1981N1: A Neptune Arc?

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Science  14 Mar 1986:
Vol. 231, Issue 4743, pp. 1276-1278
DOI: 10.1126/science.231.4743.1276


An object in the vicinity of Neptune detected in 1981 by simultaneous stellar occultation measurements at observatories near Tucson, Arizona, was interpreted as a new Neptune satellite. A reinterpretation suggests that it may have instead been a Neptune arc similar to one observed in 1984. The 1981 object, however, did not occult the star during simultaneous observations at Flagstaff, Arizona. This result constrains possible arc geometries.