2. Moon distance
The plot below shows sky counts/pixel above bias versus the Moon distance,
at the wavelength 5000 Å with the Moon illumination of 98%.
A target acquision is still quite easy at 9 degrees away from the nearly
full Moon, but gets very difficult at 4 degrees away from the nearly full
Moon.
3. Acceptable wavelength ranges
The idea of this test is to check the range of Angstroms you can move the central wavelength
of the original setup, for the setup to be still acceptable. This test is useful in situations
when observers want to change the central wavelength during the night or in cases when there
are little lines in a configuration and you have to move the central wavelength to be able to
perform the setup. The following tests have been performed:
| Date |
CCD |
Grating |
Central Wavelength |
Acceptable range |
Note |
| 20171129 |
Red+2 |
H1800V |
6400 |
± 700 Å |
|
| 20171129 |
Red+2 |
R300V |
5750 |
> +2300 Å |
Both upper and lower limits should be still measured. |
