Al Dhanab
| catalogues and names | Al Dhanab, g Gru, HR 8353, HD 207971, SAO 213374, FK5: 822 |
| constellation | Grus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 21h 53min 55,7sec | DEC: -37° 21' 54'' |
| position (J1900) | RA: 21h 47min 52,5sec | DEC: -37° 50' 6'' |
| proper motion (J2000) | RA: 0,102 arcsec/a | DEC: -0,021 arcsec/a |
| radial velocity | -2 km/s note: suspected variable radial velocity |
|
| rotational velocity | 68 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,013 arcsec | |
magnitude
| visual magnitude | 3,01 (V on UBV Johnson system) |
spectral / color information
| spectral class | B8III |
| B-V-magnitude | -0,12 |
| U-B-magnitude | -0,37 |
| R-I-magnitude | -0,06 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 53min 55,73sec | DEC: -37° 21' 53,6'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0086 arcsec/a | DEC: -0,021 arcsec/a | source: 25 | |
| radial velocity | -2 km/s | source: 25 | ||
| trigonometric parallax | 0,013 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 6,11° | latitude: -51,47° | ||
| GCI unit vector (J2000) | X: 0,677538 | Y: -0,415485 | Z: -0,606889 | |
magnitude:
| visual | 3,01 (observed) | source: 25 |
| photovisual | 3,2 | source: 2 |
| photographic | 3,1 | source: 2 |
spectral information:
| spectral class | B8 | source: 96 | |
| Morgan-Keenan | B8III | source: 25 | |
| B-magnitude | 2,89 ±0,05 | B-V-magnitude | -0,12 |
| U-magnitude | 2,52 ±0,05 | U-B-magnitude | -0,37 |
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: 21h 50min 54,45sec | DEC: -37° 36' 3,59'' | ±0,009 arcsec |
| position (J2000) | RA: 21h 53min 55,744sec | DEC: -37° 21' 53,48'' | |
| proper motion J1950 (FK4) | RA: 0,0087 arcsec/a | DEC: -0,017 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0087 arcsec/a | DEC: -0,02 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,2 (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: 822 |
| Durchmusterung | CD-3714536 |
| Boss General Catalogue | 30640 |
| Henry Draper Catalogue | 207971 |