#77

GHOST OF SATURN (CALDWELL 55)

BEAUTY: BRAGGING RIGHTS: A beautiful sight

HOW EASY IS IT TO SEE? Best with a high-power telescope

BEST TIME TO SEE IT: Fall (in Aquarius)

TYPE: Planetary Nebula DISCOVERED: 1782 by William Herschel

Complex structure. This beautiful planetary nebula is known as the “Ghost of Saturn” because it has a glowing bar across its equator, which resembles Saturn’s rings when seen edge-on. Unfortunately, such detail is invisible in most backyard telescopes (though a skilled astrophotographer can capture it). To find this ghost, look about 1½ degrees west (to the right) of Nu Aquarii (see chart).

Another eye? Instead of a Saturn-like scene, you’ll see is something resembling the Cat’s Eye Nebula: a bright central star surrounded by a faint oval ring of nebulosity. If steady skies allow it, use high magnification (×100 or more) to see detail in this tiny nebula. The nebula appears no larger than the planet Saturn, so you’ll need significant magnification.