u1Cassiopeiae
catalogues and names
| catalogues and names | u1Cas, 26 Cas, HR 253, HD 5234, SAO 21832, BD +58 134, WDS 00550+5858A |
| constellation | Cassiopeia |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 0h 55min 0.1sec | DEC: +58° 58' 22'' | ||
| position (B1900) | RA: 0h 49min 3.7sec | DEC: +58° 25' 53'' | ||
| proper motion (J2000) | RA: -0.032 arcsec/a | DEC: -0.043 arcsec/a | ||
| radial velocity | -23 km/s note: suspected variable radial velocity |
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| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.006 arcsec | |||
| galactic coordinates | longitude: 123.39° | latitude: -3.9° | ||
magnitude
| visual magnitude | 4.83 (V on UBV Johnson system) |
spectral / color information
| spectral class | K2III |
| B-V-magnitude | 1.21 |
| U-B-magnitude | 1.26 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 94.1 arcsec |
| mag difference (of double or brightest multiple) | 7.6 |
| component ID | AC |
| note (category: double and multiple data): | AB optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 0h 55min 0.114sec | DEC: +58° 58' 21.42'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: -0.0046 arcsec/a | DEC: -0.049 arcsec/a | source: 25 | |
| radial velocity | -23 km/s | source: 25 | ||
| trigonometric parallax | 0.006 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 123.4° | latitude: -3.9° | ||
magnitude:
| visual | 4.83 (observed) | source: 25 |
| photovisual | 5 | source: 2 |
| photographic | 5.9 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K2III | source: 25 | |
| B-magnitude | 6.04 ±0.05 | B-V-magnitude | 1.21 |
| U-magnitude | 7.3 ±0.05 | U-B-magnitude | 1.26 |
double/multiple star system information:
| separation between brightest and second brightest component | 14.3 arcsec |
| magnitude difference between brightest and second brightest component | 7.5 |
| position angle | 70 ° |
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 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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: 0h 52min 1.012sec | DEC: +58° 42' 9.03'' | ±0.019 arcsec |
| position (J2000) | RA: 0h 55min 0.125sec | DEC: +58° 58' 21.62'' | |
| proper motion B1950 (FK4) | RA: -0.0042 arcsec/a | DEC: -0.038 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0042 arcsec/a | DEC: -0.043 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K0 |
| 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: 1086 |
| Durchmusterung | BD+58 134 |
| Boss General Catalogue | 1086 |
| Henry Draper Catalogue | 5234 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 0h 55min | DEC: +58° 58' |
| proper motion (J2000) | RA: -0.03 arcsec/a | DEC: -0.041 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 | 1889 | 4 | 75° | 12.8'' | 5 | 12.5 | K2III | BU 1098 |
| 1934 | 70° | 14.3'' | ||||||
| AC | 1912 | 2 | 128° | 93.6'' | 5 | 11.8 | - | BU 1098 |
| 1959 | 127° | 94.1'' |
discoverer information:
| discoverer code | discoverer | reference |
| BU 1098 | Burnham, S.W. | - |
notes:
| note | Upsilon (1) Cas. |