Yed Posterior
| catalogues and names | Yed Posterior, e Oph, 2 Oph, HR 6075, HD 146791, SAO 141086, FK5: 605, WDS 16183-0442 |
| constellation | Ophiuchus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Yed Posterior. |
position, motion, parallax:
| position (J2000) | RA: 16h 18min 19,3sec | DEC: -4° 41' 33'' |
| position (J1900) | RA: 16h 13min 1,7sec | DEC: -4° 26' 56'' |
| proper motion (J2000) | RA: 0,085 arcsec/a | DEC: 0,041 arcsec/a |
| radial velocity | -10 km/s note: variable radial velocity |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,043 arcsec | |
magnitude
| visual magnitude | 3,24 (V on UBV Johnson system) |
spectral / color information
| spectral class | G9.5IIIbFe-0.5 |
| B-V-magnitude | 0,96 |
| U-B-magnitude | 0,75 |
| R-I-magnitude | 0,49 |
| note (category: spectra): | Oxygen deficient relative to magnesium. |
double/multiple star system information
| separation | 110,6 arcsec |
| mag difference (of double or brightest multiple) | 9,1 |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 18min 19,29sec | DEC: -4° 41' 32,99'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0057 arcsec/a | DEC: 0,041 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| trigonometric parallax | 0,043 | ±0,004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 8,57° | latitude: 30,81° | ||
| GCI unit vector (J2000) | X: -0,427806 | Y: -0,900161 | Z: -0,081808 | |
magnitude:
| visual | 3,24 (observed) | source: 25 |
| photovisual | 3,3 | source: 2 |
| photographic | 4,3 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G9.5IIIbFe-0.5 | source: 25 | |
| B-magnitude | 4,2 ±0,05 | B-V-magnitude | 0,96 |
| U-magnitude | 4,95 ±0,05 | U-B-magnitude | 0,75 |
double/multiple star system information:
| separation between brightest and second brightest component | 110,6 arcsec |
| magnitude difference between brightest and second brightest component | 9,2 |
| position angle | 246 ° |
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: 16h 15min 40,348sec | DEC: -4° 34' 19,57'' | ±0,004 arcsec |
| position (J2000) | RA: 16h 18min 19,283sec | DEC: -4° 41' 32,92'' | |
| proper motion J1950 (FK4) | RA: 0,0054 arcsec/a | DEC: 0,039 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0056 arcsec/a | DEC: 0,042 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 | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 605 |
| Durchmusterung | BD-04 4086 |
| Boss General Catalogue | 21920 |
| Henry Draper Catalogue | 146791 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 18,3min | DEC: -4° 42' |
| proper motion (J2000) | RA: 0,085 arcsec/a | DEC: 0,041 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 |
| - | 1913 | 2 | 246° | 110,6'' | 3,24 | 12,4 | G9.5IIIb | BU 1452 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 1452 | Burnham, S.W. | - |
notes:
| note | Epsilon Oph. |