{{Short description|Star in the constellation Aquila}} {{Starbox begin}} {{Starbox image | image = 250px | caption = A visual band light curve for QS Aquilae. Adapted from Zasche ''et al.'' (2017)<ref name="Zasche"/> }} {{Starbox observe | epoch = J2000 | constell = Aquila | ra = {{RA|19|41|05.528}}<ref name="van Leeuwen2007"/> | dec = {{DEC|+13|48|56.45}}<ref name="van Leeuwen2007"/> | appmag_v = 5.988 }} {{Starbox character | class = B5V | r-i = | v-r = | b-v = −0.08 | u-b = −0.52 | variable = Eclipsing binary<ref name="Zasche2017"/> }} {{Starbox astrometry | radial_v = −14.2 ± 2 | prop_mo_ra = −0.04 ± 0.60<ref name="van Leeuwen2007"/> | prop_mo_dec = −11.47 ± 0.43<ref name="van Leeuwen2007"/> | parallax = 0.49 | p_error = 0.62 | parallax_footnote = <ref name="van Leeuwen2007"/> | absmag_v = }} <!-- {{Starbox detail | mass = | radius = | luminosity = | temperature = | metal = | rotation = | age = }}--> {{Starbox orbit | reference = <ref name="Zasche2017"/> | primary = QS Aquilae AB (eclipsing pair) | name = QS Aquilae C | period = {{val|77.0|4.3}} | axis = {{val|0.111|0.045}} | eccentricity = {{val|0.947|0.038}} | inclination = {{val|61.2|3.6}} | node = {{val|144.5|5.1}} | periastron = {{val|1962.3|2.3}} | periarg = {{val|336.8|4.7}} }} {{Starbox orbit | reference = <ref name="Zasche2017"/> | primary = QS Aquilae A | name = QS Aquilae B | period_unitless = {{val|2.5132987|0.0000075|u=days}} | axis_unitless = {{val|13.78|0.11|u=R⊙}} | eccentricity = <!--Eccentricity--> | inclination = {{val|83.6|1.3}} | node = <!--Longitude of node (in degrees)--> | periastron = <!--Periastron epoch--> | periarg = <!--Argument of periastron (in degrees), secondary --> | periarg_primary = <!--Argument of periastron (in degrees), primary --> | k1 = {{val|73.98|0.33}} | k2 = {{val|201.76|2.09}} }} {{Starbox catalog | names = {{ odlist | name=KUI 93 | 2MASS=J19410553+1348565 | BD=+13°4098 | HD=185936 | HIP=96840 | HR=7486 | V=QS Aql | WDS=J19411+1349 }}<ref name="Simbad"/> }} {{Starbox reference | Simbad = HD+185936 | ARICNS = }} {{Starbox end}} '''QS Aquilae''' is a triple or quadruple star system consisting of an eclipsing binary in a 2.5 day orbit around which a third star orbits in 77 years.<ref name="Zasche2017" /> There is some indication that there is a fourth component with a period of roughly 18 years.<ref>{{Cite journal|last1=Heintze|first1=J.R.W.|last2=Hoekzema|first2=Nico|date=1989|title=The Algol-Type Binary QS AQL|journal=International Astronomical Union Colloquium|volume=107|pages=344–345|doi=10.1017/s0252921100088011|issn=0252-9211|doi-access=free}}</ref> Located in the constellation Aquila, its visual magnitude varies from 5.93 to 6.06, making it barely visible to the naked eye.<ref name="GCVS"/>
The star's variability was discovered photometrically by Paul Guthnick and Richard Prager in 1930. It was given its variable star designation in 1934.<ref name="Guthnick"/>
==References== <references> <ref name="Zasche">{{cite journal |last1=Zasche |first1=P. |last2=Jurysek |first2=J. |last3=Nemravova |first3=J. |last4=Uhlar |first4=R. |last5=Svoboda |first5=P. |last6=Wolf |first6=M. |last7=Honkova |first7=K. |last8=Masek |first8=M. |last9=Prouza |first9=M. |last10=Cechura |first10=J. |last11=Korcakova |first11=D. |last12=Slechta |first12=M. |title=V773 Cas, QS Aql, and BR Ind: Eclipsing Binaries as Parts of Multiple Systems |journal=The Astronomical Journal |date=January 2017 |volume=153 |issue=1 |page=36 |doi=10.3847/1538-3881/153/1/36 |arxiv=1701.02537 |bibcode=2017AJ....153...36Z |s2cid=119024598 |doi-access=free }}</ref>
<ref name="Simbad">{{cite simbad | title=QS Aquilae | access-date=2018-03-08 }}</ref>
<ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | 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 | s2cid=18759600 }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=96513 Vizier catalog entry ] {{Webarchive|url=https://web.archive.org/web/20160304065953/http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=96513 |date=2016-03-04 }}</ref>
<ref name="Zasche2017">{{cite journal | title=V773 Cas, QS Aql, and BR Ind: Eclipsing Binaries as Parts of Multiple Systems | last1=Zasche | first1=P. | last2=Juryšek | first2=J. | last3=Nemravová | first3=J.| last4=Uhlař | first4=R. | last5=Svoboda | first5=P. | last6=Wolf | first6=M. | last7=Hoňková | first7=K. | last8=Mašek | first8=M. | last9=Prouza | first9=M. | last10=Čechura | first10=J. | last11=Korčáková | first11=D. | last12=Šlechta | first12=M. | display-authors=1 | journal=The Astronomical Journal | volume=153 | issue=1 | at=36 | year=2017 | arxiv=1701.02537 | bibcode=2017AJ....153...36Z | doi=10.3847/1538-3881/153/1/36 | s2cid=119024598 | doi-access=free }}</ref>
<ref name="Guthnick">{{cite journal |last1=Guthnick |first1=P. |last2=Prager |first2=R. |title=Benennung von veränderlichen Sternen |journal=Astronomische Nachrichten |date=April 1934 |volume=251 |issue=17 |page=257 |doi=10.1002/asna.19342511702 |bibcode=1934AN....251..257G }}</ref>
<ref name="GCVS">{{cite web |title=QS Aql |url=http://www.sai.msu.su/gcvs/cgi-bin/search2.cgi?search=QS+Aql |website=General Catalog of Variable Stars |publisher=Lomonosov Moscow State University |access-date=13 October 2024}}</ref> </references>
{{Stars of Aquila}}
Category:Aquila (constellation) 185936 Category:Spectroscopic binaries Category:Algol variables Category:Eclipsing binaries Aquilae, QS 7846 Category:B-type main-sequence stars 096840 Category:Durchmusterung objects
{{Multi-star-stub}} {{var-star-stub}}