Deep Sky Observing

Articles about how to understand, find, and see celestial objects including stars, galaxies, nebulae, and star clusters with binoculars, telescopes, and the naked eye.

Contemplating the “Harp Star”

October 17, 2021 by Brian Ventrudo Filed Under: Deep Sky

Vega, the brightest star in the constellation Lyra.

“Out on the lawn I lie in bed, Vega conspicuous overhead…” -W.H. Auden

I see plenty of stars in my line of work, and I’ve yet to see one I don’t like. But if had to choose a favorite, it would be the dazzling star Vega, the jewel of the tiny constellation Lyra, the Lyre. Intensely bright and blue-white in color, Vega conjurs memories of pleasant summer evenings spent stargazing and offers astronomers a remote stellar laboratory to help understand how stars evolve [Read more…] about Contemplating the “Harp Star”

Share This:

The Crescent Nebula

September 17, 2021 by Brian Ventrudo Filed Under: Deep Sky

Of the many deep-sky sights in the constellation Cygnus along the rich band of the northern Milky Way, the Crescent Nebula (NGC 6888) isn’t the biggest or brightest, but it still finds its place on the target list of many astrophotographers and visual observers. This shimmering and intricate arc of glowing gas presents a rare example of a massive star in its end stages as it ejects mass at a furious rate on its way to a violent demise as a supernova.

[Read more…] about The Crescent Nebula

Share This:

The Elephant Trunk Nebula

August 25, 2021 by Brian Ventrudo Filed Under: Deep Sky

The nebula IC1396, embedded star cluster Trumpler 37, and red supergiant star Mu Cephei (at extreme right). The nebula gets its power from the star HD206267 near the center of this image. The tip of the Elephant Trunk Nebula lies just below and left of center.

Cepheus, the King, is an ancient and rather dim constellation, but its position along the northern Milky Way means it harbors more than its share of deep-sky sights including star clusters, nebulae, even the lovely Fireworks galaxy (NGC 6946). But the best field of view in the constellation encompasses three deep-sky sights including a star-forming nebula, star cluster, and an aging red supergiant that’s one of the reddest and most luminous stars in the sky [Read more…] about The Elephant Trunk Nebula

Share This:

Runaway Stars

April 30, 2021 by Brian Ventrudo Filed Under: Deep Sky

The runaway star AE Aurigae, above and right of center, embedded in the Flaming Star Nebula (IC 405) in the constellation Auriga.

The Flaming Star Nebula (IC405) ranks as one of the showpiece sights in the northern constellation Auriga. This glowing emission nebula gains its energy from the star AE Aurigae, a 6^th-magnitude massive blue-white star about 1,500 light years away. This brilliant star, which outshines our Sun by some 30,000 times, blasts out ultraviolet light that ionizes the cloud of hydrogen gas around the star. As the hydrogen atoms reassemble, they emit light at signature wavelengths of red and green light that make these nebulae so beautiful. Most such nebulae are energized by stars that formed within their densest and most opaque regions. But that’s not the case with the Flaming Star Nebula. AE Aurigae did not originate here; it’s just passing by chance through a cold cloud of hydrogen as it hurtles through the Milky Way, far removed from the place it was born [Read more…] about Runaway Stars

Share This:

The ‘Intergalactic Wanderer’

March 24, 2021 by Brian Ventrudo Filed Under: Deep Sky

Conjured by Johann Hevelius in the late renaissance, the dim, linear constellation Lynx fills in the space between the much larger constellations Gemini, Auriga, and Ursa Major, just out of the plane of the northern Milky Way. While it doesn’t much resemble its namesake and contains no bright stars, Lynx harbors one of our galaxy’s most distant outliers, the famous ‘Intergalactic Wanderer’ (NGC 2419), a globular cluster that roams the desolate expanse between the Milky Way and the Andromeda Galaxy [Read more…] about The ‘Intergalactic Wanderer’

Share This: