Mu1 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] |
| Distance | 334.9 ± 0.8 ly (102.7 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.97[6] |
| Details | |
| Mass | 1.36+0.26 −0.19[7] M☉ |
| Radius | 4.68+0.15 −0.32[7] R☉ |
| Luminosity | 34.3[8] L☉ |
| Surface gravity (log g) | 3.23+0.11 −0.07[7] cgs |
| Temperature | 6,521[8] K |
| Metallicity [Fe/H] | +0.19[9] dex |
| Age | 900[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
[edit]- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
