A Reference Survey
Summary Statistics
Duration |
10 years |
Total visits |
2,685,127 |
Visit length |
34 seconds (2x15s exposure, 2x1s shutter, 1 readout) |
Average slew time |
6.4 seconds |
Ratio of observe + slew time to possible observe time |
0.739667 |
Number of nights with no observations |
397 |
Proposal Statistics
| Deep Wide Survey | 20,000 square degrees to a uniform depth of u: 26.5 g: 27.4 r: 27.5 i: 26.9 z: 26.1 y: 24.9 |
| Northern Ecliptic | 3300 square degrees ~2.1 pairs per lunation |
Deep-Drilling |
70 square degrees 154 sequences of 100 days with > 85% of the requested observations |
| Galactic Plane | 1700 square degrees to uniform depth of u: 26.1 g: 26.5 r: 26.1 i: 25.6 z: 24.9 y: 23.5 |
| South Pole | 1700 square degrees to a uniform depth of u: 25.5 g: 26.4 r: 26.0 i: 25.3 z: 25.0 y:23.4 |
Depth
The 5 sigma coadded limiting magnitude (or depth) in each filter for each field is plotted in Aitoff projection for a 10-year simulated survey with the five proposals described above. The 20,000 square degrees between -68 and +8 declination (excluding the crowded regions near the Galactic center) have limiting magnitudes of 26.5, 27.4, 27.5, 26.9, 26.1 and 24.9 in u, g, r, i, z, and y respectively.
Pairs of Visits
Showing the distribution of pairs of visits that are separated by 15 to 60 minutes per lunation, this plot is a figure of merit for determining asteroid orbits. There were 933,767 non-overlapping pairs in g, r, i, & z, yielding ~6 pairs per lunation for most of the survey area. Three pairs per lunation is needed to determine an orbit well enough to recover the object at a later time.
Source: American Astronomical Society 213th Meeting, Poster Exhibit, "LSST: Cadence Design and Simulation", K.H. Cook et al., 460.04