Kappa Cephei

{{Starbox observe

| epoch = J2000

| constell = Cepheus

| ra = {{RA|20|08|53.34492}}

| dec = {{DEC|+77|42|41.0909}}

| appmag_v = 4.39

}}

{{Starbox character

| class = B9III + A7V

| b-v = -0.05

| u-b = -0.11

}}

{{Starbox astrometry

| absmag_v = −0.54

}}

{{Starbox astrometry|no_heading=y

| component1 = Kap Cep A

| radial_v = {{Val|−22.8|0.9}}

| prop_mo_ra = +12.044

| prop_mo_dec = +26.199

| parallax = 10.0861

| p_error = 0.2468

| parallax_footnote =

| absmag_v =

}}

{{Starbox astrometry|no_heading=y

| component1 = Kap Cep B

| radial_v = {{Val|−15.3|5}}

| prop_mo_ra = {{Val|+10.725|0.047}}

| prop_mo_dec = {{Val|+25.543|0.056}}

| parallax = 9.9981

| p_error = 0.0290

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| component1 = Kap Cep A

| mass = {{val|3.02|0.5}}

| radius = {{Val|4.45|0.22}}

| luminosity = 191

| temperature = {{Val|10174|55|fmt=commas}}

| metal_fe = −0.05

| gravity = {{Val|3.66|0.03}}

| rotational_velocity =

| age_myr = {{val|302|77|72}}

| component2 = Kap Cep B

| radius2 = 1.32

| luminosity2 = 4.05

| temperature2 = 7119

}}

{{Starbox catalog

| names = {{odlist | B=κ Cep | F=1 Cephei | BD=+77°764 | HD=192907 | HIP=99255 | HR=7750 | SAO=9665 | GSC=04589-03106 }}

}}

{{Starbox reference

| Simbad=kap+Cep

| Simbad2=Kap+Cep+B|sn2=B

| Simbad3=BD%2b77+763|sn3=C

}}

Kappa Cephei, Latinized from κ Cephei, is a binary star system in the northern circumpolar constellation of Cepheus. It is visible to the naked eye as a faint, blue white-hued point of light with an apparent visual magnitude is 4.39. The system is located approximately 323–326 light years distant from the Sun, based on parallax.

The two gravitationally-bound members of this system had an angular separation of {{Val|7.3|ul=arcsecond}} along a position angle of 120°, as of 2015. The primary, designated component A, has a stellar classification of B9III, matching a blue giant. The magnitude 8.34 secondary, component B, is an A-type main-sequence star of class A7V. A third star of 10th magnitude, BD+77 763, is listed as component C in the Washington Double Star Catalog although it is a background object unrelated to the other two.

References

{{reflist|refs=

{{cite journal

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| title=A spectroscopic investigation of visual binaries with B-type primaries

| journal=The Astronomical Journal

| volume=74 | pages=1082 | year=1969

| bibcode=1969AJ.....74.1082M | doi=10.1086/110908| doi-access=free}}

{{Cite journal

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{{cite journal

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| bibcode=2005AJ....129.1642F | s2cid=119512018 }}

{{citation

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| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{cite journal

| last1=Evans | first1=D. S.

| title=The Revision of the General Catalogue of Radial Velocities

| journal=Determination of Radial Velocities and Their Applications

| volume=30 | pages=57 | year=1967

| bibcode=1967IAUS...30...57E }}

{{cite journal

| last1=Hoffleit | first1=D. | last2=Warren | first2=W. H.

| title=VizieR On-line Data Catalog: Bright Star Catalogue

| journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H

| volume=5050 | year=1995 | edition=5th Revised

| bibcode=1995yCat.5050....0H }}

{{cite journal

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| title=The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| bibcode=2015ApJ...804..146D | arxiv=1501.03154 | doi=10.1088/0004-637x/804/2/146| s2cid=33401607 }}

}}

Category:A-type main-sequence stars

Category:B-type giants

Category:Binary stars

Category:Cepheus (constellation)

Cephei, Kappa

Category:Durchmusterung objects