Slit Selection Guide

Select the most suitable slit as required for seeing, spectral resolution, and wavelength coverage.

Notes:

The maximum number of slits that can be installed at once is 9 plus a Hartmann plate (10 in total).
Slit exchange during night time can not be made.
Slit name
Barcode No. Slit width Slit position Grism to be selected with
for wider spectral coverage
 Comments
for observation
0."2 center 
SCFCSLLC02
 0."2 center other
0."4 center 
SCFCSLLC04
 0."4 center other


0."6 center 
SCFCSLLC06
 0."6 center other


0."8 center 
SCFCSLLC08
 0."8 center other


1."0 center 
SCFCSLLC10
 1."0 center other


2."0 center 
SCFCSLLC20
 2."0 center other

For STD star
0."2 offset 
SCFCSLLO02
 0."2 110" blue side offset 300B+Y47, 300R(2nd)+L600, Echelle+I


0."4 offset 
SCFCSLLO04
 0."4 110" blue side offset 300B+Y47, 300R(2nd)+L600, Echelle+I


0."6 offset 
SCFCSLLO06
 0."6 110" blue side offset 300B+Y47, 300R(2nd)+L600, Echelle+I


0."8 offset 
SCFCSLLO08
 0."8 110" blue side offset 300B+Y47, 300R(2nd)+L600, Echelle+I


1."0 offset 
SCFCSLLO10
 1."0 110" blue side offset 300B+Y47, 300R(2nd)+L600, Echelle+I


2."0 offset 
SCFCSLLO20
 2."0 110" blue side offset 300B+Y47, 300R(2nd)+L600, Echelle+I

For STD star
Hartmann plate 
SCFCSLHRT1
 0.10mm x 10mm 5 x 5 grid

For focusing FOCAS
Always required
for engineering
grism alignment plate
0.3mm holes 17 holes at 10mm interval


distortion plate
0.3mm holes 10mm grid