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The Source of Saturn’s G Ring
Porco, Carolyn C.; Hedman, Matthew M.; Burns, Joseph A. +6 more
The origin of Saturn’s narrow G ring has been unclear. We show that it contains a bright arc located 167,495.6 ± 1.3 km from Saturn’s center. This longitudinally localized material is trapped in a 7:6 corotation eccentricity resonance with the satellite Mimas. The cameras aboard the Cassini spacecraft mainly observe small (1 to 10 micrometers) dus…
Io’s Atmospheric Response to Eclipse: UV Aurorae Observations
Stern, S. A.; Saur, J.; Strobel, D. F. +18 more
The New Horizons (NH) spacecraft observed Io’s aurora in eclipse on four occasions during spring 2007. NH Alice ultraviolet spectroscopy and concurrent Hubble Space Telescope ultraviolet imaging in eclipse investigate the relative contribution of volcanoes to Io’s atmosphere and its interaction with Jupiter’s magnetosphere. Auroral brightness and …
Locating the Two Black Holes in NGC 6240
Canalizo, Gabriela; Max, Claire E.; de Vries, Willem H.
Mergers play an important role in galaxy evolution and are key to understanding the correlation between central black hole mass and host-galaxy properties. We used the new technology of adaptive optics at the Keck II telescope to observe NGC 6240, a merger between two disk galaxies. Our high-resolution near-infrared images, combined with radio and…
Fine Thermal Structure of a Coronal Active Region
Golub, Leon; Reale, Fabio; Shimojo, Masumi +9 more
The determination of the fine thermal structure of the solar corona is fundamental to constraining the coronal heating mechanisms. The Hinode X-ray Telescope collected images of the solar corona in different passbands, thus providing temperature diagnostics through energy ratios. By combining different filters to optimize the signal-to-noise ratio…
Jupiter’s Nightside Airglow and Aurora
Parker, Joel Wm.; Stern, S. Alan; Weaver, Harold A. +12 more
Observations of Jupiter’s nightside airglow (nightglow) and aurora obtained during the flyby of the New Horizons spacecraft show an unexpected lack of ultraviolet nightglow emissions, in contrast to the case during the Voyager flybys in 1979. The flux and average energy of precipitating electrons generally decrease with increasing local time acros…