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For the second time this month the calibration lines have shift on the chip between sessions overnight.
I installed a roll off roof last fall and never touched the Lhires tuned to Ha until late this spring when I would do an occasional HeI at 6678. I noticed that the movement of chips across the ...

Robin,

Where is the "PSF" in ISIS. I don't see anything like that.

Al Stiewing

2019-10-06.png I couldn't leave well enough Alone.
After weeks of trying I have the resolution back where it belong , but the spectrum is almost at the very bottom of image. As you can see from the attached it does not line up well with the calibration lines. Camera is an Atik 460 EX.
The picture ...

My Atik 460EX is not performing properly. I am considering the Starlight Express SX694 as a replacement primary because of it's superior cooling as I live in the desert,
My biggest concern is the "Dry Argon CCD chamber fill for improved cooling performance". Will the argon interfere with the ...

I had added 43 Ori to my to do list after seeing it needed attention in the BE database. Unfortunately, I did not get to it until last night and was quit surprised by the results. I need a little help in explaining what I am seeing. At this point I'm not sure I was on the right star as I could not ...

Before Submitting data to the Be database I check and adjust the wavelength using water as my benchmark, ensuring that the Ha region is spot on. I have noticed that at both ends of the spectrum a shift remains. I at first thought maybe the pixel size in ISIS might need adjusting, but have not seen a ...

I have mirrored all my data and reprocessed. Comments welcomed.

Ernst and Oliver,
Thanks. I mirrored 1 neon and 1 vv ceph and got the expected results using 3 line calibration even though the 6506.52 line was at pixel 3. I assume if I mirror all the images the results will be acceptable?
I see two action items at this point
rotate the camera 180 degrees
adjust ...

I recently purchased a new Lhires III mounted on a C-11. vv Ceph is my 1st target. Unprocessed the data looks good, but I am getting unexpected results. I had except to see the Ha line fall somewhere within the double hump. Instead it fell outside and to the right using the predefined mode 2400 ...