Epsilon Octantis

ε Octantis


Location of ε Octantis (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 22h 20m 01.67970s[1]
Declination −80° 26′ 23.0947″[1]
Apparent magnitude (V) 5.09[2]
Characteristics
Spectral type M5III[3]
U−B color index +1.18[4]
B−V color index +1.47[4]
Variable type SRb[5]
Astrometry
Radial velocity (Rv)+11.70[6] km/s
Proper motion (μ) RA: +56.81[1] mas/yr
Dec.: -43.47[1] mas/yr
Parallax (π)11.22 ± 0.23[1] mas
Distance291 ± 6 ly
(89 ± 2 pc)
Absolute magnitude (MV)0.34[2]
Details
Mass1.34[7] M☉
Radius16[7] R☉
Luminosity120[2] L☉
Surface gravity (log g)2.15[7] cgs
Temperature4,365[7] K
Other designations
CD-81 831, FK5 839, GC 31166, HIP 110256, HR 8481, HD 210967, SAO 258928, BO Oct
Database references
SIMBADdata

Epsilon Octantis (ε Oct) is a class M5III[3] (red giant) star in the constellation Octans. Its apparent magnitude is 5.09[2] and it is approximately 291 light years away based on parallax.[1]

It is a semiregular variable with a magnitude range of 4.58 to 5.3 and a (poorly defined) period around 55 days.[5]

References

  1. 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971 Freely accessible. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. 1 2 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. 1 2 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  5. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S.
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. 1 2 3 4 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 Freely accessible. Vizier catalog entry
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