Titan - Suspected near-infrared variability

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Periodic Variations, Satellite Atmospheres, Titan, Absorption Spectra, Methane, Natural Satellites, Spectrum Analysis, Saturn, Satellites, Titan, Infrared, Spectrum, Wavelengths, Observations, Photometry, Atmosphere, Color, Data, Neptune, Procedure, Brightness, Orbits, Period, Rotation

Scientific paper

Observations were made of Titan with InSb photometers using standard J (1.25 micron), H (1.6 micron), and K (2.2 micron) filters over a 70 day interval with 0.61 m, 2.2 m, and 4 m telescopes. A beam-switching, sky-subtract mode was used with all telescopes, and evidence appears for variation at approximately the 3 sigma level of confidence. There is some indication that, if periodic, the variation may have a period twice that of the satellite's orbital period.

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