Adaptive optics imaging of a stellar occultation by Titan
Abstract
We present resolved images of the occultation of a binary star by Titan, recorded with the Palomar Observatory adaptive optics system on 20 December 2001 UT. These constitute the first resolved observations of a stellar occultation by a small body, and demonstrate several unique capabilities of diffraction-limited imaging systems for the study of planetary atmospheres. Two refracted stellar images are visible on Titan's limb throughout both events, displaying scintillations due to local density variations. Precise relative astrometry of the refracted stellar images with respect to the unnocculted component of the binary allows us to directly measure their altitude in Titan's atmosphere. Their changing positions also lead to simple demonstration of the finite oblateness of surfaces of constant pressure in Titan's mid-latitude stratosphere, consistent with the only previous measurement of Titan's zonal wind field.
Additional Information
© 2003 Society of Photo-optical Instrumentation Engineers (SPIE). We are grateful to Leslie Young for motivating these observations and providing astrometric and flux predictions. We thank Jean Mueller for able assistance at the controls of the Palomar Hale telescope, and Tom Hayward for help configuring the PHARO camera for these unusual observations. A.H.B. is supported by an NSF Graduate Research Fellowship.Attached Files
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Additional details
- Eprint ID
- 87924
- Resolver ID
- CaltechAUTHORS:20180717-111606398
- NSF Graduate Research Fellowship
- Created
-
2018-07-17Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences (GPS)
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 4839