SPHERE Exposure Time Calculator
IRDIS Infra-Red Dual Imaging and Spectrograph Mode
Version P114
Description
FAQ
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Target Setup
Stellar template spectrum:
Spectral Type:
O9V
B0V
B2V
B3V
B5V
B8V
A0V
A2V
A5V
F0V
F2V
F5V
G0V
G2V
G5V
K0V
K2V
K4V
K5V
K7V
M0V
M2V
M3V
M4V
M5V
M6V
Target Magnitude and Mag.System:
Y
J
H
K
=
Vega
AB
Equatorial Coordinates:
Declination:
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
+5
+10
+15
+20
+25
+30
+35
degrees
Hour Angle:
-4
-3
-2
-1
0
+1
+2
+3
+4
hours
(at the time of the middle of total integration)
Companion to be detected
Point Source
Extended Source:
mag:
per arcsec
2
; size:
arcsec
Sky Conditions
Turbulence Category:
10% (seeing ≤ 0.6" & tau0 ≥ 5.2ms
20% (seeing ≤ 0.7" & tau0 ≥ 4.4ms
30% (seeing ≤ 0.8" & tau0 ≥ 4.1ms
50% (seeing ≤ 1.0" & tau0 ≥ 3.2ms
70% (seeing ≤ 1.15 & tau0 ≥ 2.2ms
85% (seeing ≤ 1.4" & tau0 ≥ 1.6ms
Instrument Setup
Mode:
Dual Band Imaging (DBI)
Classical Imaging (Cl)
Derotator:
pupil-stabilized
field-stabilized
Filter/Spectral Resolution:
DB_H23
DB_Y23
DB_J23
DB_H34
DB_K12
DB_ND23
BB_H
BB_Y
BB_J
BB_Ks
NB_Hel
NB_CntJ
NB_PaB
NB_CntH
NB_FeII
NB_CntK1
NB_H2
NB_BrG
NB_CO
NB_CntK2
LRS
MRS
Coronagraph:
none
coron
Neutral Densities:
none
ND1
ND2
ND3.5
Observation Setup
Exposure Time:
seconds
range [10, 14400]
DIT:
0.83
2.0
4.0
8.0
16.0
32.0
64.0
seconds
Output Setup
Imaging:
differential
no differential
Contrast Performance curve (all noise contributors cumulated)
Contrast curves (associated with each noise contributor)
Noise Contributors (logarithmic plot)
Orientation curve (as a function of hour angle)
Rotation Rate curve (as a function of hour angle)
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