| absmag_v =
}}{{Starbox orbit
| reference = [13]
| primary = {{nowrap|5 Aql Aa}}
| name = {{nowrap|5 Aql Ab}}
| period = {{nowrap|33.65 ± 0.78}}
| axis = {{nowrap|0.219 ± 0.016}}
| eccentricity = {{nowrap|0.333 ± 0.054}}
| inclination = {{nowrap|97.9 ± 1.4}}
| node = {{nowrap|174.3 ± 1.9}}
| periastron = {{nowrap|1989.71 ± 0.76}}
| periarg = {{nowrap|251.7 ± 5.9}}
}}{{Starbox detail
| mass =
| radius =
| luminosity =
| temperature =
| metal_fe =
| rotational_velocity = 71[14]
| age_gyr =
}}{{Starbox catalog
| names = BD–01 3559, HD 173654, HR 7059, WDS 18465-0058.[15][16]
| component1 = 5 Aql A
| names1 = HIP 92117, SAO 142606.[15]
| component2 = 5 Aql B
| names2 = HIP 92118, SAO 142607.[16]
}}{{Starbox reference
| Simbad = 5+Aql | sn = 5 Aql
| Simbad2 = 5+Aql+A | sn2 = 5 Aql A
| Simbad3 = 5+Aql+B | sn3 = 5 Aql B
}}{{Starbox end}}5 Aquilae (abbreviated 5 Aql) is a quadruple star[4] system in the constellation of Aquila. 5 Aquilae is the Flamsteed designation. The combined apparent visual magnitude of the system is 5.9,[3] which means it is faintly visible to the naked eye. With an annual parallax shift of 8.94 mas,[ the distance to this system is estimated as approximately {{Convert|360|ly|pc|abbr=off|lk=on}}, albeit with a 13% margin of error.]
Two of the components of this system, 5 Aquilae Aa and Ab, are Am stars. That is, they are chemically peculiar stars that show unusual abundances of elements other than hydrogen and helium. The two orbit each other with a period lasting 33.65 years at an eccentricity of 0.33. One of these stars is itself a close spectroscopic binary, with a 4.765 day period and a nearly circular orbit that has an eccentricity of just 0.02.[13] The fourth component, 5 Aquilae B, is a magnitude 7.65 F-type main sequence star with a stellar classification of F3 Vm. It is at an angular separation of 12.71 arcseconds from the other members of the system.[4]
References
1. ^1 {{citation | display-authors=1 | last1=Cowley | first1=A. | last2=Cowley | first2=C. | last3=Jaschek | first3=M. | last4=Jaschek | first4=C. | title=A study of the bright A stars. I. A catalogue of spectral classifications | journal=Astronomical Journal | volume=74 | pages=375–406 | doi=10.1086/110819 | bibcode=1969AJ.....74..375C | postscript=. |date=April 1969}}
2. ^1 {{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor=Batten, Alan Henry | editor2=Heard, John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E | postscript=. }}
3. ^1 {{citation | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 | doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255 | postscript=. |date=October 2002}}
4. ^1 2 3 {{citation | last1=Nicolet | first1=B. | date=1978 | title=Photoelectric photometric Catalogue of homogeneous measurements in the UBV System | journal=Astronomy and Astrophysics Supplement Series | volume=34 | pages=1–49 | bibcode=1978A&AS...34....1N | postscript=. }}
5. ^1 2 {{citation | last1=Mason | first1=Brian D. | last2=Hartkopf | first2=William I. | last3=Tokovinin | first3=Andrei | title=Binary Star Orbits. IV. Orbits of 18 Southern Interferometric Pairs | journal=The Astronomical Journal | volume=140 | issue=3 | pages=735–743 | doi=10.1088/0004-6256/140/3/735 | bibcode=2010AJ....140..735M | postscript=. |date=September 2010}} Preliminary orbit.
6. ^1 2 3 4 {{citation | 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 | postscript=. |arxiv = 0806.2878 |date=September 2008}}
7. ^1 2 {{cite simbad | title=* 5 Aql A | accessdate=2012-07-22 | postscript=. }}
8. ^1 2 {{cite simbad | title=* 5 Aql B | accessdate=2012-07-22 | postscript=. }}