**Note, edited after bug fix. Slightly more optimistic values now**

HI all. We have added a computation of the expected coadded limiting surface brightness magnitudes in each filter to the standard set of metrics we run on each simulated observing cadence. A full tech note doing the math can be found here: https://smtn-016.lsst.io/

The end result is that the median 3-sigma surface brightness limits for a 10x10 arcsec area in our current baseline survey strategy after 10 years is:

filter | # 30s visits | coadded 3-sigma depth mag/sq arcsec |
---|---|---|

u | 54 | 29.4 |

g | 69 | 30.3 |

r | 179 | 30.3 |

i | 182 | 29.7 |

z | 159 | 28.9 |

y | 166 | 28.1 |

Note that some recent cadence white papers claimed Rubin would get deeper than 30.5 mag/ sq arcsec in some filters. This value is overly optimistic, possibly assuming we would obtain 825 visits in each filter rather than summed over all filters.