Instrumentation
First light instruments are being designed to exploit the survey capabilities of the OAJ telescopes. In particular, a wide field camera has been developed for the JAST80 and another one is being developed for the JST250.
The following table summarizes some basic parameters of the instruments.
| JPCam | T80Cam | |
|---|---|---|
| FoV | 3º | 1.4º |
| EE50 | Ø =11 μm | Ø =6 μm |
| EE80 | Ø =22 μm | Ø =13 μm |
| CCD format | (14x) 9,216 x 9,232 pix, 10 μm/pix | 9,216 x 9,232 pix, 10 μm/pix |
| Pixel scale | 0.2267 “/pix | 0.55 “/pix |
| Read out time | 12s | 12s |
| Read out noise | 4 e- (RMS) | 3.4 e- (RMS) |
| Number of filters | 70 | 12 |
T80Cam mounted at the JAST80 Cassegrain focus
The scientific instrument for the JAST80 telescope and for J-PLUS is T80Cam, a wide-field camera installed at the Cassegrain focus. It is equipped with a 9.2k-by-9.2k, 10μm pixel, high efficiency CCD that is read from 16 ports simultaneously, allowing read times of 12s with a typical read noise of 3.4 electrons (RMS). This full wafer CCD covers a large fraction of the telescope’s field of view (FoV) with a pixel scale of 0.55"/pixel.
JPCam conceptual design (credit: Fernando Santoro, J-PAS collaboration)
JPCam is a wide field 14 CCD-mosaic camera that will be installed at the Cassegrain focus of the JST250. It is intended for surveys with JST250 starting with the planned J-PAS. The mosaic of 14 large format CCDs covers a large fraction of the JST250 FoV with a pixel scale of 0.2267"/pixel.