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APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 4:05 am
by APOD Robot
A 212-Hour Exposure of Orion
Explanation: The constellation of Orion is much more than three stars in a row. It is a direction in space that is
rich with impressive nebulas. To better appreciate this well-known swath of sky, an
extremely long exposure was taken over many clear nights in 2013 and 2014. After 212 hours of camera time and an
additional year of processing, the featured 1400-exposure collage spanning over 40 times the
angular diameter of
the Moon emerged. Of the many interesting details that have become visible, one that particularly draws the eye is
Barnard's Loop, the bright red circular filament arcing down from the middle. The Rosette Nebula is
not the giant red nebula near the top of the image -- that is a larger but lesser known nebula known as Lambda Orionis. The
Rosette Nebula is visible, though: it is the red and white nebula on the upper left. The bright orange star just above the frame center is
Betelgeuse, while the bright blue star on the lower right is
Rigel. Other famous nebulas visible include the
Witch Head Nebula, the
Flame Nebula, the
Fox Fur Nebula, and, if you know just where to look, the comparatively small
Horsehead Nebula. About those
famous three stars that cross the belt of
Orion the Hunter -- in this busy frame they can be hard to locate, but a discerning eye will find them just below and to the right of the image center.
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 7:02 am
by Ann
You haven't seen Orion until you have seen Stanislav Volskiy's portrait of Orion.
Just sayin'.
Ann
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 9:26 am
by Alex_515
What a gorgeous image !!!
Alex
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 9:36 am
by Alex_515
Looking the zoomed version of the image (which is really impressive...) I was wondering: take for instance Barnard's loop, you see many stars as white dot points in it. Are all these stars between us and Barnard's loop ? Or is it possible some stars are behind but we still can see them trough ?
I'm asking because it can help give a sense of depth seeing the image.
Alex.
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 11:13 am
by orin stepanek
I keep getting ( This site can't be reached! ) I hope it comes up soon!
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 11:56 am
by Ann
orin stepanek wrote: ↑Sun Mar 29, 2020 11:13 am
I keep getting ( This site can't be reached! ) I hope it comes up soon!
Orion (right) and Monoceros (left). Note the abundance
of background stars in Monoceros. Photo: Alan Dyer.
I can't access the APOD either, so let's post Stanslav Volskiy's image from another source than the APOD. By the way, you can look at a large (11 MB) version of Volskiy's image
here.
Alex asked if the stars that we see apparently peeking through Barnard's Loop are foreground or background stars, or if they are located right inside Barnard's Loop itself. I can't answer you, but if you scrutinize the large version of the image, you can see that the number of small stars differ in different parts of the image. One explanation is that in at least some of the areas where we see fewer stars (like, for example, to the right of Barnard's Loop), there is probably more dust that prevents us from seeing so many background stars.
This is a very deep image. We are going to see many stars that are bright and very distant, and many stars that are relatively faint and much more nearby.
You must bear in mind, too, that there are more Milky Way background stars on the left than on the right side of Stanislav Volskiy's image, because the band of the Milky Way passes through Monoceros, but hardly at all through Orion. So on the left side of the image, you are likely to see many distant Milky Way background stars, some of which may be thousands of light-years distant.
And it is possible that a non-negligent excess of background Milky Way outliers can be seen through Barnard's Loop, compared with how many background stars can be seen in the rest of Orion.
Ann
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 12:17 pm
by orin stepanek
Ann wrote: ↑Sun Mar 29, 2020 11:56 am
orin stepanek wrote: ↑Sun Mar 29, 2020 11:13 am
I keep getting ( This site can't be reached! ) I hope it comes up soon!
Orion and Monoceros.png
Orion (right) and Monoceros (left). Note the abundance
of background stars in Monoceros. Photo: Alan Dyer.
I can't access the APOD either, so let's post Stanslav Volskiy's image from another source than the APOD. By the way, you can look at a large (11 MB) version of Volskiy's image
here.
Alex asked if the stars that we see apparently peeking through Barnard's Loop are foreground or background stars, or if they are located right inside Barnard's Loop itself. I can't answer you, but if you scrutinize the large version of the image, you can see that the number of small stars differ in different parts of the image. One explanation is that in at least some of the areas where we see fewer stars (like, for example, to the right of Barnard's Loop), there is probably more dust that prevents us from seeing so many background stars.
This is a very deep image. We are going to see many stars that are bright and very distant, and many stars that are relatively faint and much more nearby.
You must bear in mind, too, that there are more Milky Way background stars on the left than on the right side of Stanislav Volskiy's image, because the band of the Milky Way passes through Monoceros, but hardly at all through Orion. So on the left side of the image, you are likely to see many distant Milky Way background stars, some of which may be thousands of light-years distant.
And it is possible that a non-negligent excess of background Milky Way outliers can be seen through Barnard's Loop, compared with how many background stars can be seen in the rest of Orion.
Ann
That I was able to get! I see I can't get any of the daily APOD's!
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 3:55 pm
by orin stepanek
Allright! Nice!
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Sun Mar 29, 2020 4:40 pm
by sillyworm 2
There is a podcast on youtube that describes the daily APODs.I found it when the APOD page would not come up earlier.
Re: APOD: A 212-Hour Exposure of Orion (2020 Mar 29)
Posted: Mon Mar 30, 2020 7:00 am
by felix_wegerer
Wow, what a fantastic image! 212 hours is crazy. :O
