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Marty Murphy, 12/01/2018 01:56 PM


Nightly Observing Plan for MJD 58454 (starting the evening of Dec 1, 2018)

DES has the full night.


  • Larissa Markwardt (Observer 2)
  • Nikolay Kuropatkin (Observer 1)
  • Martin Murphy (Run Manager)

CTIO Staff


from kentools ephem

Ephemeris Goes Here

Weather Conditions

Observing Plan and Goals for the Night

  • DES full night
  • Evening standards
    Evening Standards go here
  • Morning standards
    Morning Standards go here

Useful links

Nightsum | CTIO Night Report | DECam Logbook
Tololo Environmental Web Page | Detailed hourly forecast | Satellite maps

Notes from 4PM Meeting

For tonight:

  • C1, C2, & C3 reverberation mapping fields at 03:30 UT (00:30 local)
  • [if seeing is bad*] do reverberation mapping

*This means if the psf is > 1.6 arcsec for several exposures in a row with no sign of improvement. Choose which script to use based on the SN field that is transiting at the time the seeing is bad. Use to decide which one.

If poor seeing persists after Reverberation Mapping then Photosweep, then Narrowband (details below):


If you have "Bad Seeing" and photometric and not worse than 2.0", do
Photosweep. Instructions can be found here:

Do not bother with this program if clouds are visible on Rasicam or if
seeing is highly variable, for the varying aperture corrections make
it difficult to get to mmag accuracy.

One needs to run a script at CTIO to generate the jsons (see the
instructions wiki page). Having done that the Photosweep scripts can
be found in
with names like: photosweep20180914-2200Z.json

Select the one with timestamp closest to the next top of hour, now in
UT (we got the z added). Do not bother with this is there's < 30
minutes left in the night. A script probably takes an hour.


If "Bad Seeing" and not photometric, or if "Bad Seeing" and everything
else if done, then do Narrowband. Instructions and a description can be found here:

Narrowband scripts are in the same directory as Photosweep, and have names like SN-C3X-N964.json

They are on the SN fields, so select the field that is closest to transit. Transit time for SN fields can be found on this page:

These are expected to be about an hour long. If the clouds are only moderate, we could do these. Again, Obstac if seeing isn't bad, and waiting on reverb mapping fields to near transit.

Priorities (highest to lowest)

Other Notes