This nebula is stupidly faint. For reference [this is what a single 10 minute H-alpha frame looks like](https://i.imgur.com/LdgyMLZ.png)

Sh2-250 is located at the [tip of Orion's bow](https://i.imgur.com/wsWrcSK.png) and the [galaxies NGC 1633 and 1634 are located towards the middle of it](https://i.imgur.com/n4nhDNq.jpg). I haven't been able to find any other amateur images of it other than [this one](http://www.sharplesscatalog.com/Sharpless.aspx?sharp=250) by Dean Salman. I decided to photograph this as I wanted to go after a more obscure target for first [Project Patchwork](https://www.reddit.com/r/astrophotography/comments/gt16cq/the_end_of_project_patchwork_beginning_patchwork/). This currently stands as my longest exposure time on a single target, at 30 hours and 18 mins. I'll likely attempt to add more this winter to bring out the faint hydrogen-alpha gas. I've put off processing this for a while as I wasn't pleased with previous attempts (still looks a little shit imo, needs more data). Also due to the obstructions from my apartment roof I was only able to get a couple of hours in on it each night, hence the huge number of nights it took to image. Captured on the dates in the table below from my apartment roof in downtown Athens, GA (Bortle 7).

|Month|Nights|Hours|

:--|:--|:--|

|Dec 2019|2, 5|4h 30m|

|Jan 2020|20, 21, 27, 28|12h 8m|

|Feb 2020|1, 7, 14, 27|9h 20m|

|Mar 2020|6, 17|3h 0m|

|Apr 2020|1, 2, 5|1h 20m|

---

**[Equipment:](https://i.imgur.com/6T8QNsv.jpg)**

* TPO 6" F/4 Imaging Newtonian

* Orion Sirius EQ-G

* ZWO ASI1600MM-Pro

* Skywatcher Quattro Coma Corrector

* ZWO EFW 8x1.25"/31mm

* Astronomik LRGB+CLS Filters- 31mm

* Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm

* Agena 50mm Deluxe Straight-Through Guide Scope

* ZWO ASI-120MC for guiding

* Moonlite Autofocuser

**Acquisition:** 30 hours 10 minutes (Camera at Unity Gain, -20°C)

* Ha- 164x600"

* Oiii- 10x600"

* R- 26x60"

* G- 26x60"

* B- 26x60"

* Darks- 30

* Flats- 30 per filter

**Capture Software:**

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

**PixInsight Processing:**

* BatchPreProcessing

* SubframeSelector

* StarAlignment

* [Blink](https://youtu.be/sJeuWZNWImE?t=40)

* ImageIntegration

* DrizzleIntegration (2x, VarK=1.5, Ha only)

* StarAlignment to drizzled Ha stack

* DynamicCrop

* DynamicBackgroundExtraction

* [EZ Denoise](https://darkarchon.internet-box.ch:8443/) (Ha only)

* LinearFit R and B to G

* ChannelCombination to make RGB image

* NBRGBCombination to combine Ha and Oiii with RGB

* PhotometricColorCalibration

* SCNR

* HSV Repair

* ArcsinhStretch + HistogramTransformation for stretching

* HistogramTransformation to stretch Ha channel

* LRGBCombination to add Ha as luminance to RGB

* Shitloads of [Curve](https://i.imgur.com/5HvkYKi.jpg)Transformations to adjust lightness, saturation, contract, etc

* ACDNR

* EZ Star Reduction

* Resample to 80%

* Annotation