Al Nath
| catalogues and names | Al Nath, b Tau, 112 Tau, HR 1791, HD 35497, SAO 77168, FK5: 202, WDS 05263+2836 |
| other names | Alnath, El Nath, Nath |
| constellation | Taurus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ALNATH; EL NATH; Nath. Beta Tau is also Gamma Aur, in Taurus. |
position, motion, parallax:
| position (J2000) | RA: 5h 26min 17,5sec | DEC: +28° 36' 27'' |
| position (J1900) | RA: 5h 19min 58,1sec | DEC: +28° 31' 23'' |
| proper motion (J2000) | RA: 0,022 arcsec/a | DEC: -0,175 arcsec/a |
| radial velocity | 9 km/s note: variable radial velocity |
|
| rotational velocity | 71 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,028 arcsec | |
| note (category: radial and/or rotational velocities): | Expanding circumstellar shell. |
magnitude
| visual magnitude | 1,65 (V on UBV Johnson system) |
spectral / color information
| spectral class | B7III |
| B-V-magnitude | -0,13 |
| U-B-magnitude | -0,49 |
| R-I-magnitude | -0,1 |
| note (category: spectra): | Manganese star. |
| note (category: colors): | Color excess E(B-V) = 0.00. |
double/multiple star system information
| separation | 33,4 arcsec |
| note | Worley (1978) update of the IDS |
miscellaneous information
| note (category: group membership): | Member of Pleiades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 26min 17,511sec | DEC: +28° 36' 26,67'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0017 arcsec/a | DEC: -0,175 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| trigonometric parallax | 0,028 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 178° | latitude: -3,74° | ||
| GCI unit vector (J2000) | X: 0,128659 | Y: 0,868442 | Z: 0,478805 | |
magnitude:
| visual | 1,65 (observed) | source: 25 |
| photovisual | 1,8 | source: 2 |
spectral information:
| spectral class | B8 | source: 96 | |
| Morgan-Keenan | B7III | source: 25 | |
| B-magnitude | 1,52 ±0,05 | B-V-magnitude | -0,13 |
| U-magnitude | 1,03 ±0,05 | U-B-magnitude | -0,49 |
double/multiple star system information:
| separation between brightest and second brightest component | 33,4 arcsec |
| position angle | 239 ° |
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: 5h 23min 7,71sec | DEC: +28° 34' 1,74'' | ±0,003 arcsec |
| position (J2000) | RA: 5h 26min 17,516sec | DEC: +28° 36' 26,63'' | |
| proper motion J1950 (FK4) | RA: 0,0019 arcsec/a | DEC: -0,175 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0018 arcsec/a | DEC: -0,176 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 1,8 (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: 202 |
| Durchmusterung | BD+28 795 |
| Boss General Catalogue | 6681 |
| Henry Draper Catalogue | 35497 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 5h 26,3min | DEC: +28° 36' |
| proper motion (J2000) | RA: 0,022 arcsec/a | DEC: -0,175 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 |
| - | 1898 | 1 | 239° | 33,4'' | 1,65 | - | B7III | BAR 26 |
discoverer information:
| discoverer code | discoverer | reference |
| BAR 26 | Barnard, E.E. | (Astron. J 19, 113; 1898.) |
notes:
| note | Beta Tau. |