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NASA’s Astronomy Picture of the Day for October 2, 2026, presents a composite image of all 313 objects in the Sharpless Catalog of H II Regions. Astrophotographer Bing Xin says the project took about 800 hours, with each object requiring between two and six hours of imaging.
NASA’s Astronomy Picture of the Day on October 2, 2026, features an image containing all 313 objects in the Sharpless Catalog, a collection of nebulae and other astronomical objects. Astrophotographer Bing Xin assembled the project from observations made across Eastern China and Inner Mongolia, spending about 800 hours capturing the catalog’s objects.
The image brings together objects cataloged as Sharpless, or Sh2, including familiar nebulae such as the Eagle Nebula (Sh2-49), the Heart Nebula (Sh2-190) and the Orion Nebula (Sh2-281). NASA’s APOD description invites viewers to zoom in and explore the collection, rather than presenting it as a single exposure of the sky.
The catalog’s name reflects its focus on H II regions, clouds of ionized hydrogen, but the APOD notes that its contents are not limited to those objects. The selection also includes the Medusa Nebula (Sh2-274), described as a planetary nebula, and the Spaghetti Nebula (Sh2-240), a supernova remnant.
According to the NASA feature, Xin used narrowband filters that primarily capture light from ionized hydrogen and oxygen, along with red, green and blue filters. Each object took between two and six hours to capture; the full project took around 800 hours, according to the APOD description.
A Catalog Built From Hundreds of Exposures
The image offers a visual survey of a catalog that otherwise requires viewers to seek out its entries individually. By arranging 313 different objects in one presentation, it gives amateur astronomers and other readers a way to compare nebulae across a broad collection and spot well-known targets alongside less familiar ones.
The project also conveys the scale of work behind detailed astrophotography. The reported 800 hours of imaging were accumulated across hundreds of targets, with individual capture times varying from two to six hours. Those figures describe the time spent capturing the objects; the source does not provide a breakdown of processing time or explain how the final composite was assembled.
For readers, the image is both a gallery and an invitation to explore. NASA highlights that the catalog includes multiple kinds of objects, so the collection should not be read as 313 identical examples of glowing hydrogen clouds. Its varied entries make the catalog a broader showcase of nebulae and related structures visible in the targeted collection.
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What the Sharpless Catalog Includes
The Sharpless Catalog is commonly identified by the prefix Sh2. As its title indicates, it is associated with H II regions, where hydrogen gas has been ionized. NASA’s APOD description cautions that the catalog’s contents extend beyond that category, naming both a planetary nebula and a supernova remnant among its examples.
The October 2 feature is part of NASA’s Astronomy Picture of the Day, a daily service that pairs an image or photograph of the universe with an explanation. NASA says each entry is accompanied by a brief explanation written by a professional astronomer. The page credits the image to Bing Xin and lists Keighley Rockcliffe, Robert Nemiroff, Jerry Bonnell and Cecilia Chirenti as authors and editors.
Xin’s project drew on observations from dark skies in Eastern China and Inner Mongolia, according to the APOD. The page identifies the filters used and the time spent on the targets, but it does not describe the exact equipment, dates of individual observations or the technical method used to combine the images.
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Details Behind the Composite Remain Sparse
The APOD provides the project’s reported total and per-object capture times, but does not give a full technical account of how the 313 images were processed, calibrated or arranged into the final presentation. It also does not specify when the observations were made or how many separate nights and locations contributed to the finished image.
The description says narrowband and red-green-blue filters were used, but offers no detailed equipment list or exposure settings. It does not explain whether every catalog entry is shown at the same scale, or how the objects’ positions and relative sizes are represented in the layout. The image is presented as a way to explore the collection, not as a uniform scale comparison.
The source attributes the project to astrophotographer Bing Xin and credits the APOD authors and editors, but provides no interview or separate statement from Xin about the project’s choices or challenges. The reported 800 hours should therefore be treated as the figure given in NASA’s feature; further information about what the total includes is not supplied.
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Explore the Featured Sky Survey
NASA’s APOD page encourages readers to zoom in on the image and explore the catalog’s entries, including the Eagle, Heart and Orion nebulae. The next step for readers is to view the original image and its accompanying explanation, where the objects can be examined in greater detail than a brief article allows.
The source does not announce a follow-up release, additional observations or a planned technical breakdown of the project. NASA’s APOD is a daily feature; the page lists the following day’s picture as “just Curiosity.” Any further information about Xin’s methods or the composite would depend on a separate publication or statement.
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Key Questions
What does the October 2, 2026, APOD show?
It features an image containing all 313 objects in the Sharpless Catalog of H II Regions, assembled by astrophotographer Bing Xin.
How long did the project take?
NASA’s description says each object took two to six hours to capture and the catalog project took around 800 hours overall. It does not give a separate total for image processing.
Are all 313 objects H II regions?
Not according to the APOD description. It says the catalog includes more than H II regions, citing the Medusa Nebula as a planetary nebula and the Spaghetti Nebula as a supernova remnant.
Where were the images captured?
The APOD says Xin worked under dark skies in Eastern China and Inner Mongolia. It does not identify the specific sites or dates of the observations.
What filters did Bing Xin use?
NASA says the project used narrowband filters that primarily capture light from ionized hydrogen and oxygen, as well as red, green and blue filters. The page does not list specific equipment or exposure settings.
Source: primary
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