Window mode follows your eyes with your camera, in this browser only: no picture or position leaves your device.
Northern Sky Narrowband Survey - H-alpha and Continuum
2025-10-06
- Classification
- Photograph
- Museum
- Wikimedia Commons
- Rights
- CC BY-SA 4.0, as the museum states it.
- Who can see it
- Kids profiles and older: it shows nature, places, still life or a children's book. How works are placed
About this work
212° stereographic projection of the entire region surveyed by the Northern Sky Narrowband Survey showing hydrogen emissions and continuum light. Ionized hydrogen (Hα at 656.3 nm, without continuum) is mapped to red, blue continuum (including some [OIII] and Hβ emissions) is mapped to green, and red continuum (without Hα but with some [SII] emissions) is mapped to blue. Emission nebulae appear reddish while reflection nebulae are green to blue. Stars are partially subtracted in order to make the faint nebulae visible. The view was composed of 531,620 single exposures with a total exposure time of approximately 8,111 hours.
Emission nebulae (red) are concentrated near the galactic plane, extending from the left to the right side. Reflection nebulae (cyan), in the form of Integrated Flux Nebula, are also found at higher galactic latitudes. The cyan double ring is the ecliptic.
Other color composites of the same view
Emission lines [OIII], Hα, and [SII]
Hα in pseudo-colors
Continuum without Hα and with partially subtracted stars
True colors without subtraction of stars and emission lines
