Pre-night briefing report for dayobs 20260727 compaing different simulations for the simonyi telescope, simulated on 2026-07-27¶
In the morning before each night of observing, a small suite of Rubin (FBS) scheduler simulations for the upcomming night are run. These in include at least one simulation with ideal weather and the telescope following the scheduler's model of it exactly, plus a handful of variations with differing weather and/or scheduler behavior. This report given an overview of the differences between the different simulations in this pre-night set of simulations.
A separate report, the prenight simulation report, describes the nominal/ideal simulation in more detail.
Sunset: 22:03:05Z, evening 12°: 23:01:47Z, morning 12°: 10:37:02Z, Sunrise: 11:35:38Z
| MJD | LST | UTC | Chile/Continental | |
|---|---|---|---|---|
| event | ||||
| sunset | 61248.918815 | 205.622288 | 2026-07-27 22:03:05.630764+00:00 | 2026-07-27 18:03:05.630764-04:00 |
| sun_n12_setting | 61248.959576 | 220.336203 | 2026-07-27 23:01:47.328098+00:00 | 2026-07-27 19:01:47.328098-04:00 |
| sun_n18_setting | 61248.979433 | 227.504415 | 2026-07-27 23:30:23.001471+00:00 | 2026-07-27 19:30:23.001471-04:00 |
| sun_n18_rising | 61249.422555 | 27.465328 | 2026-07-28 10:08:28.794531+00:00 | 2026-07-28 06:08:28.794531-04:00 |
| sun_n12_rising | 61249.442388 | 34.624456 | 2026-07-28 10:37:02.293706+00:00 | 2026-07-28 06:37:02.293706-04:00 |
| sunrise | 61249.483083 | 49.314826 | 2026-07-28 11:35:38.355504+00:00 | 2026-07-28 07:35:38.355504-04:00 |
| moonrise | 61249.892496 | 197.107134 | 2026-07-28 21:25:11.658186+00:00 | 2026-07-28 17:25:11.658186-04:00 |
| moonset | 61249.455194 | 39.247303 | 2026-07-28 10:55:28.747371+00:00 | 2026-07-28 06:55:28.747371-04:00 |
| night_middle | 61249.200949 | 307.468557 | 2026-07-28 04:49:21.993134+00:00 | 2026-07-28 00:49:21.993134-04:00 |
Sun α=127.0°, δ=19.0° Moon α=291.0°, δ=-25.0°
| RA | dec | alt | az | phase | |
|---|---|---|---|---|---|
| sun | 127.127693 | 19.065834 | -78.615629 | 177.171564 | NaN |
| moon | 290.950109 | -25.348194 | 75.096680 | 287.751198 | 90.986217 |
Simulations available¶
Pre-night simulations are saved in an archive.
The table of visits themselves (and optional additional data) are stored in an S3 bucket. Metadata on the simulations can be queried in a separate postgresql database. Limited metadata information can also be found in the S3 bucket itself for those with access to the S3 bucket but not the postgresql database.
Simulations in the archive can be identified in two different ways:
- A unique UUID is assigned to each simulation when it is added to the archive.
- Each simulation can also be identified be a combination of the date on which it was added to the archive and a sequential identifier for that day. (These sequential identifiers are shared by the auxtel and simonyi telescopes, so the list of indexes for one of the telescopes may not start at one, and may not be sequential.)
Although the archive may contain simulations run for any night for any time, this page only includes simulations of on night, made on one date (the morning prior).
Additional details can be found in "Visit Sequence Archive" sections of the rubin-sim documentation.
Simulation identifiers¶
| id | simulation | tags | |
|---|---|---|---|
| visitseq_uuid | |||
| 2762ae62-37bd-43a9-988f-7de56a5cfbc0 | 2 | Nominal start and overhead, ideal conditions, run at 2026-07-27T08:01:35-07:00 | [ideal, nominal, prenight] |
| 4ca7a2d7-eb14-473b-9ea8-bfe1350954a7 | 3 | Nominal start and overhead, ideal conditions, run at 2026-07-27T08:05:11-07:00 | [ideal, nominal, prenight, rewards] |
| 367d179a-a917-4e7a-9653-a6ec45d451e9 | 4 | Start time delayed by 240 minutes, nominal slew and visit overhead, ideal conditions, run at 2026-07-27T08:13:41-07:00 | [delay_240, ideal, prenight] |
Simulation data sources
| URI | ||
|---|---|---|
| sim_index | data | |
| 2 | visits | s3://rubin:rubin-scheduler-prenight/opsim/vseq/simonyi/2026-07-27/2762ae62-37bd-43a9-988f-7de56a5cfbc0/visits.h5 |
| 3 | visits | s3://rubin:rubin-scheduler-prenight/opsim/vseq/simonyi/2026-07-27/4ca7a2d7-eb14-473b-9ea8-bfe1350954a7/visits.h5 |
| rewards | s3://rubin:rubin-scheduler-prenight/opsim/vseq/simonyi/2026-07-27/4ca7a2d7-eb14-473b-9ea8-bfe1350954a7/rewards.h5 | |
| 4 | visits | s3://rubin:rubin-scheduler-prenight/opsim/vseq/simonyi/2026-07-27/367d179a-a917-4e7a-9653-a6ec45d451e9/visits.h5 |
Map of visits¶
Map key and instructions
The above plots show the visits collected during the night in two different representations, modeled after physical observing tools.
