HCT INSTRUMENTS | HESP
Instrument
Cassegrain unit |Spectrograph |Calibration unit |Observing modes & Efficiencies
HESP - Hanle echelle spectrograph
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Hanle echelle spectrograph is a fibre-fed, high resolution (R = 30,000 and 60,000), spectrograph for the 2m HCT telescope. It was developed in collaboration with IRL (Industrial Research Lab, Kiwi Star), New Zealand. The project was funded by Department of Science and Technology (DST), India.
The spectrograph design is a bench mark for compact size, large wavelength coverage and high throughput, based on a white pupil concept. A complete wavelength coverage over 350 - 1000nm, will allow measurement of chemical abundances of key elements of stellar evolution.
The high mechanical stability and double fibre mode will allow measurement of precise radial velocities, essential for programs such as exoplanet studies and astroseismology.
Specification
| Spectral coverage | : | 350-1000nm |
| Resolution | : | 30000 (without image slicer) |
| : | 60000 (with image slicer) | |
| Radial velocity accuracy | : | 20m/s with double fibre mode |
| Stability | : | 100m/s |
| effiency | : | > 20% (450-800nm) |
| Observing modes | : | Object/ThAr, Object/Sky, ThAr/ThAr |
| Faint limit | : | 11mag at median seeing (1.5arcsec) |