Observation by Chris Hooker: Sinus Iridum

Uploaded by

Chris Hooker

Observer

Chris Hooker

Observed

2017 May 07 - 20:13

Uploaded

2017 May 08 - 21:26

Objects

The Moon

Equipment

Orion Optics OMC200 Maksutov-Cassegrain
Baader 610nm red filter
ZWO ASI120MM-S Mono camera

Exposure

7 msec

Location

Didcot, Oxfordshire

Target name

Sinus Iridum (Bay of Rainbows)

Title

Sinus Iridum

About this image

A well-known lunar feature imaged under good seeing conditions (Ant II, occasionally III). 1000 of 2000 frames stacked in Autostakkert; wavelet processing and histogram adjustment in Registax. The sun was too high to emphasise the wrinkle ridges across the entrance of the "bay", but there is good detail in the Jura mountains and on the floors of Helicon and LeVerrier.

Files associated with this observation

Sinus Iridum 7 May 17 1c.jpg (203.1 kB)

Like this image

Dawson, Jeremy Shears, David Basey, Chris Dole, Bill Leatherbarrow, Ron Johnson, Mark Tissington, Peter Carson, Dave Finnigan

Comments

Dawson, 2017 May 08 - 22:03 UTC

I've been experimenting with IR-pass filters and they really do help smooth out the seeing; looks like your red filter is doing a similar job - lovely crisp image, lots of craterlets, nicely captured.

Chris Hooker, 2017 May 09 - 06:16 UTC

Thank you for your comment, James. The advantage of the red filter is that the amount of light contributing to the camera signal is about three times greater than with an IR filter. Even if the seeing is marginally worse due to the shorter wavelength, my experience is that being able to use a shorter exposure more than compensates for that. It's possible that an orange or yellow filter would be even better, but at some point atmospheric dispersion would start to reduce the resolution again.

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