Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Great Cluster in Hercules  ·  Hercules globular cluster  ·  IC 4617  ·  M 13  ·  NGC 6205  ·  NGC 6207
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Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P
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Messier 13 with APO 130 & ZWO1600MMcool

Getting plate-solving status, please wait...
Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P
Powered byPixInsight

Messier 13 with APO 130 & ZWO1600MMcool

Equipment

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Acquisition details

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Description

Version D has an added deconvolution to correct from some star elongation.

This is my first and very modest "Luminance" frame using my new setup.

It is only 3 x 5 minutes.

I have done some measurements about the sensor @ gain 139 (supposed unit gain) and -15°C :

Read Noise = 1.67 e-

Dark Current = 0.0088 e-/s

Gain = 0.98 e-/DN

This is perfectly in line with the ZWO specifications.

I have also measured the Read Noise @ maxi gain 300 and found : 1.18 e-

I have attached the field curvature analysis showing that the collimation of the new APO (performed on daylight using an artificial star) can be perfected. On version B and C, you can see that the collimation is almost good at the bottom-center of the sensor. I will need to do the final adjustments.

The processing was done in PI as follow :

- Flat Field Dark Substraction

- Flat Field Integration

- Images Calibration (Dark Substraction and FF correction)

- Cosmetic Correction

- Image Registration

- Image Integration

- Sky Background Correction (DBE)

- Noise Reduction (Demure)

- Nonlinear Image Creation

Final image adjustments performed in Iphoto on Imac (levels adjustements)

Some remarks :

- I have applied the advice from other user of the ASI1600 to do straight dark substraction of dark taken at same integration time and same temperature. I have checked hat the amp glow is fully removed with this approach.

- The Demure noise reduction is very effective with the mono images.

Comments

Revisions

  • Final
    Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P
    Original
  • Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P
    B
  • Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P
    C
  • Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P
    D

Sky plot

Sky plot

Histogram

Messier 13 with APO 130 & ZWO1600MMcool, Daniel.P