Best practice for developing ...
Posted: Sat Jan 05, 2019 5:16 pm
... spectra images
Hi,
First a Happy New 2019 and lots fof clear sky
Now I am retired from my day job and I found aout that 24/7 is not enough for this Astronomy hobby. Also having installed better mounts with which I am very satisfied finally I can go troublefree for exposures times of 15 and 30 minutes for a single image. Also the pointing is much better then before.
Long time no active in Spectrographing and now a University here in Mexico approached me to make some images of Hot stars for them like HD 14947, HD 15570, HD 16691 and many others.
I have a LISA at f/5.6 on a AT 8" RC telescope. Originally the scope if f/8.0 and I am using a 0.7x reducer from Optec Inc.
Yesterday I made some test images from the HD 14947 using 120, 300 and 900 seconds exposure times, 10 and 7 images each, and now I would like to know what is the best practice for stacking these images. The imaging session was very interesting the star seemed to be nailed onto the slit ( Sorry I do not remember the slit width but so far I never turned it since getting the LISA) Is it the 23micron one ?
I have MaxIM DL as well as PixInsight for processidn the images. In Maxim there are five alternatives but so far I only have seen 2 known ways in PixInsight which are Average and Median and still do not understand what Maximum and Minimum is in PixInsight.
Should I use Sum in MaxIM DL or what is best ?
Of course I made Dark and Bias frame. Is it mandatory to use a Flat image too ?
One more question. How do I know the resolution after developing the spectrum ? I normally use RSpec for the spectrum analysis. I really never did understand Vspec enough and RSpec is very intuitive and easy to work with.
I also made some images using the Neon lamp insige the LISA and now I will ahve to learn how to calibrate my LISA again using that images. The middle line of the 5 H-alpha lines is exactly at 1167 pixels where it should be as the calculation in the manual.
Thanks very much in advance for any tips and regards
Rainer
PD on the attached image you can see LISA in the back scope as well as how my equipment looks now
Hi,
First a Happy New 2019 and lots fof clear sky
Now I am retired from my day job and I found aout that 24/7 is not enough for this Astronomy hobby. Also having installed better mounts with which I am very satisfied finally I can go troublefree for exposures times of 15 and 30 minutes for a single image. Also the pointing is much better then before.
Long time no active in Spectrographing and now a University here in Mexico approached me to make some images of Hot stars for them like HD 14947, HD 15570, HD 16691 and many others.
I have a LISA at f/5.6 on a AT 8" RC telescope. Originally the scope if f/8.0 and I am using a 0.7x reducer from Optec Inc.
Yesterday I made some test images from the HD 14947 using 120, 300 and 900 seconds exposure times, 10 and 7 images each, and now I would like to know what is the best practice for stacking these images. The imaging session was very interesting the star seemed to be nailed onto the slit ( Sorry I do not remember the slit width but so far I never turned it since getting the LISA) Is it the 23micron one ?
I have MaxIM DL as well as PixInsight for processidn the images. In Maxim there are five alternatives but so far I only have seen 2 known ways in PixInsight which are Average and Median and still do not understand what Maximum and Minimum is in PixInsight.
Should I use Sum in MaxIM DL or what is best ?
Of course I made Dark and Bias frame. Is it mandatory to use a Flat image too ?
One more question. How do I know the resolution after developing the spectrum ? I normally use RSpec for the spectrum analysis. I really never did understand Vspec enough and RSpec is very intuitive and easy to work with.
I also made some images using the Neon lamp insige the LISA and now I will ahve to learn how to calibrate my LISA again using that images. The middle line of the 5 H-alpha lines is exactly at 1167 pixels where it should be as the calculation in the manual.
Thanks very much in advance for any tips and regards
Rainer
PD on the attached image you can see LISA in the back scope as well as how my equipment looks now