Rho2 Cephei

{{other stars by Bayer designation|Rho Cephei{{!}}ρ Cephei}}

{{Starbox begin

| name = Rho² Cephei

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Cepheus

| ra = {{RA|22|29|52.97918}}

| dec = {{DEC|+78|49|27.4282}}

| appmag_v = 5.50

}}

{{Starbox character

| class = A3 V

| b-v = +0.06

| u-b = +0.07

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = +3.68

| prop_mo_dec = −21.29

| parallax = 13.31

| p_error = 0.21

| parallax_footnote =

| absmag_v = +1.07

}}

{{Starbox detail

| source =

| mass = {{Val|2.23|0.03}}

| radius =

| luminosity = 32

| temperature = 8,511

| gravity = 4.2

| metal_fe =

| rotational_velocity = 133

| age_myr = 85

}}

{{Starbox catalog

| names = Cephei, ρ² Cep, 29 Cephei, BD+78° 801, FK5 1593, HD 213798, HIP 111056, HR 8591, SAO 10402

}}

{{Starbox reference

| Simbad = 29+Cep

}}

Rho² Cephei, Latinized from ρ² Cephei, or simply ρ Cephei, is a solitary star in the northern constellation of Cepheus. With an apparent visual magnitude of 5.50, it is faintly visible to the naked eye, forming an optical pair with Rho¹ Cephei. Based upon an annual parallax shift of 13.31 mas as seen from the Earth, it is located about 245 light years from the Sun.

Rho² Cephei is an A-type main sequence star with a stellar classification of A3 V, estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s. The effective temperature of its photosphere is {{val|8,511|ul=K|fmt=commas}} and its bolometric luminosity, the total amount of radiation it emits at all wavelengths, is {{solar luminosity|32|link=y}}.

References

{{reflist|refs=

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation

| last1=Zorec | first1=J. | last2=Royer | first2=F.

| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities

| journal=Astronomy & Astrophysics

| volume=537 | page=A120 | date=January 2012

| doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z

| postscript=. | arxiv=1201.2052 | s2cid=55586789 }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| 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=. }}

{{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 | date=September 2008

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E

| postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}

{{citation | display-authors=1

| last1=Cowley | first1=A. | last2=Cowley | first2=C.

| last3=Jaschek | first3=M. | last4=Jaschek | first4=C.

| title=A study of the bright A stars. I. A catalogue of spectral classifications

| journal=Astronomical Journal | postscript=.

| volume=74 | pages=375–406 | date=April 1969

| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}

{{citation

| display-authors=1 | last1=Royer | first1=F.

| last2=Zorec | first2=J. | last3=Gómez | first3=A. E.

| title=Rotational velocities of A-type stars. III. Velocity distributions

| journal=Astronomy and Astrophysics

| volume=463 | issue=2 | pages=671–682 | date=February 2007

| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R

| arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}

{{citation

| title=UBV photometry of FK4 and FK4 supplement stars

| last1=Oja | first1=T.

| journal=Astronomy and Astrophysics Supplement Series

| volume=52 | pages=131–134 | date=April 1983

| bibcode=1983A&AS...52..131O | postscript=. }}

{{citation

| title=rho Cep -- Star

| work=SIMBAD Astronomical Database

| publisher=Centre de Données astronomiques de Strasbourg

| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=rho02+Cep

| accessdate=2017-05-05 | postscript=. }}

{{cite journal

| bibcode=2016AJ....152...40G | title=The Close Companion Mass-ratio Distribution of Intermediate-mass Stars | journal=The Astronomical Journal | volume=152 | issue=2 | pages=40 | last1=Gullikson | first1=Kevin | last2=Kraus | first2=Adam | last3=Dodson-Robinson | first3=Sarah | year=2016 | arxiv=1604.06456 | doi=10.3847/0004-6256/152/2/40| s2cid=119179065 | doi-access=free }}

}}

Cephei, Rho2

Category:Cepheus (constellation)

Cephei, Rho2

Category:Durchmusterung objects