24 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 39m 31.52640s[1] |
| Declination | −00° 03′ 04.0268″[1] |
| Apparent magnitude (V) | 6.65[2] |
| Characteristics | |
| Spectral type | F7 III[3] |
| B−V color index | +0.52[4] |
| Astrometry | |
| Proper motion (μ) | RA: +232.76[1] mas/yr Dec.: +8.81[1] mas/yr |
| Parallax (π) | 22.74 ± 0.81[1] mas |
| Distance | 143 ± 5 ly (44 ± 2 pc) |
| Absolute magnitude (MV) | 3.43[2] |
| Orbit[5] | |
| Period (P) | 48.65 yr |
| Semi-major axis (a) | 0.448" |
| Eccentricity (e) | 0.868 |
| Inclination (i) | 58.0° |
| Longitude of the node (Ω) | 139.3° |
| Periastron epoch (T) | 1971.55 |
| Argument of periastron (ω) (secondary) | 293.0° |
| Details | |
| Temperature | 6,223[2] K |
| Metallicity [Fe/H] | –0.11[2] dex |
| Age | 3.1[2] Gyr |
| Other designations | |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
24 Aquarii (abbreviated 24 Aqr) is a double star in the equatorial constellation of Aquarius. 24 Aquarii is the Flamsteed designation. The apparent magnitude of this system is 6.65,[2] which, according to the Bortle Dark-Sky Scale, means it is a faint star that is just visible to the naked eye from dark, rural skies. It has an annual parallax shift of 22.74 milliarcseconds,[1] which is equivalent to a distance of 143 light-years (44 parsecs) from Earth. The system has a stellar classification of F7 III,[3] suggesting it contains an evolved giant star.
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 5 6 Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959.
- 1 2 Fehrenbach, C. (1966), "La mesure des vitesses radiales au prisme objectif XIX. Liste de 893 vitesses radiales determinees au prisme objectif a vision directe", Publications de l'Observatoire de Haute-Provence 8: 25, Bibcode:1966POHP....8...25F.
- ↑ Cousins, A. W. J.; Stoy, R. H. (1962), "Photoelectric magnitudes and colours of Southern stars.", Royal Observatory Bulletin 64, Bibcode:1962RGOB...64..103C.
- ↑ Branham, Richard L., Jr. (March 2005), "Calculating the Apparent Orbit of a Double Star", The Astrophysical Journal 622 (1): 613–61, Bibcode:2005ApJ...622..613B, doi:10.1086/427870.
External links
- Image 24 Aquarii
- Orbital elements of seven new spectroscopic binaries
- Calculating the Orbit of a Double Star with Visual, Speckle, and Radial Velocity Data
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