AM5 guided, Edge8, ASI2600MC-Pro with Clear filter
IC 239
- IC239_Handles_Edge8_15F_900S_11042026m2.jpg (934.54 KiB) Viewed 67 times
Star Handles - v4.2.15363.0
Star Handles - v4.2.15363.0
This was a first for me and I'm not sure what happened. All the other images from this EAA session were fine. Guiding was fine and nothing unusual stood out other than the handles on the bright stars of this live stack.
AM5 guided, Edge8, ASI2600MC-Pro with Clear filter
IC 239 The txt file for this stack is also attached.
AM5 guided, Edge8, ASI2600MC-Pro with Clear filter
IC 239 The txt file for this stack is also attached.
- Attachments
-
- Stack_15frames_900s.CameraSettings.txt
- (5.22 KiB) Downloaded 1 time
-
admin
- Site Admin
- Posts: 17544
- Joined: Sat Feb 11, 2017 3:52 pm
- Location: Vale of the White Horse, UK
- Contact:
Re: Star Handles - v4.2.15363.0
Hi,
my guess is one bad frame with the telescope knocked or bumped or glitched tracking at some point during the frame.
If the movement lasted maybe 1-2s during the 60s frame then it wouldn't really show up either in the stack or the raw frame image until you start stretching the image. The stretch boosts the dim pixels much more than the bright ones and therefore pulls the line drawn by the movement up from the background and makes it visible.
I don't know if something like that would even show up easily in the FWHM measurement - if there is movement consistently over a frame then obviously you would get noticeable trailing, but if the movement is a short part of a long frame then 95% or more of the light will be where it should be - only a tiny amount in the trail...
cheers,
Robin
my guess is one bad frame with the telescope knocked or bumped or glitched tracking at some point during the frame.
If the movement lasted maybe 1-2s during the 60s frame then it wouldn't really show up either in the stack or the raw frame image until you start stretching the image. The stretch boosts the dim pixels much more than the bright ones and therefore pulls the line drawn by the movement up from the background and makes it visible.
I don't know if something like that would even show up easily in the FWHM measurement - if there is movement consistently over a frame then obviously you would get noticeable trailing, but if the movement is a short part of a long frame then 95% or more of the light will be where it should be - only a tiny amount in the trail...
cheers,
Robin