Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l..49s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Nov. 15, 1978, p. L49-L52.
Astronomy and Astrophysics
Astrophysics
7
Astronomical Photometry, Neptune (Planet), Planetary Rotation, Light Curve, Methane, Molecular Spectra, Planetary Atmospheres, Power Spectra, Rotation, Neptune, Photometry, Atmosphere, Methane, Longitude, Observations, Spectrum, Wavelengths, Period
Scientific paper
Photometric observations of Neptune with a highly accurate doubly differential photometer, two filters centered in the 6190-A band of methane, and two immediately adjacent continuum filters centered at 5993 and 6332 A are reported which were performed in the interval from March 29 to August 8, 1977. The principal rotation period of at least a major methane albedo feature of Neptune's deeper atmosphere is found to be 18.44 + or - 0.01 (est. error) hr, assuming that such features are stable in longitude over weeks or months. The result obtained is compared with previous determinations, and reasons for a discrepancy between the present and a previous photometric period are considered. It is suggested that the period of 18.44 hr is likely to be quite close to that of the main body of Neptune.
Slavsky D.
Smith Jeffrey H.
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