i Cassiopeiae
catalogues and names
| catalogues and names | i Cas, iot Cas, HR 707, HD 15089, SAO 12298, BD +66 213, WDS 02291+6724A |
| constellation | Cassiopeia |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 29min 4sec | DEC: +67° 24' 9'' | ||
| position (B1900) | RA: 2h 20min 49.2sec | DEC: +66° 57' 11'' | ||
| proper motion (J2000) | RA: -0.017 arcsec/a | DEC: 0.011 arcsec/a | ||
| radial velocity | 1 km/s note: suspected variable radial velocity |
|||
| rotational velocity | 46 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.023 arcsec | |||
| galactic coordinates | longitude: 132.12° | latitude: 6.29° | ||
| note (category: dynamical parallaxes): | 0.012". |
magnitude
| visual magnitude | 4.52 (V on UBV Johnson system) |
spectral / color information
| spectral class | A5pSr |
| B-V-magnitude | 0.12 |
| U-B-magnitude | 0.06 |
| R-I-magnitude |
| note (category: spectra): | Also classified B9pCrSr; strong SrII, CrII. |
variability information
| variable star identification | Iot Cas |
| note (category: variability): | ADS 1860A, Alpha CV, 4.45 - 4.53V, 1.74050d. Also magnetic and Sp. period. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 2.3 arcsec |
| mag difference (of double or brightest multiple) | 2.2 |
| component ID | AB |
| note (category: double and multiple data): | AB 4.64 A3Vp, 6.89 F5, 840y, a = 2.27". A* 4.64 A5p, 52.4y, a = 0.113". Unresolved by speckle interferometry. ABxC 4.51 A5p, 8.40 G7V, probably physical, 6.706" periastron for parabolic orbit. vsini of C =<50k/s. |
miscellaneous information
| note (category: stellar radii or diameters): | Diam. relative to Sun = 2.9. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 29min 3.964sec | DEC: +67° 24' 8.61'' | ±0.19 arcsec | source: 33 |
| proper motion (J2000) | RA: -0.0029 arcsec/a | DEC: 0.011 arcsec/a | source: 25 | |
| radial velocity | 1 km/s | source: 25 | ||
| trigonometric parallax | 0.023 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 132.13° | latitude: 6.29° | ||
magnitude:
| visual | 4.477 (observed) | source: 31 |
| photovisual | 4.6 | source: 2 |
| photographic | 4.7 | source: 2 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | A5pSr | source: 25 | |
| B-magnitude | 4.64 ±0.05 | B-V-magnitude | 0.12 |
| U-magnitude | 4.7 ±0.05 | U-B-magnitude | 0.06 |
variability information:
| variability type | 160 |
| var. amplitude | 0.08 |
| var. period | 1.74 |
| var. epoch | 2437248 9. November 1960, 12:00:00 UT |
| next max light | 2452220.7 7. November 2001, 04:48:00 UT |
double/multiple star system information:
| separation between brightest and second brightest component | 2.6 arcsec |
| magnitude difference between brightest and second brightest component | 2.9 |
| position angle | 237 ° |
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 | |
| 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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
| 33 | Hipparcos Main Input Catalogue Version 2 |
| Turon, C., et al., The Hipparcos Input Catalogue, Version 2, CDS Bull. No. 43, p.5, 1993 | |
| 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: 2h 24min 54.856sec | DEC: +67° 10' 45.26'' | ±0.009 arcsec |
| position (J2000) | RA: 2h 29min 3.97sec | DEC: +67° 24' 8.56'' | |
| proper motion B1950 (FK4) | RA: -0.0025 arcsec/a | DEC: 0.016 arcsec/a | ±0.001 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0029 arcsec/a | DEC: 0.011 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A5p |
| 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: 2952 |
| Durchmusterung | BD+66 213 |
| Boss General Catalogue | 2952 |
| Henry Draper Catalogue | 15089 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 29.1min | DEC: +67° 24' |
| proper motion (J2000) | RA: -0.004 arcsec/a | DEC: 0.014 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 |
| Aa | 1982 | 5 | 354° | 0.5'' | 4.7 | - | A5pSr | CHR 6 |
| 1989 | 309° | 0.3'' | ||||||
| Aa-B | 1829 | often | 277° | 1.9'' | 4.7 | 7.6 | A5pSr | STF 262 |
| 1983 | 237° | 2.6'' | ||||||
| Aa-C | 1829 | often | 107° | 7.6'' | 4.6 | 8.4 | A5 | STF 262 |
| 1985 | 115° | 7.1'' | ||||||
| BC | 1900 | 10 | 102° | 9.4'' | 7.6 | 8.6 | - | STF 262 |
| CD | 1880 | 3 | 57° | 205.7'' | 8.6 | - | - | STF 262 |
| 1956 | 58° | 207.2'' |
discoverer information:
| discoverer code | discoverer | reference |
| CHR 6 | - | - |
| STF 262 | Struve, F.G.W. | - |
notes:
| note | Iota Cas. A is a variable of the Alpha CVn type, and an astrometric and spectroscopic binary. A premature orbit has been computed for AB. Motion retrograde. A was detected as an astrometric binary, with P = 52yr., now resolved by speckle. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 2h 20.8min | DEC: +66° 57' |
magnitudes, spectral classes, orbital elements:
| author: | W.D. Heintz | W.D. Heintz |
| date of observation: | 1960 | 1960 |
| magnitude of component A: | 4.64 | 4.64 |
| magnitude of component B: | 4.64 | 4.64 |
| spectral class component B: | A3Vp | A3Vp |
| spectral class component B: | A3Vp | A3Vp |
| period [y]: | 840 | 52.4 |
| semi-major axis [arcsec]: | 2.27 | 0.113 |
| inclination [deg]: | 132 | 120 |
| node [deg]: | 6.3 | 40 |
| equinox of node: | 2000 | 2000 |
| eccentricity: | 0.4 | 0.19 |
| time of periastron passage: | 1550 | 1946.7 |
| dates of ephemeris: | 1960-1988 | |
| grade: | indeterminate | |
| reference: | Veroff. Sternw. Munchen 5, 136; 1962. | Ibid. |
| notes | The primary is an unresolved binary, also an Alpha CVn type variable, P = 1.74 d, and a spectrum variable (K. Rakos, Lowell Obs. Bull. 5, 227; 1962; B. Klock, Astron. J. 70, 176; 1965). The RV variation has not been confirmed. Star C (mag. 8.4, dG4) is probably physical, but Hopmann (Mitt. Wien 10, 260; 1960) computed a hyperbolic orbit for it as there is some RV difference between C and A. |
| other name(s) | STF 262 Aa-A, Iota Cas |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 2h 24min 54.9sec | DEC: +67° 10' 45'' |
variability informations:
| variability type | ACV | rotating variable star |
| magnitute at max. brightness | 4.45 | |
| magnitute at min. brightness | 4.53 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2437248.313 9. November 1960, 19:30:43 UT |
|
| period [d] | 1.7405 | |
| next maximum light [JD] | 2452220.094 6. November 2001, 14:15:22 UT |
|
| rising time | 35 % of period |
spectral information
| spectral class | B9p(Cr-Sr) |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 18/9009 |
| constellation | Cassiopeia |
| notes on existence | The star is equivalent to '0189010 kap'. |
variability type description
| variability type | description |
| ACV | Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation. |