Asellus Borealis


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0


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:

source of data: 19
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.