About Visual AstronomyCustom Telescope ModsTips & TricksNewsObservationsRSS FeedContact

Tuesday, September 2, 2008

Constellation Showcase: Cygnus


Welcome to this month's Constellation Showcase! This monthly segment details a currently viewable constellation, typically somewhere along the ecliptic. This month we're making a departure from the ecliptic and up the Milky Way to bring you this month's Constellation Showcase: Cygnus! Like last month's feature Sagittarius, Cygnus lies within the Milky Way, so it is chock full of targets for your backyard telescope! This time of year (August-September), it is almost directly overhead at 10PM to 12AM local time. This makes it very easy to find. Cygnus is shaped somewhat like a cross, as can be seen in the picture to the right (Courtesy of Stellarium). If you follow the short arms of the cross outward, you will see that they form wing-like appendages. This is where Cygnus the swan gets its namesake.

Cygnus is known to most people as a swan, although it is sometimes also called The Northern Cross. The constellation's origin, like many others is placed in Greek mythology. In one such myth, the king Cycnus was related to Phaethon, son of Apollo. Apollo unwittingly allowed Phaethon to take the controls of the sun chariot. Zeus is outraged at this, and sends Phaethon crashing into the river Eridanus. Cycnus desperately tries to retrieve Phaethon from the river, but fails. In diving repeatedly into the river, Cycnus is transformed into the swan we see today.

Nebulae


Cygnus is home to quite a few impressive and famous nebulae. One of these, NGC 7000, is commonly known as the North American Nebula. It is called this because of its apparent resemblance to the continent of North America, in modest telescopes. In the picture to the left, you can see the resemblance very well (Image courtesy of Oliver Stein). The North American Nebula is very large. If you were to put it next to the full moon, the moon would be dwarfed! The North American Nebula is about ten times the apparent size of the full moon. The reason you can't see the North American Nebula with your naked eye is that the nebula is very dim, and requires a telescope to gather enough light to see it. No one knows which star(s) are contributing to this emission nebula's glow, but if we assume it is Deneb, we can infer that the nebula is approximately 1800 light years away and 100 light years across.

The Pelican Nebula can be seen very near the North American Nebula. Like its nearby neighbor, the Pelican Nebula is thought to be about 1800 light years distant, and is closely associated with its neighbor.

One of the most famous nebulae, the Veil Nebula, calls Cygnus home. The Veil Nebula, also known as the Cygnus Loop is a beautiful sight, provided you have the equipment to see it. At right, you can see an amazing image of the Veil Nebula taken by the Palomar Observatory (Courtesy of Palomar Observatory/STScI/WikiSky). Of course, the view in a home telescope won't come anywhere near this image, and can actually be quite difficult to see. Using an oxygen-III filter helps significantly in seeing this nebula. This filter only allows light near the oxygen-III emission lines, and works great on the Veil because most of its light is emitted in this spectrum. The nebula itself was formed from the remnants of a massive supernova explosion. It is thought that the original source of the supernova exploded about 5000 years ago. The nebula we see now is a shockwave of sorts, expanding into deep space.

Other Objects


Cygnus X-1, which resides in the constellation Cygnus is the one of the strongest known x-ray radiation sources visible from Earth. It is now believed that Cygnus X-1 is indeed a black hole. Cygnus X-1 is composed of a very high-mass binary system, with a star feeding material into the black hole's accretion disk.

The most interesting star in Cygnus to look at with a telescope is the binary star β Cygni, also known as Albireo. Albireo is so interesting because of the colors of its component stars. The picture to the left closely approximates the colors visible through most decent telescopes (Courtesy of Hunter Wilson). Even a cheap telescope will show good color between the two stars. Albireo A is the brighter orange star, and Albireo B is the dimmer blue star. The color of the stars is slightly exaggerated by the human eye, due to their close proximity and vast difference in color. This makes Albireo an excellent target for any telescope, and any astronomer (beginner or expert). Sometimes even the view through your finderscope will show significant color in this binary star. Albireo can be located in the diagram of Cygnus seen at the top of this page.

I hope you enjoyed this month's installment of the Constellation Showcase, and that you will join us next month, when we will showcase another constellation!

To receive more articles like this, subscribe via RSS Feed or e-mail!

Clear skies!

