Community Lists

The Astronomical League's Double Star Observing Program features 100 of the finest double and multiple star systems in the heavens. The list progresses through the sky by right ascension, offering a year-round tour of colorful pairs, challenging splits, and famous multiple systems. Any telescope 60mm or larger can complete the program. Stars range from wide naked-eye pairs to tight sub-3" challenges requiring steady seeing.

The Herschel 400 is a list of 400 deep-sky objects selected by the Astronomical League from William Herschel's original catalog of discoveries. All are NGC objects, spanning galaxies, open clusters, globular clusters, planetary nebulae, and diffuse nebulae. Designed as the natural next challenge after the Messier catalog, requiring 6-8 inch aperture and moderately dark skies for most targets. Sorted by right ascension for a natural sky tour through the seasons.

A curated selection of 50 astronomical objects that remain rewarding targets even under heavy light pollution (Bortle 7–9). The list emphasizes double stars and variable stars (immune to light pollution), compact star clusters, high-surface-brightness planetary nebulae, and only the brightest deep-sky objects. All targets are visible from mid-northern latitudes (Dec > −20°). Arranged by category, from light-pollution-proof to more challenging.

A curated selection of fourteen rewarding variable stars visible from the northern hemisphere. This list spans every major type of variability — eclipsing binaries, pulsating Cepheids, long-period Mira types, eruptive Be stars, and semi-regular giants — chosen for naked-eye or binocular visibility, dramatic brightness changes, and historical significance. Each star tells a different story about stellar physics and offers a hands-on introduction to variable star observing.

A curated selection of the finest planetary nebulae visible from northern latitudes (Dec > -20°). These dying stars showcase an extraordinary variety of shapes and colors, from perfect smoke rings to glowing spheres. An OIII or UHC filter dramatically improves the view for most of these objects. Sorted by brightness for progressive challenge.

Twenty overlooked but genuinely rewarding NGC and IC objects for 4-6 inch telescopes from northern latitudes. These lesser-known treasures rival the famous Messier objects in visual appeal but rarely appear on beginner lists. The selection spans open clusters, galaxies, and planetary nebulae, covering all four seasons and offering rich variety for observers ready to venture beyond the Messier catalog.

A curated selection of 20 showpiece deep-sky objects and double stars ideal for 10x50 binoculars from northern latitudes. These targets are bright enough to stand out in handheld optics, large enough to fill the wide field of view, and span all four seasons. From glittering star clusters to glowing nebulae and nearby galaxies, each object reveals something special through modest glass.

A curated selection of the finest carbon stars for visual observation. These deep-red gems are among the most colorful objects in the sky, best appreciated through binoculars or a small telescope.

The 25 brightest globular clusters in the sky, ranging from magnitude 3.9 to 7.9. These ancient stellar cities — each containing hundreds of thousands to millions of stars — are among the most rewarding deep-sky objects for any telescope. From the naked-eye brilliance of Omega Centauri to the subtle glow of M107, this list covers the finest globulars visible from mid-northern latitudes, with a few spectacular southern showpieces included.

A curated selection of 25 showpiece double stars observable with small refractors (≤100mm aperture) from the northern hemisphere. Chosen for color contrast, easy resolvability, and visual beauty.

A year-round tour of the finest open star clusters visible from the northern hemisphere, ordered by right ascension so they trace the seasons from autumn through summer. Open clusters are among the most rewarding telescopic objects — from the naked-eye splendor of the Pleiades to the dense swarm of the Wild Duck Cluster, each has its own character. This list spans the full range: young and old, sparse and rich, binocular and telescopic, including several that contain hidden treasures like planetary nebulae or dramatic asterisms.