Eta Circini
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Circinus |
Right ascension | 15h 04m 48.18600s[1] |
Declination | −64° 01′ 52.8611″[1] |
Apparent magnitude (V) | 5.17[2] |
Characteristics | |
Spectral type | G8 III[3] |
B−V color index | +0.93[2] |
Astrometry | |
Radial velocity (Rv) | ±0.8 44.8[4] km/s |
Proper motion (μ) | RA: +102.65[1] mas/yr Dec.: +9.35[1] mas/yr |
Parallax (π) | 11.82 ± 0.30[1] mas |
Distance | 276 ± 7 ly (85 ± 2 pc) |
Details | |
Luminosity | 64[5] L☉ |
Surface gravity (log g) | ±0.05 2.69[6] cgs |
Temperature | ±22 4,954[6] K |
Metallicity [Fe/H] | ±0.02 −0.37[6] dex |
Other designations | |
Database references | |
SIMBAD | data |
Eta Circini (η Cir), is the Bayer designation for a solitary[8] star located in the southern constellation of Circinus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.17.[2] The distance to this star, as determined from an annual parallax shift of 11.82 mas,[1] is around 276 light years.
This is an evolved G-type giant star with a stellar classification of G8 III.[3] It is radiating an estimated 64[5] times the solar luminosity from its outer atmosphere at an effective temperature of 4,954 K.[6]
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
- 1 2 3 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
- 1 2 Houk, Nancy; Cowley, A. P. (1979), University of Michigan Catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
- 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
- 1 2 3 4 Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, Bibcode:2015MNRAS.448.2749A, arXiv:1503.02556 , doi:10.1093/mnras/stv189.
- ↑ "eta Cir -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-01-18.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
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