Notes of observations on Jupiter and its satellites; No. 2

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1873
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Abstract
THE following observations were made with the equatorial telescope of the observatory of Vassar College, the object-glass of which is 12t inches in diameter; the powers used varied from 200 to 250.Longitude of obs.4h 55 m 37 8 j lat.41 0 40' 50".1872, Jan. 5.At 11 h 12111 P. M. the 3d satellite and its shadow, and the 1st satellite and its shadow, were seen on the disc of Jupiter at the same time.The 3d satellite was not round, but elongated in the direction of the belts of Jupiter, as small as the shadow of the 1st and nearly as dark, the color being brown.The 1st satellite was seen as a brilliant white spot, thrown upon the dark equatorial belt of .Jupiter, yet it could be seen for only 25 minutes.The disappearance of the first satellite in transit does not seem to be a consequence of difference of brilliancy of color between it and the planet.1872, Jan. 17.8 h 15 m to 9 h 12m.A circular white spot was seen on the lower part of the broacl belt of Jupiter, sufficiently defined to be measured.On the 25th, at 8 P. M., a spot, apparently exactly like that seen on the 17th, was observed in the upper part of the broad belt, measuring nearly the same in diameter.1872, Jan. 30.The 1st satellite which was known to be upon the planet could not be seen until it touched the limit at its egress, although its path must have lain wholly within the dark belt.It was by measurement smaller in diameter than its shadow.1872, Feb. 2. The 2d satellite was seen as an irregular white spot when a little past the center of the disc.The shadow appeared to be larger than the satellite, but, on measuring, was found to be smaller.1872, Feb. 7. The 3d satellite showed a very well defined disc with no spot.Its diameter was 2"'09.1872, Feb. 26.The 4th satellite was occulted.It became very indistinct as it approached Jupiter.Its light was whiter than that of the whitest portion of the planet.It became invisible at 9 h 48 m 42 8 '64.1872, Feb. 28.The night was remarkably good.Two large white spots were seen on the equatorial belt at 7 P. M. They were well defined and were measured.They were visible for a short time only, and could not be seen to follow with the planet as it turned.Dark spots seemed to succeed them in the same position on the disc.The 3d satellite was first seen to emerge from shadow at 7h 5 m 43 8 '4.It was fully out at 7h 11 m 4 8 '4.The occultation of the 1st satellite occurred at 9 b 6 m 39 8 '4.
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Authors Molly Mitchell
Journal american journal of science
Year 1873
DOI
10.2475/ajs.s3-5.30.454
URL
https://doi.org/10.2475/ajs.s3-5.30.454
Keywords Keywords not found

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