Omicron Cephei

Short description: Star in the constellation Cepheus

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° 06′ 41.20″[1]
Apparent magnitude (V) | 4.86[2]
ο Cep B
Right ascension |  23h 18m 37.115s
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 (MV)| 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

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

CCDM J23186+6807C  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Cepheus
Right ascension |  23h 18m 37.5s[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

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. ↑ 1.0 1.1 1.2 Component 1, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.
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.
3. ↑ 3.0 3.1 3.2 Component 2, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.
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. .
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=*+omi+Cep.
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.
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.
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.

* v
* t
* e

Cepheus constellation

Stars (list)|

| Bayer|

* α (Alderamin)
* β (Alfirk)
* γ (Errai)
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ (Garnet Star)
* ν
* ξ (Kurhah)
* ο
* π
* ρ1
* ρ2

|

Flamsteed|

* 4
* 6
* 7
* 9
* 11
* 12
* 13
* 14
* 15
* 16
* 18
* 19
* 20
* 24
* 25
* 26
* 30
* 31
* 77 Dra
* 78 Dra
* 79 Dra
* 80 Dra
* 2 UMi

Variable|

* S
* T
* U
* V
* W
* RW
* RZ
* SV
* VV
* VW
* WX
* WZ
* XX
* XZ
* ZZ
* AH
* AK
* BH
* BO
* CP
* CQ
* CR
* CW
* CX
* DH
* DI
* DO
* DQ
* EE
* EG
* EI
* EK
* EM
* GP
* GW
* IL
* IR
* IV
* NY
* OV
* PQ
* PV
* V350
* V354
* V368
* V374
* V379
* V380
* V381
* V388
* V398
* V408
* V414
* V419
* V421
* V422
* V426
* V431
* V438
* V444
* V458

HR|

* 20
* 55
* 158
* 240
* 306
* 312
* 333
* 357
* 386
* 572
* 597
* 774
* 881
* 906
* 961
* 965
* 1107
* 1304
* 1317
* 1523
* 1616
* 1885
* 7742
* 7925
* 7938
* 7955
* 7967
* 7993
* 8029
* 8043
* 8049
* 8065
* 8099
* 8119
* 8133
* 8150
* 8168
* 8174
* 8179
* 8226
* 8239
* 8243
* 8281
* 8312
* 8327
* 8342
* 8347
* 8357
* 8374
* 8375
* 8384
* 8388
* 8395
* 8442
* 8472
* 8474
* 8476
* 8479
* 8483
* 8490
* 8493
* 8506
* 8535
* 8537
* 8546
* 8557
* 8568
* 8595
* 8598
* 8599
* 8625
* 8677
* 8683
* 8687
* 8696
* 8702
* 8707
* 8736
* 8745
* 8748
* 8779
* 8808
* 8811
* 8844
* 8867
* 8918
* 8938
* 8952
* 8971
* 8972
* 9005
* 9013
* 9038
* 9104

HD|

* 12918
* 12927
* 25904
* 200775
* 204521
* 204827
* 207538
* 207826
* 208132
* 208392
* 212136
* 215588
* 217903
* 224890

Gliese|

* Gliese 48
* Gliese 809
* GJ 1277

Other|

* Cepheus A HW 2
* Cepheus X-4
* IRAS 21391+5802
* Kruger 60
* NGC 7538 IRS 1
* NGC 7538 IRS 9
* OH 104.9+2.4
* PSR B2224+65
* PSR J2229+6114
* S140 IRS 1
* TYC 3980-1081-1
* 4U 2206+54
* WISE 0313+7807
* WR 152
* WR 156

Star clusters|

| Association|

* Cepheus OB2
* Cepheus OB3
* Cepheus OB4

|

Open|

* NGC 188
* NGC 6939
* NGC 7023
* NGC 7129
* NGC 7142
* NGC 7160
* NGC 7226
* NGC 7234
* NGC 7261
* NGC 7281
* NGC 7380
* NGC 7419
* NGC 7423
* NGC 7429
* NGC 7510
* NGC 7762
* S 140
* Trumpler 37

Globular|

* Palomar 1

Molecular clouds|

* Cepheus A
* Cepheus B
* Cepheus C

Nebulae|

| Dark|

* Barnard 150
* CB 244
* Elephant's Trunk Nebula
* IC 1396N
* L1157
* L1228

|

H II|

* IC 1396
* NGC 7538
* NGC 7822
* S 128
* S 140
* S 155
* S 156

Reflection|

* Ghost Nebula
* Iris Nebula
* NGC 7129
* VdB 157

Planetary|

* NGC 40
* NGC 7076
* NGC 7139
* NGC 7354

SNR|

* CTA 1
* SSTGFLS J222557+601148

Galaxies|

| NGC|

* 1184
* 1544
* 2276
* 2300
* 6949
* 6952

|

Other|

* 3C 61.1
* 3C 427.1
* 4C +74.26
* QSO B2021+614
* S5 0014+81

Other|

* GRB 980519
* SN 2008S

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