Imager

The 2.3m Telescope Imager is an optical imaging camera that is mounted at a Nasmyth focal station.

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ANU 2.3m Telescope

About

Imager

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:

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