4 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 51m 25.74827s[1] |
| Declination | −05° 37′ 35.8719″[1] |
| Apparent magnitude (V) | 5.99[2] |
| Characteristics | |
| Spectral type | F5IV-V[2] |
| B−V color index | 0.46[2] |
| Astrometry | |
| Radial velocity (Rv) | -21.50[3] km/s |
| Proper motion (μ) | RA: 95.47[1] mas/yr Dec.: 1.78[1] mas/yr |
| Parallax (π) | 16.47 ± 0.59[1] mas |
| Distance | 198 ± 7 ly (61 ± 2 pc) |
| Absolute magnitude (MV) | 2.07 |
| Details | |
| Rotation | 213.39 km/s[2] |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
4 Aquarii is a binary star in the constellation Aquarius. Located approximately 60.72 parsecs (198.0 ly) distant, the combined apparent magnitude of the system is 5.99[2] The spectral type of the primary star is F5IV-V, meaning that it is either a subgiant or a main-sequence star of spectral type F.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (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.
- ↑ 2.0 2.1 2.2 2.3 2.4 "4 Aquarii". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 23 October 2014.
- ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
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