| Our Constellation
Report is an easy way for people to
become familiar with the nighttime sky. We’ll discuss myths associated
with a particular constellation as well as describing the numerous deep
sky objects residing within its boundaries. No equipment is required to view the
constellations, though a star chart can be quite helpful. This ease of
observing makes constellations a natural place to begin your journey to
the stars.
This weekend we move on to the constellation Vulpecula
the Fox.
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Deep Sky Report
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The focus of our efforts this week will be the deep sky objects of Vulpecula.
Vulpecula is
located between the constellations Cygnus and Sagitta. To find
Vulpecula, simply face towards the south after dark and look overhead. Vulpecula
is the constellation due south of the beautiful double star, Albireo
in Cygnus.
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To
begin, let's check out one of my favorite deep sky objects - Planetary
Nebula M27 - The Dumbbell
Nebula(mag7.6). M27 is located about 3° due north of Gamma
Sagitta. This large planetary nebula spans about 1/4° - roughly half
the diameter of the full moon. Once you figure out it's location, M27
should be an easy target in anything larger that 10x50 binoculars. In
larger aperture instruments, the Dumbbell is awesome. When I'm sweeping
towards the Dumbbell, I am always startled as it explodes into view. M27
is believed to be about 815 light years away, making it one of the closer
planetary nebulas. Astronomers estimate that around 48,000 years ago, the
gaseous material which makes up the nebula was cast away from it's central
star in several colossal events. The nebula is actually made up of two
shells, each expanding at different rates.
This
awesome shot was taken by former Utah Skies Astrophotographer
of the Month, Al Kelly.
On
a more modest note, this image taken by Don Brown of Utah Skies in May of
2003 show's what one can achieve with the combination of many short
exposures. Fourteen 3-minute exposures were combined as taken through a
4" refractor using an STV digital astro camera.
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Next up is
Bright Nebula NGC6820. This beautiful shot also includes NGC 6823
and 6830. Click
here for more beautiful images.
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Next up is
Open Star Cluster NGC6830(mag8.5). Located almost due west of M27. This small open cluster
is made up of about 20 stars to mag 11. Given the number of stars in this
area, you may have trouble spotting it.
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Next up is
Open Star Cluster NGC6885(mag6). Located about 4°
north of M27, this cluster is home to about 35 stars ranging from mag 6 to
mag 11 including the bright star in the center of the image 20
Vulpecula. Estimates place this cluster about 1900 light years distant.
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We'll wrap up our journey through
Vulpecula with a visit to this weeks Utah Skies Challenge Object, Open
Star Cluster NGC6940(mag 6.4). Located about 4.5°
northeast of NGC6885, this rich open cluster is made up of roughly 100
stars to mag 9. NGC6940 has a diameter about the size of the full moon
(31'), and is approximately 2600 light years away.
Good Luck!
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