Images of Titan's Surface in the Near-IR with ADONIS

Details Images of Titan's Surface in the Near-IR with ADONIS Images of Titan's Surface in the Near-IR with ADONIS

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2004c&link_type=abstract

American Astronomical Society, DPS meeting #28, #20.04; Bulletin of the American Astronomical Society, Vol. 28, p.1130

Physics

Optics

1

Scientific paper

Titan's images were acquired with the ADONIS adaptive optics system installed at the ESO Telescope in La Silla (Chile). The near-infrared range from 1-2.5 micron was covered in 1994 and 1995, including methane atmospheric windows at 1.3, 1.6 and 2 micron with narrow-band filters and CVF. The spatial resolution after deconvolution attains 0.05 arcsec, thus yielding 16 pixels on a Titan's image diameter. The contrast is of the order of 30%. Both the leading and the trailing hemispheres have been observed. The 2-micron images show on Titan's leading hemisphere a broad bright equatorial region near 114 degrees longitude, in accordance with the HST images (Smith et al., 1995) and with spectroscopy performed at these longitudes (Coustenis et al., 1995; 1996). High-quality flat-fielding and deconvolution of our data have allowed us to resolve the bright region into several (2-3) poles. On the trailing hemisphere of Titan we have found a pronounced North-South asymmetry. The high northern latitudes are uniformly brighter than the lower equatorial and southern ones at 2 micron (``polar cap"?). Some brightness is seen also near the south pole, but less significant. We will present our images of Titan at 1.6 and 2 micron and offer some constraints on the nature of the surface features.

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