i Cassiopeiae


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. 4th Catalog of Orbits of Visual Binaries

  6. Combined General Catalogue of Variable Stars (Vol. I-III)


catalogues and names i Cas, iot Cas, HR 707, HD 15089, SAO 12298, 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 (J1900) 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
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 0,06
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 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 132,13 latitude: 6,29
GCI unit vector (J2000) X: 0,305802 Y: 0,232676 Z: 0,923226

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:

source of data: 30
variability type 160
var. amplitude 0,08
var. period 1,74
var. epoch 2437248
9. November 1960, 12:00:00 UT
next max light 2451620,4
16. March 2000, 21:36:00 UT

double/multiple star system information:

source of data: 19
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 (J1950) 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 J1950 (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 (J1900) 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.