Nightly Observing Plan for MJD 58465 (starting the evening of Dec 12, 2018)¶
- Josh Frieman (Run manager)
- Rob Morgan (Observer 2)
- Santi Avila (Observer 1)
- Manuel Hernandez, Claudio Aguilera (night assistant)
- Staff calendar
from kentools ephem
mjd 58465, date 20181212, Site CTIO, UT-offset 3 hr Current local time 16:58 CLST UT 19:58 SidTim 20:42 Event Local-Time Greenwich Sidereal-Time Sunset 20:47 CLST 23:47 UT 00:30 8 deg Eve. -10 21:27 CLST 00:27 UT 01:11 18 deg Zeropoint; standards Eve. -14 21:50 CLST 00:50 UT 01:34 24 deg Begin obstac Eve. -18 22:14 CLST 01:14 UT 01:58 30 deg Last chance standards Moonset 00:47 CLST 03:47 UT 04:30 68 deg Midpoint 01:37 CLST 04:37 UT 05:20 80 deg Morn -18 04:59 CLST 07:59 UT 08:42 130 deg Begin astronomical twilight Morn -14 05:23 CLST 08:23 UT 09:07 137 deg End obstac; begin standards Morn -10 05:46 CLST 08:46 UT 09:30 142 deg Sunrise 06:27 CLST 09:27 UT 10:10 152 deg Moon position (deg): RA 328.4, Dec -14.7 Phase: 0.368
- At 17:00 local time, clouds rolled in 2 hours ago, warm (17 degrees) with light breeze (6 mph), humidity 41%
- Tonight: Forecast about 30% clouds at start of night, then becoming clear, Temp. 10 degrees, light breeze shifting from northwest to south, high humidity ~70%.
- Detailed hourly forecast | Satellite maps
Observing Plan and Goals for the Night¶
- DES Half night
- Evening standards
UT Date = '2018/12/13 00:27' Local time = 21:27 SDSSJ0320-0000 ra 03:20:00 dec +00:00:00 secz 1.4 SDSSJ0100-0000 ra 01:00:00 dec +00:00:00 secz 1.2
- Midpoint standards
UT Date = '2018/12/13 04:37' Local time = 01:37 SDSSJ0843-0000 ra 08:43:00 dec +00:00:00 secz 1.8
h3. Useful links
Notes from 4PM Meeting¶
Telescope and camera are good, calibrations about to start. All data from last night processed by DESDM, all declared good, and accepted into survey table.
- Do standards if clear.
- At start of night, remaining survey fields likely still at airmass above 1.4, so instead of starting with Obstac, the decision tree is as follows:
1. If seeing <1.1" in i-band and sky is clear, execute MACS-J0416-i-band-1 script in /usr/remote/user/DECamObserver/ExposureScripts/DES_script/MACSJ0416_i_1.json. This is a deep field with good spectroscopy for photo-z calibration. Estimate this will take about 40 minutes
2. If seeing <1.3" in i-band and sky completely clear, execute up to 1 photosweep (about 1 hr), with preference for complete photosweep in a night. Instructions on creating photosweep scripts are below.
3. Otherwise execute E2 narrowband script SN-E2-N964.json, which should also take 1 hour.
4. Execute Obstac starting after 01:28 UT (10:28 PM local time), when remaining survey fields should reach airmass limit, unless seeing is bad (see below).
- If seeing is bad (Bad means if the psf is > 1.6 arcsec for several exposures in a row with no sign of improvement) complete Photosweep, then Narrowband (details below). If running Narrowband, prioritize E2.
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.