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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.

The Constellation Serpens Caput, the ‘Snake’s Head’

July 16, 2016 by Brian Ventrudo Filed Under: Deep Sky

The region of Ophiuchus and Serpens in a map circa 1825.
The region of Ophiuchus and Serpens in a map circa 1825.

In last month’s constellation tour, we examined the dazzling stars of the constellation Corona Borealis, the Northern Crown. This month, we move due south to the northern section of the constellation Serpens, the only constellation split into two parts. These are the stars of Serpens Caput, the ‘head of the snake’, which zigzags vertically along the celestial sphere, just north of the celestial equator, and just west of the much larger constellation Ophiuchus, the ‘serpent bearer’. The stars of Serpens Caput are visible in the northern and southern hemispheres [Read more…] about The Constellation Serpens Caput, the ‘Snake’s Head’

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Filed Under: Deep Sky constellation, serpens, sky tour

The Constellation Corona Borealis

June 22, 2016 by Brian Ventrudo Filed Under: Deep Sky

Illustrated star map showing Corona Borealis and Hercules
Illustrated star map showing Corona Borealis and Hercules

Corona Borealis, or the Northern Crown, is a small but lovely semicircular constellation just to the east of Böotes, the Herdsman. In the months of May and June, shortly after sunset, the constellation lies nearly overhead for northern-hemisphere observers, and well over the northern horizon for southern stargazers. It’s one of the oldest constellations, and one of the few that vividly resembles its name.

The constellation takes its name from the crown, in Greek legend, given to the maiden Ariadne, the daughter of King Minos of Crete.  Ariadne had been abandoned on the island of Naxos by Theseus, the legendary hero who slew the Minotaur.  The god Dionysus rescued the maiden, fell in love with her, and gave her a jeweled crown forged by Hephaestus, god of the forge.  Ariadne and Dionysus had a happy life together.  But she was mortal and eventually died. Dionysus placed her crown in the heavens to remember her [Read more…] about The Constellation Corona Borealis

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Filed Under: Deep Sky constellation, corona borealis, sky tour

The Coma Cluster of Galaxies

June 10, 2016 by Brian Ventrudo Filed Under: Deep Sky

The brighter members of the Coma Cluster of Galaxies. The bright elliptical galaxy at left is NGC4889, and the bright elliptical at right is NGC 4874. The bright foreground star at upper right is HD 112887.
The brighter members of the Coma Cluster of Galaxies. The bright elliptical galaxy at left is NGC 4889, and the bright elliptical at right is NGC 4874. The bright foreground star at upper right is HD 112887.

Towards Coma Berenices, a tiny constellation between the handle of the Big Dipper and the haunches of the constellation Leo, the Lion, lies in a tiny expanse of sky an assembly of some of the most distant galaxies visible in a backyard telescope. These are the members of the Coma Cluster of Galaxies, a group of more than 1,000 big galaxies located so far away, their starlight left well before the first dinosaurs walked the Earth [Read more…] about The Coma Cluster of Galaxies

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Filed Under: Deep Sky coma berenices, dark matter, galaxies

New Supernova in Galaxy Messier 66

June 2, 2016 by Brian Ventrudo Filed Under: Deep Sky

A close-up of supernova ASASSN-16fq in the galaxy M66. Courtesy of Terry Hancock at Downunderobservatory.com.
A close-up of supernova ASASSN-16fq in the galaxy M66. Courtesy of Terry Hancock at Downunderobservatory.com.

An automated telescope on Haleakala in Hawaii spotted an exploding massive star in M66, a spiral galaxy in the constellation Leo. It appears to be a Type II supernova, the result of a massive star that has run out of fuel and suddenly collapsed and snapped back against the subatomic forces at play in its core. Like all supernovae, this star is blasting out nearly as much energy as all the other stars in the galaxy, albeit for just a few days [Read more…] about New Supernova in Galaxy Messier 66

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Filed Under: Deep Sky galaxies, supernova

Galaxy Tour: The Leo Triplet

April 14, 2016 by Brian Ventrudo Filed Under: Deep Sky

The Leo Triplet includes edge-on spiral galaxy NGC 3628 (below left), spiral galaxy M65 (top), and spiral galaxy M66 (below right). Image credit: Terry Hancock at Downunderobservatory.com
The Leo Triplet includes edge-on spiral galaxy NGC 3628 (below left), spiral galaxy M65 (top), and spiral galaxy M66 (below right). Image credit: Terry Hancock at Downunderobservatory.com

The constellation Leo is stuffed with galaxies that are visible in a backyard telescope. Three of the brightest and best known are M65, M66, and NGC 3628, also known as the “Leo Triplet”.  You can see all three galaxies in virtually any telescope and even in a good pair of binoculars. If you can see all three galaxies at once, keep in mind you’re seeing at one time the collected light of more than half a trillion stars [Read more…] about Galaxy Tour: The Leo Triplet

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Filed Under: Deep Sky galaxies, leo, sky tour

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