a1Canum Venaticorum
| 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:
| 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. |