Observation by Paul Leyland: Caliban (Uranus XVI)

Uploaded by

Dr Paul Leyland

Observer

Paul Leyland

Observed

2020 Jan 13 - 23:00

Uploaded

2020 Jan 18 - 13:15

Objects

Uranus

Equipment

0.4m Dilworth-Relay
SX Trius Pro 814
No filter

Exposure

356 30-second subs, average stacked (2h58m total)

Location

Tacande Observatory, MPC J22

Target name

Caliban (Uranus XVI)

Title

Caliban (Uranus XVI)

About this image

It occurred that median co-addition tends to lead to noisier images than taking the average of the subs and, further, a little gentle smoothing might improve the visibility of such a faint object. Accordingly, although the data going into this image is exactly the same as that in https://britastro.org/node/20438, the subs are average stacked and the result smoothed with a 3-pixel diameter, 0.3 pixel sigma Gaussian function. Essentially the same contrast-stretching was used as in the earlier image.

In my opinion, Caliban is now rather easier to see but it is still far from being blindingly obvious.

Files associated with this observation

c2.png (40.0 kB)

Like this image

David Swan, Mark Phillips, Peter Mulligan, Andy Wilson, Peter Carson, Andrew Dumbleton

Comments

Dr Paul Leyland, 2020 Jan 18 - 18:48 UTC

Sorry folks. I made a cut and paste error when filling in the submission form. It has now been corrected from the initial and erroneous 1080s. The earlier submission of the median-added image contained the correct data.

Mike Foulkes, 2020 Jan 20 - 19:38 UTC

Excellent

Dr Paul Leyland, 2020 Jan 24 - 16:57 UTC

Another two hours fiddling produced a clearer image. Rather than posting it here and cluttering the place with yet another copy of the same data I will point you to http://www.astropalma.com/Projects/Satellites/caliban.html

The differences are that I dumped some of the poorer subs (worse than average seeing or tracking errors), tweaked the contrast stretching some more, used a positive image (white stars on grey sky) and presented a somewhat wider FOV.

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