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	d Cep, del Cep, 27 Cep, HR 8571, HD 213306, SAO 34508, BD +57 2548, FK5: 847, WDS 22292+5825A
constellation	Cepheus

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

position, motion, parallax:

position (J2000)	RA: 22h 29min 10.3sec	DEC: +58° 24' 55''
position (2000.72)	RA: 22h 29min 12sec	DEC: +58° 25' 8''
position (B1900)	RA: 22h 25min 27.3sec	DEC: +57° 54' 12''
proper motion (J2000)	RA: 0.015 arcsec/a	DEC: 0.001 arcsec/a
radial velocity	-15 km/s note: spectroscopic binaries
rotational velocity	9 km/s (uncertain) (variable)
trigonometric parallax	0.011 arcsec
galactic coordinates	longitude: 105.19°	latitude: 0.53°

magnitude

visual magnitude

3.75 (V on UBV Johnson system)

spectral / color information

spectral class	F5Ib-G2Ib
B-V-magnitude	0.6
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

Del Cep

note (category: variability):

ADS 15987A, CDelta 3.48 - 4.34V, 5.366341d. Period varies. Prototype star Delta Cep, discovered by Goodricke in 1784. Blue companion ADS 15987C is also var. and SB.

double/multiple star system information

number of components of multiple star system	3
separation	40.8 arcsec
mag difference (of double or brightest multiple)	2.4
component ID	AC

note (category: double and multiple data):

B, 13v at 21" optical. AC CPM, C at 41", 6.30V, -0.03(B-V), -0.35(U-B), B7IV, RV -21k/s, vsini 135k/s.

note (category: spectroscopic binaries):

ADS 15987C, blue star whose secondary may have low mass about 0.1 solar. 0.89986 or 0.46458d, K 8.6 or 8.8k/s, V0 -16.4k/s.

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

position, motion, parallax:

position (J2000)	RA: 22h 29min 10.266sec	DEC: +58° 24' 54.62''	±0.06 arcsec	source: 15
position (2000.72)	RA: 22h 29min 12sec	DEC: +58° 25' 8''	JD: 2451806.24
proper motion (J2000)	RA: 0.0019 arcsec/a	DEC: 0.001 arcsec/a		source: 25
radial velocity	-15 km/s			source: 25
trigonometric parallax	0.011 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 105.2°	latitude: 0.53°

magnitude:

visual

3.5 (observed)

source: 31

spectral information:

spectral class	G0		source: 96
Morgan-Keenan	F5Ib-G2Ib		source: 25
B-magnitude	4.35 ±0.05	B-V-magnitude	0.6
U-magnitude	4.4 ±0.02	U-B-magnitude	0.36

variability information:

source of data: 30

variability type	111
var. amplitude	0.89
var. period	5.37
var. epoch	2436075 24. August 1957, 12:00:00 UT
next max light	2451809.1 21. September 2000, 14:24:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	21 arcsec
position angle	284 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	3.5	G0	d Cephei, 27 Cep, HR 8571, HD 213306, SAO 34508
B	6.3	A0

sources:

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 (B1950)	RA: 22h 27min 18.529sec	DEC: +58° 9' 31.76''	±0.004 arcsec
position (2000.72)	RA: 22h 29min 12sec	DEC: +58° 25' 8''	JD: 2451806.24
position (J2000)	RA: 22h 29min 10.255sec	DEC: +58° 24' 54.52''
proper motion B1950 (FK4)	RA: 0.0015 arcsec/a	DEC: 0.005 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0018 arcsec/a	DEC: 0 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4 (accuracy: 2 decimals)
source of visual magnitude data	Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class	+++
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: 847
Durchmusterung	BD+57 2548
Boss General Catalogue	31421
Henry Draper Catalogue	213306

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

position and proper motion:

position (J2000)	RA: 22h 29.2min	DEC: +58° 25'
proper motion (J2000)	RA: 0.015 arcsec/a	DEC: 0.001 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	1878	6	286°	19.4''	-	13	F5Iab	BU 702
	1961		284°	21''
AC	1835	33	191°	40.8''	-	6.3	B7V	STF 58

discoverer information:

discoverer code	discoverer	reference
BU 702	Burnham, S.W.	-
STF 58	Struve, F.G.W.	-

notes:

note	Delta Cep. Prototype of the Cepheid variables, P = 5.36d. C is variable and a spectroscopic binary.

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

position:

position (equinox 1950.0)

RA: 22h 27min 18.5sec

DEC: +58° 9' 32''

variability informations:

variability type	DCEP	pulsating variable star
magnitute at max. brightness	3.48
magnitute at min. brightness	4.37
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2436075.445 24. August 1957, 22:40:48 UT
period [d]	5.366341
next maximum light [JD]	2451809.556812 22. September 2000, 01:21:49 UT
rising time	25 % of period

spectral information

spectral class

F5Ib-G1Ib

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	20/9004
constellation	Cepheus
notes on existence	The star is equivalent to '0209005 eps'.
There are notes in published catalog.

variability type description

variability type

description

DCEP

These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods.