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pi Cephei

{{Short description|Star in the constellation Cepheus}}

{{Starbox begin

| name = π Cephei

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|23|07|53.854}}

| dec = {{DEC|+75|23|15.00}}

| appmag_v = 4.419 {{nowrap|4.61 + 6.75)}}

| constell = Cepheus

}}

{{Starbox character

| class = {{nowrap|G7III / F5V / A7V-A9V}}

| b-v = 0.8

| u-b = -0.46

| variable =

}}

{{Starbox astrometry

| radial_v = -18.6 ± 0.9

| prop_mo_ra = 6.81 ± 1.05

| prop_mo_dec = -34.06 ± 0.88

| parallax = 13.8

| p_error = 0.41

| parallax_footnote =

| absmag_v = 0.24

}}

{{Starbox orbit

| reference =

| primary = π Cep Aa

| name = π Cep Ab

| period_unitless = 556.72 ± 0.05 d

| axis_unitless = 39.0 ± 3.9 mas

| eccentricity = 0.297 ± 0.006

| inclination = 99.0 ± 2.5

| node = 109.2 ± 3.5

| periastron = 2,439,172.9 ± 1.6

| periarg = 7.6 ± 1.2

| k1 = 24.18 ± 0.15

}}

{{Starbox orbit

| reference = {{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|access-date=3 June 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6}}

| primary = π Cephei A (Aa + Ab)

| name = π Cephei B

| period = 162.8 ± 2.8

| axis = 0.810 ± 0.050

| eccentricity = 0.5968 ± 0.0067

| inclination = 30.0 ± 3.0

| node = 90.3 ± 4.9

| periastron = B 1934.573 ± 0.35

| periarg = 90.0 ± 4.4

}}

{{Starbox detail

| source =

| component1 = π Cep Aa

| mass = 3.63 ± 0.53

| temperature = {{val|5,226|92|fmt=commas}}

| gravity = {{val|3.05|0.11}}

| metal_fe = {{val|0.29|0.05}}

| age_myr = 100

| component2 = π Cep Ab

| mass2 = 3.27 ± 0.48

}}

{{Starbox detail | no_heading=y

| component1 = π Cep B

| mass = 1.93 ± 0.23

}}

{{Starbox catalog

| names = HD 218658, HR 8819, 33 Cephei, BD+74° 1006, SAO 10629, HIP 114222

}}

{{Starbox reference

| Simbad = pi+Cep

}}

{{Starbox end}}

Pi Cephei (π Cephei) is a trinary star located in the constellation Cepheus. With a combined apparent magnitude of about 4.4, the system is faintly visible to the naked eye. The inner pair of stars orbits in 1.5 years while the outer companion completes one orbit in about 160 years.

Pi Cephei was found to have a visual companion star by Otto Wilhelm von Struve in 1843. That the primary is itself a spectroscopic binary was first noticed by William Wallace Campbell in 1901 using photographic plates taken at Lick Observatory.

References

{{reflist|refs=

{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|access-date=3 June 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6}}

{{cite journal | title=Some recent results secured with the Mills spectrograph | last1=Campbell | first1=William Wallace | journal=Lick Observatory Bulletin | volume=1 | issue=4 | pages=22–25 | year=1901 | bibcode=1901LicOB...1...22C | doi=10.5479/ADS/bib/1901LicOB.1.22C | doi-access=free }}

{{cite journal | title=Hipparcos and MAP Studies of the Triple Star π Cephei | last1=Gatewood | first1=George | last2=Han | first2=Inwoo | last3=de Jonge | first3=Joost Kiewiet | last4=Reiland | first4=C. Thomas | display-authors=1 | journal=The Astrophysical Journal | volume=549 | issue=2 | pages=1145–1150 | year=2001 | bibcode=2001ApJ...549.1145G | doi=10.1086/319458 | doi-access=free }}

{{cite journal | title=Uvbybeta photoelectric photometric catalogue | last1=Hauck | first1=B. | last2=Mermilliod | first2=M. | journal=Astronomy and Astrophysics Supplement | volume=129 | issue=3 | pages=431–433 | year=1998 | bibcode=1998A&AS..129..431H | doi=10.1051/aas:1998195 | doi-access=free }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=II/215/catalog&recno=61489 Vizier catalog entry ]

{{cite journal | title=Revised orbits for 105 Herculis and Pi Cephei A and a model for the Pi Cephei system | last1=Scarfe | first1=C. D. | last2=Regan | first2=J. | last3=Barlow | first3=D. | last4=Fekel | first4=F. C. Jr. | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=203 | pages=103–116 | year=1983 | bibcode=1983MNRAS.203..103S | doi = 10.1093/mnras/203.1.103 | doi-access=free }}

{{cite simbad | title=* pi. Cep | accessdate=2013-09-01}}

{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | 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=113837 Vizier catalog entry ]

{{cite journal|bibcode=2016ApJ...817...40F|title=Determining Ages of APOGEE Giants with Known Distances|journal=The Astrophysical Journal|volume=817|issue=1|page=40|last1=Feuillet|first1=Diane K.|last2=Bovy|first2=Jo|last3=Holtzman|first3=Jon|last4=Girardi|first4=Léo|last5=MacDonald|first5=Nick|last6=Majewski|first6=Steven R.|last7=Nidever|first7=David L.|year=2016|doi=10.3847/0004-637X/817/1/40|arxiv=1511.04088|s2cid=118675933 |doi-access=free }}

{{cite journal|bibcode= 2000A&A...355L..27H |title= The Tycho-2 catalogue of the 2.5 million brightest stars |journal= Astronomy and Astrophysics |volume= 355 |pages= L27 |last1= Høg |first1= E. |last2= Fabricius |first2= C. |last3= Makarov |first3= V. V. |last4= Urban |first4= S. |last5= Corbin |first5= T. |last6= Wycoff |first6= G. |last7= Bastian |first7= U. |last8= Schwekendiek |first8= P. |last9= Wicenec |first9= A. |year= 2000 }}

{{cite journal|bibcode=2002A&A...384..180F|title=The Tycho double star catalogue|journal=Astronomy and Astrophysics|volume=384|pages=180–189|last1=Fabricius|first1=C.|last2=Høg|first2=E.|last3=Makarov|first3=V. V.|last4=Mason|first4=B. D.|last5=Wycoff|first5=G. L.|last6=Urban|first6=S. E.|year=2002|doi=10.1051/0004-6361:20011822|doi-access=free}}

}}

{{Stars of Cepheus}}

{{DEFAULTSORT:Pi Cephei}}

Category:Spectroscopic binaries

Category:Triple star systems

Category:Cepheus (constellation)

Cephei, Pi

Cephei, 33

Category:G-type giants

Category:F-type main-sequence stars

Category:A-type main-sequence stars

114222

218658

8819

Category:Durchmusterung objects