Portrait of Friedrich Bessel,German astronomer
Numéro d’image : 11827391
| Friedrich Bessel. Portrait of Friedrich Wilhelm Bessel (1784-1846),German astronomer. He studied the perturbations of planetary and stellar motions,inventing the Bessel mathematical func- tions to aid his analyses. In 1838 he was the first to establish the distance to a star by measuring its apparent angular motion (parallax),using 61 Cygni as his first object. He predicted that a small companion star formed a binary system with Sirius. He computed the mass of Jupiter by analysing the orbits of its satellites,and found that it had a relatively low density. He suggested the existence of the planet beyond Uranus,but died a few months before the discovery of Neptune | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library |
| Taille de l’image : | 3626 px × 4919 px |
| Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
| Property Release : | Non requis |
| Restrictions : | - |
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