ARIES consists of a NIR imager and a spectrograph. The imager is currently available.

Sensitivity

The sensitivity of ARIES in f/15 mode with 0.15” image quality and a 0.18” photometric aperture:-

A single 10 second image reaches H=19.6 with S/N=10
The combination of two background-subtracted 10-second images also reaches H=19.6 mag at S/N=10.

Data provided by Craig Kulesa

Detector	HgCdTe
Pixels across detector	1024×1024
Pixel size (microns)	18.5
Wavelength (microns)	1.1 - 2.5
Focal Ratio	f/15	f/30
Plate scale (arcsec/mm)	2.11	1.06
Field (arcsec/pixel)	0.038	0.019
Full field (inscribed on detector)	40.0 arcsec	20.0 arcsec

Pixel Scale

Measured in May 2004 by comparing M3 with HST astrometry.

24.77812 pixels per arcsecond, r.m.s. fit over 1000 pixels is 0.5 pixels.

Filter Wheels

There are two filter wheels in parallel with an f/15, f/30 and pupil imaging optics.

Wheel 1

ARIES

Sensitivity