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APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Thu Feb 23, 2012 5:07 am
by APOD Robot
Image A Zodiacal Skyscape

Explanation: Venus and Jupiter are this month's two brightest planets. Shortly after sunset on February 20, they dominate the sky above the western horizon and this snowy landscape. In clear and transparent skies over Cherry Springs State Park, Pennsylvania, USA, they are also seen immersed in Zodiacal light. The extended, diffuse, triangular glow is sunlight scattered by dust along the plane of the ecliptic. Brighter near the horizon, the Zodiacal glow angles upward, first to Venus and then to Jupiter hugging the ecliptic as they orbit the Sun. Fading even further, the glow stretches toward the lovely Pleiades star cluster near the top of the frame. Following their appearance in this Zodiacal skyscape, the coming days will see Venus and Jupiter sharing the early evening sky with a young crescent Moon. The two bright planets are even headed for a close pairing or conjunction, separated by about 3 degrees on March 13.

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Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Thu Feb 23, 2012 5:21 am
by peejaytee
Beautiful photo. Also note a faint streak (satelitte?) passing through Pleides.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Thu Feb 23, 2012 6:14 am
by chaitanya kulkarni
yes, I have also noted that faint line. what is that?

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Thu Feb 23, 2012 1:35 pm
by orin stepanek
Cool photo Jack! 8-) :D

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Thu Feb 23, 2012 2:06 pm
by Chris Peterson
chaitanya kulkarni wrote:yes, I have also noted that faint line. what is that?
Probably a satellite. The trail length looks reasonable for a 25-second exposure.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Thu Feb 23, 2012 2:36 pm
by Strangerbarry
Although I doubt you'd see it with the naked eye in the bright light cast by Venus, Uranus is also nearby (down a bit and to the right of Venus)

clear sky! (Re: APOD: A Zodiacal Skyscape (2012 Feb 23))

Posted: Thu Feb 23, 2012 5:38 pm
by Anthony Barreiro
Thanks for this beautiful photo. I've only rarely seen the zodiacal light, and never during twilight. The air must have been exceptionally clear. (Another reminder that even when we are looking out into space, we're still standing on planet Earth.)

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 12:40 am
by Craig Willford
I would presume that there have been studies of the spectrum reflecting back from the Zodiacal Dust to try to determine the size of the particles and maybe what the particles are made of. It would be fun to read about that. Perhaps a web search is in order. The "Cool Cosmos" hyperlink was interesting reading, but did not answer my question.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 12:58 am
by Craig Willford
An interesting paper addressing the source of Zodiacal Dust, and in part addressing my question about the size and makeup of the dust particles, is found at http://arxiv.org/ftp/arxiv/papers/0712/0712.2624.pdf Take a look at page 2 thereof, where they discuss some calculations of the size of dust particles if they are silicates and if they are water ice.

By the way, my last post prompted me, as the question to prevent spambots, to explain what the Asterisk is about. I sure didn't understand that one. Rearranging letters to form astronomy related words or phrases is easy by comparison.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 2:07 am
by jackfusco
Thank you everyone! I've said online already, but it's really an honor to have a second photo on APOD.That night in Cherry Springs was really incredible and I can't wait to go back. It made the 12 hours in the car well worth it. I wasn't positive if the trail near Pleiades was a meteor or from a satellite. I checked back on a few apps and didn't see anything show up for satellites that would be passing by at the time it was taken.

I think my next trip might actually be out to Spruce Knob in West Virginia. Has anyone here been there before? It's about an hour longer of a drive, but from what I hear it's a good deal better than even Cherry Springs.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 4:22 am
by TNT
Great job, Jack! And congratulations for your second APOD! :ssmile:

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 7:56 pm
by jackfusco
TNT wrote:Great job, Jack! And congratulations for your second APOD! :ssmile:
Thank you! Needless to say, I was very excited.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 8:19 pm
by biljofila
Hi I am interested if anyone posted picture of Mercur that is now possible to be seen in the east Europe. Tnx!

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 8:51 pm
by bystander
biljofila wrote:Hi I am interested if anyone posted picture of Mercur that is now possible to be seen in the east Europe. Tnx!
http://messenger.jhuapl.edu/gallery/sci ... llery_id=2

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Fri Feb 24, 2012 11:29 pm
by DavidLeodis
I've noticed that in the explanation it uses Pleides. I have also very occasionally seen that spelling elsewhere. I wonder therefore if Pleides is an accepted alternative spelling of the much more commonly used Pleiades. :?:

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 1:55 am
by geckzilla
I think it's just a common typographical error.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 10:40 am
by DavidLeodis
Cheers geckzilla. I thought that was what it might be but I did wonder. Pleiades is not an easy name to spell. :)

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 3:09 pm
by jackfusco
I've actually seen it spelled Pleiades more often than Pleiads. For what it's worth, the spell check on Chrome marks Pleiads incorrect.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 3:21 pm
by Chris Peterson
jackfusco wrote:I've actually seen it spelled Pleiades more often than Pleiads. For what it's worth, the spell check on Chrome marks Pleiads incorrect.
The question was with respect to the spelling "Pleides", which is simply incorrect.

