Dschubba


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


catalogues and names Dschubba, d Sco, 7 Sco, HR 5953, HD 143275, SAO 184014, FK5: 594, WDS 16003-2237
other names Iclarkrau
constellation Scorpius

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

note (category: star names): Dschubba; Iclarkrau.

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

position, motion, parallax:

position (J2000) RA: 16h 0min 20sec DEC: -22 37' 18''
position (J1900) RA: 15h 54min 25,1sec DEC: -22 20' 14''
proper motion (J2000) RA: -0,012 arcsec/a DEC: -0,022 arcsec/a
radial velocity -7 km/s
note: spectroscopic binaries
rotational velocity 181 km/s (uncertain) (variable)

magnitude

visual magnitude 2,32
(V on UBV Johnson system)

spectral / color information

spectral class B0.3IV
B-V-magnitude -0,12
U-B-magnitude -0,91
R-I-magnitude -0,13
note (category: colors): Color excess E(B-V) = +0.16. Conspicuous infrared deficiency.

double/multiple star system information

number of components of multiple star system 4
separation 0,2 arcsec
mag difference (of double or brightest multiple) 0,2
component ID O
note doublicity discoverd by speckle interferometry
note (category: double and multiple data): Possible quadruple system: SB 3.0, 5.0v, sep. 0.00001", 3.3v at 0.1", and 4.9v at 0.186".
note (category: spectroscopic binaries): Primary SB about 20d. Another companion 4.9v at 0.181", discovered by occultation and speckle interferometry, has longer period. Resolved by speckle observations 1986.45, sep. 0.17".

miscellaneous information

note (category: group membership): Sco OB2; Sco-Cen cluster; upper Sco region; HII region.
note (category: stellar radii or diameters): Diam. = 0.00045 - 0.00046".

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

position, motion, parallax:

position (J2000) RA: 16h 0min 20,008sec DEC: -22 37' 18,04'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0009 arcsec/a DEC: -0,022 arcsec/a source: 25
radial velocity -7 km/s source: 25
galactic coord. (B1950) longitude: 350,1 latitude: 22,49
GCI unit vector (J2000) X: -0,460369 Y: -0,800068 Z: -0,384645

magnitude:

visual 2,32 (observed) source: 25
photovisual 2,5 source: 2
photographic 2,3 source: 2

spectral information:

spectral class B0 source: 96
Morgan-Keenan B0.3IV source: 25
B-magnitude 2,2 0,05 B-V-magnitude -0,12
U-magnitude 1,29 0,05 U-B-magnitude -0,91

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
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: 15h 57min 22,318sec DEC: -22 28' 51,37'' 0,004 arcsec
position (J2000) RA: 16h 0min 20,021sec DEC: -22 37' 18,01''
proper motion J1950 (FK4) RA: -0,0007 arcsec/a DEC: -0,025 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0007 arcsec/a DEC: -0,022 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,5 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 594
Durchmusterung BD-22 4068
Boss General Catalogue 21489
Henry Draper Catalogue 143275

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

position and proper motion:

position (J2000) RA: 16h 0,3min DEC: -22 37'
proper motion (J2000) RA: -0,012 arcsec/a DEC: -0,022 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
- 1973 18 '' 2,32 - Be LAB

discoverer information:

discoverer code discoverer reference
LAB Labeyrie et al