Eta Octantis

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η Octantis
Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 10h 59m 13.76s[1]
Declination −84° 35′ 38.02″[1]
Apparent magnitude (V) 6.185±0.009[2]
Characteristics
Spectral type A1V[3]
U−B color index +0.12[4]
B−V color index +0.11[4]
Astrometry
Radial velocity (Rv)−47.69±0.02[5] km/s
Proper motion (μ) RA: −65.708±0.083[1] mas/yr
Dec.: −8.177±0.064[1] mas/yr
Parallax (π)9.1394 ± 0.0384[1] mas
Distance357 ± 1 ly
(109.4 ± 0.5 pc)
Absolute magnitude (MV)+1.08[6]
Details
Mass2.37±0.03[7] M☉
Radius2.60+0.07
−0.10[8] R☉
Luminosity45.3+3.1
−3.0[7] L☉
Surface gravity (log g)3.96+0.05
−0.10[8] cgs
Temperature8,974+167
−164[7] K
Metallicity [Fe/H]-0.21[9] dex
Rotational velocity (v sin i)150[7] km/s
Age376±22[7] Myr
Other designations
η Octantis, CPD−83 386, HD 96124, HIP 53702, HR 4312, SAO 258600
Database references
SIMBADdata

Eta Octantis, Latinized from η Octantis, is a solitary star located in the southern circumpolar constellation Octans. With an apparent magnitude of about 6.19, it's barely visible to the naked eye under ideal conditions. The Star is located approximately 357 light-years (109 pc) away from the Solar System, but is drifting closer with a heliocentric radial velocity of -47.69 km/s.

Properties[]

Eta Octantis is an A-type main sequence star with 2.37 times the Sun's mass and 2.6 times the Sun's radius. It radiates at 45.3 solar luminosities from its photosphere at an effective temperature of 8,974 K. Eta Octantis is a rapidly rotating star, with a projected rotational velocity of 150 km/s, and is estimated to be 376 million years old, having completed about 70% of its life time.

References[]

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ Houk, N.; Cowley, A. P. (1975). "University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_f0". University of Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume I. Declinations -90_ to -53_f0., by Houk, N.; Cowley, A. P.. Ann Arbor, MI (USA): Department of Astronomy, University of Michigan, 19 + 452 P. Bibcode:1975mcts.book.....H.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ Buder, S.; et al. (1 April 2019). "The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS". Astronomy and Astrophysics. 624: A19. arXiv:1804.05869. Bibcode:2019A&A...624A..19B. doi:10.1051/0004-6361/201833218. ISSN 0004-6361. S2CID 102485610.
  6. ^ Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
  7. ^ a b c d e Zorec, J.; Royer, F. (1 January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
  8. ^ a b Stassun, Keivan G.; et al. (2019-10-01). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
  9. ^ Anders, F.; et al. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
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