Yerkes Observatory, Halley’s comet, 1910.

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Yerkes Observatory, Halley’s comet, 1910.

1. Yerkes Observatory, Halley’s comet (1P/1909 R1 1910 II 1909c).

2. Edward Emerson Barnard, Drawing (photograph copy) of the tail of Halley’s comet (1P/1909 R1 1910 II 1909c), by Edward Emerson Barnard, made the morning of May 19, 1910.

3. Mary Ross Calvert, Halley’s comet (1P/1909 R1 1910 II 1909c), showing division in the end of the tail.

4. Oliver Justin Lee, Halley’s comet (1P/1909 R1 1910 II 1909c), head and nucleus. Photographed with the 24-inch reflector telescope  (1 h 35 m exposure).