Multi Wavelength imaging of Neptune at High Spatial Resolution

Details Multi Wavelength imaging of Neptune at High Spatial Resolution Multi Wavelength imaging of Neptune at High Spatial Resolution

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1134m&link_type=abstract

American Astronomical Society, DPS meeting #38, #11.34; Bulletin of the American Astronomical Society, Vol. 38, p.502

Physics

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Scientific paper

We present images of Neptune with superb spatial resolution taken at near infrared, mid-infrared and microwave wavelengths in 2003.
-- Near infrared K-band (2.2 µm) images were taken using the NIRC2 and the Keck Adaptive Optics system. At these wavelengths we detect sunlight reflected off of clouds in the upper troposphere and stratosphere. In these images there are bright cloud features near 70°S and bands of cloud features that span all longitudes between 20°S and 50°S and near 30°N. The brightest features lie in the northern band of clouds.
-- Mid-infrared images were taken using the Keck LWS system in atmospheric windows at 8, 8.9, 10.7, 11.7, 12.5, 17.65, 18.75 and 22 µm. At these wavelengths we detect thermal emission from stratospheric hydrocarbons, and from hydrogen (due to collision induced opacity.) A summary of the brightness distribution follows:
* Methane emission (8 and 8.9 µm): The disk is slightly limb brightened with a bright south polar region.
* Ethane emission (12.5 and 11.7 µm): The disk is very limb brightened with a bright south polar region.
* 17.65, 18.75 and 22 µm: The equatorial region is slightly bright and the South Polar Region is very bright.
Note that at all wavelengths the region near the South Pole is the brightest.
-- Microwave images were constructed from NRAO VLA data at 0.7, 1.3, 2.0, 3.6 and 6.0 cm. At these wavelengths, an increase in brightness indicates decreased opacity of absorbers. The region surrounding the South Pole is bright in images at 1.3, 2.0 and 3.6 cm. The greatest contrast is at 2.0 cm.
Support was provided by the CfAO and NASA grant NNG06GB25G.

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