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KI Possible Mode Reconfigurations During a Night

It is possible to use a maximum of two (2) different KI modes during a night, subject to the allowed combinations specified in the table below. The table also gives conservative estimates for the reconfiguration times (which occurs during your observing time).

Please note that all modes which you intend to use must be specified in your proposal
to allow for adequate scheduling and instrument preparation.  Any requests made after the proposal is accepted will
only be supported if the team is able to change modes without adversely affecting other science users and such requests
must be made at least three (3) weeks before the allocated night.



KI possible mode reconfigurations during a night To:
From:

Mode category
for coversheet

H-4
K-5
K-10
K-42
L-10
K-330 (SPR)
Nulling
K/L (SP)
DFPR
Astrometry
H-4
V2
20 min
20 min
20 min

45 min




K-5
20 min

20 min
20 min

30 min


45 min
45 min
K-10
20 min
20 min

30 min

30 min


45 min
45 min
K-42
20 min
20 min
30 min


45 min


45 min
45 min
L-10
V2-L
60 min
60 min
60 min
60 min






K-330 (SPR)
V2-SPR
45 min
30 min
30 min
45 min






Nulling
Nulling







90 min


K/L (SP)
V2-KL






90 min



DFPR
V2-DFPR

45 min
45 min
45 min





10 min
Astrometry
Astrometry

45 min
45 min
45 min




10 min


Important Notes:

  • SPR = Self-Phase Referencing.
  • SP = Split Pupil (same as during Nulling observations).
  • DFPR = Dual Field Phase Referencing.
  • The mode category is for use on the proposal cover sheet.
  • Modes in PURPLE are not fully commissioned (shared-risk).
  • L-band observing requires the use of crypt ZnSe windows, instead of the infrasil windows used in the other V2 modes. For 1/2 night allocations, it may not be possible to switch from ZnSe to infrasil windows, the impact on near-infrared sensitivity is however less than 0.1 mag.
  • Reconfiguration between the L-10 and K-330 (SPR) modes require significantly more preparation. Therefore, whether or not this can be accomodated for a given night with multiple programs will depend on the final Keck schedules for the semester (time between interferometer runs). The PI will be informed whether or not his/her request can be accomodated shortly after the final Keck schedules are published.


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