Sigma Capricorni

{{Starbox image

| image=

{{Location mark

|image=Capricornus constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=σ Cap

|x=798|y=542

}}

|caption=Location of σ Capricorni (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Capricornus

| ra = {{RA|20|19|23.60402}}

| dec = {{DEC|−19|07|06.6967}}

| appmag_v = +5.31

}}

{{Starbox character

| type =

| class = K2 III

| b-v = +1.43

| u-b = +1.56

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−9.64|0.16}}

| prop_mo_ra = +8.07

| prop_mo_dec = −11.31

| parallax = 3.0609

| p_error = 0.1194

| parallax_footnote =

| absmag_v = −2.38

}}

{{Starbox detail

| source =

| mass = {{Val|6.3|0.7}}

| radius = {{Val|67.5|4.2|6.0}}

| luminosity = {{Val|1392|64|fmt=commas}}

| temperature = {{Val|4292|204|127}}

| gravity =

| metal_fe =

| rotational_velocity =

| age_myr = {{Val|60.5|17.2}}

}}

{{Starbox catalog

| names = {{odlist | B=σ Cap | CD=−19°5776 | FK5=3625 | HD=193150 | HIP=100195 | HR=7761 | SAO=163445 | WDS=J20194-1907A }}

}}

{{Starbox reference

| Simbad = sig+Cap

}}

Sigma Capricorni, Latinized from σ Capricorni, is a solitary star in the southern constellation of Capricornus, 0.5 degree north of the ecliptic. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.31. The star is about 1,070 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −9.6 km/s.

This object is an evolved, K-type giant star with a stellar classification of K2 III. Having exhausted the supply of hydrogen at its core, it has expanded and now has around 67.5 times the girth of the Sun. The star is about 60.5 million years old with 6.3 times the mass of the Sun. It is radiating 1,392 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,292 K.

A magnitude 9.43 visual companion is at an angular separation of {{Val|55.90|ul=arcsecond}} along a position angle of 179°, as of 2016.

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

| 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

| display-authors=1 | last1=Mason | first1=B. D.

| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.

| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.

| title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | year=2014

| volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }}

{{citation

| display-authors=1 | last1=Tetzlaff | first1=N.

| last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.

| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun

| journal=Monthly Notices of the Royal Astronomical Society

| volume=410 | issue=1 | pages=190–200 | date=January 2011

| doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T

| arxiv=1007.4883 | s2cid=118629873 | postscript=. }}

{{citation

| last1=Fernie | first1=J. D. | postscript=.

| title=New UBVRI photometry for 900 supergiants

| journal=Astrophysical Journal Supplement Series

| volume=52 | pages=7–22 | date=May 1983

| doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free }}

{{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

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

{{citation

| title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars

| last1=Houk | first1=N. | last2=Smith-Moore | first2=M.

| volume=4 | year=1988 | postscript=.

| bibcode=1988mcts.book.....H }}

{{cite simbad

| title=* sig Cap

| accessdate=2017-05-12 | postscript=. }}

}}

Category:K-type giants

Capricorni, Sigma

Category:Capricornus

Category:Durchmusterung objects