
Long on my to-do list has been the spectacular Simeis 147, also known as SH2-240 or the Spaghetti Nebula. A large supernova remnant (SNR) spanning the border between the Taurus and Auriga constellations, which despite its size is one of the faintest objects in the night sky and therefore not an easy astrophotography target. Moreover, given my equipment’s field-of-view the large size of the SNR would require a mosaic to fully image, which is generally out of the question here at Fairvale Observatory with the limited clear sky conditions that prevail here. Therefore, for the moment I’ve concentrated on a close-up area of the southern lobe, imaged and processed in HOO narrowband to highlight the beautiful complexity of this cosmic cataclysm that is the product of a massive stellar explosion that took place some 40,000 years ago.
Furthermore, imaging was not helped by the presence of a waning full moon and even with 10-minute exposures, only very limited detail was evident in the Ha wavelength and none in OIII, thus also making framing tricky. However, with over 12-hours integration time eventually obtained over four nights and very careful processing, my first image of this wonderful SNR does not disappoint. I hope to return to this magnificent object again in the future to add more exposures – you really cannot have too many – and perhaps eventually capture this bowl of cosmic spaghetti in its entirety one day too.


| IMAGING DETAILS | |
| Object | Simeis 147 AKA SH2-240 or Spaghetti Nebula |
| Constellation | Taurus |
| Distance | 3,000 light-years |
| Size | Total object +3.0o |
| Apparent Magnitude | Extemely faint |
| Scope | William Optics GT81 + Focal Reducer FL 382mm f4.72 |
| Mount | SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel |
| Guiding | William Optics 50mm guide scope |
| + Starlight Xpress Lodestar X2 camera & PHD2 guiding | |
| Camera | ZWO1600MM-Cool mono CMOS sensor |
| FOV 2.65o x 2.0o Resolution 2.05”/pix Max. image size 4,656 x 3,520 pix | |
| EFW | ZWOx8 EFW & 31mm Chroma 3nm Ha, OPIII & SII filters |
| Capture & Processing | Astro Photography Tool + PHD2 + Deep Sky Stacker, PixInsight v1.8.8-12, Photoshop CC, Topaz AI Denoise |
| Image Location & Orientation | Centre RA 05:41:28.486 DEC +28:01:51.616 Left = North Top = West |
| Exposures | 39 x 10 min Ha, 34 x 10 min & 9 x 10 min SII Total Integration Time: 12 hr 10 min |
| @ 139 Gain 21 Offset @ -20oC | |
| Calibration | 5 x 10 min Darks, 15 x Ha, OIII, SII flats and Flat Darks @ ADU 25,000 |
| Location & Darkness | Fairvale Observatory – Redhill – Surrey – UK Typically Bortle 5-6 |
| Date & Time | 21st December 2021 + 4th, 5th & 6th January 2022 @ +19.00h |
| Weather | Approx. <2oC RH >=80% 🌙 96% → 21% |

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