|
Slit
Position Name
|
Detent
Number from Home
|
Slit
Physical Size
|
Slit
Angular Size
|
Slit
Description or Use
|
|
Home
= SR
|
0
|
Open
|
Open
|
Home
position, out of the beam ("Software Right") |
|
S0
- Pluto
|
138
|
...
|
20"
clear of end
|
Slit plate almost
covering center of field, but 20" away. This is the slit plate
position that puts the S1 slit just off the object but allows object
photometry. Buie's Pluto imaging mode.
|
|
S1
- TN
|
188
|
0.0073
x 1.8404"
|
1.2"
x 5'
|
Tall-Narrow
- Most commonly used F/5 slit - matches median seeing to 2 pixels
resolution in spectrum - "Buie slit" |
|
S2
- D1
|
208
|
Closed
|
Closed
|
Dark
#1 - no opening, for obtaining spectroscopic darks |
|
S3
- TM
|
228
|
0.0110
x 1.8404"
|
1.8"
x 5'
|
Tall-Medium
- for matching to less optimal F/5 seeing |
|
S4
- FE
|
248
|
0.0613
x 1.8404" + 2@ 0.073 x 0.1497"
|
10"
x 5' +
2@1.2"
x 25"
|
Fat-Eared
- a very wide slit, with very narrow "ears" to top and bottom
to allow accurate night sky lines to be registered |
|
S5
- TSW
|
268
|
0.0221
x 1.8404"
|
3.6"
x 5'
|
Tall-Super-Wide |
|
S6
- TW
|
288
|
0.0148
x 1.8404"
|
2.4"
x 5'
|
Tall-Wide |
|
S7
- TSN
|
308
|
0.066
x 1.8404"
|
1.08"
x 5'
|
Tall-Super-Narrow
- also useful for F/17 as Hyper-Wide |
|
S8
- D2
|
338
|
Closed
|
Closed
|
Dark
#2 |
|
S9
- SM
|
348
|
0.0033
x 1.1039"
|
0.54"
x 3'
|
Short-Medium
- (usually for F/17) |
|
S10
- OC
|
368
|
0.1227"
dia
|
20"
dia open
|
For
refinding object w/o removing slit |
|
S11
- SN
|
388
|
0.0022
x 1.1039"
|
0.36"
x 3'
|
Short-Narrow
- the narrowest slit in the plate |
|
S12
- SW
|
408
|
0.0044
x 1.1039"
|
0.72"
x 3'
|
Short-Wide |
|
S13
- SSW
|
428
|
0.0055
x 1.1039"
|
0.90"
x 3'
|
Short-Super-Wide |
