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| 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 values here displayed are for the CCD #4 with no binning (bin 1x1), and for readout speeds slow and fast.
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| Readout Speed | Filter | Filter Nr. | Filter (Mimic) |
Flat Lamp Lightening | Exp. time (s) |
| Slow | O5008 | 196 | O3 | Full | 60 |
| 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 |
| Slow | StrY | 201 | stY |
Full | 12.9 |
| Slow | He4686 | 206 | He2 |
Full | 103 |
| Slow | H-alpha (8160) | 209 | N8 |
Full | 10 |
| Slow | S6725 | 212 | SII |
Full | 9 |
| Slow |
StrHbW |
224 |
Hbb |
Full |
35 |
| Slow | StrHbN | 225 | Hbn |
Full | 240 |
| Slow | 782 | 236 | 782 |
Full | 6 |
| Slow | 804 | 237 | 804 |
Full | 6 |
| Slow | HARB | 191 | B | Full | 60 |
| Slow | HARV | 192 | V | Full | 2.5 |
| Slow | HARR | 193 | R | Full | 2 |
| Slow | RGOI | 194 | I | 1/3 | 3.5 |
| Slow | RGOZ | 195 | Z | 1/3 | 6.1 |
| Slow | SloanR | 214 | r |
Full | 2 |
| Slow | SloanI | 215 | i |
3/4 | 2 |
| Slow | SloanG | 220 | g |
3/4 | 15 |
| Fast | O5008 | 196 | O3 | Full | 120 |
| Fast | H-alpha | 197 | Ha |
Full | 18 |
| Fast | StrU | 198 | stU | Full | |
| Fast | StrV | 199 | stV |
Full | 1030 |
| Fast | StrB | 200 | stB | Full | 90 |
| Fast | StrY | 201 | stY |
Full | 25.8 |
| Fast | He4686 | 206 | He2 |
Full | 205 |
| Fast | H-alpha (8160) | 209 | N8 | Full | 20 |
| Fast | S6725 | 212 | SII |
Full | 17.9 |
| Fast | StrHbW | 224 | Hbb |
Full | 72 |
| Fast | StrHbN | 225 | Hbn | Full | 480 |
| Fast | HARB | 191 | B | Full | 120 |
| Fast | HARV | 192 | V | Full | 5 |
| Fast | HARR | 193 | R | Full | 4 |
| Fast | RGOI | 194 | I | 1/3 | 7.4 |
| Fast | RGOZ | 195 | Z | 1/3 | 12 |
| Fast | SloanR | 214 | r |
Full | 5 |
| Fast | SloanI | 215 | i |
Full | 2 |
| Fast | SloanG | 220 | g |
Full | 30 |
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