Dabih


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 Dabih, b Cap, NSV 25105, 9 Cap, HR 7776, HD 193495, SAO 163481, FK5: 762, WDS 20210-1447A
constellation Capricornus

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

note (category: star names): Dabih. Beta1 = Dabih Major; Beta2 = Dabih Minor.

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

position, motion, parallax:

position (J2000) RA: 20h 21min 0,7sec DEC: -14 46' 53''
position (J1900) RA: 20h 15min 23,6sec DEC: -15 5' 50''
proper motion (J2000) RA: 0,042 arcsec/a DEC: 0,002 arcsec/a
radial velocity -19 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity 54 km/s (uncertain) (variable)
trigonometric parallax 0,01 arcsec

magnitude

visual magnitude 3,08
(V on UBV Johnson system)

spectral / color information

spectral class F8V+A0
B-V-magnitude 0,79
U-B-magnitude 0,28
R-I-magnitude 0,5
note (category: spectra): Also classified G0III + B8V, K0II-IIIp + A0, B8V + K0II-III, or G8II + A0V:.

double/multiple star system information

number of components of multiple star system 8
separation 0 arcsec
mag difference (of double or brightest multiple) 0,3
component ID *
note Worley (1978) update of the IDS
note (category: double and multiple data): Complex system with HR 7775, q.v. Component B, vsini 97k/s. Occultations indicate component A is multiple system: 4.0, 4.3v sep. 0.0002", 4.8v at 0.022" and 6.7v at 0.0001". A also suspected astrometric binary, 3.07 F8V. Possibly also two faint 13v components at 112" discovered by John Herschel.
note (category: spectroscopic binaries): HR 7776-7775 = AxBC. 1374.126d, K 21.9k/s, V0 -18.9k/s, msin3i 3.75, asini 376. Alternate orbit 1374.23d, K 22.44k/s, V0 -18.95k/s, msin3i 3.63, asini 382.5. Might be eclipsing. vsini of sceondary 115k/s?

miscellaneous information

note (category: stellar radii or diameters): Occultation diam. = 0.00305 - 0.00317". Diam. primary 0.0033".

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

position, motion, parallax:

position (J2000) RA: 20h 21min 0,673sec DEC: -14 46' 52,99'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0029 arcsec/a DEC: 0,002 arcsec/a source: 25
radial velocity -19 km/s source: 25
trigonometric parallax 0,01 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 29,16 latitude: -26,37
GCI unit vector (J2000) X: 0,558084 Y: -0,789589 Z: -0,255132

magnitude:

visual 3,08 (observed) source: 25
photovisual 3,3 source: 2
photographic 3,8 source: 2

spectral information:

spectral class G0 source: 96
Morgan-Keenan K0II-III source: 25
B-magnitude 3,87 0,05 B-V-magnitude 0,79
U-magnitude 4,15 0,05 U-B-magnitude 0,28

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0 arcsec
position angle 30

component magnitude spectral class catalogue(s)/name(s)
A 3,08 G0 Dabih, b Capricorni, 9 Cap, HR 7776, HD 193495, SAO 163481
B 3,46 +++

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: 20h 18min 12,2sec DEC: -14 56' 26,57'' 0,004 arcsec
position (J2000) RA: 20h 21min 0,672sec DEC: -14 46' 52,93''
proper motion J1950 (FK4) RA: 0,0027 arcsec/a DEC: 0,003 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0029 arcsec/a DEC: 0,002 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

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

catalogues

source catalogue FK4, catalogue number: 762
Durchmusterung BD-15 5629
Boss General Catalogue 28295
Henry Draper Catalogue 193495
The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given.

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

position and proper motion:

position (J2000) RA: 20h 21min DEC: -14 47'
proper motion (J2000) RA: 0 arcsec/a DEC: 0 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
- 1891 4 322 6,4'' 13 13,4 - HJ 2948
Aa 1976 3 49 0'' 3,1 - F8V+A0 BLA
1991 30 -
Aa-B 1835 11 267 205,3'' 3,1 6,2 - STF 52
Aa-C 1912 1 134 226,6'' 3,4 9 - STF 52
BC 1913 1 111 397,6'' 6,2 9 - STF 52
B-DE 1891 1 294 111,7'' - - - HJ 2948

discoverer information:

discoverer code discoverer reference
HJ 2948 Herschel, J. -
BLA Blazit, A. et al
STF 52 Struve, F.G.W. -

notes:

note Aa: Beta Cap. A is an occultation and interferometric binary, and is physical with the multiple system BAR 12 at 205". Aa-B: Beta 2 and Beta 1 Cap. A measure of Beta (2) Cap and HJ 2948A.