53 Aquarii
{{short description|Binary star in the constellation Aquarius}}
{{Starbox begin
| name = 53 Aquarii
}}
{{Starbox image
| image =
| caption = Location of 53 Aquarii (circled)
}}
{{Starbox observe
| epoch = J2000
| appmag_v = 5.56 (6.35/6.57)
| constell = Aquarius
}}
{{Starbox character
| class = {{nowrap|G1 V + G5 V Fe–0.8 CH–1}}
| variable =
}}
{{Starbox astrometry
| parallax = 49.50
| p_error = 1.23
| absmag_v = 4.05 (4.94/4.87)
}}
{{Starbox orbit
| primary = 53 Aqr A
| name = 53 Aqr B
| period = 3500
| axis = 14.88
| eccentricity = 0.90
| inclination = 44.13
| node = 294.55
| periastron = B 2023
| periarg = 151.40
}}
{{Starbox detail
| component1 = 53 Aqr A
| component2 = 53 Aqr B
}}
{{Starbox catalog
| component1 = 53 Aqr A
| names1 = BD−17 6521, HD 212698, HR 8545, LTT 9026, SAO 165078.
| component2 = 53 Aqr B
| names2 = BD−17 6520, HD 212697, HR 8544, LTT 9025, SAO 165077.
}}
{{Starbox reference
| Simbad = 53+Aqr | sn=53 Aqr
| Simbad2 = 53+Aqr+A | sn2=53 Aqr A
| Simbad3 = 53+Aqr+B | sn3=53 Aqr B
}}
{{Starbox end}}
53 Aquarii (abbreviated 53 Aqr) is a binary star system in the equatorial constellation of Aquarius. 53 Aquarii is its Flamsteed designation though the star also bears the Bayer designation of f Aquarii. The combined apparent visual magnitude of the pair is a 5.56, making it just visible to the naked eye in dark suburban skies. Based upon an annual parallax shift of 49.50 milliarcseconds for the first component, this system is located at a distance of approximately {{Convert|65|ly|pc|abbr=off|lk=on}} from Earth.
This is a wide binary star system with a projected separation of 100 astronomical units; indicating that the two stars are at least this distance apart. The primary component is a solar-type main sequence star with a stellar classification of G1 V. It has about 99% of the Sun's mass, 111% of the Sun's radius, and shines with 139% of the luminosity of the Sun. This energy is being emitted from an outer envelope at an effective temperature of 5,922 K, giving it the golden hue of a G-type star. An examination of the primary component with the Spitzer Space Telescope failed to detect any infrared excess that might otherwise be an indication of a circumstellar debris disk.
The companion is a slightly cooler star with an effective temperature of 5,811 K. It has a stellar classification of G5 V Fe–0.8 CH–1, indicating it is a chemically peculiar G-type main sequence star showing an under-abundance of iron and the molecule CH in its spectrum. As of 2008, it has an angular separation of 1.325 arcseconds along a position angle of 30.9° from the primary.
This system is coeval with the Castor Moving Group of stars that share a common motion through space; hence it is a candidate member of that association. This suggests that the system is young; its estimated age is in the range of 180 to 370 million years, based upon the spectrum and X-ray luminosity, respectively.
References
{{reflist|refs=
{{cite journal | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E |arxiv = 0806.2878 |date=September 2008| doi-access=free | s2cid=14878976 }}
{{cite simbad | title=53 Aqr | access-date=2012-07-14 }} See also the children entries.
{{citation|title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |access-date=2012-01-16 |postscript=. |url-status=dead |archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=March 18, 2012 }}
}}
{{Stars of Aquarius}}
{{DEFAULTSORT:53 Aquarii}}
Category:Aquarius (constellation)