by Ann » 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 (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
[quote="orin stepanek" post_id=300721 time=1585480387 user_id=100812]
I keep getting ( This site can't be reached! ) I hope it comes up soon!😭
[/quote]
[float=left][img3="A 212-Hour Exposure of the Orion constellation. Photo: Stanislav Volskiy."]https://external-preview.redd.it/s5u-F34UCZpd6HTVcO3CDQHTWNoozeeOgWO4mCJ4lOs.jpg?width=960&crop=smart&auto=webp&s=48051591cfeccefe4cf42e81fbd654bd6bdfed4c[/img3][/float] [float=right][attachment=0]Orion and Monoceros.png[/attachment][c][size=85]Orion (right) and Monoceros (left). Note the abundance
of background stars in Monoceros. Photo: Alan Dyer.[/size][/c][/float]
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 [url=https://external-preview.redd.it/s5u-F34UCZpd6HTVcO3CDQHTWNoozeeOgWO4mCJ4lOs.jpg?auto=webp&s=1046b5fed5e17d74e98bd04fdcc5a15f24e9b959]here[/url].
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