Arkab Prior
catalogues and names | Arkab Prior, b1Sgr, HR 7337, HD 181454, SAO 229646, FK5: 1502, WDS 19226-4428A |
constellation | Sagittarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
note (category: star names): | Arkab Prior; Arkab or Urkab with HR 7343. |
position, motion, parallax:
position (J2000) | RA: 19h 22min 38,3sec | DEC: -44° 27' 32'' |
position (J1900) | RA: 19h 15min 27sec | DEC: -44° 38' 48'' |
proper motion (J2000) | RA: 0,009 arcsec/a | DEC: -0,02 arcsec/a |
radial velocity | -11 km/s | |
rotational velocity | 84 km/s (uncertain) (variable) |
magnitude
visual magnitude | 4,01 (V on UBV Johnson system) |
spectral / color information
spectral class | B9V |
B-V-magnitude | -0,1 |
U-B-magnitude | -0,39 |
double/multiple star system information
separation | 28,3 arcsec |
mag difference (of double or brightest multiple) | 3,3 |
note | Worley (1978) update of the IDS |
note (category: double and multiple data): | CPM. Companion A5V; vsini 129k/s, optical? |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 19h 22min 38,296sec | DEC: -44° 27' 32,29'' | ±0,06 arcsec | source: 15 |
proper motion (J2000) | RA: 0,0009 arcsec/a | DEC: -0,02 arcsec/a | source: 25 | |
radial velocity | -11 km/s | source: 25 | ||
galactic coord. (B1950) | longitude: 353,62° | latitude: -23,93° | ||
GCI unit vector (J2000) | X: 0,251822 | Y: -0,667853 | Z: -0,700398 |
magnitude:
visual | 4,01 (observed) | source: 25 |
photovisual | 4,2 | source: 2 |
photographic | 4,2 | source: 2 |
spectral information:
spectral class | B8 | source: 96 | |
Morgan-Keenan | B9V | source: 25 | |
B-magnitude | 3,91 ±0,05 | B-V-magnitude | -0,1 |
U-magnitude | 3,52 ±0,05 | U-B-magnitude | -0,39 |
double/multiple star system information:
separation between brightest and second brightest component | 28,3 arcsec |
magnitude difference between brightest and second brightest component | 3,23 |
position angle | 77 ° |
component | magnitude | spectral class | catalogue(s)/name(s) |
A | 4,01 | B8 | Arkab Prior, b1Sagittarii, HR 7337, HD 181454, SAO 229646 |
B | 7,21 | A3 |
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: 19h 19min 2,816sec | DEC: -44° 33' 17,72'' | ±0,011 arcsec |
position (J2000) | RA: 19h 22min 38,276sec | DEC: -44° 27' 32,41'' | |
proper motion J1950 (FK4) | RA: 0,0006 arcsec/a | DEC: -0,018 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0,0006 arcsec/a | DEC: -0,02 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4,3 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
spectral class | B8 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 1502 |
Durchmusterung | CD-4413277 |
Boss General Catalogue | 26703 |
Henry Draper Catalogue | 181454 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 19h 22,6min | DEC: -44° 28' |
proper motion (J2000) | RA: 0,009 arcsec/a | DEC: -0,02 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 |
- | 1835 | 15 | 77° | 28,3'' | 3,98 | 7,21 | B8V F0V | DUN 226 |
discoverer information:
discoverer code | discoverer | reference |
DUN 226 | Dunlop, J. | - |
notes:
note | Beta (1) Sgr. B is CD-44@13278. Proper motion of B +011 |