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	V1119 Tau, 111 Tau, HR 1780, HD 35296, SAO 94526, BD +17 920, WDS 05244+1723A
constellation	Taurus

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

position, motion, parallax:

position (J2000)	RA: 5h 24min 25.4sec	DEC: +17° 23' 0''
position (B1900)	RA: 5h 18min 35.2sec	DEC: +17° 17' 26''
proper motion (J2000)	RA: 0.246 arcsec/a	DEC: -0.009 arcsec/a
radial velocity	37 km/s note: spectroscopic binaries
rotational velocity	16 km/s (uncertain) (variable)
trigonometric parallax	0.067 arcsec
galactic coordinates	longitude: 187.2°	latitude: -10.29°

magnitude

visual magnitude

4.99 (V on UBV Johnson system)

spectral / color information

spectral class	F8V
B-V-magnitude	0.53
U-B-magnitude	-0.07

double/multiple star system information

separation	85.7 arcsec
mag difference (of double or brightest multiple)	2.9
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Companion optical.

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

position, motion, parallax:

position (J2000)	RA: 5h 24min 25.421sec	DEC: +17° 23' 0.7''	±0.2 arcsec	source: 52
proper motion (J2000)	RA: 0.0165 arcsec/a	DEC: -0.009 arcsec/a		source: 25
radial velocity	37 km/s			source: 25
trigonometric parallax	0.067 arcsec		±0.007 arcsec	source: 25
galactic coord. (B1950)	longitude: 187.2°	latitude: -10.29°

magnitude:

visual	4.99 (observed)	source: 25
photovisual	5.1	source: 2
photographic	5.5	source: 16

spectral information:

spectral class	G0		source: 96
Morgan-Keenan	F8V		source: 25
B-magnitude	5.52 ±0.05	B-V-magnitude	0.53
U-magnitude	5.45 ±0.05	U-B-magnitude	-0.07

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	85.4 arcsec
magnitude difference between brightest and second brightest component	4
position angle	271 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	4.99	G0	111 Tau, HR 1780, HD 35296, SAO 94526
B	8.37	K0

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
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
52	PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)
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: 5h 21min 30.232sec	DEC: +17° 20' 19.58''	±0.017 arcsec
position (J2000)	RA: 5h 24min 25.446sec	DEC: +17° 23' 0.44''
proper motion B1950 (FK4)	RA: 0.0172 arcsec/a	DEC: -0.008 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0172 arcsec/a	DEC: -0.009 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

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

catalogues

source catalogue	GC, catalogue number: 6645
Durchmusterung	BD+17 920
Boss General Catalogue	6645
Henry Draper Catalogue	35296

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

position and proper motion:

position (J2000)	RA: 5h 24.4min	DEC: +17° 23'
proper motion (J2000)	RA: 0.249 arcsec/a	DEC: -0.005 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
-	1825	13	271°	61.8''	4.99	9	F8V	S 478
	1922		-	85.4''

discoverer information:

discoverer code	discoverer	reference
S 478	South, J.	-

notes:

note	111 Tau. A is a spectroscopic binary. B is BD+17@919. Proper motion of B +027 -019.

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

position:

position (equinox 1950.0)

RA: 5h 21min 30.3sec

DEC: +17° 20' 20''

variability informations:

variability type	BY	rotating variable star
magnitute at max. brightness	4.98
magnitute at min. brightness	5.02
photometric system	visual, photovisual or Johnson's V

references

to a study	K.Stepien, E.Geyer, AsAp Suppl 117, No.1, 83, 1996.
to a chart/photograph

miscanellous

ID in the GCVS catalogue	78/1119
constellation	Taurus
notes on existence	The star is equivalent to '73152'.

variability type description

variability type

description

BY

BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe spectral type showing quasiperiodic light changes with periods from a fraction of a day to 120 days and amplitudes from several hundredths to 0.5 mag in V. The light variability is caused by axial rotation of a star with a variable degree of nonuniformity of the surface brightness (spots) and chromospheric activity. Some of these stars also show flares similar to those of UV Cet stars, and in those cases they also belong to the latter type and are simultaneously considered eruptive variables.