Observation by Chris Hooker: Occultation of UCAC4-410-143659 by Trito...

Uploaded by

Chris Hooker

Observer

Chris Hooker

Observed

2017 Oct 05 - 22:48

Uploaded

2017 Oct 13 - 20:35

Objects

Conjunction

Equipment

Orion Optics 254 mm F/6.3 Newtonian
ZWO ASI120MM-S camera
Wratten 23A light red filter

Exposure

0.500 second

Location

Didcot, Oxfordshire

Target name

Triton

Title

Occultation of UCAC4-410-143659 by Triton on 5 October 2017

About this image

A rare opportunity to observe the occultation of a star by Neptune's moon Triton. The observation was made very challenging by the presence of a full Moon around 30 degrees from the planet and an intermittent gusty breeze that shook the telescope at times, and made the images unusable (see third example image above). In the first image, Triton and the target star can be seen (unresolved) just to the left of Neptune. The disappearance and reappearance of the star coincided with episodes of shaking, which made timings of the event, in particular the disappearance, relatively inaccurate. However, selection of images that were not too badly distorted allowed me to make enough measurements of Triton and a comparison star (UCAC4-410-143670) to derive a light curve for the occultation, and a timing of the reappearance of the star to within 3 seconds.

Files associated with this observation

Occultation image.png (149.3 kB)

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Jeremy Shears, Chris Dole, David Swan, Len Adam, Thomas Killestein, Graham Winstanley, Dawson, David Basey, Steve Knight, Peter Carson

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