catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

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

catalogues and names

catalogues and names

SU Cyg, HR 7518, HD 186688, SAO 87659, BD +28 3460

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

position, motion, parallax:

position (J2000)	RA: 19h 44min 48.7sec	DEC: +29° 15' 53''
position (2000.72)	RA: 19h 44min 51sec	DEC: +29° 15' 59''
position (B1900)	RA: 19h 40min 48.4sec	DEC: +29° 1' 23''
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: -0.002 arcsec/a
radial velocity	-36 km/s note: variable radial velocity
trigonometric parallax	-0.01 arcsec
galactic coordinates	longitude: 64.76°	latitude: 2.51°

magnitude

visual magnitude

6.82 (V on UBV Johnson system)

spectral / color information

spectral class	F2I
B-V-magnitude	0.64
U-B-magnitude	0.2
R-I-magnitude

note (category: spectra):

Also classified F0-G1II, G0III and F2-G0II-III + B7V.

variability information

variable star identification

SU Cyg

note (category: variability):

CDelta 6.44 - 7.22V, 3.8455473d. Period changes.

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

position, motion, parallax:

position (J2000)	RA: 19h 44min 48.758sec	DEC: +29° 15' 53.18''	±0.43 arcsec	source: 16
position (2000.72)	RA: 19h 44min 51sec	DEC: +29° 15' 59''	JD: 2451806.24
proper motion (J2000)	RA: 0.0006 arcsec/a	DEC: 0.003 arcsec/a		source: 25
radial velocity	-36 km/s			source: 25
galactic coord. (B1950)	longitude: 64.76°	latitude: 2.51°

magnitude:

visual	6.4 (observed)	source: 31
photographic	7.2	source: 16

spectral information:

spectral class	F2		source: 96
Morgan-Keenan	F2I		source: 25
B-magnitude	7.46 ±0.05	B-V-magnitude	0.64
U-magnitude	7.66 ±0.05	U-B-magnitude	0.2

variability information:

source of data: 30

variability type	111
var. amplitude	0.78
var. period	3.85
var. epoch	2443302 7. June 1977, 12:00:00 UT
next max light	2451806.65 19. September 2000, 03:36:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0 arcsec
position angle	167 °

sources:

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
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: 19h 42min 48.509sec	DEC: +29° 8' 34.11''	±0.071 arcsec
position (2000.72)	RA: 19h 44min 51sec	DEC: +29° 15' 59''	JD: 2451806.24
position (J2000)	RA: 19h 44min 48.716sec	DEC: +29° 15' 52.58''
proper motion B1950 (FK4)	RA: -0.0001 arcsec/a	DEC: 0 arcsec/a	±0.018 arcsec/a in RA ±0.013 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0001 arcsec/a	DEC: -0.002 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.4 (accuracy: 1 decimal)
source of visual magnitude data	Source cited in source catalog introduction.

spectral information:

spectral class	F2p
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	GC, catalogue number: 27336
Durchmusterung	BD+28 3460
Boss General Catalogue	27336
Henry Draper Catalogue	186688

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

position:

position (equinox 1950.0)

RA: 19h 42min 48.5sec

DEC: +29° 8' 34''

variability informations:

variability type	DCEP	pulsating variable star
magnitute at max. brightness	6.44
magnitute at min. brightness	7.22
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2443301.778 7. June 1977, 06:40:19 UT
period [d]	3.8455473
next maximum light [JD]	2451808.1286276 20. September 2000, 15:05:13 UT
rising time	37 % of period

spectral information

spectral class

F2-G0I-II+B7V

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	31/21
constellation	Cygnus
notes on existence	The star is equivalent to '0310022 SV'.
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.