- IAU page: Challis
- Depth data from Kurt Fisher database
- Westfall, 2000: 1.73 km
- Cherrington, 1969: 2.8 km
- Named for James Challis (December 12, 1803 – December 3, 1882), a British clergyman and astronomer. He was born in Braintree, Essex and died in Cambridge. He was director of the Cambridge Observatory at the University of Cambridge from 1836 until 1861, at which time he was succeeded by John Couch Adams.
James Challis in the Sourcebook Project (William R. Corliss)
- In Mysterious Universe, a handbook of astronomical anomalies (1979) :
- Page 495: Ring of Neptune (Astronomische Nachrichten, 1847).
- Page 496: Neptune, its supposed ring and satellite (American Journal of Science, 1847).
- Page 496: Reflections concerning Neptune's ring (William G. Hoyt, Sky and Telescope, 1978).