| 41. | He discovered some comets, including periodic comet 22P / Kopff and the non-periodic C / 1906 E1.
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| 42. | He co-discovered periodic comet 153P / Ikeya-Zhang.
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| 43. | Periodic comets or short-period comets are generally defined as those having orbital periods of less than 200 years.
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| 44. | It was their eleventh comet discovery overall including their discovery of two non-periodic comets, which use a different nomenclature.
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| 45. | His former mathematics professor published this note and Encke became famous as the discoverer of the short periodic comets.
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| 46. | In addition, Levy is the sole discoverer of two periodic comets : 255P / Levy and P / 1991 L3.
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| 47. | Other periodic comets that bear his name are 8P / Tuttle ( parent comet of the Ursid meteor shower; disc.
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| 48. | He also discovered the periodic comet P / 1997 B1 ( Kobayashi ), which he originally reported as an asteroid.
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| 49. | This is a periodic comet with an extremely short period of 3 years that stays entirely within the orbit of Jupiter.
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| 50. | Within the following time Encke was involved in the discovery and orbital parameter determination of other short periodic comets and asteroids.
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