EXPOSURE SIMULATOR
Get some
HELP
about this form.
Select the
spatial sampling
and field you plan to use :
0.04" sampling, 1.6"x1.2" field (f/20 AOB)
0.11" sampling, 4.1"x3.3" field (f/20 AOB)
0.16" sampling, 6.2"x5.0" field (f/20 AOB)
0.27" sampling, 10,4"x8,3" field (f/8 Cassegrain)
0.30" sampling, 11"x9" field (f/20 AOB)
0.41" sampling, 15"x12" field (f/8 Cassegrain)
Select the
spectral configuration
you plan to use :
LR2 : range 8650Å to 10350Å, sampling 4.74Å/pxl.
MR0 : range 4150Å to 4930Å, sampling 2.13Å/pxl.
MR1 : range 4760Å to 5550Å, sampling 2.15Å/pxl.
MR2 : range 6210Å to 6980Å, sampling 2.17Å/pxl.
MR3 : range 8350Å to 9140Å, sampling 2.23Å/pxl.
MR4 : range 5510Å to 6320Å, sampling 2.16Å/pxl.
MR5 : range 6940Å to 7760Å, sampling 2.19Å/pxl.
MR6 : range 7690Å to 8450Å, sampling 2.21Å/pxl.
MR7 : range 9150Å to 9890Å, sampling 2.25Å/pxl.
HR1 : range 4840Å to 5180Å, sampling 0.99Å/pxl.
HR2 : range 5120Å to 5480Å, sampling 1.00Å/pxl.
HR3 : range 6200Å to 6540Å, sampling 0.99Å/pxl.
HR4 : range 6490Å to 6820Å, sampling 1.00Å/pxl.
HR5 : range 8440Å to 8740Å, sampling 0.87Å/pxl.
Select the CFHT
CCD
you plan to use :
LORAL3__, Q.E. 45% @7000Å, read noise 8.6e-/pxl, dark 0.85e-/hr/pxl, full well 70000e-
Do you plan to observe a
star cluster
, or an
extended object
?
For a
star
cluster, what is :
The
image quality
(") expected at OASIS input :
The
B
,
V
,
R
,
I
, typical star
magnitude
:
For an
extended
object, give :
The
B
,
V
,
R
,
I
,
magnitude
(arcsec
-2
) :
Or the
flux
(W m
-2
arcsec
-2
,
per Å for continuum) :
10
-
The flux is dominated by
continuum emission
The flux is dominated by an
emission line
of
Å rest
FWHM
,
of rest wavelength
Å,
redshifted to Z =
Exposure zenithal distance
(deg.)
Moon zenithal distance
(deg.)
Moon phase
,
from 0 (new) to 1 (full)
Moon distance
(deg.) from the object
Signal-to-noise ratio
to be achieved
Exposure time
(seconds)
Atmospheric dispersion compensator
ON
, or OFF (often unwise, see manual)
?
Optional
parameters :
Compute the
exposure time
needed to reach the requested S/N ratio with the given
object flux
Compute the
S/N ratio
expected in the given exposure time with the given object flux
Compute the
minimum object flux
to get the requested S/N ratio in the given exposure time
Back to
OASIS
home page.
Back to
top
Last update: 12/22/1998. Send comments to
ga@obs.univ-lyon1.fr
