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Cancer the Crab, 


Cancer the Crab
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Cancer the Crab

Technical card

Dates:Jan. 7, 2019

Astronomik B 31 mm Type IIc: 7x180" (gain: 139.00) -20C
Astronomik G 31 mm Type IIc: 7x180" (gain: 139.00) -20C
Astronomik L 31mm Type IIc: 32x180" (gain: 139.00) -20C
Astronomik R 31 mm Type IIc: 7x180" (gain: 139.00) -20C

Integration: 2.7 hours

Darks: ~30

Avg. Moon age: 1.29 days

Avg. Moon phase: 1.88%

Bortle Dark-Sky Scale: 3.00

Basic astrometry details job: 3141135

RA center: 8h 40' 6"

DEC center: +19° 57' 10"

Pixel scale: 22.594 arcsec/pixel

Orientation: 267.718 degrees

Field radius: 16.844 degrees

Resolution: 4293x3223

Locations: Deerlick Astronomy Village, Sharon, GA, United States

Data source: Traveller


This was a secondary target to my Widefield Orion image. Because Orion hit the trees at 3am, I wanted to image another target with the remaining 3 hours of astro-dark. My reasoning for capturing this constellation specifically was that I wanted to image an entire constellation, but not have to change my lens focal length or rotate the camera sensor. The Cancer constellation won out over Bootes due to the M44 cluster being right in the middle. It appears the glass in front of the sensor dewed over, resulting in some weird star halos. [Due to the subjective nature of this hobby]( I decided to keep the halos in since this is a stars only image. [Here is an annotated image highlighting the constellation lines and clusters]( Captured on the morning of January 7th, 2018 from the Deerlick Astronomy Village, a Bortle 3 Zone.



* Tamron 17-50mm f/2.8

* Orion Sirius EQ-G

* ZWO ASI1600MM-Pro

* ZWO EFW 8x1.25"/31mm

* Astronomik LRGB Filters- 31mm Mounted

* Agena 50mm Deluxe Straight-Through Guide Scope

* ZWO ASI-120MC for guiding

**Acquisition:** 2 hours 39 minutes (Camera at Unity Gain, -20°C) (Lens at 35mm f/5.6)

* L- 32x180" (1h 36m)

* R- 7x180" (21m)

* G- 7x180" (21m)

* B- 7x180" (21m)

* Darks- 30

**Capture Software:**

* EQMod mount control. Captured using [N.I.N.A.]( and PHD2 for guiding and dithering.

**[PixInsight Processing](**

* BatchPreprocessing

* ImageIntegration

* DynamicCrop

* DynamicBackgroundExtraction

* **Lum**

* TVGDenoise

* MultiscaleMedianTransform

* ArcsinhStretch

* **RGB**

* LinearFit to green

* ChannelCombination

* AutomaticBackgroundExtraction

* PhotometricColorCalibration

* HSV Repair

* ColorCalibration

* ArcsinhStretch

* HistogramTransformation

* LRGBCombination with Luminance

* HistogramTransformation again


* Several [Curve](

* Annotation



License: None (All rights reserved)

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Sky plot


Cancer the Crab,