MODS Slit Masks

The table below lists the slit masks loaded into the MODS1 and MODS2 slit mask cassettes. The slits may be selected by the maskID code listed (selection by cassette position number is deprecated).

Facility masks are in the reserved positions 1 thru 12. Observer-designed custom masks are loaded in positions 13 thru 24. Please note the following exceptions for 22B - 23A:
  • In the MODS1 cassette, the bent loading chute was making it difficult to insert masks in positions 12 & 24 (IT 8724), so the 2.4" longslit was moved from 12->13 and position 24 was avoided. But Elliott reported that the chute has straightened out now (email Jan 14,2023). Nevertheless, we'll keep the 2.4" longslit in position 13 probably until SSD2023.
  • In the MODS1 cassette, position 19, the detent spring arm may be out of alignment (Elliott noted this 25 Feb 2023).
  • In the MODS1 mask position 14 has a slightly sticky detent roller so leave unoccupied (noted by Rick Pogge, Aug 2023)
  • In the MODS2 cassette, we were avoiding position 5 and the 0.6" longslit has been moved from 5 --> 1 (ITs 8468 and 8597). No other restrictions.
Positions 13-24

Note that in the MODS1 cassette, position 13 will remain occupied by the 2.4" segmented long slit, LS5x60x2.4 (see above).

Cassette MODS1 MODS2
Pos maskID Description Partner maskID Description Partner
1 DarkMask Blank Mask for a Dark Block   LS5x60x0.6 0.6 arcsec Segmented Long Slit  
2 SieveMask Pinhole Imaging Sieve Nr3   SieveMask Pinhole Imaging Sieve Nr3  
3 Imaging Empty Frame for Imaging Stop   Imaging Empty Frame for Imaging Stop  
4 LS5x60x0.3 0.3 arcsec Segmented Long Slit   LS5x60x0.3 0.3 arcsec Segmented Long Slit  
5 LS5x60x0.6 0.6 arcsec Segmented Long Slit   Not Usable No Mask  
6 LS5x60x0.8 0.8 arcsec Segmented Long Slit   LS5x60x0.8 0.8 arcsec Segmented Long Slit  
7 LS5x60x1.0 1.0 arcsec Segmented Long Slit   LS5x60x1.0 1.0 arcsec Segmented Long Slit  
8 LS5x60x1.2 1.2 arcsec Segmented Long Slit   LS5x60x1.2 1.2 arcsec Segmented Long Slit  
9 LS60x5 5 arcsec Spectrophotometry Wide Slit   LS60x5 5 arcsec Spectrophotometry Wide Slit  
10 PinholeSlit Pinhole Slit   PinholeSlit Pinhole Slit  
11 Pointing Mask MODS Pointing Mask   Pointing Mask MODS Pointing Mask  
12 Not Usable No Mask   LS5x60x2.4 2.4 arcsec Segmented Long Slit LBTO
13 LS5x60x2.4 2.4 arcsec Segmented Long Slit LBTO Empty Position Empty  
14 Do Not Use Do Not Use   Empty Position Empty  
15 Empty Position Empty   Empty Position Empty  
16 Empty Position Empty   Empty Position Empty  
17 ID 552749 mods.1048.1030z28 INAF ID 552749 mods.1048.1030z28 INAF
18 ID 520051 mods.1049.1030z28 INAF ID 520051 mods.1049.1030z28 INAF
19 Do Not Use Do Not Use   Empty Position Empty  
20 ID 503205 mods.39.UDS1 INAF ID 503205 mods.39.UDS1 INAF
21 ID 532732 mods.4.g04d25ep LBTO ID 532732 mods.4.g04d25ep LBTO
22 Empty Position Empty   Empty Position Empty  
23 ID 503645 mods.1052.1030z28 INAF ID 503645 mods.1052.1030z28 INAF
24 Do Not Use Do Not Use   Empty Position Empty  
Mask exchange Jan 2 2023 by Chris
Topic revision: r256 - 14 Jan 2024, ElliottSolheid
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