The Sky in September

Cygnus the Swan

July 2002 : By Dave Huestis

Cygnus the Swan (also known as the Northern Cross), can be found in one of the richest star regions in the sky.

Some Bright Autumn Double Stars

October 2005 : By Glenn Chaple

Autumn is a season of promise for the stargazers. The nights are getting longer, the air clearer, and those pesky summer mosquitoes are a thing of the past. In a few months, Orion and his magnificent wintry retinue will take center stage. While the autumn night sky appears devoid of bright stars, it’s still home to a rich array of double stars. Here are ten of the best:

Some Bright Summer Double Stars

June 2005 : By Glenn Chaple

In this modern era of the huge galaxy-gulping Dobsonian reflector, double stars have become the neglected children of the cosmos. That’s too bad, because few heavenly objects have the visual appeal of double stars.

A Selection of Double Stars in Cygnus

October 2007 : By Glenn Chaple

Although it’s a Summer Triangle constellation, Cygnus remains well-seen throughout the autumn months. Located in the star-rich fields of the Milky Way, the Swan is home to numerous double stars. Here are eight of the most noteworthy (data from the Washington Double Star Catalog.

A Selection of Double Stars in Draco

July 2008 : By Glenn Chaple

A hazy summer evening may prevent you from observing nebulae and galaxies, but it could afford ideal seeing conditions for high power targets like double stars.

A Starhop Through Scutum

August 2008 : By Craig Cortis

The Wild Duck Cluster, M11 is one of the many highlights to be seen in and around the Scutum Star Cloud using binoculars and small telescopes.

A Selection of Double Stars in Andromeda

November 2008 : By Glenn Chaple

Andromeda is home to a fine collection of double stars. Here are eight of the best. Data on magnitudes and separation were taken from the Washington Double Star Catalog.

The Heart of our Milky Way Galaxy

August 2009 : By Craig Cortis

Now we come to the very best that summertime observing has to offer us: the areas around the actual center of our home Galaxy, the Milky Way.

β Cygni (Albireo)

October 2011 : By Glenn Chaple

I’m a big fan of “off-the-beaten-path” sky objects. One of my favorites is the little-known double star Struve 817 - the 817th double star catalogued by the German-born Russian astronomer F. G. W. Struve during a survey conducted between 1824 and 1827.

Mizar, The First Double Star

May 2009 : By Glenn Chaple

The middle star in the handle of the Big Dipper, Mizar is the easiest double star for the novice to locate. It boasts historical importance as the first double star discovered.

Chaple’s Arc

August 2009 : By Glenn Chaple

Forgive me for the apparent ego trip, but this month I’m going to introduce you to an amazing little asterism called “Chaple’s Arc.” I stumbled upon the Arc in the mid-1970s while looking for the double star h1470.

Epsilon Pegasi: The Pendulum Star

September 2009 : By Glenn Chaple

Epsilon Pegasi (Enif) is an optical double star comprised of magnitude 2.5 and 8.7 component stars separated by 144 seconds of arc. Pairs this wide usually don’t merit much consideration, but wait! Epsilon Pegasi has a surprise for us.

Cygnus X-1: A Black Hole You Can Find!

September 2009 : By Craig Cortis

Unusual celestial objects having bizarre or extreme astrophysical properties often make highly desirable observing targets for amateur astronomers wishing to find things outside the scope of the usual, customary star party “menu”. So how do you find something that even the Hubble Space Telescope can’t image in visible light? The answer is surprisingly simple and is my topic for this month.

Taking the Broad View: Skywatching with your Naked Eyes

November 2009 : By Craig Cortis

You are unnecessarily shortchanging yourself if you’ve come to believe that astronomy can only be enjoyed by viewing everything in the very limited confines of telescopes or binoculars.

Beta Persei (Algol, the "Demon Star")

November 2009 : By Glenn Chaple

Are you ready for the eclipse of November 13th? I’m not talking about the sun or moon. I’m referring instead to an eclipse of the fascinating star ß Persei (Algol).

