Caph

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

catalogues and names Caph, b Cas, bet Cas, 11 Cas, HR 21, HD 432, SAO 21133, FK5: 2, WDS 00092+5909
other names Chaph, Kaff, Al Sanam al Nakah
constellation Cassiopeia

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

note (category: star names): Caph; Chaph; Kaff; Al Sanam al Nakah.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 0h 9min 10,7sec DEC: +59° 8' 59''
position (J1900) RA: 0h 3min 50,2sec DEC: +58° 35' 54''
proper motion (J2000) RA: 0,525 arcsec/a DEC: -0,181 arcsec/a
radial velocity 12 km/s
note: spectroscopic binaries
rotational velocity 70 km/s (uncertain) (variable)
trigonometric parallax 0,072 arcsec

magnitude

visual magnitude 2,27
(V on UBV Johnson system)

spectral / color information

spectral class F2III-IV
B-V-magnitude 0,34
U-B-magnitude 0,11
R-I-magnitude 0,2
note (category: colors): Color excess E(B-V) = 0.00.

variability information

variable star identification Bet Cas
note (category: variability): Delta Sct, amp. 0.03V, 0.10101d.

double/multiple star system information

separation 31,3 arcsec
mag difference (of double or brightest multiple) 11,3
note (category: spectroscopic binaries): Optical companion, 27d.

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

position, motion, parallax:

position (J2000) RA: 0h 9min 10,695sec DEC: +59° 8' 59,18'' ±0,06 arcsec source: 15
proper motion (J2000) RA: 0,0683 arcsec/a DEC: -0,181 arcsec/a source: 25
radial velocity 12 km/s source: 25
trigonometric parallax 0,072 ±0,007 arcsec source: 25
galactic coord. (B1950) longitude: 117,53° latitude: -3,27°
GCI unit vector (J2000) X: 0,512384 Y: 0,020531 Z: 0,858511

magnitude:

visual 2,2 (observed) source: 31
photovisual 2,4 source: 2

spectral information:

spectral class F5 source: 96
Morgan-Keenan F2III source: 25
B-magnitude 2,61 ±0,05 B-V-magnitude 0,34
U-magnitude 2,72 ±0,05 U-B-magnitude 0,11

variability information:

source of data: 30
variability type 10
var. amplitude 0,06
var. period 0,1
var. epoch 2438992
19. August 1965, 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 31,3 arcsec
magnitude difference between brightest and second brightest component 11,3
position angle 243 °

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
15 FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 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
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
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 6min 29,735sec DEC: +58° 52' 26,77'' ±0,004 arcsec
position (J2000) RA: 0h 9min 10,719sec DEC: +59° 8' 58,99''
proper motion J1950 (FK4) RA: 0,0679 arcsec/a DEC: -0,177 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0686 arcsec/a DEC: -0,183 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,4 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 2
Durchmusterung BD+58 3
Boss General Catalogue 147
Henry Draper Catalogue 432

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

position and proper motion:

position (J2000) RA: 0h 9,2min DEC: +59° 9'
proper motion (J2000) RA: 0,525 arcsec/a DEC: -0,181 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
- 1889 7 189° 22,6'' 2,4 13,7 F2III-IV AGC 15
1935 243° 31,3''

discoverer information:

discoverer code discoverer reference
AGC 15 - -

notes:

note Beta Cas. The primary is a Delta Scuti-type variable. Spectroscopic binary, P = 27 d.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (J1950) RA: 0h 6min 29,7sec DEC: +58° 52' 27''

variability informations:

variability type DSCTC pulsating variable star
magnitute at max. brightness 2,25
magnitute at min. brightness 2,31
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2438991,876
19. August 1965, 09:01:26 UT
period [d] 0,1043
next maximum light [JD] 2451620,4157
16. March 2000, 21:58:36 UT
rising time 40 % of period

spectral information

spectral class F2III-IV

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 18/9002
constellation Cassiopeia
notes on existence The star is equivalent to '0189003 gam'.
There are notes in published catalog.

variability type description

variability type description
DSCTC Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some
members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables.

DSCTC
Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.