Alpha Octantis

α Octantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 21h 04m 43.0645s[1]
Declination −77° 01′ 25.562″[1]
Apparent magnitude (V) 5.15[1]
Characteristics
Spectral type F4III / F5III
(spectroscopic binary)[2]
U−B color index +0.13[3]
B−V color index +0.49[3]
Variable type EB[4]
Astrometry
Radial velocity (Rv)45.0 ± 2[1] km/s
Proper motion (μ) RA: 13.83[1] mas/yr
Dec.: −369.37[1] mas/yr
Parallax (π)22.07 ± 0.57[1] mas
Distance148 ± 4 ly
(45 ± 1 pc)
Absolute magnitude (MV)1.87[5]
Other designations
α Oct, Alpha Octantis, Alpha Oct, CD−77 1053, CPD−77 1474, FK5 787, GC 29343, HD 199532, HIP 104043, HR 8021, LTT 8327, NLTT 50332, PPM 374864, SAO 257879.[1]
Database references
SIMBADdata

Alpha Octantis (Alpha Oct, α Octantis, α Oct) is a star in the constellation of Octans. It has an overall apparent visual magnitude of approximately 5.15 and is a spectroscopic binary star which consists of two giant stars, each with spectral type F, orbiting each other with a period of just over 9 days.[1][2] The pair has also been classified as a Beta Lyrae-type eclipsing binary system.[4]

References

  1. 1 2 3 4 5 6 7 8 9 V* alf Oct -- Spectroscopic binary, database entry, SIMBAD. Accessed on line September 4, 2008.
  2. 1 2 The double-lined binary alpha Octantis, William Buscombe and Pamela M. Morris, The Observatory 80 (February 1960), pp. 28–29, Bibcode: 1960Obs....80...28B.
  3. 1 2 HR 8021, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 4, 2008.
  4. 1 2 alf Oct, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 4, 2008.
  5. ↑ From apparent magnitude and parallax.

External links

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