65cm reflector and intruments

65cm reflector

Optical designCassegrain
Free aperture65 cm
Focal length780 cm
Focal ratioF/12.2
65 cm reflector

Observational instruments

CCD camera
ChipSITe 512 x 512 (24 microns/pixel), Back illuminated
Cooling systemElectric cooling ( -40 deg )
Filters Bessel UBVRI, intermediate bandpasses.
  • U: 1UG1 + 1BG39 + 3WG305
  • B: 2GG385 + 1BG12 + 2BG39
  • V: 2GG495 + 3BG39
  • R: 2OG570 + 3KG3
  • I: 3RG9 + 2WG305
GCS , Gunma Compact Spectrograph
Wavelength380 ~ 760 nm or 500 ~ 900 nm (both for Resolution = 500)
Resolution500 , 2000 @ 500nm (select by changing gratings)
Gratings300gr./mm , 1200gr./mm. blaze=500nm.
Slit length10 arcmin.
Slit width2 arcsec.
Optec SSP-7 Precision Photoelectric Photometer
TypeDC
PhotomultiplierHamamatsu R6357 (Side-on), Response 1850 Å -9000 Å
Cooling systemThermoelectric 1-stage.
Integration timeFast mode: 20,50,100 msec, Slow mode: 1 sec - 1 minute
FiltersJohnson UBVRI, ND, Stromgren uvby
Gunma Astronomical Observatory