- The map on the left shows the sphere in orthographic projection, with the center point of the projection controlled by the sliders beneath the plot. A static orthogrophic projection is not an equal-area projection, but playing with the sliders is a helpful way to inform a human's spatial reasoning in three dimensions. Use of this map resembles use of an armillary sphere.
- The map on the right shows the sky in Lambert Azimuthal Equal Area Projection, centered at the south celestial pole, with R.A. increasing counterclockwise (because Rubin Observatory is in the southern hemisphere). The projection used is equal area, but highly distorted near the north celestial pole (outside the LSST footprint). This is a particularly helpful representation for planning observing, because changes in time in relevant features are simple rotations, without alterations in distortion, and there are no discontinuities anywhere in the footprint at any time of year. Use of this map resembles use of a planisphere.
Both plots show the footprints of camera pointing taken up to the time set by the "Date and Time" slider, with the most recent three pointings outlined in cyan. The fill colors are:
- u band
- g band
- r band
- i band
- z band
- y band
Both plots have the following additional annotations:
- The gray lines outline regions in the LSST survey.
- The orange disk shows the coordinates of the moon.
- The yellow disk shows the coordinates of the sun.
- The green line (oval) shows the ecliptic.
- The sun moves along the ecliptic in the direction of increasing R.A. (counter-clockwise in the planisphere figure) such that it makes a full revolution in one year.
- The moon moves roughly (within 5.14°) along the ecliptic in the direction of increasing R.A. (counter-clockwise in the planisphere figure), completing a full revolution in one sidereal month (a bit over 27 days), about 14° per day.
- The blue line (oval) shows the plane of the Milky Way.
- The black line shows the horizon at the time set by the MJD slider.
- The red line shows a zenith distince of 70& deg; (airmass=2.9) at the time set by the MJD slider.
Often repeated fields¶
An often repeated field is a field repeated at least 5 times in at least one simulation, where a "field" is a unique combination field coordinates and filter.
No fields were simulated 5 or more times
Counts of common fields and statistics of offsets between corresponding visits¶
Each table below compares one pre-night simulation (the reference simulations) to each of the other simulations (comparison simulations). The tables have the following columns:
- label is the text label assigned to the comparison simulation in the simulation archive.
- ref count is the total number of visits in the reference simulation.
- comparison count is the total number of visits in the to which that row compares the reference.
- match count is the number of visits the reference and completed have in common, where visits are matched by band and coordinates. When multiple visits are completed at the same band/pointing combination, the number of matches is the lesser of the number of times it was completed and the number of times it was simulated. For example, if a band/pointing appears 5 times in the simulation but was completed 3 times, it would count as 3 matches.
- #match/#ref is the ratio of match count to ref count, as defined above.
- #match/#comp is the ratio of match count to comparson count, as defined above.
The remaining columns show the statistics for offsets between the start times in the comparsion simulations from those reference (including only those visits with matches). (MAD is the median absolute deviation, the median of the absolute value of the offsets.)
Comparison to sim 2: Nominal start and overhead, ideal conditions, run at 2026-07-27T08:01:35-07:00¶
| label | ref count | comparison count | match count | #match/#ref | #match/#comp | MAD | mean | std | min | 25% | 50% | 75% | max | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sim_index | ||||||||||||||
| 3 | Nominal start and overhead, ideal conditions, run at 2026-07-27T08:05:11-07:00 | 1096 | 1096 | 1096 | 1.00 | 1.00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 |
| 4 | Start time delayed by 240 minutes, nominal slew and visit overhead, ideal conditions, run at 2026-07-27T08:13:41-07:00 | 1096 | 716 | 568 | 0.52 | 0.79 | 0:13:42 | 0:04:00 | 0:50:35 | -2:49:36 | 0:01:49 | 0:12:33 | 0:22:12 | 4:13:50 |
Comparison to sim 3: Nominal start and overhead, ideal conditions, run at 2026-07-27T08:05:11-07:00¶
| label | ref count | comparison count | match count | #match/#ref | #match/#comp | MAD | mean | std | min | 25% | 50% | 75% | max | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sim_index | ||||||||||||||
| 2 | Nominal start and overhead, ideal conditions, run at 2026-07-27T08:01:35-07:00 | 1096 | 1096 | 1096 | 1.00 | 1.00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 | 0:00:00 |
| 4 | Start time delayed by 240 minutes, nominal slew and visit overhead, ideal conditions, run at 2026-07-27T08:13:41-07:00 | 1096 | 716 | 568 | 0.52 | 0.79 | 0:13:42 | 0:04:00 | 0:50:35 | -2:49:36 | 0:01:49 | 0:12:33 | 0:22:12 | 4:13:50 |
Comparison to sim 4: Start time delayed by 240 minutes, nominal slew and visit overhead, ideal conditions, run at 2026-07-27T08:13:41-07:00¶
| label | ref count | comparison count | match count | #match/#ref | #match/#comp | MAD | mean | std | min | 25% | 50% | 75% | max | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sim_index | ||||||||||||||
| 2 | Nominal start and overhead, ideal conditions, run at 2026-07-27T08:01:35-07:00 | 716 | 1096 | 568 | 0.79 | 0.52 | 0:13:42 | -0:04:00 | 0:50:35 | -4:13:50 | -0:22:12 | -0:12:33 | -0:01:49 | 2:49:36 |
| 3 | Nominal start and overhead, ideal conditions, run at 2026-07-27T08:05:11-07:00 | 716 | 1096 | 568 | 0.79 | 0.52 | 0:13:42 | -0:04:00 | 0:50:35 | -4:13:50 | -0:22:12 | -0:12:33 | -0:01:49 | 2:49:36 |