CERRO TOLOLO INTER-AMERICAN OBSERVATORY 
        2MASS 1.3M TELESCOPE
=======================================

  Instrument Host Overview                                                    
  ========================                                                    
    The 2MASS project was carried out with two identical 1.3-meter aperture,  
    open-tube, equatorial fork-mount telescopes. These telescopes have been   
    provided with a Cassegrain focus mount for the infrared cameras and a     
    secondary mirror, which is articulated in the declination direction.  The 
    telescope described here is the one in the southern hemisphere, at Cerro  
    Tololo Interamerican Observatory.                                         
                                                                              
    Primary Mirror: 1300 mm diameter, radius 5200 mm, conic constant -1.000   
    Secondary Mirror: 232 mm diameter, radius 965.7 mm, conic constant -1.847 
                                                                              
    The telescopes were designed, manufactured, and installed by M3           
    Engineering and Technology Corp., Tucson, AZ. The optics were figured by  
    Rayleigh Optical Corp., Baltimore, MD. The telescope control system       
    software was provided by Comsoft, Tucson, AZ. After the completion of the 
    2MASS data-taking, the University of Massachusetts donated the telescopes 
    to the host observatories.                                                
                                                                              
          GROUP                        = OBSERVATORY_PARAMETERS               
            OBSERVATORY_ID             = 'OBS055'                             
            NAME                       = 'CERRO TOLOLO INTER-AMERICAN         
    OBSERVATORY'                                                              
            COUNTRY                    = 'CHILE'                              
            ADDRESS                    = 'Casilla 603, La Serena'             
          END_GROUP                    = OBSERVATORY_PARAMETERS               
                                                                              
          GROUP                        = TELESCOPE_PARAMETERS                 
            TELESCOPE_ID               = 'T6'                                 
            NAME                       = '2MASS 1.3M TELESCOPE'               
            APERTURE                   = 1.3 <METERS>                         
            LONGITUDE                  =  -70.805080 /* -70 48 18.29 E */     
            LATITUDE                   =  -30.167690 /* -30 10 03.7 */        
            ALTITUDE                   = 2171 <METERS>                        
            COORDINATE_TYPE            = 'Astronomical'                       
          END_GROUP                    = TELESCOPE_PARAMETERS