Celestial hemisphere:  Southern  ·  Constellation: Carina (Car)  ·  Contains:  Carina Nebula  ·  NGC 3372  ·  The star w Car  ·  eta Car Nebula
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Eta Carina II, 



    
        

            Philip Herbst
Eta Carina II
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Eta Carina II

Getting plate-solving status, please wait...
Eta Carina II, 



    
        

            Philip Herbst
Eta Carina II
Powered byPixInsight

Eta Carina II

Acquisition details

Dates:
March 18, 2022
Frames:
150×120(5h) (gain: 139.00) -20°C bin 1×1
Integration:
5h
Darks:
25
Flats:
25
Bias:
25
Avg. Moon age:
14.95 days
Avg. Moon phase:
99.96%
Bortle Dark-Sky Scale:
8.00

Basic astrometry details

Astrometry.net job: 5828258

RA center: 10h44m05s.5

DEC center: -59°4340

Pixel scale: 2.002 arcsec/pixel

Orientation: 87.848 degrees

Field radius: 1.282 degrees

Resolution: 3679x2778

File size: 13.4 MB

Data source: Backyard

Description

This is my first monochrome image. A beautiful area of our Southern skies with lots of HA. HA 180s x 75, RGB 69s x 25 each - total integration 5hrs. There was a lot to learn and I could not eliminate all the gradients. Not sure the flats worked exactly as they should have and I am sure those with better PI skills could have sorted that out. There was quite a lot of vignetting on the RGB images that needed correcting with the flats and very little on the HA images. I was surprised by this as they are all 36mm filters (although the RGB are mounted) with a relatively small ASI 1600 sensor. Perhaps the F4 of the camera lens I used is to blame. I have an Esprit 100 on the way - looking forward to putting the new gear to good use and having access to a regular autofocus routine. Clear skies, Philip

Comments

Revisions

  • Eta Carina II, 



    
        

            Philip Herbst
    Original
  • Eta Carina II, 



    
        

            Philip Herbst
    C
  • Eta Carina II, 



    
        

            Philip Herbst
    D
  • Eta Carina II, 



    
        

            Philip Herbst
    E
  • Final
    Eta Carina II, 



    
        

            Philip Herbst
    F

C

Description: I have done a reprocessing of my Eta Carina Nebula. The image was taken when I was fighting differential flexure due to a loose guide scope and I had some mount belt issues so that both the stars and nebula lack some sharpness and the stars are oval in some corners. However, I also had a major problem with my darks which had a distinct vertical line running down the left of the picture - only realised that recently as I thought it was a gradient of sorts. Anyway, I have since solved this issue and I've decided to reprocess the image with flats and bias frames only but not the defective darks. The Ha layer is great for adding detail and nebulosity but to my eye can also make the image appear flatter than without. Perhaps there is a better way to add the Ha as Lum layer to prevent this ...

Uploaded: ...

D

Description: Starless Ha Luminous layer used for detail layer

Uploaded: ...

E

Description: RGB acquired for stars mainly but the stars were poor due to the mechanical and guiding issues described above. Star colour potential is encouraging though using ArcSine Stretch. Now that I am beginning to understand what I am doing (although I realise this is likely again to change again very soon) I would like to repeat this image when the time of year comes around again as an LRGB image with more time put into it and better stars of which I will include more of perhaps.

Uploaded: ...

F

Description: A further test image in an attempt at adding HA to the RGB master, trying to avoid the image looking too flat.
Still , the star quality remains rather poor so I will re-acquire the image as planned.

Uploaded: ...

Sky plot

Sky plot

Histogram

Eta Carina II, 



    
        

            Philip Herbst

In these public groups

Southern Hemisphere Astro