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Date

Attendees

Goals

Discussion items

TimeItemWhoNotes
Target fluence recommendations
  • NIRCAM:
    • Recommend ~35K ADU
  • NIRISS:
    • Mean bias = 11.6k ADU
    • Mean soft saturation = 50.5 ADU above bias (range is 43k-59k)
    • Recommend ~35k ADU??? (~75% of saturation)
  • NIRSpec
    • Maria Pena-Guerrero?
  • MIRI
    • Daniel Dicken?
 MIRI UpdateSarah
  • Should we enable number of exposures (NExp) > 1 for TSOs?

JWST QuickLook
  • Ideas for TSO-specific monitor
  • Demonstrate WFC3 TSO QL monitor

NIRISS Update

Jonathan

  • F277W

NIRCam UpdateJonathan
  • TA on saturated targets

NIRSpec Update?Maria

APT Phase Constraint Error

For very long exposures, the APT visit planner fails to satisfy the phase constraint.

  • See JWST program 1201 (NEAT), observation 11 (phase curve observation of WASP-121b)
  • The phase constraint is correctly set, but the calculated visibility periods do not satisfy it.
  • The problem appears whenever t_exp > P - w -1048, where t_exp is the total exposure time, P is the planet period, and w is the time width of the of the observing start window specified in the phase constraint, all in seconds.
  • PR 90539

Proposed workarounds:

  1. The user doubles the period and recalculates the phase start and end to apply to only one of the two transits in that doubled period. (Downside: loss of half of the scheduling opportunities, but that shouldn't be a big deal since there are so many.)
  2. The user could double the period and create two observations - one with the start and end time of the first transit and one with the start and end time of the second transit. The second observation could be put "on hold" in case it is needed for increased scheduling flexibility.
  3. Create a short observation that can be correctly constrained and SEQ NON-INT it to the desired long TSO observation. This is a more elegant solution, but has more overheads associated with it.
  4. Use a single tight Between to nail down the observation to a single transit. This would be helpful when coordinating the observation with another observatory.

Agreed upon solution:

When APT calculates that the observation is long enough that VSS will not be able to honor the specified Phase requirement (** see note below) then APT will take the following actions:

  1. Create two visits
  2. First visit will be very short (perhaps only a couple minutes)
    1. A S/C visit with the same aperture as the science observation
    2. No GS Acg
    3. No Target Acq
    4. Will have a Phase Special Requirement
    5. This Phase will have the start and end time adjusted so that the requested start and end time are honored for the science
  3. The second visit will be the Target Acq and science originally requested
  4. Link the two visits with a SEQ NON INT
  5. Inform the user via a warning what was done and why




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