catalogues and names

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

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

catalogues and names

catalogues and names

V0636 Sco, HD 156979, SAO 227880, CD -45 11441

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

position, motion, parallax:

position (J2000)	RA: 17h 22min 46.543sec	DEC: -45° 36' 50.77''	±0.19 arcsec	source: 16
position (2000.72)	RA: 17h 22min 50sec	DEC: -45° 36' 53''	JD: 2451806.24
proper motion (J2000)	RA: 0.0009 arcsec/a	DEC: 0.006 arcsec/a		source: 16
radial velocity	1 km/s			source: 26
galactic coord. (B1950)	longitude: 343.52°	latitude: -5.22°

magnitude:

visual	6.4 (observed)	source: 30
photovisual	6.9	source: 2

spectral information:

spectral class	G5		source: 96
Morgan-Keenan	F7/8Ib/II		source: 26
B-magnitude	7.18 ±0.2	B-V-magnitude	0.78
U-magnitude	7.71 ±0.2	U-B-magnitude	0.53

variability information:

source of data: 30

variability type	111
var. amplitude	0.52
var. period	6.8
var. epoch	2440364 22. May 1969, 12:00:00 UT
next max light	2451808.4 20. September 2000, 21:36:00 UT

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
26	Bright Star Supplement
Hoffleit, D. and Warren, W.H. Jr., A Supplement to the Bright Star Catalogue, 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: 17h 19min 5.452sec	DEC: -45° 34' 1.06''	±0.069 arcsec
position (2000.72)	RA: 17h 22min 49sec	DEC: -45° 36' 53''	JD: 2451806.24
position (J2000)	RA: 17h 22min 46.442sec	DEC: -45° 36' 51.27''
proper motion B1950 (FK4)	RA: -0.0004 arcsec/a	DEC: -0.002 arcsec/a	±0.014 arcsec/a in RA ±0.011 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0005 arcsec/a	DEC: -0.003 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.8 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	G5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 23458
Durchmusterung	CD-4511441
Boss General Catalogue	23458
Henry Draper Catalogue	156979

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

position:

position (equinox 1950.0)

RA: 17h 19min 5.5sec

DEC: -45° 34' 1''

variability informations:

variability type	DCEP	pulsating variable star
magnitute at max. brightness	6.4
magnitute at min. brightness	6.92
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2440364.392 22. May 1969, 21:24:29 UT
period [d]	6.79671
next maximum light [JD]	2451810.05164 22. September 2000, 13:14:22 UT
rising time	34 % of period

spectral information

spectral class

F7/8Ib/II-G5

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	73/636
constellation	Scorpius
notes on existence	The star is equivalent to '0730637 V0637'.
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.