Astronomy:Rho Octantis
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Short description: High proper motion star in the constellation Octans
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 15h 43m 16.927s[1] |
| Declination | −84° 27′ 54.99″[1] |
| Apparent magnitude (V) | 5.57±0.01[2] |
| Characteristics | |
| Spectral type | A1/2 V[3] |
| U−B color index | +0.08[4] |
| B−V color index | +0.11[4] |
| Astrometry | |
| Radial velocity (Rv) | −11±10[5] km/s |
| Proper motion (μ) | RA: +131.101[1] mas/yr Dec.: +96.007[1] mas/yr |
| Parallax (π) | 15.1565 ± 0.0796[1] mas |
| Distance | 215 ± 1 ly (66.0 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.47[6] |
| Details | |
| Mass | 1.99[7] M☉ |
| Radius | 2.19±0.07[8] R☉ |
| Luminosity | 21±1[8] L☉ |
| Surface gravity (log g) | 4.06±0.14[9] cgs |
| Temperature | 8,881±302[9] K |
| Rotational velocity (v sin i) | 128[10] km/s |
| Age | 431[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho Octantis, Latinized from ρ Octantis, is a star located in the southern circumpolar constellation Octans. With an apparent magnitude of 5.57,[2] its faintly visible to the naked eye under ideal conditions. The star is located 215 light years away from the Solar System,[1] but is drifting closer with a radial velocity of −11 km/s.[5]
Rho Octantis has a classification of A1/2 V, which states its a star with the traits of an A1 and A2 main-sequence star. It has nearly twice the mass of the Sun,[7] and has a radius of 2.19 solar radii.[8] The star radiates at a luminosity 21 times greater than the Sun from its photosphere[8] at an effective temperature of 8,881 K,[9] which gives it a white hue. Like many A-type stars, Rho Octantis rotates rapidly, with a projected rotational velocity of 128 km/s;[10] it is 431 million years old.[7] Rho Octantis has a common proper motion K0 companion 65.7” away.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 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.
- ↑ 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. (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 Kharchenko, N. V.; Scholz, R. -D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K.
- ↑ Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". 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 Bressan, Alessandro; Marigo, Paola; Girardi, Léo.; Salasnich, Bernardo; Dal Cero, Claudia; Rubele, Stefano; Nanni, Ambra (November 2012). "PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code". Monthly Notices of the Royal Astronomical Society 427 (1): 127–145. doi:10.1111/j.1365-2966.2012.21948.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..127B.
- ↑ 8.0 8.1 8.2 8.3 Stassun, Keivan G. et al. (2019-10-01). "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.
- ↑ 9.0 9.1 9.2 David, Trevor J.; Hillenbrand, Lynne A. (May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. ISSN 0004-637X. Bibcode: 2015ApJ...804..146D.
- ↑ 10.0 10.1 Głȩbocki, R.; Gnaciński, P. (March 2005). "Systematic errors in the determination of stellar rotational velocities". 13th Cambridge Workshop on Cool Stars 560: 571. Bibcode: 2005ESASP.560..571G.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001-12-01). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
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