HR 7955

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

note (category: star names):

Labelled Upsilon Cep in Burritt's Atlas, not confirmed elsewhere. It is not the double star described by Allen as Castula, Upsilon1,2 Cep.

position, motion, parallax:

position (J2000)	RA: 20h 45min 21.1sec	DEC: +57° 34' 47''
position (B1900)	RA: 20h 42min 52.1sec	DEC: +57° 13' 15''
proper motion (J2000)	RA: -0.064 arcsec/a	DEC: -0.236 arcsec/a
radial velocity	-31 km/s note: spectroscopic binaries, double lined spectra
rotational velocity	0 km/s (uncertain) (variable)
trigonometric parallax	0.046 arcsec
galactic coordinates	longitude: 94.43°	latitude: 9.06°

magnitude

visual magnitude

4.51
(V on UBV Johnson system)

spectral / color information

double/multiple star system information

separation	66.4 arcsec
mag difference (of double or brightest multiple)	5.7
note	Worley (1978) update of the IDS

note (category: double and multiple data):

B is BD+57d2241, optical.

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

position, motion, parallax:

magnitude:

visual	4.51 (observed)	source: 25
photovisual	4.6	source: 2

spectral information:

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	66.4 arcsec
magnitude difference between brightest and second brightest component	5.8
position angle	161 °

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
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: 20h 44min 6.629sec	DEC: +57° 23' 59.12''	±0.005 arcsec
position (J2000)	RA: 20h 45min 21.12sec	DEC: +57° 34' 47.18''
proper motion B1950 (FK4)	RA: -0.0085 arcsec/a	DEC: -0.232 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0079 arcsec/a	DEC: -0.235 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 the "Henry Draper Catalogue".

spectral information:

spectral class	G0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

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

position and proper motion:

position (J2000)	RA: 20h 45.4min	DEC: +57° 35'
proper motion (J2000)	RA: -0.064 arcsec/a	DEC: -0.237 arcsec/a

double/multiple star system information:

discoverer information:

discoverer code	discoverer	reference
ENG 76	Engelmann, R.	-

notes:

note	A is a spectroscopic binary. B is BD+57@2241. Proper motion of B -004 +024.