Sh 2-129

Sharpless 2-129

Nebula
Image of Sh 2-129 Nebula
Observation data: epoch
Right ascension	21h 11m 48.00s
Declination	+59° 56′ 60.0″
Distance	520 ± 100  pc
Constellation	Cepheus
Designations	Sh 2-129, LBN 428
See also: Lists of nebulae

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 Ou4 (also known as Squid Nebula and Giant Squid Nebula). ^[7] The central star of Ou4 is believed to be the massive triple star system named HD 202214 (O9.5IV). ^[8]

Reference

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.