Marfak
catalogues and names
| catalogues and names | Marfak, q Cas, NSV 00423, 33 Cas, HR 343, HD 6961, SAO 22070, BD +54 236, WDS 01111+5509 |
| constellation | Cassiopeia |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Marfak. Name shared with HR 321. |
position, motion, parallax:
| position (J2000) | RA: 1h 11min 6.2sec | DEC: +55° 8' 59'' | ||
| position (B1900) | RA: 1h 5min 0.5sec | DEC: +54° 37' 5'' | ||
| proper motion (J2000) | RA: 0.229 arcsec/a | DEC: -0.022 arcsec/a | ||
| radial velocity | 9 km/s note: spectroscopic binaries |
|||
| rotational velocity | 102 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.014 arcsec | |||
| galactic coordinates | longitude: 125.76° | latitude: -7.61° | ||
magnitude
| visual magnitude | 4.33 (V on UBV Johnson system) |
spectral / color information
| spectral class | A7V |
| B-V-magnitude | 0.17 |
| U-B-magnitude | 0.12 |
| R-I-magnitude |
variability information
| variable star identification | 423 |
| note (category: variability): | Delta Sct? |
double/multiple star system information
| separation | 145.6 arcsec |
| mag difference (of double or brightest multiple) | 5.9 |
| note | Worley (1978) update of the IDS |
| note (category: spectroscopic binaries): | Unresolved by speckle interferometry. |
miscellaneous information
| note (category: group membership): | Hyades moving group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 1h 11min 6.175sec | DEC: +55° 8' 59.81'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0267 arcsec/a | DEC: -0.016 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| trigonometric parallax | 0.014 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 125.77° | latitude: -7.61° | ||
magnitude:
| visual | 4.33 (observed) | source: 25 |
| photovisual | 4.5 | source: 2 |
| photographic | 4.7 | source: 16 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | A7V | source: 25 | |
| B-magnitude | 4.5 ±0.05 | B-V-magnitude | 0.17 |
| U-magnitude | 4.62 ±0.05 | U-B-magnitude | 0.12 |
double/multiple star system information:
| separation between brightest and second brightest component | 145.6 arcsec |
| magnitude difference between brightest and second brightest component | 6.1 |
| position angle | 135 ° |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 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: 1h 8min 2.554sec | DEC: +54° 53' 4.32'' | ±0.014 arcsec |
| position (J2000) | RA: 1h 11min 6.183sec | DEC: +55° 8' 59.36'' | |
| proper motion B1950 (FK4) | RA: 0.0265 arcsec/a | DEC: -0.017 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0267 arcsec/a | DEC: -0.022 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 1424 |
| Durchmusterung | BD+54 236 |
| Boss General Catalogue | 1424 |
| Henry Draper Catalogue | 6961 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 1h 11.1min | DEC: +55° 9' |
| proper motion (J2000) | RA: 0.229 arcsec/a | DEC: -0.016 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 |
| - | 1853 | 4 | 132° | 154.6'' | 4.33 | 10.4 | A7V | STT |
| 1907 | 135° | 145.6'' |
discoverer information:
| discoverer code | discoverer | reference |
| STT | Struve, O. |
notes:
| note | Theta Cas. A is a spectroscopic binary, B is optical. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 1h 8min 2.6sec | DEC: +54° 53' 4'' |
variability informations:
| magnitute at max. brightness | 4.32 |
| magnitute at min. brightness | 4.36 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | A7 |
references
| to a study | 360359D (designation: THETA CAS) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |