HST/FOC Imaging of Triton

Details HST/FOC Imaging of Triton HST/FOC Imaging of Triton

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icar..150..297f&link_type=abstract

Icarus, Volume 150, Issue 2, pp. 297-302 (2001).

Computer Science

3

Scientific paper

We present an analysis of HST/FOC images of Triton obtained on 20-24 September 1995. Images were taken in two wavelength bands using the F278M and F410M filters in order to obtain the first mid-UV map of Triton and to place further compositional constraints on Triton's surface by imaging farther into the UV than did Voyager. Our disk-resolved images provide full (if sparse) longitudinal coverage, with image sets taken at Triton central meridian longitudes of 100°, 210°, and 330°. We compare FOC-derived lightcurves and geometric albedo maps with 1989 Voyager imaging data and 1993 HST/FOS disk-averaged albedos. We find that Triton's disk-averaged albedo has decreased at both 2780 (12%) and 4100 Å (8%) and that an extensive region near longitude 340° has reddened significantly, with a 4100:2780 Å albedo ratio that is 15% lower than average. We conclude that these changes are evidence of recent, large-scale volatile transport on Triton.

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