Asellus Borealis
catalogues and names | Asellus Borealis, g Cnc, 43 Cnc, HR 3449, HD 74198, SAO 80378, FK5: 1228, WDS 08433+2128A |
constellation | Cancer |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
note (category: star names): | Asellus Borealis. |
position, motion, parallax:
position (J2000) | RA: 8h 43min 17,1sec | DEC: +21° 28' 7'' |
position (J1900) | RA: 8h 37min 29,9sec | DEC: +21° 49' 42'' |
proper motion (J2000) | RA: -0,106 arcsec/a | DEC: -0,039 arcsec/a |
radial velocity | 29 km/s note: spectroscopic binaries |
|
rotational velocity | 79 km/s (uncertain) (variable) | |
trigonometric parallax | 0,016 arcsec |
magnitude
visual magnitude | 4,66 (V on UBV Johnson system) |
spectral / color information
spectral class | A1IV |
B-V-magnitude | 0,02 |
U-B-magnitude | 0,01 |
R-I-magnitude | 0 |
double/multiple star system information
number of components of multiple star system | 5 |
separation | 106,3 arcsec |
mag difference (of double or brightest multiple) | 4 |
component ID | AB |
note | Worley (1978) update of the IDS |
note (category: double and multiple data): | Component A suspected occultation double. Three visual companions. |
miscellaneous information
note (category: group membership): | Hyades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 8h 43min 17,143sec | DEC: +21° 28' 6,52'' | ±0,06 arcsec | source: 15 |
proper motion (J2000) | RA: -0,0076 arcsec/a | DEC: -0,039 arcsec/a | source: 25 | |
radial velocity | 29 km/s | source: 25 | ||
trigonometric parallax | 0,016 | ±0,002 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 204,17° | latitude: 33,73° | ||
GCI unit vector (J2000) | X: -0,608349 | Y: 0,704247 | Z: 0,365989 |
magnitude:
visual | 4,66 (observed) | source: 25 |
photovisual | 4,7 | source: 2 |
spectral information:
spectral class | A0 | source: 96 | |
Morgan-Keenan | A1IV | source: 25 | |
B-magnitude | 4,68 ±0,05 | B-V-magnitude | 0,02 |
U-magnitude | 4,69 ±0,05 | U-B-magnitude | 0,01 |
double/multiple star system information:
separation between brightest and second brightest component | 111,7 arcsec |
magnitude difference between brightest and second brightest component | 4 |
position angle | 67 ° |
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: 8h 40min 23,702sec | DEC: +21° 38' 58,82'' | ±0,004 arcsec |
position (J2000) | RA: 8h 43min 17,152sec | DEC: +21° 28' 6,57'' | |
proper motion J1950 (FK4) | RA: -0,0074 arcsec/a | DEC: -0,043 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0,0075 arcsec/a | DEC: -0,039 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4,7 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
spectral class | A0 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 1228 |
Durchmusterung | BD+21 1895 |
Boss General Catalogue | 11982 |
Henry Draper Catalogue | 74198 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 8h 43,3min | DEC: +21° 28' |
proper motion (J2000) | RA: -0,106 arcsec/a | DEC: -0,039 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 | 1888 | 6 | 66° | 103'' | 4,66 | 8,7 | A1IV | ENG 38 |
1984 | 67° | 111,7'' | ||||||
Aa | 1908 | 1 | 258° | 103,3'' | 4,7 | 12,4 | - | BUP 121 |
Bb | 1908 | 1 | 102° | 94,6'' | 8,7 | 12,9 | - | BUP 121 |
discoverer information:
discoverer code | discoverer | reference |
ENG 38 | Engelmann, R. | - |
BUP 121 | - | - |
notes:
note | Gamma Cnc. A is a spectroscopic binary. B is BD+21@1897. |