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Sycorax, the 17th satellite of Uranus

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About this observation
Observer
Paul Leyland
Time of observation
08/11/2018 - 23:05
Object
Sycorax (Uranus XVII)
Observing location
MPC J22, Tacande Observatory, La Palma
Equipment
0.4m Dilworth-Relay
SBIG-8XE CCD camera
Exposure
3x30s, 4x300s, 3x600s median stacked
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Paul is embarked on an observation program to image and, where possible, perform astrometry on some of the smaller satellites in the outer solar system; this was his first attempt.  Sycorax is circled in the insert; star 'D' is V=20.65 according to the GAIA-DR2 catalogue and 'g' is an as-yet unidentified background galaxy at a (guessed) 17th magnitude.  Uranus and a 6th magnitude star were carefully placed outside the imaging region; their scattered light can be seen at the bottom edge and the top-right corner respectively.

Sycorax was discovered with the Hale 5m in September 1997 --- just over 21 years ago.  This image was taken with a 12 times smaller aperture.  The satellite has a V magnitude of 20.5 according to the MPC ephemeris.  Despite a SNR of only 4 Paul was able to measure a position good to about 0.2 arcsecs which agrees well with the published position.

Great amateur science!

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