| 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 | F7 IV + F6: V: [4] |
| B−V color index | 0.464±0.003 [2] |
| Astrometry | |
| Radial velocity (Rv) | −21.50 [5] km/s |
| Proper motion (μ) |
RA: 95.47
[1]
mas/
yr Dec.: 1.78 [1] mas/ yr |
| Parallax (π) | 16.47 ± 0.59 mas [1] |
| Distance | 198 ± 7
ly (61 ± 2 pc) |
| Absolute magnitude (MV) | 2.15 [6] |
| Orbit [7] | |
| Period (P) | 200.7±1.1 yr |
| Semi-major axis (a) | 0.816±0.006″ |
| Eccentricity (e) | 0.535+0.006 −0.005 |
| Inclination (i) | 64.06+0.26 −0.27° |
| Longitude of the node (Ω) | 174.31+0.38 −0.39° |
| Periastron epoch (T) |
B 1,896.8+0.39 −0.40 |
|
Argument of periastron (ω) (secondary) | 45.9±1.2° |
| Details [6] | |
| 4 Aqr A | |
| Mass | 1.618±0.004 [7] M☉ |
| Luminosity | 11.0 L☉ |
| Surface gravity (log g) | 3.79 cgs |
| Temperature | 6,440 K |
| Metallicity [Fe/H] | 0.18 [8] dex |
| Rotational velocity (v sin i) | 34.6 km/s |
| Age | 1.60 [8] Gyr |
| 4 Aqr B | |
| Mass | 1.331±0.003 [7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | 4 Aqr |
| 4 Aqr A | |
| 4 Aqr B | |
4 Aquarii (abbreviated 4 Aqr) is a binary star system in the constellation Aquarius, [9] located approximately 198 light years away from the Sun. [1] 4 Aquarii is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with a combined apparent visual magnitude of 5.99. [2] The system is moving closer to the Earth with a heliocentric radial velocity of −21.5 km/s. [5]
This is a visual binary with an orbital period of 200.7 years and an eccentricity of 0.535. [7] The magnitude 6.40 [3] primary, designated component A, is an F-type subgiant star with a stellar classification of F7 IV, [4] suggesting that it has exhausted the hydrogen at its core and evolved off the main sequence. [7] It has a dynamically-measured mass 1.6 [7] times that of the Sun and is radiating 11 times the Sun's luminosity from its photosphere at an effective temperature of 6,440 K. [6] The magnitude 7.43 [3] secondary, component B, is a suspected F-type main-sequence star of class F6 V. [4] The pair are an estimated 1.6 billion years old. [8]
References
- ^ a b c d e f 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. S2CID 18759600.
- ^ a b c 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. S2CID 119257644.
- ^ a b c Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920
- ^ a b c Corbally, C. J.; Garrison, R. F. (August 1980). "New spectral classifications on the MK system for visual double stars". Publications of the Astronomical Society of the Pacific. 92: 493–496. Bibcode: 1980PASP...92..493C. doi: 10.1086/130700. S2CID 121017167.
- ^ a b 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. S2CID 119231169.
- ^ a b c Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv: 1611.02897. Bibcode: 2017AJ....153...21L. doi: 10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ a b c d e f Mendez, Rene A.; et al. (November 2017). "Orbits for 18 Visual Binaries and Two Double-line Spectroscopic Binaries Observed with HRCAM on the CTIO SOAR 4 m Telescope, Using a New Bayesian Orbit Code Based on Markov Chain Monte Carlo". The Astronomical Journal. 154 (5): 22. arXiv: 1709.06582. Bibcode: 2017AJ....154..187M. doi: 10.3847/1538-3881/aa8d6f. S2CID 55695873. 187.
- ^ a b c Casagrande, L.; et al. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv: 1103.4651. Bibcode: 2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276. S2CID 56118016.
- ^ a b "* 4 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 October 2014.
