An introduction to Deep Sky Objects

Photographs from Dog-Star Observatory, Cape Haze, FL, organized by object type. Each category contains original and annotated versions of the images.

The originals are on the left, the annotated, and possibly ai enhanced version on the right, and the descriptive text are generated by GPT.

My pictures are taken with a Seester 550 from Dog-Star Observatory in Cape Haze, Florida. Bortle is usually 6 but occasionally gets down to 4. I do not use any gereative AI on my pictures, but honestly my goal is pretty pictures.

This started out as play and evolved into a tool with which I hope to teach my grandkids. Please feel free to share it.

For the amateur astronomer, there are basically two broad types of objects: (1) Objects within our Soolar System, and (2) objects outside of our solar system. We call those deep sky objects. I have 5 categies here.

Galactic

Star clusters and other objects within our Milky Way galaxy.

Galaxy

Galaxies beyond the Milky Way, from nearby spirals to distant island universes.

Globular Clusters

Ancient, densely packed spherical star clusters orbiting the Milky Way.

Nebulae

Interstellar clouds of gas and dust, including emission, reflection, and star-forming regions.

Planetary Nebulae

Glowing shells of gas associated with stellar evolution, along with selected stellar remnants.

Copyright G.M. Santoro, PhD, 2026

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