Head of Hydrus
| catalogues and names | Head of Hydrus, a Hyi, HR 591, HD 12311, SAO 248474, FK5: 72 |
| constellation | Hydrus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Head of Hydrus. |
position, motion, parallax:
| position (J2000) | RA: 1h 58min 46,2sec | DEC: -61° 34' 11'' |
| position (J1900) | RA: 1h 55min 37,1sec | DEC: -62° 3' 23'' |
| proper motion (J2000) | RA: 0,264 arcsec/a | DEC: 0,027 arcsec/a |
| radial velocity | 1 km/s note: variable radial velocity |
|
| rotational velocity | 153 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,048 arcsec | |
magnitude
| visual magnitude | 2,86 (V on UBV Johnson system) |
spectral / color information
| spectral class | F0V |
| B-V-magnitude | 0,28 |
| U-B-magnitude | 0,14 |
| R-I-magnitude | 0,14 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 1h 58min 46,201sec | DEC: -61° 34' 11,43'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,037 arcsec/a | DEC: 0,027 arcsec/a | source: 25 | |
| radial velocity | 1 km/s | source: 25 | ||
| trigonometric parallax | 0,048 | ±0,005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 289,45° | latitude: -53,76° | ||
| GCI unit vector (J2000) | X: 0,413575 | Y: 0,235827 | Z: -0,879398 | |
magnitude:
| visual | 2,86 (observed) | source: 25 |
| photovisual | 3 | source: 2 |
| photographic | 3,3 | source: 2 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | F0III-IVn | source: 25 | |
| B-magnitude | 3,14 ±0,05 | B-V-magnitude | 0,28 |
| U-magnitude | 3,28 ±0,05 | U-B-magnitude | 0,14 |
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 | |
| 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: 1h 57min 11,703sec | DEC: -61° 48' 45,44'' | ±0,009 arcsec |
| position (J2000) | RA: 1h 58min 46,229sec | DEC: -61° 34' 11,41'' | |
| proper motion J1950 (FK4) | RA: 0,0379 arcsec/a | DEC: 0,033 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0373 arcsec/a | DEC: 0,027 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 72 |
| Durchmusterung | CP-62 162 |
| Boss General Catalogue | 2405 |
| Henry Draper Catalogue | 12311 |