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Contains:  Christmas Tree cluster, Cone nebula, IC 2169, IC 448, NGC 2239, NGC 2244, NGC 2252, NGC 2264, NGC 2301, Rosette nebula, The star 12Mon, The star 13Mon, The star 15Mon, The star 16Mon, The star 17Mon, The star 18Mon, The star 75Ori, The star εMon
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Rosette Nebula, Cone Nebula, and Friends at 85mm in Ha, 


Rosette Nebula, Cone Nebula, and Friends at 85mm in Ha
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Rosette Nebula, Cone Nebula, and Friends at 85mm in Ha

Technical card

Dates:Jan. 19, 2020Jan. 25, 2020Feb. 2, 2020

Frames:STC Astro Duo-Narrowband filter (Nikon aps-c clip): 70x240" ISO200

Integration: 4.7 hours

Darks: ~40

Flats: ~15

Flat darks: ~15

Bias: ~20

Avg. Moon age: 10.84 days

Avg. Moon phase: 27.85%

Basic astrometry details job: 3240532

RA center: 6h 32' 59"

DEC center: +4° 33' 28"

Pixel scale: 9.361 arcsec/pixel

Orientation: 270.238 degrees

Field radius: 8.811 degrees

Resolution: 5694x3673

Locations: Home, Silver Spring, Maryland, United States

Data source: Backyard


This wide field image of the region around the Rosette Nebula was captured on the nights of January 19/25 and February 2, 2020 using a short telephoto lens and dual narrowband filter. The field of view also includes the Cone Nebula, Foxfur Nebula, Christmas Tree Cluster, and a scattering of H-alpha regions. This is image includes the H-alpha data (red channel).

Imaged with 85mm/F1.4 Rokinon at F/2, STC Duo Narrowband Clip Filter, and full spectrum modified Nikon D5300.

Total integration time was ~5 hours using 70 subs at ISO200 x 240 sec. Pre-processed using PixInsight Batch Pre-Processing (BPP) script. Images calibrated using darks, bias, and flats. Extracted red/green/blue channels using BatchChannelExtraction script. R, G, & B channels registered and stacked independently using StarAlighment and Integration. R channel data gives the Ha image. Averaged G & B channels using Pixelmath to generate OIII image.

R and Average of G+B channels individually post-processed in Pixinsight: Cropped, gradient removal with ABE, HDRComposition (binarizing threshold = 0.6) to combine different exposure lengths, MLT for noise reduction, stretched in two stages, stage 1 stretch using histogram transformation with starmask generaated using starnet++ (to start to bring out the nebulocity), stage 2 stretch using masked stretch, Curves Transformation, TGVDenoise for noise reduction, HDR transform, Local histogram transform, morphological transform to shrink stars.



License: None (All rights reserved)

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Rosette Nebula, Cone Nebula, and Friends at 85mm in Ha,