Celestial hemisphere:  Southern  ·  Constellation: Aquarius (Aqr)  ·  Contains:  Helix nebula  ·  NGC 7293
Helix Nebula - HII compared to OIII, NeedMoreCoffee
Helix Nebula - HII compared to OIII
Powered byPixInsight

Helix Nebula - HII compared to OIII

Helix Nebula - HII compared to OIII, NeedMoreCoffee
Helix Nebula - HII compared to OIII
Powered byPixInsight

Helix Nebula - HII compared to OIII

Equipment

Loading...

Acquisition details

Loading...

Description

These are my narrowband images after calibration, registration and integration. Other than a screen stretch they are unprocessed.

I thought the difference in structure between the two channels was quite striking. The hydrogen extends much further and seems to exhibit turbulence. Perhaps this is consistent with oxygen being the heavier element (assuming the OIII channel really does represent oxygen). The OIII also shows radial streaks which are absent from the HII.

Comments

Sky plot

Sky plot

Histogram

Helix Nebula - HII compared to OIII, NeedMoreCoffee