Gacrux


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 Gacrux, g Cru, NSV 05672, HR 4763, HD 108903, SAO 240019, FK5: 468, WDS 12312-5707A
constellation Crux

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

note (category: star names): Gacrux.

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

position, motion, parallax:

position (J2000) RA: 12h 31min 9,9sec DEC: -57 6' 48''
position (J1900) RA: 12h 25min 37sec DEC: -56 33' 12''
proper motion (J2000) RA: 0,023 arcsec/a DEC: -0,262 arcsec/a
radial velocity 21 km/s

magnitude

visual magnitude 1,63
(V on UBV Johnson system)

spectral / color information

spectral class M3.5III
B-V-magnitude 1,59
U-B-magnitude 1,78
R-I-magnitude 1,41

variability information

variable star identification 5672
note (category: variability): I? Amp. 0.30p.

double/multiple star system information

number of components of multiple star system 3
separation 110,6 arcsec
mag difference (of double or brightest multiple) 5,1
component ID AB
note Worley (1978) update of the IDS

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

position, motion, parallax:

position (J2000) RA: 12h 31min 9,929sec DEC: -57 6' 47,5'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0029 arcsec/a DEC: -0,262 arcsec/a source: 25
radial velocity 21 km/s source: 25
galactic coord. (B1950) longitude: 300,17 latitude: 5,65
GCI unit vector (J2000) X: -0,537968 Y: -0,07361 Z: -0,839745

magnitude:

visual 1,63 (observed) source: 25
photovisual 1,6 source: 2
photographic 3 source: 2

spectral information:

spectral class M0 source: 96
Morgan-Keenan M3.5III source: 25
B-magnitude 3,22 0,05 B-V-magnitude 1,59
U-magnitude 5 0,05 U-B-magnitude 1,78

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 110,6 arcsec
magnitude difference between brightest and second brightest component 4,79
position angle 31

component magnitude spectral class catalogue(s)/name(s)
A 1,63 M0 Gacrux, g Crucis, HR 4763, HD 108903, SAO 240019
B 6,42 A2 g Crucis, HR 4764, HD 108925, SAO 240022

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: 12h 28min 22,727sec DEC: -56 50' 0,33'' 0,009 arcsec
position (J2000) RA: 12h 31min 9,953sec DEC: -57 6' 47,56''
proper motion J1950 (FK4) RA: 0,0035 arcsec/a DEC: -0,267 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0032 arcsec/a DEC: -0,263 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 1,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class M3
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 468
Durchmusterung CP-56 5272
Boss General Catalogue 17052
Henry Draper Catalogue 108903

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

position and proper motion:

position (J2000) RA: 12h 31,2min DEC: -57 7'
proper motion (J2000) RA: 0,023 arcsec/a DEC: -0,262 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 1826 8 42 93,1'' 1,63 6,42 M3.5III DUN 124
1919 31 110,6''
AC 1879 1 82 155,2'' 1,63 9,5 - DUN 124

discoverer information:

discoverer code discoverer reference
DUN 124 Dunlop, J. -

notes:

note Gamma Cru. A variable? B is CPD-56@5274. Proper motion of B +010 -018, spectrum A3V.

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

position:

position (J1950) RA: 12h 28min 22,7sec DEC: -56 50' 0''

variability informations:

magnitute at max. brightness 1,6
magnitute at min. brightness 1,67
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M3

references

to a study 0807D (designation: 34G CRU)

miscanellous

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