# Orion Nebula multiband 2x2 mosaic - HOO

- By: Brainandforce
- Date: 2026-04-03
- Classification: Photograph
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Orion_Nebula_multiband_2x2_mosaic_-_HOO.jpg)
- Rights: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0)
- Picture: https://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Orion_Nebula_multiband_2x2_mosaic_-_HOO.jpg/1920px-Orion_Nebula_multiband_2x2_mosaic_-_HOO.jpg
- Who can see it: Kids profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

This multiband study of the Orion Nebula covered the near infrared, red, green, and blue bands along with H-alpha and \[O III\] emission. This image was assembled by combining H-alpha data in the red image channel with \[O III\] data in the green and blue image channels. In the resulting HOO palette, emission from gases ionized by the stars of the Orion Nebula dominates the picture, with \[O III\] emission only present in the hottest parts of the nebula ionized by the Trapezium.

However, some continuum sources manage to leak through: stars are still visible in the image, and some of the nebulosity captured by the \[O III\] channel is actually reflection nebulosity. Because Rayleigh scattering, the process which illuminates reflection nebulae, preferentially scatters shorter wavelengths of light, more reflection nebulosity leaks through the \[O III\] filter than the H-alpha filter.

Mount: Sky-Watcher Wave 150i (strain wave German equatorial mount)

Telescope: Apertura CarbonStar RC8 (Ritchey–Chrétien telescope, 203 mm aperture, 1624 mm focal length, no reducer or flattener)

Camera: Touptek ATR533M (Sony IMX533 monochrome sensor)

Filters:

SVBONY 685 nm NIR (red channel) (555×15s)…