Alpha 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 |
| Distance | 148 ± 4 ly (45 ± 1 pc) |
| Absolute magnitude (MV) | 1.87[5] |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 V* alf Oct -- Spectroscopic binary, database entry, SIMBAD. Accessed on line September 4, 2008.
- ↑ 2.0 2.1 The double-lined binary alpha Octantis, William Buscombe and Pamela M. Morris, The Observatory 80 (February 1960), pp. 28–29, Bibcode: 1960Obs....80...28B.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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.
- ↑ From apparent magnitude and parallax.
External links
- Alpha Octantis, Jim Kaler, Stars.
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