134 



ANNUAL REPORT SiVHTHSONIAN INSTITUTION, 1940 



In December 1904 a photographic search for faint satellites of 

 Jupiter was begun by Perrine with the Crossley reflector at the Lick 

 Observatory, and on the very first photographs of that search a new 



TO V 



ORBITS OF JUPITER'S SATELLITES 



FiGUKK 2. — Orbits of Jupiter's satellites. Each orbit is shown as in its own plane. The 

 line o£ nodes on the ecliptic la indicated for each orbit ; the arrows which show the 

 direction of motion are on the part of the orbit north of the ecliptic. The position of 

 perijove is marked by the arc of a small circle, concave toward Jupiter. The positions 

 of the satellites are those at the opposition of 1938. 



satellite was discovered, and a month later, in January 1905, still 

 another.^ Both were much farther from the planet than the other 

 five. Satellite V revolves around Jupiter in 11 hours and 53 minutes, 



» Publ. Astrou. Soc. Pacific, vol. 17, p. 22, 1905 ; ibid., p. 68. 



