Comet Borrelly–Daniel, formally designated as C/1909 L1, is a non-periodic comet that was co-discovered by astronomers, Alphonse Borrelly and Zaccheus Daniel. It was the seventh comet discovery by Borrelly and the third one for Daniel. About two weeks prior to discovery, the comet made its closest approach to Earth at a distance of 0.852 AU (127.5 million km) on 30 May 1909.
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External links C/1909 L1 at the JPL Small-Body Database