Indian Astronomical Observatory, Hanle
First light obtained on September 26, 2000
Telescope Released for Science Observations Beginning 2003 May
A 2-m aperture optical-infrared telescope, the Himalayan Chandra Telescope (HCT) manufactured by the EOS Technologies Inc., Tuscon, Arizona, USA is installed at IAO. The telescope is remotely operated from CREST, Hosakote, via a dedicated satellite link.
The telescope is equipped with 3 science instruments which are mounted on an instrument mount cube at the cassegrain focus of the telescope. The instrument mount cube has four side ports and an on-axis port, which makes all three instruments available mounted on the telescope. The instruments currently available are the Himalaya Faint Object Spectrograph (HFOSC), the NIR Imaging Spectrograph (TIRSPEC), and the Hanle Echelle Spectrograph (HESP).
Since May 2014, the NIR imager has been replaced by a new NIR instrument developed by TIFR (TIRSPEC). The details of TIRSPEC are available at http://web.tifr.res.in/~daa/tirspec
The Hanle Echelle Spectrometer (HESP) is released for observations beginning 2017 January.
- Instrument Manual
- Observer's Manual
Altitude over azimuth
Cassegrain; provision for Nasmyth
f/1.75 primary; f/9 Cassegrain
Field of View
7 arcmin; 30arcmin with corrector
Image quality (zenith)
80% power < 0.33 arcsec dia; 90% power < 0.73 arcsec dia
Jitter & periodic errors
< 0.25 arcsec on each axis
< 0.45 arcsec over 17 arcsec move;
< 1.5 arcsec for > 10 deg move