rho Cassiopeiae

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

position, motion, parallax:

position (J2000)	RA: 23h 54min 23sec	DEC: +57° 29' 58''
position (B1900)	RA: 23h 49min 23sec	DEC: +56° 56' 35''
proper motion (J2000)	RA: -0.002 arcsec/a	DEC: -0.002 arcsec/a
radial velocity	-43 km/s note: variable radial velocity
rotational velocity	29 km/s (uncertain) (variable)
trigonometric parallax	0.023 arcsec
galactic coordinates	longitude: 115.3°	latitude: -4.52°

note (category: radial and/or rotational velocities):

Envelope has expansion velocity about 40k/s.

magnitude

visual magnitude

4.54
(V on UBV Johnson system)

spectral / color information

spectral class	G20e
B-V-magnitude	1.22
U-B-magnitude	1.12
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Also classified F8Ia-K0pIa-0.

variability information

variable star identification

Rho Cas

note (category: variability):

SRd 4.1 - 6.2v, periods about 110 and 1100d (1946 minimum lasted 320d). Rapid spectral variation from cF5 to M5p. Photoelectric observations since June 1986 indicate an amp. of only about 0.8V and 0.3(B-V).

double/multiple star system information

note (category: double and multiple data):

Possibly wide CPM pair with HR 9052.

miscellaneous information

note (category: group membership):

Cas OB5, within 51' of center of cluster NGC 7789, nonmember.

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

position, motion, parallax:

position (J2000)	RA: 23h 54min 23.042sec	DEC: +57° 29' 57.88''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0003 arcsec/a	DEC: -0.002 arcsec/a		source: 25
radial velocity	-43 km/s			source: 25
trigonometric parallax	0.023 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 115.31°	latitude: -4.52°

magnitude:

visual	4.54 (observed)	source: 25
photovisual	4.9	source: 2

spectral information:

spectral class	F8		source: 96
Morgan-Keenan	G20		source: 25
B-magnitude	5.76 ±0.05	B-V-magnitude	1.22
U-magnitude	6.88 ±0.05	U-B-magnitude	1.12

variability information:

source of data: 30

variability type	193
var. amplitude	2.1
var. period	320

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
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
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: 23h 51min 52.422sec	DEC: +57° 13' 16.52''	±0.004 arcsec
position (J2000)	RA: 23h 54min 23.05sec	DEC: +57° 29' 58.03''
proper motion B1950 (FK4)	RA: -0.0004 arcsec/a	DEC: 0.005 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0002 arcsec/a	DEC: 0 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.8 (accuracy: 2 decimals)
source of visual magnitude data	Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class	F8p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	FK4, catalogue number: 899
Durchmusterung	BD+56 3111
Boss General Catalogue	33160
Henry Draper Catalogue	224014

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

position:

position (equinox 1950.0)

RA: 23h 51min 52.4sec

DEC: +57° 13' 17''

variability informations:

variability type	SRD	pulsating variable star
magnitute at max. brightness	4.1
magnitute at min. brightness	6.2
photometric system	visual, photovisual or Johnson's V
period [d]	320

spectral information

spectral class

F8pIa-K0pIa-0

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	18/9017
constellation	Cassiopeia
notes on existence	The star is equivalent to '0189202 B'.
There are notes in published catalog.

variability type description

variability type

description

SRD

Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V).

SRA
Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes;

SRB
Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed;

SRC
Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days;

SRD
Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa).

catalogues and names	r Cas, rho Cas, 7 Cas, HR 9045, HD 224014, SAO 35879, BD +56 3111, FK5: 899
constellation	Cassiopeia