Mu1 Octantis

For other stars with this Bayer designation, see μ Octantis.
μ1 Octantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 20h 42m 02.9873s[1]
Declination −76° 10′ 50.131″[1]
Apparent magnitude (V) 5.98 ± 0.01[2]
Characteristics
Spectral type F6 II/III[3]
U−B color index +0.11[4]
B−V color index +0.44[4]
Astrometry
Radial velocity (Rv)−36 ± 4[5] km/s
Proper motion (μ) RA: +190.891[1] mas/yr
Dec.: −9.479[1] mas/yr
Parallax (π)9.7399 ± 0.0241 mas[1]
Distance334.9 ± 0.8 ly
(102.7 ± 0.3 pc)
Absolute magnitude (MV)+0.97[6]
Details
Mass1.36+0.26
−0.19[7] M☉
Radius4.68+0.15
−0.32[7] R☉
Luminosity34.3[8] L☉
Surface gravity (log g)3.23+0.11
−0.07[7] cgs
Temperature6,521[8] K
Metallicity [Fe/H]+0.19[9] dex
Age900[9] Myr
Other designations
μ1 Oct, 50 G. Octantis, CD−76°1054, CPD−76°1434, GC 28731, HD 196051, HIP 102162, HR 7863, SAO 257838, LTT 8161
Database references
SIMBADdata

Mu1 Octantis, Latinized from μ1 Octantis, is a solitary star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98,[2] allowing it to be faintly visible to the naked eye under ideal conditions. Located 335 light years away,[1] it is approaching the Sun with a heliocentric radial velocity of −36 km/s.[5]

This object is an F-type star with the blended luminosity class of a giant star and a bright giant.[3] At present it has 1.36 times the mass of the Sun[7] but has expanded to 4.68 times its girth.[7] It radiates at 34.3 L☉ from its enlarged photosphere at an effective temperature of 6,521 K,[8] giving it a yellow white glow. Mu1 Octantis is metal enriched and has an age of 900 million years.[9]

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (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. ^ a b 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_ƒ0. Bibcode:1975mcts.book.....H.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  6. ^ Anderson, E.; Francis, Ch. (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 255204555.
  7. ^ a b c d e Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
  8. ^ a b c McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
  9. ^ a b c Holmberg, J.; Nordström, B.; Andersen, J. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood: III. Improved distances, ages, and kinematics". Astronomy & Astrophysics. 501 (3): 941–947. arXiv:0811.3982. Bibcode:2009A&A...501..941H. doi:10.1051/0004-6361/200811191. ISSN 0004-6361.