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- Halley's comet, maximum length of tail, 15th Oct., 1835, 20° Halley's comet, length on 5th Nov. 1835 (perihelion 15th Nov.), 2° 30′ Halley's comet,—
- the catalogue was that Messier was a comet hunter, and was frustrated by objects which resembled but were not comets. He therefore compiled a list of these