Omicron Capricorni

{{Starbox begin

| name = Omicron 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=ο Cap

|x=720|y=522

}}

|caption=Location of ο Capricorni (circled)

}}

{{Starbox observe 2s

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Capricornus

| component1 = ο Cap A

| ra1 = {{RA|20|29|53.91117}}

| dec1 = {{DEC|−18|34|59.4803}}

| appmag_v1 = +5.94

| component2 = ο Cap B

| ra2 = {{RA|20|29|52.59487}}

| dec2 = {{DEC|−18|35|10.7447}}

| appmag_v2 = +6.74

}}

{{Starbox character

| component1 = ο Cap A

| class = A1 V

| b-v = +0.08

| u-b = +0.30

| variable =

| component2 = ο Cap B

| class2 = A7/8 V

| b-v2 = +0.22

| u-b2 = +0.04

| variable2 =

}}

{{Starbox astrometry

| component1 = ο Cap A

| radial_v = {{Val|−12.4|1.3}}

| prop_mo_ra = +31.70

| prop_mo_dec = −83.18

| parallax = 15.07

| p_error = 4.14

| parallax_footnote =

| absmag_v =

| component2 = ο Cap B

| radial_v2 = {{Val|−9.1|0.6}}

| prop_mo_ra2 = +33.31

| prop_mo_dec2 = −66.16

| parallax2 =

| p_error2 =

| parallax_footnote2 =

| absmag_v2 =

}}

{{Starbox detail

| source =

| component1 = ο Cap A

| mass = {{Val|2.05|0.20}}

| radius =

| luminosity = 18.6

| temperature = {{Val|10492|357|fmt=commas}}

| gravity = 4.23

| metal_fe =

| rotational_velocity = 276

| age_myr = 118

| component2 = ο Cap B

| mass2 = {{Val|1.34|0.24}}

| temperature2 = 7,762

| rotational_velocity2 = 136

}}

{{Starbox catalog

| names = {{odlist | B=ο Cap | F=12 Cap | ADS=13902 | CCDM=J20299-1835 }}

| component1 = ο Cap A

| names1 = {{odlist | BD=−19° 5831 | HD=195094 | HIP=101123 | HR=7830 | SAO=163626 | GC=28503 }}

| component2 = ο Cap B

| names2 = {{odlist | BD=−19° 5830 | HD=195093 | HIP=101120 | HR=7829 | SAO=163625 | GC=28502 }}

}}

{{Starbox reference

| Simbad = omi+Cap+A | sn=A

| Simbad2 = omi+Cap+B | sn2=B

}}

Omicron Capricorni (ο Capricorni) is a wide binary star system in the constellation Capricornus.{{cite book|title=Sky and Telescope |author= Harvard College Observatory|year= 1941|publisher=Stanford University}} The brighter component has an apparent visual magnitude of +5.94, which is near the lower limit on stellar brightness that still can be seen with the naked eye. Based upon an annual parallax shift of 15.07 mas as seen from Earth, this system is located roughly 220 light-years from the Sun. Large but uncertain discrepancies in the parallax measurements from Hipparcos may indicate, weakly, that there is a third, unseen companion in the system.

Both visible components are white-hued A-type main-sequence stars. The primary, component A, sometimes called ο¹ Capricorni, has an apparent magnitude of +5.94, while the companion, component B or ο² Capricorni, has an apparent magnitude of +6.74. The two stars are currently separated by 21.91 arcseconds, corresponding to a projected separation of around {{Val|2100|fmt=commas|ul=AU}}. At the estimated age of around 118 million years old, both components are spinning rapidly: component A has a projected rotational velocity of 276 km/s, while component B is 136 km/s.

References

{{reflist|refs=

{{citation

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| 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

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| volume=331 | page=922 | date=August 1988

| doi=10.1086/166609 | bibcode=1988ApJ...331..922A }}

{{citation

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| doi-access=free | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

{{citation

| last1=Gontcharov | first1=G. A.

| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system

| journal=Astronomy Letters | postscript=.

| volume=32| issue=11| pages=759–771| date=November 2006

| doi = 10.1134/S1063773706110065| bibcode=2006AstL...32..759G |arxiv = 1606.08053 | s2cid=119231169

}}

{{citation

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

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

| journal=The Astrophysical Journal

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

| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146

| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}

{{citation

| 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