FUSE Exposure Time Calculator Version 8.0
2006 Jun 21
Updated with current effective area curve and Lif2 throughputs: June 21, 2006
Instructions for Using the Exposure Time Calculator
Wavelength:
Å
Source flux at above wavelength (reddened or intrinsic) :
ergs cm
-2
s
-1
Å
-1
E(B-V) (leave as 0.0 if source flux is observed or already reddened):
for R
V
=3.1
Aperture:
30.0" LWRS Large Square Aperture
4.00" MDRS High Throughput Aperture
1.25" HIRS High Resolution Aperture
Science requirements:
Calculate the integration time necessary to reach a signal-to-noise ratio of
in
final coadded spectrum
LiF1 channel
LiF2 channel
SiC1 channel
SiC2 channel
Calculate signal-to-noise ratio obtained in an integration of
seconds
Spectral Bin Size:
Å
Dark Count:
counts cm
-2
s
-1
Airglow:
kR
fuse_support@pha.jhu.edu
