Black Canyon Astronomical Society

The BCAS offers programs and presentations on all facets of astronomy to public organizations, schools (elementary through college) and home-school groups.  We have many experienced observers and astrophotographers and can assist newcomers with selection, operation and maintenance of all varieties of optical equipment for astronomical use. 

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WESTERN SLOPE SKIES
7:00 am
Fri July 3, 2015

Western Slope Skies: New Horizons at Pluto

Credit National Aeronautics and Space Administration

On February 18th, 1930, a 24-year-old Kansas farmhand-turned-astronomer made a discovery that forever changed our understanding of the Solar System. On that evening, Clyde Tombaugh, who had grown up on family farms in Illinois and Kansas, discovered Pluto. Tombaugh’s discovery nearly doubled the size of the known solar system overnight.

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WESTERN SLOPE SKIES
7:00 am
Fri June 5, 2015

Western Slope Skies: Astronomy at Black Canyon of the Gunnison National Park

Spring is quickly shifting into summer. For us at Black Canyon of the Gunnison National Park, this means that the busiest visitation days of the year are just around the corner. Folks from all over the world will soon fill the visitor center, planning adventures into the canyon and asking about park wildlife. Rangers will begin presenting geology walks along the rim and talks out at Chasm View. It’s an exciting time of year in the park.

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WESTERN SLOPE SKIES
7:00 am
Fri May 22, 2015

Western Slope Skies: Women in Astronomy

Women in Astronomy – Sydney Wolff

This is a continuing series on Women in Astronomy.  Today we meet Sidney Wolff.

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WESTERN SLOPE SKIES
7:00 am
Fri April 24, 2015

Western Slope Skies: Seeing Double in Perseus

You may know the Greek myth of Perseus, a young hero who slew the petrifying Medusa and the sea monster Cetus, in order to rescue the beautiful Andromeda from her cruel mother Cassiopeia.  The ancient Greeks saw fit to immortalize the story in the sky, by tracing constellations resembling these characters. We recognize these constellations today-- in particular, Andromeda with its legendary naked-eye galaxy M31, our closest spiral galactic neighbor.

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WESTERN SLOPE SKIES
7:00 am
Fri April 10, 2015

Western Slope Skies - Star Light, Planet Bright

The Pleiades
Credit Hubble Space Telescope - NASA

The winter evening sky was dominated by two exceptionally bright “stars” that are actually planets — resplendent Venus, nearest of planetary neighbors, in the west, and regal Jupiter, largest of the planets, in the east. As we enter spring, Venus and Jupiter remain celestial highlights, and will treat us to a special double-feature in mid-April — each planet will be very close to a prominent open star cluster.

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WESTERN SLOPE SKIES
7:00 am
Fri March 27, 2015

Western Slope Skies - Lunar Eclipse at Dawn

If you rise early on Saturday, April 4 you will be treated to an unusual event:  the third of four total lunar eclipses occurring within a period of just two years.  This has been called a lunar eclipse tetrad. 

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WESTERN SLOPE SKIES
7:00 am
Fri March 13, 2015

Western Slope Skies - Ursa Major

Black Canyon of the Gunnison National Park, near Montrose, CO, is an excellent place to observe night skies free from light pollution. When it comes to constellations, one of the most famous is Ursa Major, meaning “The Big Bear,” which includes “The Big Dipper.”

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WESTERN SLOPE SKIES
10:44 am
Fri February 27, 2015

Western Slope Skies - Solar System Exploration in 2015

2015 is a banner year for solar system exploration.  Although the European Venus Express Mission and NASA’s Messenger Mission to Mercury are ending, other missions will be gearing up in 2015.  NASA’s New Horizons probe will fly by Pluto in July, and in March, another NASA probe, called Dawn, will enter orbit around Ceres, the l

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WESTERN SLOPE SKIES
7:00 am
Fri February 13, 2015

Western Slope Skies - Venus Meets Mars and the Moon

Venus, Mars, and a thin crescent Moon will create a stunning sight in our early evening sky on February 20.  If skies are clear, find an open spot with an unobstructed horizon and look to the west between 6:15 and 7:00 p.m.   At first you may see brilliant Venus next to a thin, crescent Moon.  As twilight fades, fainter Mars will appear between Venus and the Moon.  Use binoculars for a truly amazing view!        

