Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's galaxy  ·  Bode's nebulae  ·  Cigar galaxy  ·  M 81  ·  M 82  ·  NGC 3031  ·  NGC 3034
M81 & M82 - Bode's and Cigar Galaxies, 



    
        

            lefty7283
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M81 & M82 - Bode's and Cigar Galaxies

M81 & M82 - Bode's and Cigar Galaxies, 



    
        

            lefty7283
Powered byPixInsight

M81 & M82 - Bode's and Cigar Galaxies

Technical card

Imaging telescopes or lenses: TPO 6" f/4 Newtonian

Imaging cameras: ZWO ASI1600MM-Pro

Mounts: Orion Sirius EQ-G

Guiding telescopes or lenses: Agena 50mm Deluxe Straight-Through Finder / Guide Scope with Helical Focuser

Guiding cameras: ZWO ASI 120 MC

Software: Nighttime Imaging 'N' Astronomy  ·  PixInsight 1.8 Ripley PixInsight

Filters: Astrodon Ha 31mm 5nm  ·  Astronomik B 31 mm Type IIc  ·  Astronomik G 31 mm Type IIc  ·  Astronomik R 31 mm Type IIc  ·  Astronomik L 31mm Type IIc

Accessory: SkyWatcher Quattro Coma Corrector  ·  ZWO EFW 8 x 1.25″/31mm  ·  DeepSkyDad Autofocuser


Dates:Feb. 4, 2019Feb. 5, 2019Feb. 7, 2019Feb. 13, 2019

Frames:
Astrodon Ha 31mm 5nm: 15x300" (1h 15') (gain: 139.00) -20C
Astronomik B 31 mm Type IIc: 90x60" (1h 30') (gain: 139.00) -20C
Astronomik G 31 mm Type IIc: 92x60" (1h 32') (gain: 139.00) -20C
Astronomik L 31mm Type IIc: 272x60" (4h 32') (gain: 139.00) -20C
Astronomik R 31 mm Type IIc: 92x60" (1h 32') (gain: 139.00)

Integration: 10h 21'

Darks: 30

Flats: 30

Avg. Moon age: 10.01 days

Avg. Moon phase: 15.64%

Bortle Dark-Sky Scale: 7.00


Astrometry.net job: 3141252

RA center: 9h 55' 27"

DEC center: +69° 20' 11"

Pixel scale: 1.299 arcsec/pixel

Orientation: -71.795 degrees

Field radius: 0.981 degrees


Resolution: 4424x3160

Data source: Backyard

Description

It was interesting to see what I could get without a light pollution filter from my apartment. Because of this I was limited to 60 second exposures for the LRGB frames. It's interesting to compare this to [my previous capture of these galaxies](https://www.reddit.com/r/astrophotography/comments/866jjo/m81_m82_bodes_and_cigar_galaxies/) from a dark site last March. Captured on February 4th 5th, 7th, and 13th, 2019 from a bortle 7 zone



**Equipment:**

* TPO 6" F/4 Imaging Newtonian

* Orion Sirius EQ-G

* ZWO ASI1600MM-Pro

* Skywatcher Quattro Coma Corrector

* ZWO EFW 8x1.25"/31mm

* Astrodon H-alpha 5nm 31mm

* Astronomik LRGB Filters- 31mm Mounted

* Agena 50mm Deluxe Straight-Through Guide Scope

* ZWO ASI-120MC for guiding

* Deep Sky Dad Autofocuser

**Acquisition:** 10 hours 23 minutes (Camera at Unity Gain, -20°C)

* Ha- 15x300"

* Lum- 272x60"

* Red- 92x60"

* Green- 92x60"

* Blue- 90x60"

* Darks- 30

* Flats- 30 per filter

**Capture Software:**

* EQMod mount control. Captured using [N.I.N.A.](https://nighttime-imaging.eu/) and PHD2 for guiding and dithering.

**[PixInsight Processing](https://i.imgur.com/nDQGxYq.png):**

* BatchPreProcessing

* SubrameSelector

* StarAlignment

* ImageIntegration

* DynamicCrop

* DynamicBackground Extraction

* **Luminance:**

* AutomaticPSF

* AdvStarMask

* Deconvolution

* TVG/MMT Noise Reduction

* HistogramTransformations

* **RGB:**

* LinearFit to Green

* Channel combination

* DBE

* PhotometricColorCalibration

* NBRGBCombination with Ha

* SCNR

* ABE

* ArcsinhStretch

* HistogramTransformation

* LRGBCombination with luminance

* ACDNR

* LocalHistogranEqualization

* [Curve](https://i.imgur.com/Gtrj6Ay.jpg)Transformations

* MorphologicalTransformation

* Annotation

Comments

Sky plot

Sky plot

Histogram

M81 & M82 - Bode's and Cigar Galaxies, 



    
        

            lefty7283