66 Aquarii

66 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings


Location of 66 Aquarii (circled)

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
Distance430 ± 10 ly
(133 ± 5 pc)
Details
Radius37[6] R☉
Surface gravity (log g)2.06[7] cgs
Temperature4,170[7] K
Metallicity [Fe/H]–0.23[7] dex
Rotational velocity (v sin i)10[8] km/s
Other designations
g1 Aquarii, BD–19 6324, HD 215167, HIP 112211, HR 8649, SAO 165252.[9]

66 Aquarii (g1 Aquarii[10]) is the Flamsteed designation for a star in the equatorial constellation of Aquarius. 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
  2. ↑ 2.0 2.1 2.2 2.3 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.
  3. ↑ 3.0 3.1 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.
  4. ↑ 4.0 4.1 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
  5. ↑ Wilson, Ralph Elmer (1953), General catalogue of stellar radial velocities, Carnegie Institution of Washington, Bibcode:1953QB901.W495......
  6. ↑ 6.0 6.1 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.
  7. ↑ 7.0 7.1 7.2 7.3 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.
  8. ↑ 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.
  9. ↑ "g Aqr -- Variable Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-14
  10. ↑ 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.
  11. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16

External links