File:The Astronomical journal (1849) (14775875461).jpg

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Identifier: astronomicaljour13dudluoft (find matches)
Title: The Astronomical journal
Year: 1849 (1840s)
Authors: Dudley Observatory American Astronomical Society American Institute of Physics
Subjects: Astronomy
Publisher: New York (etc.) American Institute of Physics (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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unced in A.J., no. 326,as a variable of the Algol-ty-pe, seems to be 2.60514+ 0.100 (sin 11°.7E + 105°) days, with the epoch April 29,1894, (2948.526 Gr. M.T.) The unfavorable weather sincethis formula was obtained has prevented its satisfactory veri-fication. On the other hand, the last observations, of Sept.22, when the minimum itself was supposed to be lost inthe twilight, did not show its proximity. The formula isfounded upon the following observations, for several ofwhich 1 am indebted to Mr. Yendell. The last observa- tion of Yexdell is the time deduced by mj-self from hisobservations, reduced by my own method. E O Mean Corr. C (O-C) -13 2914.582 Y 0.659 —0.073 0.586 -0.004 0 2948.623 Y .526 + .097 .623 .000 + 5 2961 574 Y .552 + .028 .580 - .006 28 3021.565 P .470 + .095 .565 .000 +33 3034.566 P .496 + .075 .571 - .005 .579 Y 0.496 + 0.075 0.571 + 0.008 Astronomical Journal Sn. 329. COMPUTED PATH OF THE EARTHS POLE, AND COMPARISON WITH OBSERVED PLACES. +•.20 +.10 -MO +.20
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+.20 +.10 .01 MO 20 +.20 +.10 N«- 329. THE ASTRONOMICAL JOURNAL. 13c A sine-formula founded upon observations comprisedwithin 120 days can only be an approximation, and perhapsof no more value than the suggestion that the minima mayvary two hours or more from the times obtained from themean period. In the following table of observations, the times previousto the present year are only approximate. Comparisonwith the elements is too uncertain to permit their rectifi-cation, and is deferred until the elements shall have beenperfected by further observations. There are anomaliesneeding explanation, as well as confirmatory coincidences.It is especially noticeable that in 1893, while at theminima, —106, —96, —91, and —81, the observations seem confirmatory, the intermediate period, —86, on Sept. 17,shows normal brightness. It is improbable thai the un-certainty in the hour of observation will account for this;it does not seem likely that inaccuracy of the sine-formulaor of mean p

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