The asterism is named for the mythical seven sisters, the Pleiades. Singularly, they are called "Pleiads", so that spelling is correct so long as you are referring to the individual sisters, or to individual stars, and not to the asterism itself.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 4:24 pm
by neufer
Click to play embedded YouTube video.
Chris Peterson wrote:
jackfusco wrote:
I've actually seen it spelled Pleiades more often than Pleiads. For what it's worth, the spell check on Chrome marks Pleiads incorrect.
The question was with respect to the spelling "Pleides", which is simply incorrect.

The asterism is named for the mythical seven sisters, the Pleiades. Singularly, they are called "Pleiads", so that spelling is correct so long as you are referring to the individual sisters, or to individual stars, and not to the asterism itself.

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 4:45 pm
by Beyond
Now wait a minute, a single star from the Pleiades is called a Pleiads? That seems to be plural to me. You sure a single star is not called a Pleiad? :?

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 4:54 pm
by Chris Peterson
Beyond wrote:Now wait a minute, a single star from the Pleiades is called a Pleiads? That seems to be plural to me. You sure a single star is not called a Pleiad? :?
Singularly they are called Pleiads. One is called a Pleiad. So the spelling "Pleiads" is correct for the case I gave- referring to the stars (plural).

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 5:03 pm
by neufer
Beyond wrote:
Now wait a minute, a single star from the Pleiades is called a Pleiads?
That seems to be plural to me. You sure a single star is not called a Pleiad? :?
http://en.wikipedia.org/wiki/Pleiades_in_folklore_and_literature wrote: <<The Lakota Tribe of North America had a legend that linked the origin of the Pleiades to Devils Tower. According to the Seris (of northwestern Mexico), these stars are seven women who are giving birth. The constellation is known as Cmaamc, which is apparently an archaic plural of the noun cmaam "woman".

In a Blackfoot legend, the Pleiades are orphans ("Lost Boys") :arrow:
that were not cared for by the people, so they became stars. Sun Man is angered by the mistreatment of the children and punishes the people with a drought, causing the buffalo to disappear, until the dogs, the only friends of the orphans, intercede on behalf of the people. Because the buffalo are not available while the Lost Boys are in the skies, the cosmical setting of the Pleaides was an assembly signal for Blackfoot hunter to travel to their hunting grounds to conduct the large-scale hunts, culminating in slaughters at buffalo jumps.

The Hopi built their underground kivas for multiple utilitarian uses, the most important of which was a ceremonial meeting place. Access was through a ladder in a small hole in the roof of the kiva, and during certain ceremonies, the night passage of the Pleiades over the center of the opening was a direct signal to begin a certain ceremony. Most of the cultures used the angle of the Pleiades in the night sky as a time telling device.

A Cheyenne myth "The Girl Who Married a Dog", states that the group of seven stars known as the Pleiades originated from seven puppies which a Cheyenne chief's daughter gave birth to after mysteriously being visited by a dog in human form to whom she vowed "Wherever you go, I go".

The Shasta people tell a story of the children of racoon killed by coyote avenging their father's death and then rising into the sky to form the Pleiades. The smallest star in the cluster is said to be coyote's youngest who aided the young racoons.

The Onondaga people's version of the story has lazy children who prefer to dance over their daily chores ingnoring the warnings of the Bright Shining Old Man. The Monache people tell of 6 wives who loved onions more than their husbands and now live happily in "sky country". The early Monte Alto Culture and others in Guatemala such as Ujuxte and Takalik Abaj, made its early observatories, using the Pleiades and Eta Draconis as reference, they were called the seven sisters, and thought to be their original land. In the ancient Andes, the Pleiades were associated with abundance, because they return to the Southern Hemisphere sky each year at harvest-time. In Quechua they are called collca' (storehouse). The ancient Aztecs of Mexico and Central America based their calendar upon the Pleiades. Their year began when priests first remarked the asterism heliacal rising in the east, immediately before the sun's dawn light obliterated the view of the stars. Aztecs called the Pleiades Tianquiztli (meaning "marketplace").>>

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 6:39 pm
by Beyond
Neufer, i would say that you have stretched Art about as far as Art can go, in the Asterisk*. :yes:

Re: APOD: A Zodiacal Skyscape (2012 Feb 23)

Posted: Sat Feb 25, 2012 6:50 pm
by Beyond
Chris Peterson wrote:
Beyond wrote:Now wait a minute, a single star from the Pleiades is called a Pleiads? That seems to be plural to me. You sure a single star is not called a Pleiad? :?
Singularly they are called Pleiads. One is called a Pleiad. So the spelling "Pleiads" is correct for the case I gave- referring to the stars (plural).
Ok, lets see if i got this right. Pleiades is the whole thing, of which the seven sisters are part. Each sister is a Pleiad. If you are referring to more than one sister at a time, then they are called Pleiads, because you are referring to more than one one. I-Pleiad + 1-Pleiad = 2-Pleiads.
Ok, it wasn't the math, it was the english.