catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

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

catalogues and names

catalogues and names	Denebola, b Leo, bet Leo, 94 Leo, HR 4534, HD 102647, SAO 99809, BD +15 2383, FK5: 444, WDS 11492+1434A
other names	Deneb Aleet
constellation	Leo

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

note (category: star names):

DENEBOLA; Deneb Aleet.

position, motion, parallax:

position (J2000)	RA: 11h 49min 3.6sec	DEC: +14° 34' 19''
position (2000.73)	RA: 11h 49min 6sec	DEC: +14° 34' 4''
position (B1900)	RA: 11h 43min 57.5sec	DEC: +15° 7' 52''
proper motion (J2000)	RA: -0.497 arcsec/a	DEC: -0.114 arcsec/a
radial velocity	0 km/s note: variable radial velocity
rotational velocity	121 km/s (uncertain) (variable)
trigonometric parallax	0.082 arcsec
galactic coordinates	longitude: 250.65°	latitude: 70.81°

magnitude

visual magnitude

2.14 (V on UBV Johnson system)

spectral / color information

spectral class	A3V
B-V-magnitude	0.09
U-B-magnitude	0.07
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

Bet Leo

note (category: variability):

Delta Sct?, 2.09 - 2.16V.

double/multiple star system information

number of components of multiple star system	4
separation	264 arcsec
mag difference (of double or brightest multiple)	6.5
component ID	AD

note (category: double and multiple data):

B, 15.7v at 40" physical; C, 13v at 80" optical.

miscellaneous information

note (category: stellar radii or diameters):

Diam. = 0.00125 - 0.00133".

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

position, motion, parallax:

position (J2000)	RA: 11h 49min 3.58sec	DEC: +14° 34' 19.35''	±0.06 arcsec	source: 15
position (2000.73)	RA: 11h 49min 6sec	DEC: +14° 34' 4''	JD: 2451810.88
proper motion (J2000)	RA: -0.0342 arcsec/a	DEC: -0.114 arcsec/a		source: 25
radial velocity	0 km/s			source: 25
trigonometric parallax	0.082 arcsec		±0.008 arcsec	source: 25
galactic coord. (B1950)	longitude: 250.68°	latitude: 70.81°

magnitude:

visual	2.14 (observed)	source: 25
photovisual	2.2	source: 2

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A3V		source: 25
B-magnitude	2.23 ±0.05	B-V-magnitude	0.09
U-magnitude	2.3 ±0.05	U-B-magnitude	0.07

variability information:

source of data: 27

variability type	150
var. amplitude	0

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	39.7 arcsec
magnitude difference between brightest and second brightest component	13.6
position angle	346 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	2.14	A2	Denebola, b Leonis, 94 Leo, HR 4534, HD 102647, SAO 99809
B	8.44	F8

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
27	Catalog of Red Magnitudes (CRM)
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: 11h 46min 30.605sec	DEC: +14° 51' 5.8''	±0.003 arcsec
position (2000.73)	RA: 11h 49min 8sec	DEC: +14° 34' 11''	JD: 2451810.88
position (J2000)	RA: 11h 49min 3.582sec	DEC: +14° 34' 19.4''
proper motion B1950 (FK4)	RA: -0.0343 arcsec/a	DEC: -0.119 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0342 arcsec/a	DEC: -0.114 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	2.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 444
Durchmusterung	BD+15 2383
Boss General Catalogue	16189
Henry Draper Catalogue	102647

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

position:

position (equinox 1950.0)

RA: 11h 46min 30.6sec

DEC: +14° 51' 6''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	2.14
magnitute amplitude	0.025
photometric system	visual, photovisual or Johnson's V

references

to a study	C.Bartolini, A.Dapergolas, A.Piccioni, IBVS No.2010,1981.
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	46/9002
constellation	Leo
notes on existence	The star is equivalent to '67285'.

variability type description

variability type

description

DSCTC

Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.