Graffias


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 Graffias, b1Sco, NSV 07424, 8 Sco, HR 5984, HD 144217, SAO 159682, FK5: 597, WDS 16054-1948A
other names Grafias, Grassias, Acrab, Akrab, Elacrab
constellation Scorpius

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

note (category: star names): Graffias; Grafias; Grassias; Acrab; Akrab; Elacrab.

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

position, motion, parallax:

position (J2000) RA: 16h 5min 26,2sec DEC: -19 48' 20''
position (J1900) RA: 15h 59min 37,2sec DEC: -19 31' 54''
proper motion (J2000) RA: -0,006 arcsec/a DEC: -0,019 arcsec/a
radial velocity -1 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity 130 km/s (uncertain) (variable)
trigonometric parallax 0,009 arcsec
note (category: dynamical parallaxes): 0.004".

magnitude

visual magnitude 2,62
(V on UBV Johnson system)

spectral / color information

spectral class B1V
B-V-magnitude -0,07
U-B-magnitude -0,87
R-I-magnitude -0,09
note (category: spectra): Ca and Na lines nearly stationary.

variability information

variable star identification 7424

double/multiple star system information

number of components of multiple star system 5
separation 0 arcsec
mag difference (of double or brightest multiple) 1,3
component ID O
note (category: double and multiple data): CPM with HR 5985 = ADS 9913C, at 14" and with B, 5.9v at 0.5", possibly SB. Lunar occultations and speckle interferometry indicate companions 4.2v at 0.001" from A and 7.6v at 0.129" from C. Occultations by Jupiter and Io in 1971 indicate complex system. Component C occulted by Io revealed the 2.5 mag. fainter companion at 0.1".
note (category: spectroscopic binaries): ADS 9913AD, 6.8281d, K 129.0k/s, V0 -1.0k/s, msin3i 16.0, asini 11.6. Mag. difference about 1v. Apsidal period 51000 times orbital. Unresolved by speckle interferometry. Possible third SB component.

miscellaneous information

note (category: group membership): Sco OB2; Sco-Cen assoc.; probable member of Sco-Cen cluster; upper Sco region.
note (category: stellar radii or diameters): From occult. by Jupiter, diam. Beta Sco A1 = 0.000422"; diam. Beta Sco A2 = 0.000264".

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

position, motion, parallax:

position (J2000) RA: 16h 5min 26,233sec DEC: -19 48' 19,5'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0004 arcsec/a DEC: -0,019 arcsec/a source: 25
radial velocity -1 km/s source: 25
trigonometric parallax 0,009 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 353,2 latitude: 23,6
GCI unit vector (J2000) X: -0,450963 Y: -0,825729 Z: -0,338827

magnitude:

visual 2,62 (observed) source: 25
photovisual 2,9 source: 2
photographic 2,7 source: 2

spectral information:

spectral class B1 source: 96
Morgan-Keenan B1V source: 25
B-magnitude 2,55 0,05 B-V-magnitude -0,07
U-magnitude 1,68 0,05 U-B-magnitude -0,87

variability information:

source of data: 28
variability type 9
var. amplitude 0,06

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,4 arcsec
magnitude difference between brightest and second brightest component 8
position angle 146

component magnitude spectral class catalogue(s)/name(s)
A 2,62 B1 Graffias, b1Scorpii, 8 Sco, HR 5984, HD 144217, SAO 159682
B 4,92 B1 b2Scorpii, 8 Sco, HR 5985, HD 144218, SAO 159683

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: 16h 2min 31,507sec DEC: -19 40' 12,45'' 0,004 arcsec
position (J2000) RA: 16h 5min 26,238sec DEC: -19 48' 19,37''
proper motion J1950 (FK4) RA: -0,0004 arcsec/a DEC: -0,021 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0003 arcsec/a DEC: -0,018 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B1
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 597
Durchmusterung BD-19 4307
Boss General Catalogue 21609
Henry Draper Catalogue 144217

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

position and proper motion:

position (J2000) RA: 16h 5,4min DEC: -19 48'
proper motion (J2000) RA: -0,006 arcsec/a DEC: -0,019 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 1879 34 88 0,9'' 2,62 10,6 B1V BU 947
1991 146 0,4''
AC 1823 58 24 13,6'' 2,62 4,92 B2V H 7
1980 21 -
CE 1976 10 359 0,1'' 4,9 - - MCA 42
1989 121 -

discoverer information:

discoverer code discoverer reference
BU 947 Burnham, S.W. -
H 7 Herschel, W. -
MCA 42 McAlister, H.A. -

notes:

note Beta (1) Sco. Common Proper motion with Beta (2) Sco. Speckle and occultation measures indicate a complex multiple system. H III 7. C is, Beta (2) Sco, and is a close interferometer pair found by McAlister.

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

position:

position (J1950) RA: 16h 2min 31,5sec DEC: -19 40' 12''

variability informations:

magnitute at max. brightness 2,61
magnitute at min. brightness 2,67
photometric system visual, photovisual or Johnson's V

spectral information

spectral class *

references

to a study 2472D (designation: BETA SCO)

miscanellous

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