a1Canum 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


catalogues and names a1Cvn, 12 Cvn, HR 4914, HD 112412, SAO 63256, WDS 12560+3819B
constellation Canes Venatici

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


position, motion, parallax:

position (J2000) RA: 12h 56min 0,4sec DEC: +38 18' 53''
position (J1900) RA: 12h 51min 19,7sec DEC: +38 51' 17''
proper motion (J2000) RA: -0,236 arcsec/a DEC: 0,062 arcsec/a
radial velocity -3 km/s
note: variable radial velocity
rotational velocity 8 km/s (uncertain) (variable)
trigonometric parallax 0,027 arcsec
note (category: dynamical parallaxes): 0.015".

magnitude

visual magnitude 5,6
(V on UBV Johnson system)

spectral / color information

spectral class F0V
B-V-magnitude 0,34
U-B-magnitude -0,03
R-I-magnitude 0,23

double/multiple star system information

separation 19,4 arcsec
mag difference (of double or brightest multiple) 2,7
note (category: double and multiple data): Binary with HR 4915.

miscellaneous information

note (category: group membership): Hyades group.

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

position, motion, parallax:

position (J2000) RA: 12h 56min 0,576sec DEC: +38 18' 51,69'' 0,2 arcsec source: 52
proper motion (J2000) RA: -0,0183 arcsec/a DEC: 0,044 arcsec/a source: 25
radial velocity -3 km/s source: 25
trigonometric parallax 0,027 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 118,27 latitude: 78,77
GCI unit vector (J2000) X: -0,761306 Y: -0,189849 Z: 0,619976

magnitude:

visual 5,6 (observed) source: 25
photovisual 5,4 source: 2
photographic 5,7 source: 16

spectral information:

spectral class A0p source: 29
Morgan-Keenan F0V source: 25
B-magnitude 5,94 0,05 B-V-magnitude 0,34
U-magnitude 5,91 0,05 U-B-magnitude -0,03

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 19,3 arcsec
magnitude difference between brightest and second brightest component 2,71
position angle 228

component magnitude spectral class catalogue(s)/name(s)
A 2,8 A0 Cor Caroli, a2Canum Venaticorum, 12 Cvn, HR 4915, HD 112413, SAO 63257
B 5,6 A0p a1Canum Venaticorum, 12 Cvn, HR 4914, HD 112412, SAO 63256

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
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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
29 SAOJ2000
SAO on FK5 at J2000, 1989
52 PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 12h 53min 40,203sec DEC: +38 35' 3,82'' 0,022 arcsec
position (J2000) RA: 12h 56min 0,391sec DEC: +38 18' 53,45''
proper motion J1950 (FK4) RA: -0,0203 arcsec/a DEC: 0,057 arcsec/a 0,003 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,02 arcsec/a DEC: 0,062 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5,4 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class A0p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 17556
Durchmusterung BD+39 2580B
Boss General Catalogue 17556
Henry Draper Catalogue 112412

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

position and proper motion:

position (J2000) RA: 12h 56min DEC: +38 19'
proper motion (J2000) RA: -0,234 arcsec/a DEC: 0,057 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
- 1822 71 228 20'' 2,9 5,61 A0pSiEuHg STF1692
1984 - 19,3''

discoverer information:

discoverer code discoverer reference
STF1692 Struve, F.G.W. -

notes:

note Alpha CVn. Both components are spectroscopic binaries. Prototype of the Alpha CVn-type variables. Proper motion of B -226 +060, spectrum F0V.