Observation by Paul Leyland: Siarnaq, or Saturn-XXIX

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Paul Leyland


Paul Leyland


2020 Sep 13 - 22:00


2021 May 12 - 14:14



  • 0.4m Dilworth Relay
  • Starlight Xpress 814 Trius Pro
  • No filter

43 x 1-minute subs


Tacande Observatory, MPC J22

Target name

Siarnaq, aka Saturn XXIX


Siarnaq, or Saturn-XXIX

About this image

A tricky one this, as at the time of observation the V=20.9 magnitude satellite was only a few seconds of arc away from a star 2.5 magnitudes brighter --- a factor of ten in intensity.

The images are (left) stacked on the stars, showing a trailed Siarnaq, and stacked on the predicted motion of the satellite (right), showing noticeably trailed stars and a round satellite, though at poor contrast from light bleeding in from the star. The quality is not as good as I would hope because there are clear guiding errors on the stars. Two remedies spring to mind. The first is to try again later this year and the other is to deconvolve the image using a bright unsaturated star to estimate the point spread function.

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