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	r Leo, rho Leo, 47 Leo, HR 4133, HD 91316, SAO 118355, BD +10 2166, FK5: 396, WDS 10328+0918
constellation	Leo

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

position, motion, parallax:

position (J2000)	RA: 10h 32min 48.7sec	DEC: +9° 18' 24''
position (2000.72)	RA: 10h 32min 51sec	DEC: +9° 18' 11''
position (B1900)	RA: 10h 27min 32.7sec	DEC: +9° 49' 17''
proper motion (J2000)	RA: -0.007 arcsec/a	DEC: -0.003 arcsec/a
radial velocity	42 km/s note: spectroscopic binaries
rotational velocity	61 km/s (uncertain) (variable)
trigonometric parallax	0.011 arcsec
galactic coordinates	longitude: 234.89°	latitude: 52.77°

magnitude

visual magnitude

3.85 (V on UBV Johnson system)

spectral / color information

spectral class	B1Ib
B-V-magnitude	-0.14
U-B-magnitude	-0.96
R-I-magnitude

note (category: spectra):

Lyman beta observed from COPERNICUS. Nitrogen enhanced, and carbon deficient.

note (category: colors):

Color excess E(B-V) = +0.08.

variability information

variable star identification

Rho Leo

note (category: variability):

Alpha Cyg 3.83 - 3.90V.

double/multiple star system information

separation	0 arcsec
mag difference (of double or brightest multiple)	0.4
note	Worley (1978) update of the IDS

note (category: double and multiple data):

4.4, 4.8v, sep. 0.11"; combined mag., colors.

note (category: spectroscopic binaries):

Inferred statistically by F. Schlesinger in 1915. Unresolved by speckle interferometry 1982.17.

miscellaneous information

note (category: miscellaneous):

Old disk population runaway star.

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

position, motion, parallax:

position (J2000)	RA: 10h 32min 48.671sec	DEC: +9° 18' 23.66''	±0.06 arcsec	source: 15
position (2000.72)	RA: 10h 32min 51sec	DEC: +9° 18' 11''	JD: 2451809.24
proper motion (J2000)	RA: -0.0004 arcsec/a	DEC: -0.003 arcsec/a		source: 25
radial velocity	42 km/s			source: 25
trigonometric parallax	0.011 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 234.9°	latitude: 52.77°

magnitude:

visual	3.8 (observed)	source: 31
photovisual	3.9	source: 2

spectral information:

spectral class	B0		source: 96
Morgan-Keenan	B1Ib		source: 25
B-magnitude	3.71 ±0.05	B-V-magnitude	-0.14
U-magnitude	2.75 ±0.05	U-B-magnitude	-0.96

variability information:

source of data: 30

variability type	133
var. amplitude	0.07

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0.1 arcsec
position angle	86 °

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
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
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: 10h 30min 10.762sec	DEC: +9° 33' 52.22''	±0.004 arcsec
position (2000.72)	RA: 10h 32min 51sec	DEC: +9° 18' 10''	JD: 2451809.24
position (J2000)	RA: 10h 32min 48.666sec	DEC: +9° 18' 23.72''
proper motion B1950 (FK4)	RA: -0.0006 arcsec/a	DEC: -0.006 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0005 arcsec/a	DEC: -0.002 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B0p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 396
Durchmusterung	BD+10 2166
Boss General Catalogue	14487
Henry Draper Catalogue	91316

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

position and proper motion:

position (J2000)	RA: 10h 32.8min	DEC: +9° 18'
proper motion (J2000)	RA: -0.007 arcsec/a	DEC: -0.003 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
-	1937	2	68°	0.1''	3.8	-	B1Ib	WRH 19
	1940		86°	-

discoverer information:

discoverer code	discoverer	reference
WRH 19	Wilson, R.H.	-

notes:

note	Rho Leo. Possible spectroscopic binary.

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

position:

position (equinox 1950.0)

RA: 10h 30min 10.8sec

DEC: +9° 33' 52''

variability informations:

variability type	ACYG	pulsating variable star
magnitute at max. brightness	3.83
magnitute at min. brightness	3.9
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B1Iab

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	46/9017
constellation	Leo
notes on existence	The star is equivalent to '0470001 R'.

variability type description

variability type	description
ACYG	Variables of the Alpha Cygni type, which are nonradially pulsating supergiants of Bep-AepIa spectral types. The light changes with amplitudes of the order of 0.1 mag often seem irregular, being caused by the superposition of many oscillations with close periods. Cycles from several days to several weeks are observed.