The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Algeiba, g1Leo, NSV 04823, 41 Leo, HR 4057, HD 89484, SAO 81298, WDS 10200+1950A
other names Algieba, Al Gieba
constellation Leo

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

note (category: star names): ALGIEBA; Algeiba; Al Gieba.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 10h 19min 58,3sec DEC: +19 50' 30''
position (J1900) RA: 10h 14min 27,6sec DEC: +20 20' 51''
proper motion (J2000) RA: 0,306 arcsec/a DEC: -0,147 arcsec/a
radial velocity -37 km/s
note: spectroscopic binaries
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,022 arcsec
note (category: dynamical parallaxes): 0.013".


visual magnitude 2,61
(V on UBV Johnson system)

spectral / color information

spectral class K1-IIIbFe-0.5
B-V-magnitude 1,15
U-B-magnitude 1
R-I-magnitude 0,62

variability information

variable star identification 4823
note (category: variability): Originally confused with eclipsing star Y Leo when var. suspect number 6777 was assigned in 1965. Now HR 4057 is again suspected of variability, 1.84 - 2.03V for combined HR 4057/8. Uncertain which component is the variable.

double/multiple star system information

number of components of multiple star system 4
separation 4,5 arcsec
mag difference (of double or brightest multiple) 1,2
component ID AB
note (category: double and multiple data): AB 2.22 K0IIIP, 3.47 G7III, 618.56y, a = 2.505". B is HR 4058. Colors for combined light. Mag. for blend, 1.90V. Component C is the flare star AD Leo (8.07-11.00B) at 5', optical.

miscellaneous information

note (category: group membership): Gamma Leo group.

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

position, motion, parallax:

position (J2000) RA: 10h 19min 58,35sec DEC: +19 50' 29,2'' 0,76 arcsec source: 18
proper motion (J2000) RA: 0,0218 arcsec/a DEC: -0,164 arcsec/a source: 25
radial velocity -37 km/s source: 25
trigonometric parallax 0,022 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 216,56 latitude: 54,65
GCI unit vector (J2000) X: -0,852458 Y: 0,397632 Z: 0,339418


visual 2,61 (observed) source: 25
photovisual 2,6 source: 2
photographic 3,6 source: 16

spectral information:

spectral class F5 source: 96
Morgan-Keenan K1-IIIbFe-0.5 source: 25
B-magnitude 3,76 0,05 B-V-magnitude 1,15
U-magnitude 4,76 0,05 U-B-magnitude 1

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 4,6 arcsec
magnitude difference between brightest and second brightest component 1,2
position angle 123

component magnitude spectral class catalogue(s)/name(s)
A 2,61 F5 Algeiba, g1Leonis, 41 Leo, HR 4057, HD 89484, SAO 81298
B 3,47 K0 g2Leonis, 41 Leo, HR 4058, HD 89485, SAO 81299


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
18 Hipparcos Input Catalog Version 2 Annex
Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 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
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 (J1950) RA: 10h 17min 13,12sec DEC: +20 5' 42,86'' 0,008 arcsec
position (J2000) RA: 10h 19min 58,346sec DEC: +19 50' 29,93''
proper motion J1950 (FK4) RA: 0,0218 arcsec/a DEC: -0,151 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0217 arcsec/a DEC: -0,147 arcsec/a
source of proper motion data Determined by source catalog


visual 2,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class K0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)


source catalogue GC, catalogue number: 14177
Durchmusterung BD+20 2467A
Boss General Catalogue 14177
Henry Draper Catalogue 89484

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

position and proper motion:

position (J2000) RA: 10h 20min DEC: +19 50'
proper motion (J2000) RA: 0,314 arcsec/a DEC: -0,159 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
AB 1828 often 102 2,5'' 2,6 3,8 K0III STF1424
1990 123 4,6''
AC 1851 9 294 210,7'' 2,6 9,6 - STF1424
1915 291 259,9''
AD 1904 1 302 333'' 2,6 10 - STF1424
BC 1913 1 291 264,4'' 3,8 9,3 G5III STF1424
CD 1852 7 320 112,5'' 9,3 10 - STF1424
1911 334 98,3''

discoverer information:

discoverer code discoverer reference
STF1424 Struve, F.G.W. -


note Gamma Leo. AB: Premature orbits have been computed. C is an optical companion, and is the flare star AD Leo. Speckle by Balega et al showed no companion 1987.3827. D is BD+20@2464.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)


position (J1950) RA: 10h 17min 13,1sec DEC: +20 5' 43''

variability informations:

magnitute at max. brightness 1,84
magnitute at min. brightness 2,03
photometric system visual, photovisual or Johnson's V

spectral information

spectral class *


to a study 592735D (designation: GAMMA LEO)


There are notes in the published catalog (Kukarkin et al.(1982)).