GR Virginis

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

position, motion, parallax:

position (J2000)	RA: 14h 45min 20.271sec	DEC: -6° 44' 4.06''	ą0.18 arcsec	source: 16
position (2000.73)	RA: 14h 45min 22sec	DEC: -6° 44' 15''	JD: 2451810.12
proper motion (J2000)	RA: -0.0057 arcsec/a	DEC: 0.048 arcsec/a		source: 16
galactic coord. (B1950)	longitude: 346.24°	latitude: 46.34°

magnitude:

visual	8.15 (derived)
photovisual	8.1	source: 16
photographic	8.5	source: 2

spectral information:

spectral class

source: 96

variability information:

source of data: 30

variability type	10
var. amplitude	0.45
var. period	0.42
var. epoch	2445116 26. May 1982, 12:00:00 UT
next max light	2451810.38 22. September 2000, 21:07:12 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
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: 14h 42min 41.679sec	DEC: -6° 31' 30.12''	ą0.027 arcsec
position (2000.73)	RA: 14h 45min 23sec	DEC: -6° 44' 17''	JD: 2451810.12
position (J2000)	RA: 14h 45min 20.274sec	DEC: -6° 44' 4.08''
proper motion B1950 (FK4)	RA: -0.0057 arcsec/a	DEC: 0.044 arcsec/a	ą0.013 arcsec/a in RA ą0.013 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0055 arcsec/a	DEC: 0.048 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	7.8 (accuracy: 1 decimal)
source of visual magnitude data	Taken from AGK1.

spectral information:

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

catalogues

source catalogue	Yale Transactions 17, catalogue number: 5208
Durchmusterung	BD-06 4068
Henry Draper Catalogue	129903

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

position:

position (equinox 1950.0)

RA: 14h 42min 41.7sec

DEC: -6° 31' 30''

variability informations:

variability type	EW/KW	close binary eclipsing system
magnitute at max. brightness	7.8
magnitute at min. brightness	<0.45:
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2445116.381 26. May 1982, 21:08:38 UT
period [d]	0.419757
next maximum light [JD]	2451810.245879 22. September 2000, 17:54:04 UT

spectral information

spectral class

references

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

miscanellous

ID in the GCVS catalogue	86/200
constellation	Virgo
notes on existence	The star is equivalent to '0860201 GS'.
There are notes in published catalog.

variability type description

variability type	description
EW	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
KW	Contact systems of the W UMa type, with ellipsoidal components of F0-K spectral type. Primary components are main-sequence stars and secondaries lie below and to the left of the main sequence in the (MV,B-V) diagram.