V0774 Herculis

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

position, motion, parallax:

position (J2000)	RA: 18h 33min 17.766sec	DEC: +22° 18' 51.27''	ą0.43 arcsec	source: 16
position (2000.73)	RA: 18h 33min 20sec	DEC: +22° 18' 53''	JD: 2451812.24
proper motion (J2000)	RA: -0.0128 arcsec/a	DEC: -0.476 arcsec/a		source: 16
radial velocity	24.4 km/s			source: 11
trigonometric parallax	0.07 arcsec		ą0.008 arcsec	source: 6
galactic coord. (B1950)	longitude: 51.22°	latitude: 13.78°

magnitude:

visual	8.9 (observed)	source: 20
photovisual	9.3	source: 2
photographic	9.8	source: 16

spectral information:

spectral class	K2		source: 96
Morgan-Keenan	K4V		source: 98
B-magnitude	10.03 ą0.01	B-V-magnitude	1.13
U-magnitude	11.09 ą0.004	U-B-magnitude	1.06

variability information:

source of data: 30

variability type	220
var. amplitude	1.45

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
6	General Catalog of Trigonometric Stellar Parallaxes
Stellar Parallaxes, New Haven: Yale University Observatory, 1952; and Supplement, 1963
11	General Catalogue of Stellar Radial Velocities
Wilson, R.E., General Catalogue of Stellar of Stellar Radial Radial Velocities, Washington, DC: Carnegie Institute of Washington, 1953
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
20	Catalogue of Homogeneous Means in the UBV System
Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 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
98	SKYMAP Master Catalog Version 3.7
Reference from Value 97 [original data sources Catalog Version 3.7 are identified in SKYMAP Version 3.7]

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 18h 31min 11.731sec	DEC: +22° 16' 54.58''	ą0.018 arcsec
position (2000.73)	RA: 18h 33min 20sec	DEC: +22° 19' 18''	JD: 2451812.24
position (J2000)	RA: 18h 33min 17.738sec	DEC: +22° 18' 51.61''
proper motion B1950 (FK4)	RA: -0.0131 arcsec/a	DEC: -0.47 arcsec/a	ą0.005 arcsec/a in RA ą0.005 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0128 arcsec/a	DEC: -0.471 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	8.6 (accuracy: 1 decimal)
source of visual magnitude data	Taken from AGK1.
photographic	9.4 (accuracy: 2 decimals)
source of photographic magnitude data	Determined by source catalog.

spectral information:

spectral class	K2
source of spectral data	Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue	Yale Transactions 25, catalogue number: 6535
Durchmusterung	BD+22 3406
Henry Draper Catalogue	171314

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

position:

position (equinox 1950.0)

RA: 18h 31min 11.7sec

DEC: +22° 16' 55''

variability informations:

variability type	UV	eruptive variable star
magnitute at max. brightness	9.45:
magnitute at min. brightness	10.9:
photometric system

spectral information

spectral class

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	40/774
constellation	Hercules
notes on existence	The star is equivalent to '0400775 V0775'.
There are notes in published catalog.

variability type description

variability type

description

Eruptive variables of the UV Ceti type, these are K Ve-M Ve stars sometimes displaying flare activity with amplitudes from several tenths of a magnitude up to 6 mag in V. The amplitude is considerably greater in the ultraviolet spectral region. Maximum light is attained in several seconds or dozens of seconds after the beginning of a flare; the star returns to its normal brightness in several minutes or dozens of minutes.