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Comet Borrelly
Comet Borrelly itself was discovered by Alphonse Borrelly on the evening of Dec. 28th,1904 in Cetus as it headed for a mid-January perihelion. The new comet was found to have a period of 6.91 yrs, which had at first made the next returns more favourable than at discovery to become progressively less favourable. During this period the gravity of Jupiter tugged on the comet and increased its period to almost precisely 7 yrs.This situation temporarily locked the time of perihelion passage to within a few days of mid-June causing the comet to missed entirely in 1939 and 1946, and marginally detectable in 1953, 1960, 1967, and 1974. However, by the 1974 apparition Jupiter had shortened the comet's period to about 6.8 years, setting up conditions for the favourable returns of 1981,1987,and 1994.
Comet Borrelly itself was discovered by Alphonse Borrelly on the evening of Dec. 28th,1904 in Cetus as it headed for a mid-January perihelion. The new comet was found to have a period of 6.91 yrs, which had at first made the next returns more favourable than at discovery to become progressively less favourable. During this period the gravity of Jupiter tugged on the comet and increased its period to almost precisely 7 yrs.This situation temporarily locked the time of perihelion passage to within a few days of mid-June causing the comet to missed entirely in 1939 and 1946, and marginally detectable in 1953, 1960, 1967, and 1974. However, by the 1974 apparition Jupiter had shortened the comet's period to about 6.8 years, setting up conditions for the favourable returns of 1981,1987,and 1994.
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