Hemisphere:  Northern  ·  Constellation: Auriga (Aur)  ·  Contains:  Flaming Star nebula  ·  IC 405  ·  The star 14Aur  ·  The star 16Aur  ·  The star 19Aur
Getting plate-solving status, please wait...
IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck

IC405 - Flaming Star Nebula

Technical card

Imaging telescopes or lenses: Teleskop Service Triplet FPL-53 APO 80/480

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Sky-Watcher EQ6-R Pro

Guiding telescopes or lenses: APM Mini Guiding Scope 50 mm

Guiding cameras: ZWO ASI120MM

Focal reducers: TS-Optics 2" PHOTOLINE 0.79x Reducer / corrector

Software: StarNet++  ·  PHD2  ·  PixInsight  ·  EQASCOM  ·  Seqence Generator Pro

Filters: Baader 2" UV/IR-Cut/L

Accessory: Pegasus Astro FocusCube 2  ·  ZWO EFW 8x31mm  ·  Omegon 2 channel dew strap controller  ·  AST Optics Dew straps  ·  Tracer 16 Ah LiFePO4 battery  ·  Tracer 7 Ah LiFePO4 battery


Dates:Dec. 30, 2019

Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 11x300" (gain: 75.00) -15C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 11x300" (gain: 75.00) -15C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 12x300" (gain: 75.00) -15C bin 1x1
Astrodon Tru-Balance 1.25" 3nm HA: 13x300" (gain: 75.00) -15C bin 1x1

Integration: 3.9 hours

Darks: ~30

Flats: ~20

Flat darks: ~100

Avg. Moon age: 4.09 days

Avg. Moon phase: 17.75%

Bortle Dark-Sky Scale: 7.00

Temperature: 1.00


Basic astrometry details

Astrometry.net job: 3216713

RA center: 5h 16' 28"

DEC center: +33° 51' 0"

Pixel scale: 2.021 arcsec/pixel

Orientation: 269.321 degrees

Field radius: 1.560 degrees


Resolution: 4456x3320

Locations: Backyard, Herent, Belgium

Data source: Backyard

Description

This is the first proper image with my new Astrodon filterset! They were delivered with a month of complementary clouds, of course :)

A couple hours of my clear sky time were wasted due to unfortunate mistakes, I should not experiment with new things in SGP during good nights. The gain was also supposed to be set to 200 for the Ha subs, as gain 75 is definitely not ideal for 5 min subs with the 3 nm filter. Green subs were not corrected well with flats, so I used DBE instead to flatten the green master.

Compared to my ZWO filters, the color balance of the Astrodons appears to be slightly different with more H-beta in the blue channel and slightly different star colors. Pure RGB is shown in Rev. G (or mouse-over of Rev. F).

The optics of my refractor don't correct very well near the UV end and I still need to use a Baader UV/IR block filter in front of my reducer to correct star bloat in the Astrodon blue and luminance filters. I think that the halos around bright stars are due to the 2" UV/IR filter, Astrodons should produce no visible reflections.

Combining the faint blue reflection components of IC405 with the intricate Halpha structures was not trivial. I processed the RGB and Ha separately, then blended a starless version of the Ha in the red and blue (20%) channel of the stretched RGB data, effectively creating a (HaR)G(HaB) image. Ha was then used as luminance (70%) on a copy of the data, labeled Ha-(HaR)G(HaB).

To correct the stars and blue reflection components, I created another copy of the RGB and brightened it a bit further. Next, I made a mask from the blue data and then used this mask plus PixelMath to add the slightly brighter RGB to the Ha-(HaR)G(HaB) image.

Comments

Revisions

  • IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    Original
  • IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    B
  • IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    C
  • IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    D
  • IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    E
  • Final
    IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    F
  • IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck
    G

B

Description: RGB

Uploaded: ...

C

Description: Adjusted background

Uploaded: ...

D

Description: Rotated

Uploaded: ...

E

Description: Reduced stars slightly

Uploaded: ...

F

Description: Increased Ha brightness and shifted color towards red

Uploaded: ...

G

Description: RGB rotated + background neutralized

Uploaded: ...

Sky plot

Sky plot

Histogram

IC405 - Flaming Star Nebula, 



    
        

            Victor Van Puyenbroeck