Contains:  Solar system body or event
Sun on June 12th 2022, Björn

Sun on June 12th 2022

Acquisition type: Lucky imaging
Sun on June 12th 2022, Björn

Sun on June 12th 2022

Acquisition type: Lucky imaging

Equipment

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Acquisition details

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Description

This is my todays image of the Sun. We have a few nice sun spots there which make it worth to capture some data.

Since I am using a Baader Solar Continuum filter at 5400Å with an estimated 100 to 120Å FWHM, I'm not colouring the image. Besides that our Sun is white.

The image rotation is about 90 degrees, in order to have a better image orientation for viewing on the screen. Hence, up and down doesn't match Sun's rotational axis.

I'm recently experimenting with deconvolution on solar system imaging. I've computed the point spread function of my telescopes aperture and use it as a deconvolution kernel. Since the diffraction pattern strongly depends on the focal ratio, the effect is pretty noticeable on the revisions B and C, where the focal ratio increased from 6.9 to 18.6 leading to a quite significant Airy pattern. 

Clear skies!

Björn

Comments

Revisions

  • Final
    Sun on June 12th 2022, Björn
    Original
  • Sun on June 12th 2022, Björn
    B
  • Sun on June 12th 2022, Björn
    C
  • Sun on June 12th 2022, Björn
    D

B

Title: Detail 1

Description: Using an additional Barlow lens which increased focal length by about 2.7, I've taken a closer look at the sun spots.

Uploaded: ...

C

Title: Detail 2

Description: Using an additional Barlow lens which increased focal length by about 2.7, I've taken a closer look at the sun spots.

Uploaded: ...

D

Title: Deconvolution with aperture PSF

Description: Before and After: subregion of revision C. Left is the original data and right is after deconvolution with the PSF caused by the aperture diffraction. Deconvolution has been run for 80 iterations.

I should emphasize that extreme care needs to be taken and the image closely examined to not introduce deconvolution artifacts instead of actual image restoration.

Uploaded: ...

Histogram

Sun on June 12th 2022, Björn

In these collections

Solar system