Northern Sky Narrowband Survey

This category contains results from the Northern Sky Narrowband Survey, which began at the end of 2018. The focus of this project is on the emission lines of HII (656.3 nm), OIII (500.7 nm), and SII (671.7 nm and 673.0 nm), but continuum data are also collected. The entire northern sky down to a declination of -16° is being surveyed.

A brief description of the equipment can be found on the instruments page. Almost any of the images produced by the survey show faint nebulae that haven't been cataloged before (which does not mean they are unknown). An attempt to list these objects can be found on the Uncataloged objects page.

Data releases

Follow the links for full release documentations.
DR0.1 (October 2024)
Complete set of Hα and continuum data

Images

Below are some results produced from the latest data release. Click on the preview images to see a larger version with a description.

Milky Way from Perseus to Monoceros: Orion-Eridanus Superbubble and dense molecular clouds Milky Way from Perseus to Monoceros:
Orion-Eridanus Superbubble and dense molecular clouds Nebulae above the galactic plane High galactic latitude nebulae around celestial north pole Milky Way from Cygnus to Perseus Milky Way from Cygnus to Perseus:
Many prominent HII regions Nebulae below the galactic plane Nebulae below the galactic plane Milky Way from Serpens Cauda to Cygnus: A region full of supernova remnants Milky Way from Aquila to Cygnus:
A region full of supernova remnants Dense region of the Milky Way near Aquila Hundertwasser-Corner:
Nebulae that appear to be created using a ruler Dense region of the Milky Way near Aquila Milky Way from Scutum to Aquila:
Star fields behind dark nebulae SH2-27 (Zeta Ophiuchi Nebula) behind molecular clouds SH2-27 (ζ Ophiuchi Nebula) behind molecular clouds

Images from before the first data release

Below are older results created from early data. These images were processed differently than the newer ones. In particular, no continuum subtraction was applied. Click on the preview images to view larger versions with detailed descriptions.

OIII arc in Gemini OIII arc in Gemini Milky from Perseus to Cassiopeia Milky from Perseus to Cassiopeia Milky Way in Cassiopeia and Cepheus Milky Way in Cassiopeia and Cepheus HII region around California Nebula (NGC 1499) HII region around California Nebula (NGC 1499) Milky Way in Cygnus Milky Way in Cygnus Milky Way from Vulpecula to Aquila Milky Way from Vulpecula to Aquila Milky Way from Scutum to Ophiuchus Milky Way from Scutum to Ophiuchus Orion region Orion region Milky Way from Taurus to Perseus Milky Way from Taurus to Perseus M33 to SH2-126 M33 to SH2-126 Milky Way from Monoceros to Gemini Milky Way from Monoceros to Gemini

Monitor calibration

For optimal display, the monitor should be calibrated so that as many shades of the grayscale shown below are distinguishable. At least the 4% steps should be separated by every monitor. The 2% steps are visible on better monitors. To distinguish the 1% steps, a HDR monitor is required.

gray scale

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