NGC 7293: the Helix Nebula

October 2009 : By Glenn Chaple

NGC 7293, the Helix Nebula, is the nearest planetary nebula (distance ~ 450 LY) and largest in apparent size (12 by 16 arcminutes). Moreover, it’s a 7th magnitude object. An easy telescopic target? Hardly! The magnitudes listed for deep-sky objects are often misleading, and the Helix Nebula is a prime example.

The “Little Big Dipper”

September 2010 : By Jim Hendrickson

An asterism in Cepheus that is easy to find in small telescopes or binoculars is comprised of 10 stars between magnitude 6.0 and 9.5 and very closely approximates the shape of the northern sky’s most famous asterism-the Big Dipper

It’s Full of Stars!

June 2010 : By Dave Huestis

This month Dave Huestis examines the 5th largest constellation in the sky - Hercules. While there are many mythological stories about this giant, one of the most beautiful objects in the heavens resides within its borders. It's full of stars!

Corona Australis & the Southern Limits of Sagittarius

August 2010 : By Craig Cortis

I’ve written about this subject in past issues, but it occurs to me now that it might be of interest to mention just the few bright stars that lie way down near the southern border of Sagittarius, only a few degrees above our local horizon limit of -48° in declination. The small constellation of Corona Australis, known as the Southern Crown, lies just west of these stars and is a worthwhile section of sky for those who might wish to become better acquainted with the more southerly parts of the summer Milky Way as presented to our view in August.

A Star-Hop that Finally Worked!

September 2010 : By Craig Cortis

Craig Cortis describes an adventure in star-hopping to one of the lesser-known Messier objects, globular cluster M75 in Sagittarius.

The Milky Way

September 2010 : By Glenn Chaple

Many astronomers regard the Milky Way, viewed with the unaided eye on a dark, moonless night, as the most awe-inspiring heavenly sight of all. During late summer, it arches overhead, from Cassiopeia to our north, through Cygnus above, then down to Sagittarius on the southern horizon.

IC 4665

August 2010 : By Glenn Chaple

One reason for IC 4665’s relative anonymity is its large size, allowing it to elude the narrow fields of large-aperture telescopes. Charles Messier and William Herschel missed it, and it wasn’t included in the New General Catalogue. This often-overlooked cluster is definitely a must-see object for binoculars and rich-field telescopes.

Delta (δ) and Mu (μ) Cephei

October 2010 : By Glenn Chaple

In the southern part of Cepheus is a pair of naked eye variable stars worthy of note. The first, delta (?), is the prototypical Cepheid variable. It ranges between magnitudes 3.5 and 4.4 in a precise 5.37 day period. The rise from minimum to maximum brightness takes about 1½ days; the fade back to minimum involves an additional four.

Izar (ε Boötis)

June 2010 : By Glenn Chaple

A larger telescope and magnifying power of 200X will readily split Izar and reveal a striking color contrast between the golden yellow primary and its bluish companion. The Russian astronomer Wilhelm Struve, who conducted a double star survey in the late 1820s and early 1830s, nick-named it “Pulcherrima” (The Most Beautiful).

September Constellations & Folklore

September 2011 : By Francine Jackson

At this time of year, even though the season of summer ends this month and fall begins, the sky takes a little longer to shift to its next season. The Summer Triangle is still in a beautiful observing position, not really giving the fall constellations a chance to come to full view. So, while we’re waiting, it might be good to turn back to the north and see what is happening there.

NGC 457 (the “ET Cluster”)

December 2010 : By Glenn Chaple

Have you seen “ET” lately? Not that cute little alien in Steven Spielberg’s 1982 movie. I’m referring to the ET-mimicking open star cluster NGC 457 in Cassiopeia. Discovered by William Herschel in 1787, NGC 457 is often overlooked because of its proximity to the Messier cluster M103.

