Sh 2-129 (also known as the Flying Bat Nebula), is a large emission nebula and H II region located in the constellation Cepheus. It is part of the Cepheus molecular cloud complex and belongs to the Cep OB2 association.[1][2][3][4] Reflection nebula vdB 140 can be seen near Sh 2-129.[5][6]

Within Sh 2-129 lies a bipolar outflow nebula named Ou 4 (also known as Squid Nebula).[7] The central star of Ou4 is believed to be the massive triple star system named HD 202214 (O9.5IV).[8]

Wide-field of Sh 2-129

References

  1. ↑ "Sh 2-129". galaxymap.org. Retrieved 2025-11-29.
  2. ↑ "Flying Bat Nebula (Sh 2-129) & Squid Nebula (Ou4) | Deep⋆Sky Corner". www.deepskycorner.ch. Retrieved 2025-11-29.
  3. ↑ "Flying Bat Nebula and Squid Nebula". AAPOD2.COM. Retrieved 2025-11-29.
  4. ↑ "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2025-11-29.
  5. ↑ "Astronomers Do It In The Dark - The Flying Bat and Squid Nebulae in HaOIIIRGB - Nebulaes - Gaseous and dust nebulae (clouds)". www.astronomersdoitinthedark.com. Retrieved 2025-11-29.
  6. ↑ "SH2-129 and Ou4". www.starrywonders.com. Retrieved 2025-11-29.
  7. ↑ "Ou4 - The Squid in Sh2-129". www.waid-observatory.com. Retrieved 2025-11-29.
  8. ↑ "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2025-11-29.
source: https://en.wikipedia.org/wiki/Sh_2-129