FIRST ULTRAVIOLET REFLECTANCE SPECTRA OF PLUTO AND CHARON BY THEHUBBLE SPACE TELESCOPECOSMIC ORIGINS SPECTROGRAPH: DETECTION OF ABSORPTION FEATURES AND EVIDENCE FOR TEMPORAL CHANGE

S. A. Stern, N. J. Cunningham, M. J. Hain, J. R. Spencer, A. Shinn
2011 Astronomical Journal  
We have observed the mid-UV spectra of both Pluto and its large satellite, Charon, at two rotational epochs using the Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) in 2010. These are the first HST/COS measurements of Pluto and Charon. Here we describe the observations and our reduction of them, and present the albedo spectra, average mid-UV albedos, and albedo slopes we derive from these data. These data reveal evidence for a strong absorption feature in the mid-UV spectrum of
more » ... luto; evidence for temporal change in Pluto's spectrum since the 1990s is reported, and indirect evidence for a near-UV spectral absorption on Charon is also reported.
doi:10.1088/0004-6256/143/1/22 fatcat:xdvv7pxawvazjkptd3qrbiwvqy