|
Jeff,
A good clean spectrum!
The plate scale of 1.755 A/pixel is pretty close, but I think the focusing is better towards the green than the red. This shows up with the different resolutions ie @5882 it's about 5.3A, and @6503 it's 15.7A Could be the capabilities of the camera lens. Try another image with the same grating setting and re-focus towards the red... see if it's better.
You could also rotate the grating a bit more and bring the 6503A line into the centre of the frame.. see if the resolution changes.
The lines at 6382.99 and 6402.25 are 19.26 A apart so this gives a feel for the possible resolution....
Also I think with the pixel size you have it's under sampled, hence the blocky line profile- a smaller pixel size would be nicer.
BTW your neon shows the line at 5881.89A much stronger than the reference spectrum I have - interesting..
You're almost there! Time to get some practise with guiding on the stars.
(Think about adding a backlight red LED for the slit... it helps!)
|