o Cephei
catalogues and names
| catalogues and names | o Cep, NSV 14495, 34 Cep, HR 8872, HD 219916, SAO 20554, BD +67 1514, WDS 23186+6807A |
| constellation | Cepheus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 23h 18min 37.5sec | DEC: +68° 6' 42'' | ||
| position (B1900) | RA: 23h 14min 30.9sec | DEC: +67° 33' 52'' | ||
| proper motion (J2000) | RA: 0.058 arcsec/a | DEC: 0.016 arcsec/a | ||
| radial velocity | -18 km/s note: suspected variable radial velocity |
|||
| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.024 arcsec | |||
| galactic coordinates | longitude: 114.42° | latitude: 6.79° | ||
| note (category: dynamical parallaxes): | 0.018". |
magnitude
| visual magnitude | 4.75 (V on UBV Johnson system) |
spectral / color information
| spectral class | K0III |
| B-V-magnitude | 0.84 |
| U-B-magnitude | 0.49 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 14495 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 3.1 arcsec |
| mag difference (of double or brightest multiple) | 2.3 |
| component ID | AB |
| note (category: double and multiple data): | AB 4.86 K0III, 7.13 F6V, 796.16y, a = 2.991". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 23h 18min 37.494sec | DEC: +68° 6' 41.09'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0098 arcsec/a | DEC: 0.008 arcsec/a | source: 25 | |
| radial velocity | -18 km/s | source: 25 | ||
| trigonometric parallax | 0.024 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 114.43° | latitude: 6.79° | ||
magnitude:
| visual | 4.75 (observed) | source: 25 |
| photovisual | 4.9 | source: 2 |
| photographic | 5.7 | source: 16 |
spectral information:
| spectral class | G5 | source: 96 | |
| Morgan-Keenan | G8.5III-IIIbFe-0.5 | source: 25 | |
| B-magnitude | 5.59 ±0.05 | B-V-magnitude | 0.84 |
| U-magnitude | 6.08 ±0.05 | U-B-magnitude | 0.49 |
double/multiple star system information:
| separation between brightest and second brightest component | 3.1 arcsec |
| magnitude difference between brightest and second brightest component | 2 |
| position angle | 218 ° |
sources:
| 2 | HD and HDE Catalogs |
| Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 19 | WDS Catalog |
| Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996 | |
| 25 | Bright Star Catalogue, 5th edition |
| Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
| 96 | SAO or HD/HDE Catalog |
| Reference from Value 1 or Reference from Value 2 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 23h 16min 33.63sec | DEC: +67° 50' 16.12'' | ±0.012 arcsec |
| position (J2000) | RA: 23h 18min 37.549sec | DEC: +68° 6' 41.7'' | |
| proper motion B1950 (FK4) | RA: 0.0102 arcsec/a | DEC: 0.022 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0105 arcsec/a | DEC: 0.016 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | G5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
| source catalogue | GC, catalogue number: 32463 |
| Durchmusterung | BD+67 1514 |
| Boss General Catalogue | 32463 |
| Henry Draper Catalogue | 219916 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 23h 18.6min | DEC: +68° 7' |
| proper motion (J2000) | RA: 0.055 arcsec/a | DEC: 0.008 arcsec/a |
double/multiple star system information:
| component | year | number of measures | position angle | angular separation | magnitude of 1st component | magnitude of 2nd component | spectral class(es) | discoverer code |
| AB | 1832 | often | 175° | 2.4'' | 4.8 | 6.8 | G8III | STF3001 |
| 1989 | 218° | 3.1'' | ||||||
| AC | 1912 | 1 | 4° | 45.6'' | 4.9 | 12.8 | - | STF3001 |
discoverer information:
| discoverer code | discoverer | reference |
| STF3001 | Struve, F.G.W. | - |
notes:
| note | Omicron Cep. A premature orbit has been computed. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 23h 14.5min | DEC: +67° 34' |
magnitudes, spectral classes, orbital elements:
| author: | S. Wierzbinski |
| date of observation: | 1953 |
| magnitude of component A: | 4.86 |
| magnitude of component B: | 4.86 |
| spectral class component B: | G8III |
| spectral class component B: | G8III |
| period [y]: | 796.16 |
| semi-major axis [arcsec]: | 2.991 |
| inclination [deg]: | 58.24 |
| node [deg]: | 37.91 |
| equinox of node: | 1900 |
| eccentricity: | 0.171 |
| time of periastron passage: | 2134.38 |
| dates of ephemeris: | 1950-1970 |
| grade: | indeterminate |
| reference: | Acta Astron. 6, 88; 1956. |
| notes | Omicron Cep. |
| other name(s) | STF 3001, Omicron Cep |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 23h 16min 33.6sec | DEC: +67° 50' 16'' |
variability informations:
| magnitute at max. brightness | 4.71 |
| magnitute at min. brightness | 4.76 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K0 |
references
| to a study | 261595D (designation: OMICR.CEP) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |