66 Aquarii
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 43m 35.23307s[1] |
| Declination | –18° 49′ 49.3557″[1] |
| Apparent magnitude (V) | 4.673[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| U−B color index | +1.549[2] |
| B−V color index | +1.376[2] |
| Variable type | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | +21.6[5] km/s |
| Proper motion (μ) | RA: –31.73[1] mas/yr Dec.: –28.54[1] mas/yr |
| Parallax (π) | 7.53 ± 0.26[1] mas |
| Distance | 430 ± 10 ly (133 ± 5 pc) |
| Details | |
| Radius | 37[6] R☉ |
| Surface gravity (log g) | 2.06[7] cgs |
| Temperature | 4,170[7] K |
| Metallicity [Fe/H] | –0.23[7] dex |
| Rotational velocity (v sin i) | 10[8] km/s |
| Other designations | |
66 Aquarii (abbreviated 61 Aqr) is a star in the equatorial constellation of Aquarius. 66 Aquarii is the Flamsteed designation though the star also bears the Bayer designation of g1 Aquarii.[10] It is visible to the naked eye with an apparent visual magnitude of 4.673.[2] Based upon an annual parallax shift of 7.53 milliarcseconds,[1] the distance to this star is about 430 light-years (130 parsecs).
This is an evolved giant star with a stellar classification of K3 III.[3] It has expanded to 37 times the radius of the Sun[6] and is radiating energy from its outer envelope at an effective temperature of 4,170 K.[7] This gives it the orange-hued glow of a K-type star.[11] It is a suspected variable star that ranges in magnitude between 4.66 and 4.71.[4]
References
- 1 2 3 4 5 6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. - 1 2 3 4 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society, 172: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
- 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- 1 2 Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V. (December 1998), New Catalogue of Suspected Variable Stars. Supplement, 1.0, 4655, Information Bulletin on Variable Stars, p. 1, Bibcode:1998IBVS.4655....1K
- ↑ Wilson, Ralph Elmer (1953), General catalogue of stellar radial velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- 1 2 3 4 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
- ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
- ↑ "g Aqr -- Variable Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-14
- ↑ HD 215167, database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16