Previous Constellation Showcase - Sagittarius
Next Constellation Showcase - Aquarius

30 comments:

张栋 said...

tods shoes
ugg boots
oakley sunglasses
burberry outlet,burberry outlet online,burberry outlet store,burberry factory outlet,burberry sale,burberry
arizona cardinals jerseys
celine outlet online
fred perry polo shirts
michael kors outlet
lebron james shoes
kobe shoes
oakley sunglasses
tory burch outlet
new york jets jerseys
oklahoma city thunder jerseys
ralph lauren polo shirts
lululemon outlet
nike air max uk
vans shoes
abercrombie
abercrombie and fitch
cheap oakley sunglasses
hollister, http://www.hollistercanada.com
cheap ugg boots, http://www.cheapuggboots.net.co
cheap soccer jerseys
oakley sunglasses
tiffany and co
tiffany and co jewelry
ray ban sunglasses, http://www.ray-bansunglassess.in.net
ysl outlet

Jianbin Jianbin said...

jianbin1111
michael kors handbags clearance
true religion outlet,true religion jeans,true religion kids,true religion jeans sale,true religion jeans for men,true religion jacket,true religion sale
michael kors online outlet
louboutin uk
michael kors handbags wholesale
mlb jerseys wholesale
dallas cowboys
michael kors outlet,michael kors outlet online,michael kors,kors outlet,michael kors handbags,michael kors outlet online sale,michael kors handbags clearance,michael kors purses,michaelkors.com,michael kors bags,michael kors shoes,michaelkors,cheap michael kors
michael kors outlet
ugg boots on sale
barbour clothing
cheap uggs
new york knicks
replica handbags
nfl jerseys wholesale
nike free run uk
roshe run women
cheap nfl jerseys
san francisco 49ers
wedding dresses
los angeles clippers
air jordan shoes
pittsburgh steelers
uggs on sale
toms outlet
nike running shoes
chanel handbags
football shirts uk,soccer jerseys uk,cheap soccer jerseys uk
michael kors handbags,michael kors outlet,michael kors outlet online,michael kors,kors outlet,michael kors outlet online sale,michael kors handbags clearance,michael kors purses,michaelkors.com,michael kors bags,michael kors shoes,michaelkors,cheap michael kors
michael kors outlet

dong dong23 said...

louis vuitton outlet
coach outlet
oakley store
oakley sunglasses
christian louboutin sale
cheap oakleys
kevin durant shoes
replica watches
longchamp handbags
north face outlet
kevin durant shoes 8
louis vuitton outlet
coach factory outlet
oakley vault
cheap jordans
hollister clothing
ray ban outlet
oakley sunglasses wholesale
michael kors outlet clearance
tiffany outlet
michael kors outlet
ralph lauren polo
michael kors outlet
kate spade outlet
cheap oakley sunglasses
polo ralph lauren
fitflops sale clearance
coach outlet
ray ban sunglasses
michael kors outlet
nike free run 2
cartier watches
coach outlet
jordan 8
hollister clothing store
nike trainers
toms shoes
ray ban outlet
toms
michael kors outlet
20164.9wengdongdong

Yuanyuan Lin said...

7.14lllllyuan"tiffany and co"
"michael kors outlet"
"hollister uk"
"michael kors outlet"
"salomon shoes sale"
"ralph lauren outlet"
"bottega veneta outlet online"
"fred perry polo"
"true religion jeans"
"michael kors outlet"
"camisetas futbol baratas"
"cartier outlet store"
"hollister"
"christian louboutin shoes"
"nike soccer shoes"
"polo ralph lauren"
"polo ralph lauren"
"michael kors outlet"
"longchamp handbags"
"fitflops sale"
"michael kors outlet"
"coach outlet online"
"louis vuitton handbags outlet"
"adidas shoes"
"tory burch shoes"
"chrome hearts eyewear"
"tory burch outlet"
"michael kors outlet"
"replica watches"
"burberry sunglasses on sale"
"louis vuitton bags"
"coach outlet"
"jordan shoes 2015"
"michael kors outlet"
"abercrombie outlet"
7.14

Zheng junxai5 said...

zhengjx20160715
louis vuitton outlet online
ralph lauren home
michael kors handbags
adidas superstar
coach factory outlet
coach outlet
longchamp le pliage
gucci outlet
oakley sunglasses wholesale
ray ban sunglasses
michael kors handbags
jordan 3 retro
louis vuitton outlet online
true religion jeans
nike trainers sale
burberry outlet online
cheap jordans
michael kors outlet online
christian louboutin sale clearance
louis vuitton outlet stores
coach outlet store online clearances
replica watches
supra for sale
cheap air jordans
coach outlet
coach outlet
michael kors outlet online
nike running shoes for men
michael kors outlet clearance
michael kors outlet
oakley sunglasses
nike free 5.0
burberry handbags
cheap jordans
louis vuitton handbags
hollister clothing store
louboutin shoes
polo ralph lauren
michael kors outlet clearance

Ahl Lawda said...

Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats

Ahl Lawda said...

Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats

Ahl Lawda said...

Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats

Ahl Lawda said...

Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats

Ahl Lawda said...

Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats

Ahl Lawda said...

Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats
Clash Royale Cheats

Ahl Lawda said...

Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems

Ahl Lawda said...

Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems

Ahl Lawda said...

Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems

Ahl Lawda said...

Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems

Ahl Lawda said...

Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems
Clash Royale free gems

Unknown said...

We are really grateful for your blog post. You will find a lot of approaches after visiting your post. Great work.
Call Girls in Delhi

Aapki Saheli said...

Hello
Recantaly I read Your Blog About Your Topic Very Good Post You Share With Us Your Post Very Useful Informative For me and also Other readers, Thanks For Sharing.


Devayani Kaor
Minni Sharma
Roshni Khanna in Gurgaon
Roshni Khanna in Delhi
Yami Sharma

Rudy Lay said...

Super website with a great sharing and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bola Resmi

Bandar bola

Agen Bola Terpercaya

Agen Bola Terbesar

Agen Bola online

Judi bola

Berita Bola

Agen Sbobet

Agen Ibcbet

Unknown said...

wow, what a amazing post it contain all the thing i need for my work like tips , suggestion , queries thanks to you blogger for putting this on site
Escorts in Delhi

Rudy Lay said...

Super website with a great sharing and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bola Resmi

Bandar bola

Agen Bola Terpercaya

Agen Bola Terbesar

Agen Bola online

Judi bola

Berita Bola

Agen Sbobet

Agen Ibcbet

Rudy Lay said...

Super website with a great sha and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bandarq

Agen Domino99

Domino Online

Agen Poker

Bandar Domino99

Rudy Lay said...

Super website with a great sha and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bandarq

Agen Domino99

Domino Online

Agen Poker

Bandar Domino99

Rudy Lay said...

Super website with a great sha and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bandarq
Agen Domino99
Domino Online
Agen Poker
Bandar Domino99

Rudy Lay said...

Super website with a great sharing and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Togel Online Singapore
Togel Online Hongkong
Bandar Togel Singapore
Bandar Togel
Togel Online Terpercaya
Bandar Togel Online Terpercaya
Togel Online
Agen Togel Online Terpercaya
Agen Togel Online
agen togel
agen togel indonesia
togel sgp
daftar togel online
Togel Online terbesar
bandar Togel Online

Kame Hame Ha said...

Thanks for your post! it contains quite a lot of things to learn! it's great that I known this site!

cinemaindo
layarkaca21
DAFTARPOKER
BandarQ
BandarPoker
Bandar Kiu
Agen QQ

Meiqing Xu said...

cheap air max
chaussure louboutin pas cher
nike air huarache
adidas superstar
ugg canada
ed hardy clothing
kate spade bags
louis vuitton handbags
ugg australia outlet
hejixa20161217

james martin said...

Yahoo customer support number
Yahoo customer support number
Yahoo customer support number
Yahoo customer support number
Yahoo customer support number
Yahoo customer support number
Yahoo customer support number
Yahoo customer support number

Kavya Arora said...

gurgaon call girls
Gurgaon Escorts
Gurgaon Escort Services
Gurgaon Independent Escorts
Independent Escorts in Gurgaon
Female Escorts in Gurgaon
Escorts services Gurgaon
Call girls in Gurgaon
Independent Gurgaon Call Girls

chenlina said...

ray ban sunglasses
timberland boots
abercrombie kids
pittsburgh steelers jerseys
michael kors outlet
burberry outlet
christian louboutin uk
toms wedges
ed hardy clothing
coach factory outlet
chenlina20170307

Post a Comment