Sodium D Granulation
Taken by John ONeal on May 15, 2017 @ Shiloh Observatory Complex, Statesville, NC
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Details:
2 piece mosaic, Shot May 15th, 2017 with a DAYSTAR FILTERS Sodium D QUARK. Imaged under pristene seeing conditions @ the Shiloh Observatory in North Carolina, USA highlighting Sodium Granulation.
Telescope was an Explore Scientific 152mm f/6.5 @ 889mm Focal Length, yielding f/28 or 3,823mm Effective Focal Length with the QUARKs built in 4.3x telecentric barlow.
Camera was a ZWO ASI174mm with DAYSTAR FILTERS Interference Eliminator inline. Also captured 500 frame flat by defocusing.
3,000 16bit serial frames captured in Sharpcap and 10% stacked in Autostakkert! 2.6.8.
Wavelet sharpened in Registax 6.0.1.8
Cropped, Stretched and Colorized in The Gimp 2.8.18
Comments
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Hi John,
Interesting !
If your image woud have been done at the same time at 720 nm as I did mine ( http://spaceweathergallery.com/indiv_upload.php?upload_id=135509 ) would the granulation structure be exactly the same on both pictures or not ?
BR
Sylvain
Posted by sweiller 2017-05-16 10:41:18
I do believe You are not supposed to see granulation/convection cells at this wavelength (588.9nm). I think you maybe have an infrared bleed or some other contiuum coming through your filter, or are off band. It should look very diffuse, like fire.
Posted by amplelight 2017-05-16 13:56:01
9 thumbs up
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