b Canum Venaticorum


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

  5. Combined General Catalogue of Variable Stars (suspected variables)


catalogues and names b Cvn, NSV 05725, 8 Cvn, HR 4785, HD 109358, SAO 44230, FK5: 470, WDS 12337+4121A
constellation Canes Venatici

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): Chara is the name assigned either to this star or, more generally, to the "southern hound" of the constellation Canes Venatici; the northern "hound" is called Asterion, a name not generally assigned any particular star.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 12h 33min 44,5sec DEC: +41 21' 27''
position (J1900) RA: 12h 28min 59,6sec DEC: +41 54' 3''
proper motion (J2000) RA: -0,705 arcsec/a DEC: 0,292 arcsec/a
radial velocity 7 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity =<3 km/s (uncertain) (variable)
trigonometric parallax 0,117 arcsec

magnitude

visual magnitude 4,26
(V on UBV Johnson system)

spectral / color information

spectral class G0V
B-V-magnitude 0,59
U-B-magnitude 0,05
R-I-magnitude 0,31

variability information

variable star identification 5725
note (category: variability): Beta CVn amp. 0.05V.

double/multiple star system information

note (category: spectroscopic binaries): 2429.9d, K 2.6k/s, V0 +6.5k/s, asini 75.7. Orbit questioned by Morbey and Griffin (1987, ApJ, 317, 343). Resolved by speckle interferometry 1978.40, sep. 0.110"; however, unresolved on numerous other occasions, so measure must be confirmed.

miscellaneous information

note (category: miscellaneous): Probable nearby star.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 12h 33min 44,545sec DEC: +41 21' 26,89'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0626 arcsec/a DEC: 0,292 arcsec/a source: 25
radial velocity 7 km/s source: 25
trigonometric parallax 0,117 0,012 arcsec source: 25
galactic coord. (B1950) longitude: 136,08 latitude: 75,32
GCI unit vector (J2000) X: -0,742481 Y: -0,110112 Z: 0,660755

magnitude:

visual 4,26 (observed) source: 25
photovisual 4,3 source: 2

spectral information:

spectral class G0 source: 96
Morgan-Keenan G0V source: 25
B-magnitude 4,85 0,05 B-V-magnitude 0,59
U-magnitude 4,9 0,05 U-B-magnitude 0,05

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,1 arcsec
position angle 43

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: 12h 31min 22,289sec DEC: +41 37' 44,1'' 0,004 arcsec
position (J2000) RA: 12h 33min 44,543sec DEC: +41 21' 26,81''
proper motion J1950 (FK4) RA: -0,0631 arcsec/a DEC: 0,288 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0626 arcsec/a DEC: 0,292 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,3 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class G0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 470
Durchmusterung BD+42 2321
Boss General Catalogue 17127
Henry Draper Catalogue 109358

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 12h 33,7min DEC: +41 21'
proper motion (J2000) RA: -0,705 arcsec/a DEC: 0,292 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
Aa 1978 1 43 0,1'' 4,26 - G0V BNU
Aa-B 1879 1 220 76,2'' 4,3 9 G0 BU 1433

discoverer information:

discoverer code discoverer reference
BNU Bonneau et al
BU 1433 Burnham, S.W. -

notes:

note Beta CVn. A spectroscopic binary and Beta CVn-type variable now probably resolved by speckle inter- ferometry.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 12h 31min 22,3sec DEC: +41 37' 44''

variability informations:

magnitute at max. brightness 4,24
magnitute at min. brightness 4,29
photometric system visual, photovisual or Johnson's V

spectral information

spectral class G0

references

to a study 631147D (designation: 8 CVN)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).