Malls Exposure Time Calculator
These calculations are based on the following conditions.
==Star spectral data==
HD 289002
star spectral type B1
==observation conditions==
seeing size: 1.5 arcsec
slit width = 0.8 sec
slit filter = Clear
recommended order cut filter
--See
this page
Calculate S/N ratio
Grating
300
1800
Center Wevelength
7500 Å
6500 Å
5500 Å
4500 Å
V mag
Expsure time
sec
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SN ~
Calculate Exposure time
Grating
300
1800
Center Wevelength
7500 Å
6500 Å
5500 Å
4500 Å
V mag
S/N ratio
|
|
|
|
|
Exposure time ~
seconds
last update : 3 Oct 2018