Gum 10 — Emission Nebula in Vela
RA/Dec (J2000): 08h 09m, −47° 00′ (approx.)
Catalogue: Gum 10, from Colin Stanley Gum’s 1955 catalog of southern H II regions.
Historical Overview
Gum 10 is one of the many emission nebulae listed in the Gum Catalogue of Southern H II Regions (1955). Gum’s survey, conducted with the 36-inch telescope at Mount Stromlo Observatory, mapped large-scale hydrogen emission in the southern Milky Way (Gum 1955).
Unlike more famous nebulae such as Gum 12 (the Gum Nebula proper), Gum 10 is relatively obscure and faint. It appears as a diffuse patch of ionized hydrogen gas in Vela, part of the star-forming complexes of the Carina–Vela region.
Later surveys, including radio continuum mapping, confirmed Gum 10 as an extended H II region ionized by nearby OB associations (Caswell & Haynes 1987). Its location places it within the greater Vela Molecular Ridge, a region rich in molecular clouds and stellar nurseries (Murphy & May 1991).
Today, Gum 10 is mostly known to researchers and advanced astrophotographers targeting obscure nebulae in the southern Milky Way.
Key Facts
- Type: Emission nebula (H II region).
- Distance: ~2,500 light-years.
- Size: Several degrees across.
- Visibility: Faint, requiring narrowband imaging.
- Scientific importance: Part of the Carina–Vela star-forming complex.
References
Murphy, D. C., & May, J. (1991). The Vela Molecular Ridge. A&A, 247, 202.
Gum, C. S. (1955). A Survey of Southern H II Regions. Mem. RAS, 67, 155.
Caswell, J. L., & Haynes, R. F. (1987). Southern H II Regions. A&A, 171, 261.