r Capricorni
catalogues and names
| catalogues and names | r Cap, 11 Cap, HR 7822, HD 194943, SAO 163614, BD -18 5689, WDS 20272+3949 |
| constellation | Capricornus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 28min 51.6sec | DEC: -17° 48' 49'' | ||
| position (B1900) | RA: 20h 23min 9.4sec | DEC: -18° 8' 39'' | ||
| proper motion (J2000) | RA: -0.014 arcsec/a | DEC: -0.021 arcsec/a | ||
| radial velocity | 18 km/s note: variable radial velocity |
|||
| rotational velocity | 91 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.047 arcsec | |||
| galactic coordinates | longitude: 26.8° | latitude: -29.27° | ||
| note (category: dynamical parallaxes): | 0.017". |
magnitude
| visual magnitude | 4.78 (V on UBV Johnson system) |
spectral / color information
| spectral class | F2IV |
| B-V-magnitude | 0.38 |
| U-B-magnitude | 0.04 |
| R-I-magnitude |
double/multiple star system information
| number of components of multiple star system | 5 |
| separation | 249.5 arcsec |
| mag difference (of double or brightest multiple) | 1.7 |
| component ID | AD |
| note (category: double and multiple data): | AB binary. B, 8.0v at 0.8". |
miscellaneous information
| note (category: group membership): | Sirius group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 28min 51.616sec | DEC: -17° 48' 50.55'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.001 arcsec/a | DEC: -0.039 arcsec/a | source: 25 | |
| radial velocity | 18 km/s | source: 25 | ||
| trigonometric parallax | 0.047 arcsec | ±0.005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 26.8° | latitude: -29.27° | ||
magnitude:
| visual | 4.78 (observed) | source: 25 |
| photovisual | 4.3 | source: 16 |
| photographic | 5.2 | source: 2 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | F2IV | source: 25 | |
| B-magnitude | 5.16 ±0.05 | B-V-magnitude | 0.38 |
| U-magnitude | 5.2 ±0.05 | U-B-magnitude | 0.04 |
double/multiple star system information:
| separation between brightest and second brightest component | 1 arcsec |
| magnitude difference between brightest and second brightest component | 2 |
| position angle | 199 ° |
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 | |
| 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 (B1950) | RA: 20h 26min 0.601sec | DEC: -17° 58' 49.23'' | ±0.009 arcsec |
| position (J2000) | RA: 20h 28min 51.602sec | DEC: -17° 48' 49.04'' | |
| proper motion B1950 (FK4) | RA: -0.0011 arcsec/a | DEC: -0.02 arcsec/a | ±0.001 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.001 arcsec/a | DEC: -0.021 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 766 |
| Durchmusterung | BD-18 5689 |
| Boss General Catalogue | 28481 |
| Henry Draper Catalogue | 194943 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 27.2min | DEC: +39° 49' |
| proper motion (J2000) | RA: 0 arcsec/a | DEC: 0 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 |
| - | 1922 | 3 | 80° | 3.2'' | 12.2 | 12.3 | - | ES 1976 |
| - | 1896 | 1 | 116° | 24.4'' | 11 | 11 | - | SEI1127 |
discoverer information:
| discoverer code | discoverer | reference |
| ES 1976 | Espin, T.E. | - |
| SEI1127 | Scheiner, J. | - |