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{{Starbox begin
| name = 16 Aquarii
}}{{Starbox observe
| epoch = J2000
| constell = Aquarius
| ra = {{RA|21|21|04.31919}}[1]
| dec = {{DEC|−04|33|36.4532}}[1]
| appmag_v = 5.869[3]
}}{{Starbox character
| class = G7 III[4]
| b-v = {{Val|0.912|0.001}}[5]
| u-b =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|−6.0|2.9}}[6]
| prop_mo_ra = −9.86[7]
| prop_mo_dec = +11.22[7]
| parallax = 9.5319
| p_error = 0.1192
| parallax_footnote = [1]
| absmag_v = 1.08[5]
}}{{Starbox detail
| source = [11]
| mass = {{Val|2.34|0.13}}
| radius = {{Val|7.86|0.26}}
| luminosity = {{Val|37.4|2.3}}
| temperature = {{Val|5096|35|fmt=commas}}
| metal_fe = {{Val|0.01|0.10}}
| gravity = {{Val|3.03|0.04}}
| rotational_velocity = 1.79[12]
| age_myr = {{Val|740|130}}
}}{{Starbox catalog
| names = {{odlist | f=15 Aqr | BD=−05° 5524 | HD=203222 | HIP=105412 | HR=8160 | SAO=145317 }}
}}{{Starbox reference
| Simbad = 16+Aqr
}}{{Starbox end}}16 Aquarii, abbreviated 16 Aqr, is a star in the constellation of Aquarius. 16 Aquarii is the Flamsteed designation. It is a faint star, just visible to the naked eye, with an apparent visual magnitude of 5.869.[3] Based upon an annual parallax shift of {{Val|9.5|ul=mas}},[1] it is located about 342 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −6 km/s,[6] and is predicted to come within {{Convert|66.91|pc|ly|abbr=off|sigfig=2|disp=out}} in 6.8 million years.[5]At the estimated age of 740 million years, this is an aging giant star currently on the red giant branch[11] with a stellar classification of G7 III.[4] This indicates it has exhausted the supply of hydrogen at its core and is generating energy via hydrogen fusion along a shell surrounding a hot core of inert helium. The star has 2.3 times the mass of the Sun and has expanded to 8 times the Sun's radius. It is radiating 37 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,096 K.[11] References1. ^1 2 3 4 {{cite DR2}}
2. ^1 2 3 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
3. ^1 2 {{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. }}
4. ^1 2 {{citation | last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François | last3=Brouillet | first3=Nathalie | last4=Chemin | first4=Laurent | title=The PASTEL catalogue: 2016 version | journal=Astronomy & Astrophysics | volume=591 | pages=A118 | year=2016 | bibcode=2016A&A...591A.118S | arxiv=1605.07384 | doi=10.1051/0004-6361/201628497 | postscript=. }}
5. ^1 2 3 {{citation | display-authors=1 | last1=Reffert | first1=Sabine | last2=Bergmann | first2=Christoph | last3=Quirrenbach | first3=Andreas | last4=Trifonov | first4=Trifon | last5=Künstler | first5=Andreas | title=Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity | journal=Astronomy & Astrophysics | volume=574 | pages=A116 | year=2015 | bibcode=2015A&A...574A.116R | arxiv=1412.4634 | doi=10.1051/0004-6361/201322360 | postscript=. }}
6. ^1 {{citation | title= Precise radial velocities of giant stars. III. Spectroscopic stellar parameters | journal= Astronomy and Astrophysics | last1=Hekker | first1=S. | last2=Meléndez | first2=J. | volume=475 | issue=3 | pages=1003 | year=2007 | bibcode=2007A&A...475.1003H | arxiv=0709.1145 | doi=10.1051/0004-6361:20078233 | postscript=. }}
7. ^1 2 {{citation | title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system | last1=Gontcharov | first1=G. A. | journal=Astronomy Letters | volume=32 | issue=11 | pages=759–771 | date=2006 | bibcode=2006AstL...32..759G | arxiv=1606.08053 | doi=10.1134/S1063773706110065| postscript=. }}
8. ^1 2 {{citation | last1=Houk | first1=N. | last2=Swift | first2=C. | title=Michigan catalogue of two-dimensional spectral types for the HD Stars | journal=Michigan Spectral Survey | volume=5 | year=1999 | postscript=. | bibcode=1999MSS...C05....0H }}
}}{{Stars of Aquarius}} 7 : G-type giants|Aquarius (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |