The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters (José Manuel López Arlandis)

Celestial hemisphere: Northern · Constellation: Auriga (Aur)

The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters, José Manuel López Arlandis

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The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters

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The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters

Sh2-232 is a large, dim emission nebula located in Auriga. It is accompanied by three other smaller nebulae. The photo is taken with an EDPH61 tube, which has a short focal length of 275 mm. With the QHY268C camera (APS size sensor) it covers a field of 3.7º x 2.8º. After cropping the final field is 2º 1' 14.6" x 1d 28' 54.7", that is, about four moons wide. I continue to marvel at what we would see if we had ultra-sensitive eyes, since a lot of objects in the sky are large. The QHY268C is a color camera. I shot with an anti-pollution filter for the stars (Baader Neodynium), a dual narrow band HO filter (L-Ultimate) and another SO filter ( Askar D2). So I recomposed the H, S and O channels to make a Hubble palette (SHO). The OII signal (blue) is very poor, and the image is almost entirely red (HS). It was difficult to get some variations of color and light that gave it more life to the image. The total exposure is 16h 24m, obtained in 5 good nights. It still falls short, although the resolution is also a little limited by the equipment, which gives 2.83 sec/pixel. With drizzle he manages a little. The four HII regions, Sh2-231, Sh2-232, Sh2-233 and Sh2-235 have a common origin. They belong to the giant molecular cloud G174+2.5. The largest is Sh2-232, illuminated by the central binary star HD37737. Its central reflection zone (blue) is very weak. The brightest nebula is Sh2-235, a region very active in star formation. Sh2-232 is known as the “Pumkin Nebula”. In Spanish a pumkin and a calabash have the same name: “calabaza”. Pumkin is the English name for the large pumpkin, so it is sometimes translated to Spanish as “Nebulosa de la Calabaza de Halloween”. There is a “Calabash nebula”, which is a protoplanetary nebula located in the southern hemisphere, in Puppis.

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The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters

The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters

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The Pumkin Nebula (Sh2-232 and its sisters). Hubble palette with OSC camera and dual-band filters

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