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{{redirect-distinguish|l Aquilae|Lambda Aquilae|L'Aquila}}{{Starbox begin
| name = 71 Aquilae
}}{{Starbox observe
| epoch = J2000
| ra = {{RA|20|38|20.28206}}
| dec = {{DEC|-01|06|18.4311}}
| appmag_v = 4.33[3]
| constell = Aquila
}}{{Starbox character
| class = G8 III[4]
| b-v = +0.96[3]
| u-b = +0.68[3]
| r-i = 0.46
| v-r =
| variable =
}}{{Starbox astrometry
| radial_v = -5.6[7]
| prop_mo_ra = +14.84
| prop_mo_dec = -16.45
| parallax = 9.67
| p_error = 0.75
| parallax_footnote =
| absmag_v = –1.03[11]
}}{{Starbox orbit
| reference = [12]
| period_unitless = 205.2 days
| axis_unitless = {{nowrap|3.82 ± 0.81 mas}}
| eccentricity = 0.000
| inclination = {{nowrap|147.70° ± 5.90}}
| node = {{nowrap|314.00 ± 1.30}}
| periastron = 2423358.0 HJD
| periarg = 0.00
}}{{Starbox detail
| mass =
| radius =
| luminosity =
| temperature = 5,060[13]
| metal_fe = –0.13[13]
| gravity = 2.87[13]
| rotational_velocity = 10[16]
| age_gyr =
}}{{Starbox catalog
| names = BD-01 4016, HD 196574, HIP 101847, HR 7884, SAO 144649.[17]
}}{{Starbox reference
|Simbad=71+Aql
}}{{Starbox end}}71 Aquilae (abbreviated 71 Aql) is a binary star in the equatorial constellation of Aquila. 71 Aquilae is its Flamsteed designation though it also bears the Bayer designation l Aquilae. The apparent visual magnitude of the system is 4.33,[3] making it bright enough to be viewed by the naked eye. It has an annual parallax shift of 9.67 mas,[ which equates to a physical distance of {{Convert|340|ly|pc|abbr=off|lk=on}} from Earth, give or take a 30 light-year margin of error. At this distance, the brightness of the system is diminished by 0.065 in visual magnitude from extinction caused by interstellar gas and dust.[11]]This is a spectroscopic binary system where the presence of an orbiting companion is revealed by shifts in the spectral lines caused by the Doppler effect. The primary component is a giant star with a stellar classification of G8 III.[4] The secondary is following a circular orbit with a period of 205.2 days.[12] References1. ^1 2 3 {{citation | last=McWilliam | first=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. }}
2. ^1 {{citation | last=Wilson | first=R. E. | year=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institute of Washington, D.C. | bibcode=1953GCRV..C......0W | postscript=. }}
3. ^1 {{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | bibcode=1970CoAsi.239....1B | postscript=. }}
4. ^1 2 3 4 {{citation | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}
5. ^1 2 {{citation | display-authors=1 | last1=Jancart | first1=S. | last2=Jorissen | first2=A. | last3=Babusiaux | first3=C. | last4=Pourbaix | first4=D. | title=Astrometric orbits of SB^9 stars | journal=Astronomy and Astrophysics | volume=442 | issue=1 | pages=365–380 |date=October 2005 | doi=10.1051/0004-6361:20053003 | bibcode=2005A&A...442..365J | arxiv=astro-ph/0507695 | postscript=. }}
6. ^1 2 {{citation | last1=Ryon | first1=Jenna | last2=Shetrone | first2=Matthew D. | last3=Smith | first3=Graeme H. | title=Comparing the Ca ii H and K Emission Lines in Red Giant Stars | journal=Publications of the Astronomical Society of the Pacific | volume=121 | issue=882 | pages=842–856 |date=August 2009 | doi=10.1086/605456 | bibcode=2009PASP..121..842R | postscript=. |arxiv = 0907.3346 }}
7. ^1 2 {{citation | last1=Herbig | first1=George H. | last2=Spalding | first2=John F., Jr. | title=Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5 | journal=Astrophysical Journal | volume=121 | page=118 |date=January 1955 | doi=10.1086/145969 | bibcode=1955ApJ...121..118H | postscript=. }}
8. ^1 {{cite simbad | title=* l Aql | accessdate=2012-07-23 | postscript=. }}
[1][2][3][4][5][6][7][8]
}}{{Stars of Aquila}} 9 : Aquila (constellation)|Spectroscopic binaries|G-type giants|Bayer objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects|Durchmusterung objects |