Imager
DECOMMISSIONED: The 2.3m Telescope Imager was an optical imaging camera mounted at a Nasmyth focal station.
Facilities
About
The 2.3m Telescope Imager is an optical imaging camera that is mounted at a Nasmyth focal station. The Imager detectors were upgraded and a new CCD controller installed in 2004.
Basic specifications
- Mounted at f/18 Nasmyth focus
- Field of view: 6.62 arcmin in diameter
- Detector: 2048x2048 thinned E2V CCD
- Pixel size: 13.5 micron
- Plate scale: 0.338 arcsec/pixel
- Readout time (for 1200 pixel box): approximately 10 seconds
Information for observers
The Imager is mounted at the Nasmyth focus of the ANU 2.3m telescope and provides a 6 arcminute field of view with a plate scale of 0.34 arcsec/pixel. It is equipped with a 2kx2k E2V CCD detector.
Performance
An exposure time calculator can be found here: Imager exposure calculator
Imager throughput:
- U: 1 electron/sec = 21.2 mag
- B: 1 electron/sec = 23.8 mag
- V: 1 electron/sec = 24.4 mag
- R: 1 electron/sec = 24.3 mag
- I: 1 electron/sec = 23.6 mag
Spectral response:
Detector characteristics
| GAIN | CDS Gain | System Gain (e-/adu) | Noise (e-) | Bias (adu) |
|---|---|---|---|---|
| 0 | 9.5 | 0.53 | 4 | 1190 |
| 1 | 4.75 | 1.1 | 3.6 | 1181 |
| 2 | 2 | 2.4 | 4.4 | 1166 |
| 3 | 1 | 5.6 | 6.8 | 1155 |
Filters at Siding Spring Observatory
Broad Band Filters
| Filter | Characteristics |
|---|---|
| U - UG1 x 1, BG39 x 1, WG295 x 3 | Round |
| B - BG12 x 1, GG395 x 2, BG39 x 2 | Round |
| V - GG495 x 2, BG40 x 3 | Square |
| R - OG570 x 3, KG3 x 2 | Square |
| I - RG9 x 3, WG x 2 | Round |
| U - CuSo4 | Square |
| M - GG455 x 2, BG23 x 3 | Round |
| C - BG40 x 2, BG3 x 3 | Round |
| BJ - BG28 x 2, BG39 x 3 | Round |
| Special BJ for B.A.Peterson | 2 inch square |
| Special Z for M.Bessell | 2 inch square |
| 640nm BP150nm for B. Schmidt | 50mm square |
| 785nm BP125nm " " " | 50mm square |
| 595nm BP140nm " " " | 50mm square |
| 733nm BP115nm " " " | 50mm square |
Narrowband
Italian 50mm Filter Set (these comprise of 2 filter wheels which are normally housed in a yellow plastic box next to 2.3m filter storage drawers)
| Narrowband | Characteristics |
|---|---|
| 6596/? | 90mm round |
| 5321/10 | 75mm round |
| 6585/50 | 90mm round |
| 3727/31 | 75mm round |
| 5306/10 | 75mm round |
6620/25
| 50mm round |
| 6450/40 | 50mm round |
| 4759/40 | 50mm round |
| 4695/25 | 50mm round |
| 4014/30 | 75mm round |
| 5816/48 | 75mm round |
| 6590/19 | 100mm round |
| 6620/25 | 100mm round |
| 4900/30 | 100mm round |
| 6626/55 | 75mm round |
| 3905/30 | 75mm round |
| 5332/13 | 100mm round |
| 6576/15 | 75mm round |
| 3727/? | 75mm round |
| 4900/30 | 50mm round |
| 5313/10 | 75mm round |
| 4881/20 | 50mm round |
| 5020/40 | 100mm round |
| 5016/25 | 75mm round |
| 6676/55 | 75mm round |
| 6574/50 | 90mm round |
| 6732/25 | 50mm round |
Italian 50mm Filter Set (these comprise of 2 filter wheels which are normally housed in a yellow plastic box next to 2.3m filter storage drawers)
Wheel 1
- 645.0/7.5nm
- 509.7/6.0nm
- 506.0/6.0nm
- 502.2/6.0nm
- 494.6/6.0nm
- 490.8/6.0nm
- 487.0/6.0nm
- 478.0/7.5nm
- 668.0/7.5nm
Wheel 2
- 498.4/6.0nm
- 513.5/6.0nm
- 517.5/6.0nm
- 521.3/6.0nm
- 528.0/12.0nm
- 673.0/7.5nm
- 678.0/7.5nm
- 683.0/7.5nm
- 684.5/6.0nm
- 688.0/7.5nm
- 695.0/15.0nm