Achird


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


catalogues and names Achird, h Cas, eta Cas, 24 Cas, HR 219, HD 4614, SAO 21732, WDS 00491+5749A
other names according to Becvar
constellation Cassiopeia

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): Achird, according to Becvar; Allen says "unnamed".

object is infrared source (uncertain identification)

position, motion, parallax:

position (J2000) RA: 0h 49min 6sec DEC: +57 48' 57''
position (J1900) RA: 0h 43min 3sec DEC: +57 17' 6''
proper motion (J2000) RA: 1,1 arcsec/a DEC: -0,529 arcsec/a
radial velocity 9 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity =<6 km/s (uncertain) (variable)
trigonometric parallax 0,176 arcsec
note (category: radial and/or rotational velocities): Component B, +11k/s.
note (category: dynamical parallaxes): 0.177".

magnitude

visual magnitude 3,44
(V on UBV Johnson system)

spectral / color information

spectral class F9V+dM0
B-V-magnitude 0,57
U-B-magnitude 0,01
R-I-magnitude 0,36

double/multiple star system information

number of components of multiple star system 8
separation 11,6 arcsec
mag difference (of double or brightest multiple) 4
component ID AB
note (category: double and multiple data): AB 3.45 G3V, 7.51 K4Ve, 480y, a = 11.994". Combined mag., colors. Component B, vsini =<25k/s. Companions C-H optical. A possible invisible companion with period about 40y. Component B, 7.51V, +1.39(B-V), +1.03(U-B).
note (category: spectroscopic binaries): ADS 671A, 9.209d, K 2.2k/s, V0 +9.2k/s, asini 0.254. More recent observations by Morbey and Griffin (1987) and by McMillan and Smith (1988) show constant velocity; thus, the SB nature of the system is questioned.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 0h 49min 6,521sec DEC: +57 48' 56,4'' 0,43 arcsec source: 16
proper motion (J2000) RA: 0,1421 arcsec/a DEC: -0,537 arcsec/a source: 25
radial velocity 9 km/s source: 25
trigonometric parallax 0,176 0,018 arcsec source: 25
galactic coord. (B1950) longitude: 122,61 latitude: -5,05
GCI unit vector (J2000) X: 0,520464 Y: 0,113262 Z: 0,846339

magnitude:

visual 3,44 (observed) source: 25
photovisual 3,6 source: 2
photographic 4,1 source: 16

spectral information:

spectral class F8 source: 96
Morgan-Keenan F9V+M0-V source: 25
B-magnitude 4,01 0,05 B-V-magnitude 0,57
U-magnitude 4,02 0,05 U-B-magnitude 0,01

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 12,2 arcsec
magnitude difference between brightest and second brightest component 4,07
position angle 315

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
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: 0h 46min 3,645sec DEC: +57 33' 3,15'' 0,012 arcsec
position (J2000) RA: 0h 49min 6,04sec DEC: +57 48' 57,21''
proper motion J1950 (FK4) RA: 0,1368 arcsec/a DEC: -0,521 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,1377 arcsec/a DEC: -0,529 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class F8
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: 962
Durchmusterung BD+57 150
Boss General Catalogue 962
Henry Draper Catalogue 4614

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 0h 49,1min DEC: +57 49'
proper motion (J2000) RA: 0 arcsec/a DEC: -0,572 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 1820 often 81 10,7'' 3,44 7,51 G0V dM0 STF 60
1993 315 12,2''
AC 1912 2 234 154,5'' 3,44 11,4 - STF 60
1922 238 158,9''
AD 1912 2 34 159,8'' 3,6 11,6 - STF 60
1921 30 159,6''
AE 1912 7 120 203,2'' 3,6 9 - STF 60
1931 - 190,6''
AF 1913 1 268 281,7'' 3,6 - - STF 60
AG 1913 4 243 338,5'' 3,6 8,9 - STF 60
1915 - 339,2''
BC 1913 1 118 209,1'' - - - STF 60
BH 1928 1 2 10,8'' 7,2 8,6 - STF 60

discoverer information:

discoverer code discoverer reference
STF 60 Struve, F.G.W. -

notes:

note Eta Cas. Proper motion of A +1141 -572. P = 480yr., a = 12.0", motion direct. A has been reported to be a spectroscopic binary, but this is not confirmed.