The Ships of Sheliak

September 2011 : By Jim Hendrickson

Hidden in the rich starfields near the Ring Nebula is an asterism that resembles a pair of ships from Star Wars.

M56: Globular Cluster in Lyra

September 2011 : By Glenn Chaple

In July, we looked at M92, a fine globular cluster in Hercules that’s overlooked in favor of the easier-to-find M13. The same misfortune has befallen another globular cluster - M56 in Lyra. M56 is often bypassed by backyard astronomers who favor the planetary nebula M57, conveniently positioned midway between the stars beta (β) and gamma (γ) Lyrae.

Observe Delta Cephei

December 2011 : By Gerry Dyck

Gerry Dyck introduces us to variable star observing with the naked eye star Delta Cephei.

Almach

November 2011 : By Glenn Chaple

Last month, I suggested that our featured object, Albireo, may not be the most beautiful double star in the sky and I’d introduce a rival this month. If you guessed that Albireo’s challenger is Almach, the gamma (?) star in Andromeda, you’d be correct!

M33: Galaxy in Triangulum

December 2011 : By Glenn Chaple

Consider the spiral galaxy M33 in Triangulum. Listed as a 6th magnitude object, it’s notoriously difficult to view in telescopes. M33 is elusive because its light is spread over an area four times that of the full moon.

Some Treasures of the Summer Milky Way From Perseus to Sagittarius

July 2013 : By Dave Huestis

On July evenings, from a sky not severely limited by light pollution, an observer will notice a milky patch of light well above the eastern horizon and spanning the sky from north to south. This is the light from some of the 400 billion stars of our Milky Way galaxy.

Fomalhaut

October 2014 : By Francine Jackson

A lone, bright star low in the south graces the early autumn evening sky.

M22: Globular Cluster in Sagittarius

August 2012 : By Glenn Chaple

What’s the most spectacular globular cluster in the northern sky? Most backyard astronomers would pick the Great Cluster M13 in Hercules. If you wish to view the finest globular cluster visible from the entire New England sky, however, you’ll have to travel south of the celestial equator to the constellation Sagittarius and its showpiece globular cluster M22.

Coathanger Asterism in Vulpecula

September 2012 : By Glenn Chaple

If you slowly scan the southern part of Vulpecula with binoculars or rich-field telescope, you’ll come across a remarkable asterism comprised of 10 stars arranged in the distinct form of a coathanger. Six line up to form the bar, while four others create the hook. It’s quite an eye-opening sight!

NGC 6934: Globular Cluster in Delphinus

October 2012 : By Glenn Chaple

October sees the demise of the summer Milky Way and its swarm of globular clusters centered on the constellation Sagittarius. A few, notably M15 in Pegasus, lag behind to grace our autumn skies. Another of these stragglers is NGC 6934 in Delphinus. This small 9th magnitude globular was discovered by William Herschel in 1785. In early star atlases and in modern-day “Herschel 400” guides, it bears the designation H1031 - the 103rd entry in Category I (bright nebulae) of Herschel’s deep sky catalog.

Struve 2816 and 2819: Triple and Double Stars in Cepheus

November 2012 : By Glenn Chaple

There’s something hypnotic about a double star – two gleaming points of light shining bravely through the surrounding darkness. A triple star is even more mesmerizing. Place a double star and triple star in the same eyepiece field, and the visual effect is stunning. This is what greets the eye when you view the triple/double star combo Struve 2816 and Struve 2819.

NGC 7662: the Blue Snowball

January 2013 : By Glenn Chaple

What could be a more appropriate telescopic destination for a wintry night in January than the “Blue Snowball?” More formally known as NGC 7662, the Blue Snowball is a beautiful planetary nebula located in Andromeda. Discovered by William Herschel in 1784, it sports as the nickname implies a circular form and eye-pleasing bluish hue.