Nightly Observing Plan for MJD 58468 (starting the evening of Dec 15, 2018)¶
- Santi Avila (Observer 1)
- Qiqi Wang (Observer 2)
- Richard Kron (Run Manager)
- Manuel Hernandez, Alberto Alvarez (night assistant)
- Staff calendar
from kentools ephem
mjd 58468, date 20181215, Site CTIO, UT-offset 3 hr Current local time 17:04 CLST UT 20:04 SidTim 21:00 Event Local-Time Greenwich Sidereal-Time Sunset 20:48 CLST 23:48 UT 00:44 11 deg Eve. -10 21:29 CLST 00:29 UT 01:24 21 deg Zeropoint; standards Eve. -14 21:52 CLST 00:52 UT 01:48 27 deg Begin obstac Eve. -18 22:17 CLST 01:17 UT 02:12 33 deg Last chance standards Midpoint 01:38 CLST 04:38 UT 05:33 83 deg Moonset 02:27 CLST 05:27 UT 06:22 96 deg Morn -18 05:00 CLST 08:00 UT 08:55 134 deg Begin astronomical twilight Morn -14 05:24 CLST 08:24 UT 09:19 140 deg End obstac; begin standards Morn -10 05:47 CLST 08:47 UT 09:42 146 deg Sunrise 06:28 CLST 09:28 UT 10:23 156 deg Moon position (deg): RA 2.9, Dec -3.1 Phase: 0.544
- At 17:00 local time, clear, mild (17 degrees) with light breeze (11 mph), humidity 42%
- Tonight: Forecast clear, Temp. 12 degrees, light breeze from the west, moderate humidity ~50%.
- Detailed hourly forecast | Satellite maps
Observing Plan and Goals for the Night¶
- DES Half night
- Evening standards
UT Date = "12/16/2018 00:19:00" Local time = 21:19 SDSSJ2140-0000 ra 21:40:00 dec +00:00:00 secz 1.9 SDSSJ0320-0000 ra 03:20:00 dec +00:00:00 secz 1.4
* Midpoint standards UT Date = '2018/12/16 04:30' Local time = 01:30 SDSSJ0200-0000 ra 02:00:00 dec +00:00:00 secz 1.9
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 but two 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 MACSJ0416_z_2 script in /usr/remote/user/DECamObserver/ExposureScripts/DES_script/MACSJ0416_z_2.json. This is a deep field with good spectroscopy for photo-z calibration. Estimate this will take about 1 hour.
2. If seeing is still <1.1" in i-band, execute MACSJ0416_z_1 script; if seeing < 1.3" and sky is clear, execute up to 2 photosweep (about 1 hour each). Instructions on creating photosweep scripts are below.
3. If seeing >1.3" and sky is not clear, excute E2 narrowband script up to an hour.
4. Execute Obstac starting after 02:01 UT (23:01 PM local time), expecting to do the 6 remaining z-band exposures.
5. If seeing is <1.1" in i-band and sky is clear, excute the MACSJ0416_i_1 script for about an hour.
6. If seeing is <1.3" in i-band and sky is clear, excute photosweeps if more than 30 minutes left; if less than 30 minutes left, continue with OBSTAC.
Clear for photosweeps means no clouds. Rasicam, or going outside and looking at the sky.
Clear for MACS field is clear or nearly so.
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.
Priorities (highest to lowest)¶
1. Be prepared for a GW follow-up interruption. No alert at time of 4pm Meeting, but it is still a possibility