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2026 September 30
The Complete Sharpless Catalog: 313 Nebulae
* Image Credit: Bing Xin
* Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)
https://kerockcliffe.com/Explanation:
What does it take to image hundreds of nebulae? Today’s image contains the entire Sharpless Catalog of H II Regions, totaling 313 objects. Zoom in and explore! You may spot fan favorites like the Eagle (Sh2-49), Heart (Sh2-190), and Orion (Sh2-281) Nebulae. Despite its name, this catalog contains more than the glow of ionized hydrogen that makes up H II regions. There are planetary nebulae (the Medusa Nebula, Sh2-274) and supernova remnants (the Spaghetti Nebula, Sh2-240) as well. Astrophotographer Bing Xin traversed the dark skies of Eastern China and Inner Mongolia to catch them all. Narrowband filters that strictly capture light from ionized hydrogen and oxygen or red-green-blue filters were used. Each object took 2 to 6 hours to capture. If the average was 4 hours, that is over 1000 hours to complete the catalog! Which object is your favorite?
https://articles.adsabs.harvard.edu/pdf/1959ApJS....4..257S
https://science.nasa.gov/image-article/apod-2026-june-10-the-eagle-nebula-and-friends/
https://science.nasa.gov/image-article/apod-2023-december-13-deep-field-the-heart-nebula/
https://science.nasa.gov/image-article/apod-2025-april-20-the-orion-nebula-in-visible-and-infrared/
http://spiff.rit.edu/classes/phys371/lectures/hii_i/hii_i.html
https://esahubble.org/wordbank/planetary-nebula/
https://science.nasa.gov/image-article/apod-2024-november-22-the-medusa-nebula/
https://imagine.gsfc.nasa.gov/science/objects/supernova_remnants.html
https://science.nasa.gov/image-article/apod-2026-january-7-simeis-147-the-spaghetti-nebula-supernova-remnant/
https://www.youtube.com/watch?v=MpaHR-V_R-o
https://www.astronomy.com/observing/using-filters/https://apod.nasa.gov/apod/ap260930.html
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