Changes between Version 13 and Version 14 of PublicPages/MayallZbandLegacy/NotesforObservers/Copilot
- Timestamp:
- Mar 10, 2016 2:03:38 PM (9 years ago)
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PublicPages/MayallZbandLegacy/NotesforObservers/Copilot
v13 v14 84 84 * (unlabelled bar) -- it has been a while since the last image has been seen. Have images stopped being written? See problem description [[https://desi.lbl.gov/trac/wiki/PublicPages/MayallZbandLegacy/NotesforObservers/Problems#a0.Noimagesbeingwritten here]] 85 85 86 87 86 The second panel shows the Sky brightness. The "nominal" brightness 88 87 is shown by the magenta horizontal line. In this panel, the pass … … 95 94 clear photometric conditions. 96 95 97 The "exposure time" panel is complicated. The hollow blackdots show98 the actual exposure time of the images we took. The magenta dots show96 The "exposure time" panel is complicated. The filled magenta dots show 97 the actual exposure time of the images we took. The black circles show 99 98 the exposure time we should have taken, given the measured conditions 100 99 in that image; it's post-facto what we should have done. We have … … 102 101 the "post-facto" target exposure time is below or above the bounds, it 103 102 is shown with a triangle, and a circle will also be plotted at the 104 lower or upper bound line. 103 lower or upper bound line. Obviously triangles above the upper bound indicate images that might not be as deep as desired. Triangles below the lower bound are also a concern since observing time is scarce. 105 104 106 The "depth factor" plot just shows our actual exposure time divided by105 **[depth factor has been removed from the plot. This description is useful when looking at plots created before about February 2016]** The "depth factor" plot just shows our actual exposure time divided by 107 106 the post-facto target exposure time. 1 indicates that we're doing 108 107 exactly what we should be doing. Greater than 1 indicates we're … … 110 109 The vertical labels show the exposure numbers. 111 110 111 The final panel is a strip chart showing the RA and DEC offsets from tile center determined post facto. When offsets are greater than a total of 10'', the telescope zero point should be updated. Pointing and tracking are currently excellent at the Mayall. 112 112 113 113 Note that zeros will not show up on the plot. The times of focus frames will be marked with a black dot labelled "F".
