... Other firsts for Draper include the first stellar spectrum photograph, which he took of Vega in August 1872, the first wide-angle photograph of a comet's tail, and the first spectrum of a comet's head, both of these with Tebbutt's Comet in 1881. ...
... Sodium species (NaCl and NaOH) Atomic sodium in comets is conspicuous in the coma (or, for comet HaleBopp as a ``third type'' tail) through its D 1 and D 2 lines observed in comets at r h < 1.5 AU. ...
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