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Unknown object near Tulip Nebula [Deep Sky] Acquisition techniques · AstroBertUK · ... · 3 · 240 · 1

AstroBertUK 0.90
AstroBertUK
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Hi All,

I've been imaging SH2-101 The Tulip Nebula for several hours over the past two evenings between 1am & 4am from my back garden in the UK (Bortle 5). After some preliminary processing of the data, I've noticed a faint structure that I couldn't find on other images posted on Astrobin, so I was hoping someone could help identify it. I've blinked through each light frame and can see no anomalies in the area.
  • Acquisition details:
  • Camera: SV405CC
  • Filter: Optilong L-Enhance
  • Scope: Askar APO103


  • Night 1: (2025-05-01) : 69 x 120s exposures
  • Night 2: (2025-05-01) : 78 x 120s exposures


  • Flats x20
  • Dark Flats x20
  • Darks x20



Other stacking, the image below is simple unlinked STF with no additional processing and the structure clearly visible.

Any ideas?

image.png
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andreatax 9.89
andrea tasselli
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That is an IR halo.
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afeuerstein1
Albert Feuerstein
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I can also see it I my picture

https://astrob.in/7r6jbn/B/
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AstroBertUK 0.90
AstroBertUK
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Thanks guys... Mystery solved 😁 

@Albert Feuerstein Great picture. Wish I'd seen it before posting 😊
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