.84[6] cgs
Temperature4,977[6] K
Metallicity [Fe/H]−0.05[6] dex
Other designations
η Nor, CD−48° 10512, HD 143546, HIP 78639, HR 5962, SAO 226466[2]
Database references
SIMBADdata

Eta Normae (η Normae) is a yellow-hued star in the constellation Norma. Its apparent magnitude is 4.65. Located between 215 and 223 light-years distant, it is a red clump[6] giant of spectral type G8III that has swollen and cooled off the main sequence. It shines with a luminosity approximately 67[7] times that of the Sun and has a surface temperature of 4,977 K.[6]

References

  1. 1 2 3 4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 "eta Nor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.
  3. 1 2 3 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
  4. ↑ 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.
  5. ↑ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. 1 2 3 4 5 6 7 Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
  7. 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.