catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

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

catalogues and names

catalogues and names	e Cep, eps Cep, 23 Cep, HR 8494, HD 211336, SAO 34227, BD +56 2741, WDS 22150+5703A
constellation	Cepheus

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

position, motion, parallax:

position (J2000)	RA: 22h 15min 2sec	DEC: +57° 2' 37''
position (2000.73)	RA: 22h 15min 4sec	DEC: +57° 2' 50''
position (B1900)	RA: 22h 11min 20.9sec	DEC: +56° 32' 41''
proper motion (J2000)	RA: 0.447 arcsec/a	DEC: 0.048 arcsec/a
radial velocity	-1 km/s note: spectroscopic binaries
rotational velocity	86 km/s (uncertain) (variable)
trigonometric parallax	0.041 arcsec
galactic coordinates	longitude: 102.86°	latitude: 0.4°

magnitude

visual magnitude

4.19 (V on UBV Johnson system)

spectral / color information

spectral class	F0IV
B-V-magnitude	0.28
U-B-magnitude	0.04
R-I-magnitude

variability information

variable star identification

Eps Cep

note (category: variability):

Delta Sct 4.15 - 4.20V, 0.04242 and 0.068073d. Period and amp. vary.

double/multiple star system information

separation	127.8 arcsec
mag difference (of double or brightest multiple)	5.3
note	Worley (1978) update of the IDS

note (category: spectroscopic binaries):

RV amp. greater than expected for light variation.

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

position, motion, parallax:

position (J2000)	RA: 22h 15min 2.155sec	DEC: +57° 2' 37.06''	±0.35 arcsec	source: 17
position (2000.73)	RA: 22h 15min 4sec	DEC: +57° 2' 50''	JD: 2451810.88
proper motion (J2000)	RA: 0.0547 arcsec/a	DEC: 0.053 arcsec/a		source: 25
radial velocity	-1 km/s			source: 25
trigonometric parallax	0.041 arcsec		±0.004 arcsec	source: 25
galactic coord. (B1950)	longitude: 102.87°	latitude: 0.4°

magnitude:

visual	4.188 (observed)	source: 31
photovisual	4.2	source: 2
photographic	4.5	source: 16

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	F0IV		source: 25
B-magnitude	4.47 ±0.05	B-V-magnitude	0.28
U-magnitude	4.51 ±0.05	U-B-magnitude	0.04

variability information:

source of data: 30

variability type	10
var. amplitude	0.06
var. period	0.04

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	127 arcsec
magnitude difference between brightest and second brightest component	5.3
position angle	15 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	4.188	F0	e Cephei, 23 Cep, HR 8494, HD 211336, SAO 34227
B	9.13	A0

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
17	ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 (B1950)	RA: 22h 13min 11.199sec	DEC: +56° 47' 37.39''	±0.016 arcsec
position (2000.73)	RA: 22h 15min 1sec	DEC: +57° 2' 47''	JD: 2451810.88
position (J2000)	RA: 22h 15min 1.99sec	DEC: +57° 2' 36.71''
proper motion B1950 (FK4)	RA: 0.0541 arcsec/a	DEC: 0.051 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0548 arcsec/a	DEC: 0.048 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	F0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 31135
Durchmusterung	BD+56 2741
Boss General Catalogue	31135
Henry Draper Catalogue	211336

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

position and proper motion:

position (J2000)	RA: 22h 15min	DEC: +57° 3'
proper motion (J2000)	RA: 0.447 arcsec/a	DEC: 0.053 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	1891	5	20°	132.6''	4.19	9.5	F0IV	ENG 84
	1921		15°	127''
AC	1921	1	201°	83.8''	4.19	-	-	STG 10

discoverer information:

discoverer code	discoverer	reference
ENG 84	Engelmann, R.	-
STG 10	Struve, G.	-

notes:

note	Epsilon Cep. A is a Delta Scuti-type variable. B is BD+56@2744. Proper motion of B +006 +010.

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

position:

position (equinox 1950.0)

RA: 22h 13min 11.2sec

DEC: +56° 47' 37''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	4.15
magnitute at min. brightness	4.21
photometric system	visual, photovisual or Johnson's V
period [d]	0.041242

spectral information

spectral class

F0IV

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	20/9005
constellation	Cepheus
notes on existence	The star is equivalent to '0209012 mu'.
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.