Astronomy:Mu1 Octantis
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Short description: Star in the constellation of Octans
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas |
| 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 solar luminosity 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 8.2 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. doi:10.1093/mnras/stx1433. Bibcode: 2017MNRAS.471..770M.
- ↑ 9.0 9.1 9.2 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. doi:10.1051/0004-6361/200811191. ISSN 0004-6361. Bibcode: 2009A&A...501..941H.
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