Dabih
| 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. |
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:
| 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. |