Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
Sh2-129/Ou4 (Ha-OIII), Giuseppe Donatiello
Sh2-129/Ou4 (Ha-OIII)
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Sh2-129/Ou4 (Ha-OIII)

Sh2-129/Ou4 (Ha-OIII), Giuseppe Donatiello
Sh2-129/Ou4 (Ha-OIII)
Powered byPixInsight

Sh2-129/Ou4 (Ha-OIII)

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Description

Sh2-129/Ou4 (Ha-OIII)

Credit: Giuseppe Donatiello

Please note that what you see are the true calibrated colors of the H-alpha and OIII lines (C version).

Discovered by French astro-imager Nicolas Outters, the bipolar shape and emission are consistent with it being a planetary nebula, but its actual distance and origin are unknown.

Recent investigation suggests Ou4 really lies within the emission region SH2-129 some 2,300 light-years away. Consistent with that scenario, the cosmic squid would represent a spectacular outflow of material driven by a triple system of hot, massive stars, cataloged as HR8119, seen near the center of the nebula. If so, this nebula would physically be nearly 50 light-years across.

L-RGB-Halpha-OIII composition

Frames taken with Tair-3S in 2019 and 2020. Total exposure 10h.

Comments

Revisions

  • Sh2-129/Ou4 (Ha-OIII), Giuseppe Donatiello
    Original
  • Final
    Sh2-129/Ou4 (Ha-OIII), Giuseppe Donatiello
    B
  • Sh2-129/Ou4 (Ha-OIII), Giuseppe Donatiello
    C

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Sh2-129/Ou4 (Ha-OIII), Giuseppe Donatiello