ING Banner
Home > Astronomy > Wide Field Camera > Observing Guide

WFC Dome Flat Assistant

We give some guides about exposure times to be used with WFC and different filters to acquire dome flats with optimum signal (around ~30,000 +/- 1000 counts). We include two dome lightening levels, namely Full and 2/3 setting (corresponding to the marker on the dial pointing to the top left corner of its square casing). The telescope should point to hour angle 0 0 0, declination +80 0 0 (use command 'park flat' in TCS), and the dome should have position 242. The mirror petals should be open, dome shutter closed, and in the dome only the flat lamps on. The CCD with no binning (bin 1x1).

Readout Speed Filter Filter Nr. Filter (Mimic)
Flat Lamp Lightening Exp. time (s)
Slow
O5008
196
O3
Full

Slow H-alpha (H6568)
197 Ha
Full 9
Slow
StrU
198
stU
Full

Slow
StrV
199
stV
Full
520
Slow
StrB
200
stB
Full
47
SlowStrY201stY
Full12.9
Slow He4686 206 He2
Full 103
Slow
H-alpha (8160)
209
N8
Full
10
SlowS6725212SII
Full9
Slow
StrHbW
224
Hbb
Full
35
Slow
StrHbN
225
Hbn
Full
240
Slow
782
236
782
Full
6
Slow
804
237
804
Full
6
SlowHARB
191
B
Full
20
SlowHARV
192
V
Full
2.5
SlowHARR
193
R
1/3
14
SlowRGOI
194
I
1/3
3.5
SlowRGOZ
195
Z
1/3
6.1
Slow SloanR
214 r
2/3 3.1
SlowSloanR
214r
1/317
Slow
SloanI
215
i
1/3
4.7
Slow OIII 196
Full 60
Slow
g
220

Full
5
Fast
O5008
196
O3
Full

Fast H-alpha 197 Ha
Full 18
Fast
StrU
198
stU
Full

Fast
StrV
199
stV
Full
1030
Fast
StrB
200
stB
Full
90
FastStrY201stY
Full25.8
Fast He4686 206 He2
Full 205
Fast
H-alpha (8160)
209
N8
Full
20
FastS6725212SII
Full17.9
Fast
StrHbW
224
Hbb
Full
72
Fast
StrHbN
225
Hbn
Full
480
FastHARB
191B
Full
41
FastHARV
192
V
Full
5
FastHARR
193
R
1/3
30
FastRGOI
194
I
1/3
7.4
FastRGOZ
195
Z
1/3
12
Fast SloanR 214 r
2/3 6.3
FastSloanR
214r
1/337
Fast
SloanI
215
i
1/3
9.3
Fast OIII 196
Full 120
Fast
g
220

Full
10


Top | Back

Contact:  (WFC Instrument Specialist)
Last modified: 10 January 2013