77 Aquarii

77 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 54m 45.47121s[1]
Declination –16° 16′ 19.0392″[1]
Apparent magnitude (V) 5.55[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.089[2]
B−V color index +1.104[2]
Astrometry
Radial velocity (Rv)–36.3[4] km/s
Proper motion (μ) RA: –219.73[1] mas/yr
Dec.: –87.78[1] mas/yr
Parallax (π)24.28 ± 0.56[1] mas
Distance134 ± 3 ly
(41.2 ± 0.9 pc)
Details
Radius6[5] R☉
Luminosity13.5[5] L☉
Surface gravity (log g)2.8[5] cgs
Temperature4,581[5] K
Metallicity [Fe/H]+0.03[5] dex
Rotational velocity (v sin i)3.9[5] km/s
Other designations
BD–17 6619, HD 216640, HIP 113148, HR 8711, SAO 165376.[6]

77 Aquarii is the Flamsteed designation for a star in the equatorial constellation of Aquarius. It has an apparent visual magnitude of 5.55[2] and is around 134 light-years (41 parsecs) from Earth. This is a giant star with a stellar classification of K1 III.[3] It has six times the radius of the Sun and shines with 13.5 times the Sun's luminosity. The outer atmosphere has an effective temperature of 4,581 K,[5] giving it the orange-hued glow of a K-type star.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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; Smith-Moore, M. (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. ↑ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Massarotti, Alessandro et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  6. ↑ "77 Aqr -- Variable Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-15.
  7. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16

External links