s Cassiopeiae
| catalogues and names | s Cas, 8 Cas, HR 9071, HD 224572, SAO 35947, WDS 23590+5545A |
| constellation | Cassiopeia |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 23h 59min 0,5sec | DEC: +55° 45' 18'' |
| position (J1900) | RA: 23h 53min 56sec | DEC: +55° 11' 54'' |
| proper motion (J2000) | RA: 0,009 arcsec/a | DEC: -0,004 arcsec/a |
| radial velocity | -13 km/s note: spectroscopic binaries, double lined spectra |
|
| rotational velocity | 189 km/s (uncertain) (variable) | |
| dynamical parallax | 0,006 arcsec | |
magnitude
| visual magnitude | 4,88 (V on UBV Johnson system) |
spectral / color information
| spectral class | B1V |
| B-V-magnitude | -0,07 |
| U-B-magnitude | -0,82 |
| R-I-magnitude | -0,11 |
| note (category: spectra): | Combined spectrum. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 2,8 arcsec |
| mag difference (of double or brightest multiple) | 2,2 |
| component ID | AB |
| note (category: double and multiple data): | AB binary, 5.0v B2III, 7.1v B3V. |
| note (category: spectroscopic binaries): | ADS 17140B. |
miscellaneous information
| note (category: group membership): | Probable foreground star of a sparse group with HR 9045, 9052 and several fainter stars. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 23h 59min 0,596sec | DEC: +55° 45' 18,49'' | ±0,43 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0021 arcsec/a | DEC: 0,002 arcsec/a | source: 25 | |
| radial velocity | -13 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 115,56° | latitude: -6,36° | ||
| GCI unit vector (J2000) | X: 0,562726 | Y: -0,002431 | Z: 0,82664 | |
magnitude:
| visual | 4,88 (observed) | source: 25 |
| photovisual | 4,9 | source: 2 |
| photographic | 4,7 | source: 16 |
spectral information:
| spectral class | B2 | source: 96 | |
| Morgan-Keenan | B1V | source: 25 | |
| B-magnitude | 4,81 ±0,05 | B-V-magnitude | -0,07 |
| U-magnitude | 3,99 ±0,05 | U-B-magnitude | -0,82 |
double/multiple star system information:
| separation between brightest and second brightest component | 3,1 arcsec |
| magnitude difference between brightest and second brightest component | 2 |
| position angle | 327 ° |
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 (J1950) | RA: 23h 56min 27,677sec | DEC: +55° 28' 35,99'' | ±0,013 arcsec |
| position (J2000) | RA: 23h 59min 0,532sec | DEC: +55° 45' 17,72'' | |
| proper motion J1950 (FK4) | RA: 0,0009 arcsec/a | DEC: 0,001 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0011 arcsec/a | DEC: -0,004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B2 |
| 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: 33257 |
| Durchmusterung | BD+54 3082 |
| Boss General Catalogue | 33257 |
| Henry Draper Catalogue | 224572 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 23h 59min | DEC: +55° 45' |
| proper motion (J2000) | RA: 0,014 arcsec/a | DEC: -0,004 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 | 1830 | 67 | 324° | 3,1'' | 5 | 7 | B1V | STF3049 |
| 1983 | 327° | - | ||||||
| AC | 1879 | 2 | 67° | 109,9'' | 4,9 | - | - | STF3049 |
discoverer information:
| discoverer code | discoverer | reference |
| STF3049 | Struve, F.G.W. | - |
notes:
| note | Sigma Cas. B is a spectroscopic binary. |