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SH2-129 and OU4, 


            Ivaylo Stoynov

SH2-129 and OU4

Technical card

Imaging telescopes or lenses: William Optics Megrez 80 FD

Imaging cameras: QHYCCD QHY 22

Mounts: Takahashi EM-200

Guiding telescopes or lenses: ZWO 60/280 GuideScope

Guiding cameras: QHY5L-II Mono

Focal reducers: William Optics FF/FR 0.8x II

Software: PixInsight PixInsinght 1.8 RC7  ·  PHD guiding  ·  photoshop  ·  APT - Astro Photography Tool

Filters: Astrodon O-III 3nm  ·  Astrodon HII-3nm

Dates:Oct. 7, 2018Nov. 9, 2018Nov. 11, 2018

Astrodon HII-3nm: 18x600" -40C bin 1x1
Astrodon O-III 3nm: 24x900" -40C bin 1x1

Integration: 9.0 hours

Avg. Moon age: 11.08 days

Avg. Moon phase: 7.34%

Basic astrometry details job: 2431627

Resolution: 1367x1080

Locations: Nedelkovo, near Sofia, Bulgaria

Data source: Backyard


This object is in my ToDo list for very long time and looking on the list it will still remain there because the result is not the wanted one...

The red nebula is part of SH2-129 known as Flying Bat. The interesting part and the main target of this not so successful project is the nebula OU4, discovered by the French Amateur astrophotographer Nicolas Outters in 2011. It is very faint and requires very serious imaging time. The OU4 (also named the Squid Nebula) is OIII object which is considered as outflow of ionized oxygen emanating from the triple star system HR8119 (located in the center of the frame). Other hypothesis about the OU4 is that it is a planetary nebula. Interesting is that both SH2-129 has no relation between them. The SH2-129 is around 1300 l.y. away from Earth while OU4 is at around 2300 l.y.

The OU4 imaging time is 6h in 15min exposures and is still barely visible!!! Next time will try with at least twice the time, in 20 or even 30min exposures. The revisions A and B are only the OIII channel.



Ivaylo Stoynov
License: None (All rights reserved)


  • SH2-129 and OU4, 


            Ivaylo Stoynov
  • SH2-129 and OU4, 


            Ivaylo Stoynov
  • Final
    SH2-129 and OU4, 


            Ivaylo Stoynov


SH2-129 and OU4, 


            Ivaylo Stoynov