|
}}
{{Starbox orbit
| reference = <ref name=Hartkopf2006Pourbaix2004/>
| period_unitless = 1.9642 d
| eccentricity = 0.00
}}
{{Starbox end}}
'''Pi Cassiopeiae''' (π Cas, π Cassiopeiae) is a close [[binary star]]<ref name=Pourbaix2004/> system in the [[constellation]] [[Cassiopeia (constellation)|Cassiopeia]]. It is visible to the naked eye with an [[apparent visual magnitude]] of +4.949.<ref name=Hog2000/> Based upon an annual [[stellar parallax|parallax shift]] of 18.63 [[milliarcsecond|mas]] as seen from Earth,<ref name=vanLeeuwen2007/> this system is located about 175 [[light year]]s from the [[Sun]].
This is a double-lined [[spectroscopic binary]] system with an [[orbital period]] of nearly two days in a circular orbit.<ref name=Hartkopf2006Pourbaix2004/> It is classified as a [[Rotating ellipsoidal variable|rotating ellipsoidal]] [[variable star]] and its brightness varies by 0.02 magnitudes with a period of 23.57 hours,<ref name=Samus2017/> which equals half of its orbital period. The [[spectrum]] matches that of an [[A-type main-sequence star]] with a [[stellar classification]] of A5 V.<ref name=Cowley1969/>
==References==
| doi=10.1088/0004-637X/804/2/146 | postscript=. }}</ref>
<ref name=Hartkopf2006Pourbaix2004>{{citation
| display-authors=1 | lastlast1=Hartkopf Pourbaix | firstfirst1=W. ID.
| last2=MasonTokovinin | first2=BA. DA. | last3=WorleyBatten | first3=CA. EH.
| last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I.
| title=Sixth Catalog of Orbits of Visual Binary Stars
| last6=Levato | first6=H. | last7=Morrell | first7=N. I.
| publisher=United States Naval Observatory | date=June 30, 2006
| last8=Torres | first8=G. | last9=Udry | first9=S.
| url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6
| year=2004 | pages=727–732 | volume=424
| accessdate=2017-06-02 | postscript=. }}</ref>
| title=SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
| journal=Astronomy & Astrophysics | postscript=.
| bibcode=2009yCat....102020P | doi=10.1051/0004-6361:20041213 }}</ref>
<ref name=SIMBAD>{{cite simbad
| 