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WESTERN SLOPE SKIES
7:00 am
Fri January 30, 2015

Western Slope Skies - The Dance of the Galilean Moons

As twilight ends this winter, look to the east. You may see a very bright “star” that does not twinkle. This is Jupiter, the largest planet of the Solar System, eleven times the diameter of the Earth.

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WESTERN SLOPE SKIES
7:00 am
Fri January 16, 2015

Western Slope Skies - The Color of Stars

For astronomers, it’s not all black and white…

At first glance, our night skies can appear as a dark canvas illuminated with points of mono-hued light.  But, as your eyes adapt, and on closer inspection, one can pick out stars with colors that are blue, white, gold, and reddish orange.

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WESTERN SLOPE SKIES
7:00 am
Fri January 2, 2015

Western Slope Skies - Brightness of the Moon

The Moon is very bright during the first week of January, and it’s tempting to go for a snow shoe trek or ski tour by moonlight.  But two weeks ago, the moon was hardly visible at all.  There is one main factor that determines the visibility and brightness of the moon:  lunar phase. But, varying Earth-Moon distance also plays a role.

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WESTERN SLOPE SKIES
7:00 am
Fri December 19, 2014

Western Slope Skies - Women In Astronomy

This is an ongoing series on Women in Astronomy.  Today, we meet three modern women in astronomy, Jocelyn Bell Burnell, Andrea Ghez, and Carolyn Porco.

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WESTERN SLOPE SKIES
7:00 am
Fri December 5, 2014

Western Slope Skies - December Solstice

The December solstice is coming!  At 4:03 p.m. Mountain Standard Time on December 21st, the Sun reaches its most distant point south in 2014, as viewed from Earth.  This defines the December solstice, which is the shortest day in the Northern Hemisphere and the longest day in the Southern Hemisphere. 

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WESTERN SLOPE SKIES
7:00 am
Fri November 21, 2014

Western Slope Skies - 11/21/14

The Stars of Autumn

With fewer hours of sunlight during autumn the nights grow longer and there is a distinct chill in the air after the sun sets. You may notice the sky appears darker and the stars just a little clearer. A star chart or an astronomy app for a phone or tablet will guide you to the fall constellations and many of the stars visible in our skies.

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WESTERN SLOPE SKIES
7:00 am
Fri November 7, 2014

Western Slope Skies - 11/7/14

November’s Meteor Shower

The November Leonid meteor shower has produced some of the greatest meteor storms in history.     

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WESTERN SLOPE SKIES
7:00 am
Fri October 24, 2014

Western Slope Skies - 10/24/14

The Milky Way
Air Dates: October 24 & 29, 2014

On these late October evenings, you may see a hazy band of light stretching from the southwestern horizon and crossing overhead to the northeast.  This is the Milky Way, an object of great wonder throughout human existence.

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WESTERN SLOPE SKIES
7:00 am
Fri October 10, 2014

Western Slope Skies - 10/10/14

October 23 Solar Eclipse

On October 8 we were treated to a total eclipse of the moon, and on October 23 North American sky-watchers can experience a partial solar eclipse. 

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WESTERN SLOPE SKIES
7:00 am
Fri September 26, 2014

Western Slope Skies - 9/26/14

Pre-Dawn Lunar Eclipse

The second total lunar eclipse of 2014 will occur in the pre-dawn hours of Wednesday, October 8th. Nearly the entire eclipse will be visible from Western Colorado.

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WESTERN SLOPE SKIES
7:00 am
Fri September 12, 2014

Western Slope Skies - 9/12/14

Binary Stars

Next time you see the Big Dipper out of the corner of your eye, take a look at the star in the middle of the handle. If you have decent eyesight, you may see not one, but two stars: a brighter star known as Mizar, and a fainter star called Alcor. 

