When is the best time to observe Caldwell 6?

Caldwell 6 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is Caldwell 6 located in the sky?

Caldwell 6 lies in the constellation Draco at right ascension 17h 59m and declination +66° 38′.

What telescope do I need to see Caldwell 6?

At magnitude 8.1, Caldwell 6 is within reach of a 3-inch (80 mm) telescope from a moderate-Bortle site.

Caldwell 6 — Planetary Nebula in Draco

NGC 6543

Planetary Nebula Excellent (64/100)

Magnitude 8.1^m PlanetaryNebula Draco Visible

Credit: J.P. Harrington and K.J. Borkowski (University of Maryland), and NASA. License: Public domain. (Wikimedia Commons)

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About Cat's Eye Nebula

Description

The Cat's Eye Nebula (NGC 6543) is one of the most structurally complex planetary nebulae known, located about 3,300 light-years away in Draco. Its bright inner shell spans only about 20 arcseconds, surrounded by a faint outer halo of earlier ejected material.

Observing Tips

Easy to find near the north ecliptic pole in Draco. Visible in small telescopes as a blue-green fuzzy star. A 6-inch scope reveals its disk shape. The 11th magnitude central star is visible at higher magnifications. Observable year-round from northern latitudes.

History

Discovered by William Herschel on February 15, 1786. It was the first planetary nebula studied spectroscopically by William Huggins in 1864, who proved it was composed of gas rather than unresolved stars — a pivotal moment in astrophysics.

Fun Facts

Hubble Space Telescope images revealed an extraordinarily complex system of jets, knots, bubbles, and arcs. The central star is a binary whose orbital motion may be responsible for the intricate structure.