Regulus

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 Regulus, a Leo, NSV 04750, 32 Leo, HR 3982, HD 87901, SAO 98967, FK5: 380, WDS 10084+1158A
other names Cor Leonis, Rex, Al Kalb al Asad, Kabeleced
constellation Leo

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

note (category: star names): REGULUS; Cor Leonis; Rex; Al Kalb al Asad; Kabeleced.

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

position, motion, parallax:

position (J2000) RA: 10h 8min 22,3sec DEC: +11° 58' 2''
position (J1900) RA: 10h 3min 2,8sec DEC: +12° 27' 22''
proper motion (J2000) RA: -0,248 arcsec/a DEC: 0,006 arcsec/a
radial velocity 6 km/s
note: spectroscopic binaries
rotational velocity 329 km/s (uncertain) (variable)
trigonometric parallax 0,045 arcsec

magnitude

visual magnitude 1,35
(V on UBV Johnson system)

spectral / color information

spectral class B7V
B-V-magnitude -0,11
U-B-magnitude -0,36
R-I-magnitude -0,1
note (category: spectra): C1 neutral carbon continuum shows discontinuities in UV. Excess IR emission.
note (category: colors): Color excess E(B-V) = +0.01.

variability information

variable star identification 4750

double/multiple star system information

number of components of multiple star system 4
separation 177,6 arcsec
mag difference (of double or brightest multiple) 6,8
component ID AB
note (category: double and multiple data): AB binary, B, 8.13V, +0.86(B-V), +0.51(U-B), K1V. BC, 7.6, 13.1v, 2000y, a = 4.163".

miscellaneous information

note (category: stellar radii or diameters): Diam. = 0.00132 - 0.00137".

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

position, motion, parallax:

position (J2000) RA: 10h 8min 22,315sec DEC: +11° 58' 1,89'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0169 arcsec/a DEC: 0,006 arcsec/a source: 25
radial velocity 6 km/s source: 25
trigonometric parallax 0,045 ±0,004 arcsec source: 25
galactic coord. (B1950) longitude: 226,44° latitude: 48,94°
GCI unit vector (J2000) X: -0,864502 Y: 0,457866 Z: 0,207352

magnitude:

visual 1,35 (observed) source: 25
photovisual 1,3 source: 2

spectral information:

spectral class B8 source: 96
Morgan-Keenan B7V source: 25
B-magnitude 1,24 ±0,05 B-V-magnitude -0,11
U-magnitude 0,88 ±0,05 U-B-magnitude -0,36

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 177,6 arcsec
magnitude difference between brightest and second brightest component 6,77
position angle 307 °

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
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 5min 42,647sec DEC: +12° 12' 44,54'' ±0,003 arcsec
position (J2000) RA: 10h 8min 22,317sec DEC: +11° 58' 2,02''
proper motion J1950 (FK4) RA: -0,017 arcsec/a DEC: 0,003 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0169 arcsec/a DEC: 0,008 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 1,3 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B8
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 380
Durchmusterung BD+12 2149
Boss General Catalogue 13926
Henry Draper Catalogue 87901

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

position and proper motion:

position (J2000) RA: 10h 8,4min DEC: +11° 58'
proper motion (J2000) RA: -0,248 arcsec/a DEC: 0,006 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 1836 27 307° 176,9'' 1,35 8,12 B7V STF 6
1960 - 177,6''
AD 1924 1 274° 217'' 1,3 - - HDO 127
BC 1867 13 93° 3,9'' 8,13 13,1 K2V HDO 127
1943 86° 2,5''

discoverer information:

discoverer code discoverer reference
STF 6 Struve, F.G.W. -
HDO 127 - -

notes:

note Alpha Leo.

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

position:

position (J1950) RA: 10h 5min 42,6sec DEC: +12° 12' 45''

variability informations:

magnitute at max. brightness 1,33
magnitute at min. brightness 1,4
photometric system visual, photovisual or Johnson's V

spectral information

spectral class B7

references

to a study 181167D (designation: ALPHA LEO)

miscanellous

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