Omicron Cephei

CCDM J23186+6807C
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Cepheus
Right ascension	23h 18m 37.5s
Declination	+68° 07′ 26″
Apparent magnitude (V)	12.8
Position (relative to A)
Epoch of observation	1912
Angular distance	45.6″
Position angle	4°
Other designations
	STF 3001C, ADS 16666 C, IDS 23145+6734 C, WDS 23186+6807C.
Database references
SIMBAD	data

ο Cephei
Observation data; {{#ifeq:J2000.0\|J2000.0 (ICRS)\|Epoch J2000.0 Equinox J2000.0 (ICRS)\| [[History:Epoch\|Epoch J2000.0]] [[Astronomy:Equinox (celestial coordinates)\|Equinox J2000.0}}
Constellation	Cepheus
	ο Cep A
Right ascension	23h 18m 37.493s
Declination	+68° -6′ 41.20″
Apparent magnitude (V)	4.86
	ο Cep B
Right ascension	23h 18m 37.115s
Declination	+68° 06′ 38.65″
Apparent magnitude (V)	7.13
Characteristics
U−B color index	+0.49
B−V color index	+0.84
R−I color index	+0.45
ο Cep A
Spectral type	G8III
ο Cep B
Spectral type	F6V
Astrometry
ο Cep A
Proper motion (μ)	RA: 54.88 mas/yr ; Dec.: 10.91 mas/yr
Parallax (π)	15.48 ± 0.55 mas
Distance	211 ± 7 ly ; (65 ± 2 pc)
Absolute magnitude (MV)	0.78
ο Cep B
Proper motion (μ)	RA: 45.70 mas/yr ; Dec.: 13.19 mas/yr
Orbit
Period (P)	1505±40 y
Semi-major axis (a)	3.13±0.12 ″
Eccentricity (e)	0.439±0.020
Inclination (i)	16.0±4.0°
Longitude of the node (Ω)	4.5±4.5°
Periastron epoch (T)	B1692 ± 20
Argument of periastron (ω); (secondary)	93.0±20.0°
Details
ο Cep A
Mass	2.35 ± 0.15 M☉
Luminosity	51 L☉
Metallicity [Fe/H]	0.05±0.02 dex
ο Cep B
Mass	1.29 M☉
Other designations
	ο Cep, Omicron Cephei, Omicron Cep, 34 Cephei, 34 Cep, STF 3001AB, ADS 16666 AB, BD+67°1514, CCDM J23186+6807AB, GC 32463, GSC 04478-01361, HD 219916, HIP 115088, HR 8872, IDS 23145+6734 AB, PPM 24360, SAO 20554, WDS 23186+6807AB.
Database references
SIMBAD	data

Short description: Star in the constellation Cepheus

Omicron Cephei, Latinized from ο Cephei, is a binary star in the constellation of Cepheus.^[5] It consists of a less massive F-type main sequence star in orbit with a more massive G-type giant star.^[4] The overall apparent visual magnitude of the system is 4.75.^[2]

The pair was first determined to be binary by F. G. W. Struve in 1832. Since then, the secondary has been seen to revolve approximately 45 degrees around the primary. A number of orbits have been computed, the most recent giving a period of approximately 1500 years.^[4]

Visual companion

There is a visual companion, CCDM J23186+6807C, to the binary star. It has an approximate apparent visual magnitude of 12.8 and is located approximately 45 arcseconds away from it.^[7]^[8]

References

↑ ^1.0 ^1.1 ^1.2 Component 1, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 HR 8872, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 24, 2008.
↑ ^3.0 ^3.1 ^3.2 Component 2, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.
↑ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 Docobo, Jos A. (2003). "Orbit and System Mass for the Visual Binary WDS 23186+6807AB". The Astronomical Journal 126 (3): 1522–1525. doi:10.1086/377319. Bibcode: 2003AJ....126.1522D. .
↑ ^5.0 ^5.1 ^5.2 "* omi Cep". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+omi+Cep.
↑ ^6.0 ^6.1 ^6.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
↑ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 Entry 23186+6807, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line November 24, 2008.
↑ ^8.0 ^8.1 ^8.2 ^8.3 ^8.4 "UCAC3 317-95637". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UCAC3+317-95637.