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WESTERN SLOPE SKIES
7:00 am
Fri August 29, 2014

Western Slope Skies - 8/29/14

Neptune

"BORING!" said the 5-year-old of the little blue dot appearing through the telescope…

Perhaps at first glance, but considering that Neptune, the 8th planet,  is 30 times farther from the Sun than Earth, it’s actually an amazing sight. At approximately 2.8 billion miles away, it cannot be observed with the un-aided eye.  Seeing the disk and color requires a moderately sized telescope, and a keen-eyed astronomy buff.

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WESTERN SLOPE SKIES
7:00 am
Fri August 15, 2014

Western Slope Skies - 8/15/14

Planetary Conjunctions

Late August will be a great time for planet watching, in the morning and the evening. If you are up early on Monday, August 18, you will be rewarded by a spectacular pre-dawn sight. 

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WESTERN SLOPE SKIES
7:00 am
Fri August 1, 2014

Western Slope Skies - 8/1/14

The Tidal Dance of the Earth and the Moon

We learn in grade school that the Moon, our nearest neighbor in space, causes tides on the Earth’s oceans. It does so through its gravitational attraction to the Earth. But the gravitation interplay between Earth and Moon has other, subtler effects as well.

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WESTERN SLOPE SKIES
11:52 am
Fri July 18, 2014

Western Slope Skies - 7/18/14

The Evening Sky in Late July

The Sun sets late on these long summer days, and it’s not fully dark until almost 10 PM.  And, because of this week’s late-rising moon, the sky remains dark long after twilight, allowing us great views of the Milky Way and the stars of summer.

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WESTERN SLOPE SKIES
12:50 pm
Fri July 4, 2014

Western Slope Skies - 7/4/14

Pluto a planet?  Not a planet?  Beloved Disney Dog?

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WESTERN SLOPE SKIES
12:43 pm
Fri June 20, 2014

Western Slope Skies - 6/20/14

June Solstice

With the arrival of warmer temperatures, perhaps you’ve been enjoying some outings to the mountains or a float trip on a river.  While there is no doubt that summer is in full swing here in western Colorado, it’s not until this coming Saturday that the Universe makes it official. 

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WESTERN SLOPE SKIES
10:08 am
Tue June 10, 2014

Western Slope Skies - 6/6/14

Light Pollution

Those of us that live on the Western Slope are no stranger to spectacular scenery. The jagged peaks, chiseled canyons, and expansive plateaus of western Colorado are treasures that we all cherish. But one of our most spectacular natural wonders may also be one of our least appreciated: our incredibly dark and pristine night skies.

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WESTERN SLOPE SKIES
12:51 pm
Fri May 23, 2014

Western Slope Skies - 5/23/14

Mercury in Evening Twilight
 

Have you ever seen the planet Mercury? When conditions are near optimal, Mercury is easy to see. However, optimal conditions are rare, and many casual observers search for Mercury without success. This is because of the planet’s proximity to the sun.  The safe time to view Mercury is after sunset or before sunrise, depending upon the Mercury's orbit.

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WESTERN SLOPE SKIES
7:00 am
Fri April 25, 2014

Western Slope Skies - 4/25/14

Navigating the Night Sky

The Big Dipper is a great starting point for learning the night sky. Located near the pole of the sky, it never completely sets or dips below the horizon—it’s visible in the night sky year-round from the Western Slope! 

The Big Dipper itself is not a constellation, but it resides in one called Ursa Major, the Great Bear, third largest of the 88 constellations. The name originates from the dipper-shaped pattern formed by the seven main stars in the constellation.

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WESTERN SLOPE SKIES
7:00 am
Fri April 11, 2014

Western Slope Skies - 4/11/14

April’s Total Lunar Eclipse

Late on the evening of April 14th and into the early morning hours of April 15th, skygazers throughout the America’s and much of the Pacific region will be treated to a total lunar eclipse. This eclipse will be the first of two for the year. By the time the sun, earth and moon line up it will have been 857 days or 28 months since we last saw our moon completely in the shadow of our planet.

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