Astronomy:Rho Octantis

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Short description: High proper motion star in the constellation Octans
ρ Octantis
Octans constellation map.svg
Red circle.svg
Location of ρ Octantis (circled)
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
Distance215 ± 1 ly
(66.0 ± 0.3 pc)
Absolute magnitude (MV)+1.47[6]
Details
Mass1.99[7] M
Radius2.19±0.07[8] R
Luminosity21±1[8] L
Surface gravity (log g)4.06±0.14[9] cgs
Temperature8,881±302[9] K
Rotational velocity (v sin i)128[10] km/s
Age431[7] Myr
Other designations
Database references
SIMBADdata

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. 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. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 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. Bibcode2000A&A...355L..27H. 
  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_ƒ0.. Bibcode1975mcts.book.....H. 
  4. 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. Bibcode1966CoLPL...4...99J. 
  5. 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. Bibcode2007AN....328..889K. 
  6. 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. Bibcode2012AstL...38..331A. 
  7. 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. Bibcode2012MNRAS.427..127B. 
  8. 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. Bibcode2019AJ....158..138S. 
  9. 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. Bibcode2015ApJ...804..146D. 
  10. 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. Bibcode2005ESASP.560..571G. 
  11. 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. Bibcode2001AJ....122.3466M.