Acknowledgement. We thank Science for their permission to use an excerpt from:

Broadfoot, A. L., et al. 1989. Ultraviolet Spectrometer observations of Neptune and Triton. Science 246 (4936), 1459-1466. (Excerpt from p. 1465.)

Copyright AAAS, December 15, 1989.

Ultraviolet Spectrometer observations of Neptune and Triton

Rings. In addition to the atmospheric occultations described here, the UVS also observed an occultation of the B2.5 V star sigma Sagittarii by the ring system. This occultation (Table 1), which was simultaneously observed by the photopolarimeter experiment (29), intersected the ring plane between 3.1 and 1.7 R_N. The only event unambiguously identified in the UVS data is associated with N1R. This event appears as a low tau feature (mean tau = 0.02) having a total width of approximately 35 km with a somewhat more opaque central core ~15 km wide. The equivalent width, defined as the width-integrated optical depth of the ring, was found to be 0.66 +/- 0.12 km. The absorption feature caused by the ring is centered at spacecraft event time 236/23:24:46.37, which corresponds to a planetocentric radius of 62,843 km for the ring, assuming a Neptune rotation pole of right ascension alpha = 298.9 degrees and declination delta = 42.8 degrees.

[Neptune Page] [Ring-Moon Systems Node Home]

Last updated Feb-27-1997