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77 Aquarii

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Astrometry</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></tr><tr style="vertical-align:top;"><td>Radial velocity (Rv)</td><td>–36.3[4] km/s</td></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: –219.73[1] mas/yr
Dec.: –87.78[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>24.28 ± 0.56[1]mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>134 ± 3 ly
(Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value). ± Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value).pc)</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></th></tr><tr style="vertical-align:baseline;"><td>Radius</td><td>6[5] R</td></tr><tr style="vertical-align:baseline;"><td>Luminosity</td><td>13.5[5] L</td></tr><tr style="vertical-align:baseline;"><td>Surface gravity (log g)</td><td>2.8[5] cgs</td></tr><tr style="vertical-align:baseline;"><td>Temperature</td><td>4,581[5] K</td></tr><tr style="vertical-align:baseline;"><td>Metallicity [Fe/H]</td><td>+0.03[5] dex</td></tr><tr style="vertical-align:baseline;"><td>Rotational velocity (v sin i)</td><td>3.9[5] km/s</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Other designations</th></tr><tr><td colspan="2">
BD–17 6619, HD 216640, HIP 113148, HR 8711, SAO 165376.[6]
</td></tr>
77 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 54m 45.47121s[1]
Declination –16° 16′ 19.0392″[1]
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Characteristics
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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 Script error: No such module "convert". 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. ^ a b c d e van Leeuwen, F. (November 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. 
  2. ^ a b c d 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. ^ a b 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. ^ a b c d e f g 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