Abell 35

Constellation: Hydra

Abell 35 (a.k.a Sh2-312) is a nebula in the constellation of Hydra. It is located approx. 400 Ly away. The nebula is characterised by a central bow shock surrounded by symmetric emission. In the centre of the nebula is a binary star, composed of a fast-rotating subgiant G8 III–IV star and a DAO white dwarf (strong absorption of Hα and He II) with a temperature of 80’000 °K; its mass is to low (0.48 M☉) to form a planetary nebula. So, while Abell 35 is commonly referred to as a planetary nebula, it has been suggested that the nebula wasn’t created by a post-AGB star shedding its outer shells but that it is interstellar medium ionised by the binary system, leading also to the creation of the bow shock. Link to interactive sky chart.

Telescope & Mount:

Planewave CDK24 on a Planewave L600 mount.

Imaging:

Camera: Moravian C3-61000 (bin 2×2)

Data:
Astrodon Ha: 20x1200s
Astrodon OIII: 29x1200s
Astrodon R: 6x600s
Astrodon G: 6x600s
Astrodon B: 7x600s

Total integration time: 19h 30′