Table 1
Circumstances of observation.
| August 23, 2016 | |
|---|---|
| Ref. frame UT time (h:min:s) | 05:33:51.9581 |
| MJD epoch of ref. frame | 57 623.23185137 |
| Geocentric distance (AU) | 28.959 |
| Heliocentric distance (AU) | 29.954 |
| Phase angle (deg) | 0.35138 |
| B (deg) | −26.133 |
| P (deg) | 326.237 |
| U (deg) | 318.808 |
| Number of used images | 68 |
| Individual exposure time (s) | 64 |
| Scale (mas pixel−1) | 12.255 ± 0.009 |
Notes. The epoch given is the time of the reference frame used to produce the equivalent width profile (see Sect. 3.1). The geocentric and heliocentric distances, as well as the phase angle, are retrieved from the Rings Node of NASA’s Planetary Data System (http://pds-rings.seti.org). The angles B, P, and U are the ring’s opening angle to Earth, Neptune’s pole orientation, and the longitude of Earth measured in the ring plane from the J2000.0 ascending node of Neptune’s equatorial plane, respectively. The pixel scale value is that given by Maire et al. (2016).
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