catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

Combined General Catalogue of Variable Stars (suspected variables)

additional / editable data

catalogues and names

catalogues and names	Graffias, b1Sco, NSV 07424, 8 Sco, HR 5984, HD 144217, SAO 159682, BD -19 4307, 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.

position, motion, parallax:

position (J2000)	RA: 16h 5min 26.2sec	DEC: -19° 48' 20''
position (2000.73)	RA: 16h 5min 29sec	DEC: -19° 48' 27''
position (B1900)	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
galactic coordinates	longitude: 353.19°	latitude: 23.6°

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

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
position (2000.73)	RA: 16h 5min 29sec	DEC: -19° 48' 26''	JD: 2451810.12
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 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 353.2°	latitude: 23.6°

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 (B1950)	RA: 16h 2min 31.507sec	DEC: -19° 40' 12.45''	±0.004 arcsec
position (2000.73)	RA: 16h 5min 29sec	DEC: -19° 48' 25''	JD: 2451810.12
position (J2000)	RA: 16h 5min 26.238sec	DEC: -19° 48' 19.37''
proper motion B1950 (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 (equinox 1950.0)

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)).

additional / editable data

entry 1 (3/26/00,2:19:59 PM)