Pollux
| catalogues and names | Pollux, b Gem, NSV 03712, 78 Gem, HR 2990, HD 62509, SAO 79666, FK5: 295, WDS 07453+2802A |
| other names | Hercules |
| constellation | Gemini |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | POLLUX; Hercules. |
position, motion, parallax:
| position (J2000) | RA: 7h 45min 18,9sec | DEC: +28° 1' 34'' |
| position (J1900) | RA: 7h 39min 11,8sec | DEC: +28° 16' 4'' |
| proper motion (J2000) | RA: -0,628 arcsec/a | DEC: -0,046 arcsec/a |
| radial velocity | 3 km/s note: variable radial velocity |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,094 arcsec | |
magnitude
| visual magnitude | 1,14 (V on UBV Johnson system) |
spectral / color information
| spectral class | K0IIIb |
| B-V-magnitude | 1 |
| U-B-magnitude | 0,85 |
| R-I-magnitude | 0,5 |
| note (category: spectra): | Emission line discovered by COPERNICUS at 1218.4 may be OV probably formed in a corona. Balloon-borne spectrometer revealed pronounced emission of MgII. |
variability information
| variable star identification | 3712 |
| note (category: variability): | NSV 3712 is component A, 1.10 - 1.17V, while component E is NSV 3716, 10.5v. |
double/multiple star system information
| number of components of multiple star system | 7 |
| separation | 201,1 arcsec |
| mag difference (of double or brightest multiple) | 10,2 |
| component ID | AC |
| note (category: double and multiple data): | All the visual companions optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 7h 45min 18,946sec | DEC: +28° 1' 34,26'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0474 arcsec/a | DEC: -0,046 arcsec/a | source: 25 | |
| radial velocity | 3 km/s | source: 25 | ||
| trigonometric parallax | 0,094 | ±0,009 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 192,24° | latitude: 23,41° | ||
| GCI unit vector (J2000) | X: -0,391513 | Y: 0,79116 | Z: 0,469875 | |
magnitude:
| visual | 1,14 (observed) | source: 25 |
| photovisual | 1,2 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K0IIIb | source: 25 | |
| B-magnitude | 2,14 ±0,05 | B-V-magnitude | 1 |
| U-magnitude | 2,99 ±0,05 | U-B-magnitude | 0,85 |
double/multiple star system information:
| separation between brightest and second brightest component | 29,6 arcsec |
| magnitude difference between brightest and second brightest component | 12,6 |
| position angle | 280 ° |
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 | |
| 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 (J1950) | RA: 7h 42min 15,517sec | DEC: +28° 8' 55,11'' | ±0,003 arcsec |
| position (J2000) | RA: 7h 45min 18,943sec | DEC: +28° 1' 34,28'' | |
| proper motion J1950 (FK4) | RA: -0,0474 arcsec/a | DEC: -0,051 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0474 arcsec/a | DEC: -0,046 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 1,2 (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: 295 |
| Durchmusterung | BD+28 1463 |
| Boss General Catalogue | 10438 |
| Henry Draper Catalogue | 62509 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 7h 45,3min | DEC: +28° 2' |
| proper motion (J2000) | RA: -0,628 arcsec/a | DEC: -0,046 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 | 1880 | 6 | 275° | 41,4'' | 1,14 | 13,7 | K0IIIb | BU 580 |
| 1900 | 280° | 29,6'' | ||||||
| AC | 1781 | 8 | 66° | 116,7'' | 1,2 | 8,9 | - | H 42 |
| 1922 | 73° | 201,1'' | ||||||
| AE | 1879 | 7 | 90° | 206,3'' | 1,2 | 9,7 | - | BU 580 |
| 1924 | - | 234'' | ||||||
| AF | 1836 | 14 | 74° | 203,8'' | 1,2 | 10,4 | - | STF 5 |
| 1924 | 77° | 258,2'' | ||||||
| AG | 1904 | 2 | 328° | 170,1'' | 1,2 | - | - | BU 580 |
| 1924 | 332° | 164,5'' | ||||||
| CD | 1878 | 7 | 128° | 1,4'' | 8,9 | 11,7 | - | BU 580 |
| 1922 | 135° | - | ||||||
| CE | 1898 | 3 | 146° | 71,1'' | 8,9 | 9,7 | - | BU 580 |
| CF | 1851 | 7 | 90° | 57,8'' | 8,9 | 10,4 | - | BU 580 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 580 | Burnham, S.W. | - |
| H 42 | Herschel, W. | - |
| STF 5 | Struve, F.G.W. | - |
notes:
| note | Beta Gem. Pollux. AC: H VI 42. F is BD+28@1465. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 7h 42min 15,5sec | DEC: +28° 8' 55'' |
variability informations:
| magnitute at max. brightness | 1,1 |
| magnitute at min. brightness | 1,17 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K0 |
references
| to a study | 280421D (designation: BETA GEM) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |