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 (2000.72) | RA: 2h 29min 8sec | DEC: +67° 24' 21'' | ||
| 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 |
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| 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 |
| position (2000.72) | RA: 2h 29min 8sec | DEC: +67° 24' 21'' | JD: 2451809.25 | |
| 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 | 2451810.06 22. September 2000, 13:26:24 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 (2000.72) | RA: 2h 29min 8sec | DEC: +67° 24' 19'' | JD: 2451809.25 |
| 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. |