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] (6.40 / 7.43)[3] |
| Characteristics | |
| Spectral type | F5IV-V[2] |
| B−V color index | 0.46[2] |
| Astrometry | |
| Radial velocity (Rv) | -21.50[4] 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 |
| Orbit[3] | |
| Period (P) | 199.8 ± 3.0 yr |
| Semi-major axis (a) | 0.844 ± 0.015″ |
| Eccentricity (e) | 0.526 ± 0.014 |
| Inclination (i) | 65.13 ± 0.70° |
| Longitude of the node (Ω) | 173.36 ± 0.86° |
| Periastron epoch (T) | B 1896.99 ± 0.81 |
| Argument of periastron (ω) (secondary) | 47.9 ± 2.4° |
| Details | |
| Mass | 1.61 / 1.33[5] M☉ |
| Rotation | 213.39 km/s[2] |
| Other designations | |
| Database references | |
| SIMBAD | 4 Aqr |
| 4 Aqr A | |
| 4 Aqr B | |
4 Aquarii (abbreviated 4 Aqr) is a binary star in the constellation Aquarius. 4 Aquarii is the Flamsteed designation. 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
- Footnotes
- 1 2 3 4 5 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.
- 1 2 3 4 5 "* 4 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 October 2014.
- 1 2 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 28 May 2017.
- ↑ 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- ↑ Tokovinin, Andrei (2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 87. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87.
- Sources
Bartkevičius, A.; Gudas, A. (2002). "Kinematics of Hipparcos Visual Binaries. II. Stars with Ground-Based Orbital Solutions". Baltic Astronomy. 11: 153–203. Bibcode:2002BaltA..11..153B.
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