Periodical Cornets Due in 1890.
o OF the four periodical comets which are expected to return this year, two are of well established periods, and have been «eenon several occasions; the other two have each been observed at one return, with a .prob-ibilitythat it was seen on an occasion several revolutions earlier. Broraen's was discovered at Kiel on Feb. 20, 1816. It's period is about five and a half years, and ifc was subsequently observed at returns in 1857, 1868, 1873, and 1879. Another will be due early in 18D0. D* Arrest's was discovered at Leipzig on June £8, 1851 ; ib has a period of six and a half years, and was observed in 1857-8, in 1870, and in 1877. It escaped observation in ihe winter of 1883, but another return will be due next summer. M. Coggia discovered a small comet at Marseilles on Nov. 10. 1873. The investigation of Professor "*S r eiss made it probable that this was identical with one detected by Pons on Feb. 23, 1818, but, though its period is probably about fivo and a half years in : duration, it has not been seen since 1878. Returns, if that be tbe true period, were , due in 1879 and 1884 ; and another will be ; expected to take place *arly in 1890. Mr; Denning discovered a cemet at Bristol on Oct. 4, 1881. This has been thought to be : identical with the comet found by M. 1 Blanpain on Nov. 28, . IS 19. The last determination, says Mr T. Lynn in Knowledge, of the orbit of Denning's comet is that of Mr W. E. Plummer, published in No. 25 of Copernicus, which makes its period 3235 days, or about 8-8 years, so that as the perihelion passage in 1881 took place on Sept. 13, the nexb will be due soon after midsummer, 1890. Professor Winnecke suggested that Denning's comet might be identical with one seen (once only) by Goldschmidt on May 16, 1855, and which was also thought to have been identical with the last comet of De Vico. But as Goldschmidt could only obtain one approximate position, neither of these conjectures admits of proof.
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Bibliographic details
Star (Christchurch), Issue 6787, 26 February 1890, Page 1
Word Count
359Periodical Cornets Due in 1890. Star (Christchurch), Issue 6787, 26 February 1890, Page 1
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