Improved Determination of Ethane (C2H6) Abundance in Titan's Stratosphere |
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| Authors: | Timothy A Livengood Tilak Hewagama Theodor KostiukKelly E Fast Jeffrey J Goldstein |
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| Institution: | a Challenger Center for Space Science Education, 1250 North Pitt Street, Alexandria, Virginia, 22314, f1timothy.a.livengood@gsfc.nasa.govf1b NASA's Goddard Space Flight Center, Code 693, Greenbelt, Maryland, 20771c Department of Astronomy, University of Maryland, College Park, College Park, Maryland, 20742-2421d Challenger Center for Space Science Education, 1250 North Pitt Street, Alexandria, Virginia, 22314 |
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| Abstract: | Ethane spectral lines were observed in emission from Titan in August 1993, October 1995, and September 1996, at a spectral resolution of λ/Δλ≈106, at wavelength 11.7−11.9 μm using the Goddard Infrared Heterodyne Spectrometer at the NASA Infrared Telescope Facility on Mauna Kea, Hawaii. The ethane mole fraction is determined to be (8.8±2.2)×10−6 (68.3% confidence limits, “1σ”), averaging the retrievals from each observing run obtained using the “recommended” thermal profile of R. V. Yelle, D. Strobel, E. Lellouch, and D. Gautier (1997, in Huygens: Science, Payload, and Mission (J.-P. Lebreton, Ed.), pp. 243-256, European Space Agency SP-1177). |
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| Keywords: | satellites of Saturn |
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