4 Aquarii

4 Aquarii

Observation data Epoch J2000      Equinox J2000
Constellation	Aquarius
Right ascension	20^h 51^m 25.74827^s[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
BD-06° 5604, HD 198571, SAO 144877, WDS J2051.4-0538, HIP 102945, HR 7982.
Database references
SIMBAD	data
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

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. 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. "4 Aquarii". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 23 October 2014.
3. 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.

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.