by Chris Peterson » Thu Aug 18, 2022 1:03 pm
XgeoX wrote: ↑Thu Aug 18, 2022 10:35 am
This whole image is vexing. I dialed up the time and location in Sky Safari and Stellarium and nothing adds up.
First off the shower radiant is separated by a good 100+ degrees in azimuth from the moon and is also higher in the sky. What appears to be the Pleiades shouldn’t be there it should be way over to the left of the castle out of the image. Going by the Moon and Saturn there is only one star cluster there and that is a globular one m30 and the cluster on the image is obviously an open cluster.
Maybe I am missing something obvious or I just don’t know what I am doing with the programs but something is missing.
Can any body post an illustration putting this image in relation to a wider sky shot because I am stumped! :(
This image was made from hours of data. The only way you can do that when there's a full Moon is to cut out the individual meteors from each image that captured one before you stack them, and then composite those with one or more images capturing the Moon, the tower, maybe some stars. And depending on how you isolate the meteors, you may leave stars in those exposures, as well (for instance, if you cut out the area around the Moon instead of tightly cutting out the meteor). So it makes perfect sense that there is no clear star pattern to be seen, just a few individual recognizable asterisms, the positions of which can't be compared because they were captured at different times. The bright object to the right of the Moon is quite properly placed to be Saturn (Jupiter was clear over on the other side of the Moon at the time), and it makes sense it was captured in the same exposure that captured the Moon.
[quote=XgeoX post_id=325187 time=1660818929 user_id=145282]
This whole image is vexing. I dialed up the time and location in Sky Safari and Stellarium and nothing adds up.
First off the shower radiant is separated by a good 100+ degrees in azimuth from the moon and is also higher in the sky. What appears to be the Pleiades shouldn’t be there it should be way over to the left of the castle out of the image. Going by the Moon and Saturn there is only one star cluster there and that is a globular one m30 and the cluster on the image is obviously an open cluster.
Maybe I am missing something obvious or I just don’t know what I am doing with the programs but something is missing.
Can any body post an illustration putting this image in relation to a wider sky shot because I am stumped! :(
[/quote]
This image was made from hours of data. The only way you can do that when there's a full Moon is to cut out the individual meteors from each image that captured one before you stack them, and then composite those with one or more images capturing the Moon, the tower, maybe some stars. And depending on how you isolate the meteors, you may leave stars in those exposures, as well (for instance, if you cut out the area around the Moon instead of tightly cutting out the meteor). So it makes perfect sense that there is no clear star pattern to be seen, just a few individual recognizable asterisms, the positions of which can't be compared because they were captured at different times. The bright object to the right of the Moon is quite properly placed to be Saturn (Jupiter was clear over on the other side of the Moon at the time), and it makes sense it was captured in the same exposure that captured the Moon.