47 Aquarii
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h21m35.56816s[1] |
| Declination | −21° 35′ 53.6431″[1] |
| Apparent magnitude(V) | 5.135[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−Vcolor index | 1.054[2] |
| Astrometry | |
| Radial velocity(Rv) | +48.2[2]km/s |
| Proper motion(μ) | RA:−10.986[1]mas/yr Dec.:−83.914[1]mas/yr |
| Parallax(π) | 18.0015 ± 0.1709mas[1] |
| Distance | 181 ± 2ly (55.6 ± 0.5pc) |
| Absolute magnitude(MV) | +1.52[4] |
| Details[5] | |
| Mass | 1.35M☉ |
| Radius | 7.86R☉ |
| Luminosity | 30L☉ |
| Surface gravity(logg) | 2.69cgs |
| Temperature | 4,750K |
| Metallicity[Fe/H] | −0.18±0.08dex |
| Rotational velocity(vsini) | 1.43 km/s |
| Age | 2.4[2]Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
47 Aquarii,abbreviated47 Aqr,is astarin thezodiacconstellationofAquarius.47 Aquariiis itsFlamsteed designation.It is a faint star but visible to the naked eye in good seeing conditions, having anapparent visual magnitudeof 5.135.[2]Based upon an annualparallax shiftof18.0mas,[1]it is located 181light yearsaway. At that distance, the visual magnitude of the star is diminished by anextinctionof 0.088 due tointerstellar dust.[5]It is moving further from the Earth with a heliocentricradial velocityof +48 km/s.[2]
This is anevolvedgiant starcurrently on thered giant branch[5]with astellar classificationof K0 III.[3]The star has 1.35 times themass of the Sunand has expanded to 7.86 times theSun's radius.It is radiating 30 times theSun's luminosityfrom its enlargedphotosphereat aneffective temperatureof 4,750 K.[5]
References
[edit]- ^abcdefBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.
- ^abcdefLuck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants",Astronomical Journal,150(3), 88,arXiv:1507.01466,Bibcode:2015AJ....150...88L,doi:10.1088/0004-6256/150/3/88,S2CID118505114.
- ^abHouk, Nancy; Smith-Moore, M. (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1988mcts.book.....H.
- ^Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation",Astronomy Letters,38(5): 331,arXiv:1108.4971,Bibcode:2012AstL...38..331A,doi:10.1134/S1063773712050015,S2CID119257644.
- ^abcdJones, M. I.; et al. (December 2011), "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties",Astronomy & Astrophysics,536:7,arXiv:1110.6459,Bibcode:2011A&A...536A..71J,doi:10.1051/0004-6361/201117887,S2CID55769003,A71.
- ^"47 Aqr".SIMBAD.Centre de données astronomiques de Strasbourg.RetrievedOctober 23,2018.
