Sep 1877
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1877natur..16..457k&link_type=abstract
Nature, Volume 16, Issue 413, pp. 457 (1877).
Physics
Scientific paper
THE weather in this neighbourhood has been, very unfavourable for observation ever since the announcement of the discovery of two satellites of Mars. Last night, however (about 9.30), during little more than half-an-hour's interval of clear sky, the air being extremely steady, and the planet beautifully defined, I succeeded in seeing the outer satellite of the two. With the full aperture of my 18-inch silvered-glass equatorial reflector, and an ordinary achromatic eye-piece with a bar across the field hiding the planet, the satellite was but glimpsed occasionally; with a single double-concave lens (power about 180) it was visible, in spite of the brilliant light of the planet. Had I not known its exact position, however, I question whether I should have seen it at all. It is a most difficult object.
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