Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  NGC 4627  ·  NGC 4631  ·  NGC 4656  ·  NGC 4657  ·  PGC 1969714  ·  PGC 1973273  ·  PGC 1977697  ·  PGC 1981071  ·  PGC 1983264  ·  PGC 1987386  ·  PGC 2003430  ·  PGC 2832120  ·  PGC 42405  ·  PGC 42593  ·  PGC 42772
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NGC4631 & 4656, Daniel.P
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NGC4631 & 4656

Getting plate-solving status, please wait...
NGC4631 & 4656, Daniel.P
Powered byPixInsight

NGC4631 & 4656

Equipment

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Acquisition details

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Description

During this imaging session I did my first automated merian flip !!!!

It was an "attended" meridian flip, I was able to check that all was going very very well :

- At 0h11 (30 april) light frame n°24 ended and initiated the MF

- SGP performed a plate solve for "sync" current coordinates

- Mount move from W to E side of pier (PHD2 idsconneted at the same time)

- SGP performed Centering routine (in the Target Offset mode) and after 3 iterations obtained less than 5 pixels total error (5 arcsec).

- SGP relauch PHD2 in (my multi star) autoselect and stabilize guiding

- SGP performed auto focus routine (which pause guiding)

- At 0h17 : SGP initiate Light frame n°25

The total MF duration was 6 minutes.

Original image is LRGB without Ha.

I selected gain 0 (5e- / ADU) by mistake especially for the Ha frames which were RON dominated.

The processing was done in PI as follow (version original):

For each L, R ,G ,B and Ha channels :

- Flat Field Dark Substraction

- Flat Field Integration

- Images Calibration (Dark Substraction and FF correction)

- Cosmetic Correction

- Image Registration

- Image Integration

- DBE or ABE

- Deconvolution masked with 2.3 pixel psf

- TGV denoise for Light frame only

Then :

- Creating RGB image from RGB channels

- Color balance and Color saturation on stars of RGB

- Nonlinear Image Creation with L and RGB and Ha

- Extract R, g, b channels from RGB

- Created LRGB color image

- Add Ha to R in NL mode

- Created LRGBHa image

- Use clone stamp to clean some red artefacts coming from Ha channel adding

Final image adjustments performed in Iphoto on Imac (levels adjustments, +10% color sat, crop and deflip)

Comments

Revisions

  • NGC4631 & 4656, Daniel.P
    Original
  • NGC4631 & 4656, Daniel.P
    B
  • NGC4631 & 4656, Daniel.P
    C
  • Final
    NGC4631 & 4656, Daniel.P
    D

B

Description: RGB only

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C

Description: L frames only

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D

Description: L RGB Ha

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Sky plot

Sky plot

Histogram

NGC4631 & 4656, Daniel.P