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{{about|A2 Aquarii|A1 Aquarii|103 Aquarii|all stars with the same Bayer designation|A Aquarii}}{{Starbox begin
| name = 104 Aquarii
}}{{Starbox observe 2s
| epoch = J2000
| constell = Aquarius
| component1 = A
| ra1 = {{RA|23|41|45.80579}}
| dec1 = {{DEC|–17|48|59.5175}}
| appmag_v1 = 4.83[3]
| component2 = B
| ra2 = {{RA|23|41|46.37788}}
| dec2 = {{DEC|–17|47|00.7237}}
| appmag_v2 = 8.54[3]
}}{{Starbox character
| component = A
| class = G2 Ib/II[7]
| b-v = +0.82[3]
| u-b = +0.49[3]
| variable =
}}{{Starbox character|no_heading=y
| component = B
| class = A5/7 (V)[7]
| b-v = +0.15[3]
| u-b =
| variable =
}}{{Starbox astrometry
| component1 = A
| radial_v = {{Val|+6.52|0.15}}[12]
| prop_mo_ra = +14.872
| prop_mo_dec = +0.862
| parallax = 4.5774
| p_error = 0.1882
| parallax_footnote =
| absmag_v = –2.49[12]
| component2 = B
| radial_v2 =
| prop_mo_ra2 = –27.214
| prop_mo_dec2 = –28.539
| parallax2 = 3.2221
| p_error2 = 0.0487
| parallax_footnote2 =
| absmag_v2 =
}}{{Starbox detail
| component1 = 104 Aqr A
| mass = 4.23[20]
| radius = {{Val|31.9|2.3}}[12]
| gravity = 2.20[12]
| luminosity = 447[20]
| temperature = {{Val|5,444|14|fmt=commas}}[12]
| metal_fe = +0.05[25]
| rotational_velocity = 15[26]
| age_myr = 135[20]
}}{{Starbox catalog
| names= HR 8982, SAO 165836.[28]
| component1=A
| names1=BD −18 6358, HD 222574, HIP 116901
| component2=B
| names2=BD −18 6359, HD 222561, HIP 116904
}}{{Starbox reference
| Simbad = HR+8982
| Simbad2 = HD+222561 |sn2=B
}}{{Starbox end}}104 Aquarii (abbreviated 104 Aqr) is a star in the equatorial constellation of Aquarius. 104 Aquarii is the Flamsteed designation, although it also bears the Bayer designation A2 Aquarii. Based on an annual parallax shift of only {{nowrap|3.89 ± 0.25 milliarcseconds}}, the distance to this star is about {{Convert|840|ly|pc|abbr=off|lk=on}}.[29] At that range, the brightness of the star in the V-band is reduced by 0.10 magnitudes as a result of extinction caused by intervening gas and dust.[20]This is a double star and possible binary system.[31] The primary component has a stellar classification of G2 Ib/II,[7] which places it on the borderline between the bright giant and lower luminosity supergiant stars. It has passed the first dredge-up and may be undergoind Cepheid-like pulsations.[12] With more than four times the mass of the Sun,[20] this is an evolved star that has reached its current stage after only 135 million years.[20] It has expanded to around 51–88[36] times the Sun's radius and is radiating 447–fold[20] the luminosity of the Sun. This energy is being emitted from its outer atmosphere at an effective temperature of 5,478 K,[25] giving it the golden-hued glow of a G-type star.[39] It is a suspected variable star.[40] The companion is a magnitude 7.9 star with an angular separation of 120.1 arcseconds from the primary.[31] References1. ^1 {{citation | first=F. | last=van Leeuwen |date=November 2007| title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 }}
2. ^1 2 {{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}}
3. ^1 2 {{citation | last1=Luck | first1=R. E. | last2=Bond | first2=H. E. | title=The chemical compositions of 26 distant late-type supergiants and the metallicity gradient in the galactic disk | journal=Astrophysical Journal, Part 1 | volume=241 | pages=218–228 | doi=10.1086/158334 | bibcode=1980ApJ...241..218L | postscript=. |date=October 1980}}
4. ^1 2 3 {{cite journal|bibcode= 1988mcts.book.....H |title= Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0 |journal= Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4 |author1= Houk |first1= N. |last2= Smith-Moore |first2= M. |year= 1988 }}
5. ^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=. }}
6. ^1 2 3 4 5 {{cite journal |bibcode=2002yCat.2237....0D |title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system |journal=CDS/ADC Collection of Electronic Catalogues |volume=2237 |author1=Ducati |first1=J. R. |year=2002 }}
7. ^1 2 3 4 5 6 7 {{citation | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | title=Stellar Parameters and Elemental Abundances of Late-G Giants | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 | year=2008 | bibcode=2008PASJ...60..781T | arxiv=0805.2434 | postscript=. | doi=10.1093/pasj/60.4.781}}
8. ^1 {{cite simbad | title=104 Aqr | access-date=2012-07-16 }}
9. ^1 {{citation | display-authors=1 | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics | journal=Astronomy and Astrophysics | volume=367 | issue=2 | pages=521–524 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | postscript=. |date=February 2001}}
10. ^1 {{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 |accessdate=2012-01-16 |postscript=. |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=March 10, 2012 |df= }}
11. ^1 {{citation | display-authors=1 | last1=Demartino | first1=Robert | last2=Kocyla | first2=Dennis | last3=Predom | first3=Christopher | last4=Wetherbee | first4=Edward | title=Accurate Positions Of Suspected Variable Stars Near The South Galactic Pole | journal=Information Bulletin on Variable Stars | volume=4322 | page=1 | bibcode=1996IBVS.4322....1D | postscript=. |date=April 1996}}
12. ^1 2 3 4 5 6 {{citation | title=Spectroscopic studies of four southern-hemisphere G-K supergiants: HD 192876 (α1 Cap), HD 194215 (HR 7801), HD 206834 (c Cap), and HD 222574 (104 Aqr) | last1=Usenko | first1=I. A. | last2=Kniazev | first2=A. Yu. | last3=Berdnikov | first3=L. N. | last4=Kravtsov | first4=V. V. | journal=Astronomy Letters | display-authors=1 | postscript=. | volume=41 | issue=11 | pages=660–676 | date=November 2015 | doi=10.1134/S1063773715110067 | bibcode=2015AstL...41..660U }}
}}External links{{Stars of Aquarius}} 10 : Aquarius (constellation)|Bayer objects|Flamsteed objects|Suspected variables|Double stars|G-type bright giants|Hipparcos objects|HR objects|Henry Draper Catalogue objects|Durchmusterung objects |