| Wavelength |
| grism |
|
|
| observing wavelength |
|
[Å] |
| integral range (e.g., spectral resolution) |
|
[Å] |
|
|
|
| Object Flux |
|
|
| object magnitude |
|
[AB mag] |
| object flux in the wavelength range |
|
[erg cm-2 s-1] * Total flux in the "integral range" |
| seeing (or FWHM of target) |
|
|
|
|
| object magnitude |
|
[AB mag arcsec-2] |
| object flux in the wavelength range |
|
[erg cm-2 s-1 arcsec-2] |
| Number of combining fibers |
|
1 fiber = 0.6111 [arcsec2] |
|
|
|
| Observation Settings |
| exposure time of a frame |
|
[sec] |
| number of frames |
|
|
|
|
|
| Sky Condition |
| sky background brightness |
|
[AB mag] |
|
[erg cm-2 s-1 arcsec-2 Å-1] |
Airmass
Elevation |
|
1 / cos(90° - Elevation) |
|
[deg] |
|
|
|
For Experts |
| field of view per fiber |
|
[arcsec2] |
| optics throughput (including atmosphere and telescope) |
|
[%] (cf. see throughput@20220722) |
| number of combining fibers |
|
|
object flux fraction in aperture
(Gaussian 3-sigma for point source) |
|
[%] |
| Atmosphere Extinction (extinction curve) |
|
[mag/airmass] |
| Extinction rate |
|
[%] : Extinction * ( Airmass - 1 ) |
| number of extract pixels for fiber direction |
|
[pixel] |
| readout noise |
|
[e- / pixel] |
| wavelength-pixel scale |
|
[Å] |
| M1 radius |
|
[cm] |
| M1 shaded radius by M2 |
|
[cm] |