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Jupiter’s orbit very closely and at its shortest distance to the sun 
remains still outside the orbit of Mars; the period of revolution 
amounts to about 6 years and 11 months. In 1898 and 1899 the 
comet would probably again come so near to the earth, that it can 
be observed. 
In the above-named paper Mr. Zwiers has computed the pertur- 
bations which the comet would undergo till the end of 1898 and 
later on in a paper in the “Astronomische Nachrichten” Vol. 149, 
page 9, he has continued those computations till Sept 9 1899. 
In an ephemeris added to it he has given the positions which, 
according to his computations, the comet would occupy on the 
celestial sphere. 
By the aid of this ephemeris the comet has been found back as 
a faint nebula by Perrine at the Lick-observatory on June 10th. 
Its position deviated for the computed place 22s,2 in right ascension 
and 4'17" in declination. Furthermore it appeared that the comet 
was exactly in the orbit which it had to describe according to the 
computations of Mr. Zwiers, and that a perfect correspondence was 
obtained between the observed and the computed position by adding 
0.379 days to the period of revolution. Mr. Zwiers having taken the 
mean error of the period of revolution to be + 1 day, the accuracy 
of the computations proves to be still greater than he had surmised. 
Probably of the elements computed by Mr. Zwiers only the pe- 
riod of revolution will have to be corrected a little; this cannot be 
stated however with certainty until more observations will have been 
made. For the present Mr. Zwiers has computed a corrected ephe- 
meris supposing only the period of revolution to be increased by 
0.4 day. An ephemeris corresponding entirely with this one has 
been given in n° 464 of the Astronomical Journal. 
(August 9th, 1899.) 
