| 11. | There are also periodic comets which are only visible certain years, like Halley's Comet.
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| 12. | "' Comet Urata-Niijima "'is a periodic comet in the solar system discovered by years.
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| 13. | She has also co-discovered 127P / Holt-Olmstead, a periodic comet.
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| 14. | That includes Pluto, all the asteroids, all the periodic comets, and my fingernail clippings.
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| 15. | Other periodic comets that bear his name include 10P / Tempel and 11P / Tempel-Swift-LINEAR.
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| 16. | In 1951, he co-discovered the periodic comet 49P / Arend-Rigaux with his colleague Sylvain Arend.
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| 17. | He also co-discovered 112P / Urata-Niijima, a periodic comet of the Jupiter family in 1986.
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| 18. | He discovered periodic comet 87P / Bus in 1981.
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| 19. | He also co-discovered 147P / Kushida-Muramatsu, a periodic comet.
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| 20. | He also co-discovered 178P / Hug-Bell, a periodic comet.
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