Aryabhatta Research Institute
of observational Sciences
3.6m Devasthal Optical Telescope (DOT)
Aryabhatta Research Institute
of observational Sciences
IMAGER is an optical imaging instrument covering wavelengths ranging from 400 to 900nm. It employs a 4096 x 4096 CCD camera with a pixel scale of about 0.1 arcsec on the telescope and it covers a field of view of 6.5 x 6.5 arcmin. The available filters are Bessel U,B,V,R,I and SDSS u,g,r,i,z. Imaging observations show that the instrument has the capability to observe sources up to 24.0 mag, 25.2 mag and 24.6 mag with 10% photometric accuracy in B, g, r band respectively, with corresponding effective exposures of 1200s, 3600s, and 4320s. Stellar images with FWHM of 0.55 arcsec in R-band have been recorded in best conditions. It can only be mounted on the axial-port of the telescope.
| Parameters | Value |
| Type | Imaging |
| Mount position | Axial main port |
| Wavelength range | 400-900 nm |
| Array size | 4096 X 4096 pixel2 |
| Pixel size | 15 μm |
| Pixel scale | 0”.1 |
| Field of view | 6.’5 X 6.’5 |
| Readout noise in electron (speed) | 7-9 (1 MHz), 4-6 (500 kHz), 2-3 (100 kHz) |
| Readout time | 20s |
| Gain | 1, 2, 3, 5, 10e-/ADU |
| Minimum exposure time | 10 ms |
| Available filters | Bessel: U, B, V, R, I and SDSS: u, g, r, i, z |
| Limiting magnitude | 24, 25.2, 24.6 mag with 10% photometric accuracy in B, g, r bands, respectively, with effective exposures of 1200s, 3600s, and 4320s |