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Original source: https://en.wikipedia.org/wiki/Omicron Cephei. Read more

[viziera-1] 1.0 ^1.1 ^1.2 Component 1, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.

[bsc2-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 HR 8872, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 24, 2008.

[vizierb-3] 3.0 ^3.1 ^3.2 Component 2, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.

[docobo03-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 Docobo, Jos A. (2003). "Orbit and System Mass for the Visual Binary WDS 23186+6807AB". The Astronomical Journal 126 (3): 1522–1525. doi:10.1086/377319. Bibcode: 2003AJ....126.1522D. .

[sb0-5] 5.0 ^5.1 ^5.2 "* omi Cep". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+omi+Cep.

[Anderson2012-6] 6.0 ^6.1 ^6.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.

[wds-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 Entry 23186+6807, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line November 24, 2008.

[sb1-8] 8.0 ^8.1 ^8.2 ^8.3 ^8.4 "UCAC3 317-95637". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UCAC3+317-95637.

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Observation data {{#ifeq:J2000.0\|J2000.0 (ICRS)\|Epoch J2000.0 Equinox J2000.0 (ICRS)\| [[History:Epoch\|Epoch J2000.0]] [[Astronomy:Equinox (celestial coordinates)\|Equinox J2000.0}}
Constellation	Cepheus
ο Cep A
Right ascension	23^h 18^m 37.493^s
Declination	+68° -6′ 41.20″^[1]
Apparent magnitude (V)	4.86^[2]
ο Cep B
Right ascension	23^h 18^m 37.115^s
Declination	+68° 06′ 38.65″^[3]
Apparent magnitude (V)	7.13^[2]
Characteristics
U−B color index	+0.49^[2]
B−V color index	+0.84^[2]
R−I color index	+0.45^[2]

ο Cep A
Spectral type	G8III^[4]
ο Cep B
Spectral type	F6V^[2]
Astrometry
ο Cep A
Proper motion (μ)	RA: 54.88^[1] mas/yr Dec.: 10.91^[1] mas/yr
Parallax (π)	15.48 ± 0.55^[5] mas
Distance	211 ± 7 ly (65 ± 2 pc)
Absolute magnitude (M_V)	0.78^[6]
ο Cep B
Proper motion (μ)	RA: 45.70^[3] mas/yr Dec.: 13.19^[3] mas/yr
Orbit^[4]
Period (P)	1505±40 y
Semi-major axis (a)	3.13±0.12 ″
Eccentricity (e)	0.439±0.020
Inclination (i)	16.0±4.0°
Longitude of the node (Ω)	4.5±4.5°
Periastron epoch (T)	B1692 ± 20
Argument of periastron (ω) (secondary)	93.0±20.0°
Details
ο Cep A
Mass	2.35 ± 0.15^[4] `M`_☉
Luminosity	51^[6] `L`_☉
Metallicity [Fe/H]	0.05±0.02^[6] dex
ο Cep B
Mass	1.29^[4] `M`_☉
Other designations
ο Cep, Omicron Cephei, Omicron Cep, 34 Cephei, 34 Cep, STF 3001AB, ADS 16666 AB, BD+67°1514, CCDM J23186+6807AB, GC 32463, GSC 04478-01361, HD 219916, HIP 115088, HR 8872, IDS 23145+6734 AB, PPM 24360, SAO 20554, WDS 23186+6807AB.^[5]^[7]
Database references
SIMBAD	data

Observation data Equinox J2000.0]] (ICRS)
Constellation	Cepheus
Right ascension	23^h 18^m 37.5^s^[8]
Declination	+68° 07′ 26″^[8]
Apparent magnitude (V)	12.8^[8]
Position (relative to A)
Epoch of observation	1912
Angular distance	45.6″ ^[7]
Position angle	4° ^[7]
Other designations
STF 3001C, ADS 16666 C, IDS 23145+6734 C, WDS 23186+6807C.^[7]^[8]
Database references
SIMBAD	data

Omicron Cephei

Topic: Astronomy

Visual companion

References