| 1. | Ice is a major ingredient both in first-timers and in periodic comets.
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| 2. | The parent body of the shower is Halley's Comet, a periodic comet.
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| 3. | Periodic comets also have a number indicating the order of their discovery.
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| 4. | Chernykh discovered two periodic comets 74P / Smirnova-Chernykh and 101P / Chernykh.
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| 5. | The periodic comet 27P / Crommelin was previously called " Comet Pons-Coggia-Winnecke-Forbes ".
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| 6. | Perrine co-discovered the lost periodic comet 18D / Perrine-Mrkos and several other comets.
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| 7. | She also co-discovered the periodic comet 74P / Smirnova-Chernykh, along with Nikolai Stepanovich Chernykh.
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| 8. | He discovered a number of comets, including the lost periodic comet 34D / Gale.
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| 9. | Urata co-discovered the periodic comet 112P / Urata-Niijima in 1986.
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| 10. | Notably, he successfully predicted the 1992 return of the once-lost periodic comet Swift Tuttle.
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