... rings are the most prominent, evident to Galileo even if he was unable to discern their nature; the Uranian rings were ... rings are hypothesised to include at least some water ice particles; previous spectroscopic observations had shown variable ...
... 1.13 Completed Two Sets of HSP/PMT 3373 (The Size and Composition of Planetary Ring Particles - Cycle 2 High) The High Speed Photometer was used to make observations of star 00460 as it passed behind the rings of the planet Saturn. ...
... Besides searching for the shepherds, the current HST program will use the High Resolution Camera on ACS to measure the thickness of the rings, and study the colours of the recently discovered fainter rings. ...
... center to ~70 in the star-forming ring at 10 kpc, consistent with the metallicity ... In the 10 kpc ring the average ЮВ is ~1.9, in good agreement with values determined ...
... M31 by splitting the observed structure into a set of spiral arms and offset rings ... We fit radii of 10.3 and 15.5 kpc to the two most prominent rings. ... spiral with a pitch angle of 8.ТА9 to the GMCs not associated with either ring ...
... The radius of the first ring of the Image PSF is very close to that in the Tiny TIM ... The second ring can clearly be seen in the Tiny TIM PSF but not in the others ...
... We find that a ring, containing grains larger than 180 ЮМm and at radii of 86-200 AU ... This ring could be associated with a population of larger asteroidal bodies ... encounters among these large bodies in the ring produce the small debris that is ...