Comparison of completed visits from dayobs 20260119 and the simulations of it completed on 2026-01-19¶
This report compares completed visits (as queried from the consdb) for a night to the pre-night simulated visits for that night.
It is similar to the report that displays multiple pre-night simulations for one night, but includes the completed visits as well.
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.
Visit parameter vs. time¶
The scalar visit parameter to plot can be chosen with the drop-down in the upper left.
The simulation with which completed visits should be compared can be selected from the drop-down at the top.
Timing plot¶
The timing plot plots the time "as observed" vs. the time "as simulated" where completed visits correspond to simulated ones.
The drop-down selects the simulation with which "as observed" is to be compared.
Common visits and offsets between them¶
| label | obs count | sim count | match count | #match/#obs | #match/#sim | MAD | mean | std | min | 25% | 50% | 75% | max | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sim_index | ||||||||||||||
| 2 | Nominal start and overhead, ideal conditions, run at 2026-01-19T07:03:57-08:00 | 469 | 602 | 75 | 0.16 | 0.12 | 0:29:08 | 0:59:15 | 1:02:10 | -0:26:00 | 0:11:39 | 0:29:08 | 2:01:44 | 3:36:18 |
| 3 | Nominal start and overhead, ideal conditions, run at 2026-01-19T07:10:10-08:00 | 469 | 602 | 49 | 0.10 | 0.08 | 1:33:10 | 1:28:49 | 0:57:05 | 0:14:03 | 0:29:02 | 1:33:10 | 2:13:21 | 3:36:13 |
| 4 | Start time delayed by 240 minutes, nominal slew and visit overhead, ideal conditions, run at 2026-01-19T07:25:26-08:00 | 469 | 330 | 26 | 0.06 | 0.08 | 0:47:11 | -0:07:47 | 1:07:59 | -1:57:04 | -1:22:03 | 0:14:10 | 0:46:34 | 0:51:08 |
| 5 | Anomalous overhead (101, 10.0), nominal start, ideal conditions, run at 2026-01-19T07:30:58-08:00 | 469 | 76 | 28 | 0.06 | 0.37 | 0:43:52 | -1:00:32 | 0:52:07 | -2:45:26 | -1:18:24 | -0:43:52 | -0:26:16 | -0:02:59 |
In the above table:
- label is the text label assigned to the simulation in the simulation archive.
- obs count is the total number of visits with blocks corresponding to survey science from ConsDB (the database of completed exposures).
- sim count is the total number of visits in the simulation for the night.
- match count is the number of visits the completed and simulations 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/#obs is the ratio of match count to obs count, as defined above.
- #match/#sim is the ratio of match count to sim count, as defived above.
The remaining columns show the statistics for offsets between the start times in simulation from those completed (including only those visits with matches). (MAD is the median absolute deviation, the median of the absolute value of the offsets.)