g Cephei
| catalogues and names | g Cep, NSV 14656, 35 Cep, HR 8974, HD 222404, SAO 10818, FK5: 893 |
| constellation | Cepheus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Alrai; Arrai; Errai; Er Rai. |
position, motion, parallax:
| position (J2000) | RA: 23h 39min 20,8sec | DEC: +77° 37' 57'' |
| position (J1900) | RA: 23h 35min 14,3sec | DEC: +77° 4' 27'' |
| proper motion (J2000) | RA: -0,067 arcsec/a | DEC: 0,151 arcsec/a |
| radial velocity | -42 km/s note: suspected variable radial velocity |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,064 arcsec | |
magnitude
| visual magnitude | 3,21 (V on UBV Johnson system) |
spectral / color information
| spectral class | K1III-IV |
| B-V-magnitude | 1,03 |
| U-B-magnitude | 0,94 |
| R-I-magnitude | 0,51 |
variability information
| variable star identification | 14656 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 23h 39min 20,824sec | DEC: +77° 37' 56,8'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,021 arcsec/a | DEC: 0,151 arcsec/a | source: 25 | |
| radial velocity | -42 km/s | source: 25 | ||
| trigonometric parallax | 0,064 | ±0,006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 119° | latitude: 15,31° | ||
| GCI unit vector (J2000) | X: 0,213313 | Y: -0,019275 | Z: 0,976794 | |
magnitude:
| visual | 3,21 (observed) | source: 25 |
| photovisual | 3,4 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K1III-IVCN1 | source: 25 | |
| B-magnitude | 4,24 ±0,05 | B-V-magnitude | 1,03 |
| U-magnitude | 5,18 ±0,05 | U-B-magnitude | 0,94 |
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 | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991 | |
| 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 (J1950) | RA: 23h 37min 16,533sec | DEC: +77° 21' 11,73'' | ±0,003 arcsec |
| position (J2000) | RA: 23h 39min 20,864sec | DEC: +77° 37' 56,56'' | |
| proper motion J1950 (FK4) | RA: -0,0198 arcsec/a | DEC: 0,156 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0205 arcsec/a | DEC: 0,149 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 893 |
| Durchmusterung | BD+76 928 |
| Boss General Catalogue | 32875 |
| Henry Draper Catalogue | 222404 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 23h 37min 16,5sec | DEC: +77° 21' 12'' |
variability informations:
| magnitute at max. brightness | 3,18 |
| magnitute at min. brightness | 3,24 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K1 |
references
| to a study | 0225D (designation: 722) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |