# New Observing Cadences available

**URL:** <https://www.rubin.community/t/new-observing-cadences-available/698>\
**Category:** Sims Announcements\
**Tags:** opsim\
**Created:** [April 19, 2016, 11:47pm UTC](https://www.rubin.community/t/new-observing-cadences-available/698 "2016-04-19T23:47:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ljones](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/ljones/32/1804_2.png) [@ljones](https://www.rubin.community/u/ljones)\
**Post date:** [April 19, 2016, 11:47pm UTC](https://www.rubin.community/t/new-observing-cadences-available/698/1 "2016-04-19T23:47:04Z")

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The standard “Tier 1” observing cadences, a set first run for the August 2015 All Hands Meeting, have been regenerated (and some additional runs created) using Opsim v3.3.5.  
The runs are listed, along with download links, here:  
[http://lsst.org/scientists/simulations/opsim/opsim-v335-benchmark-surveys](http://lsst.org/scientists/simulations/opsim/opsim-v335-benchmark-surveys)

These runs have been available for a few months, but their availability and the updates have not been widely announced.  
Changes between opsim v3.3.2 (the 2015 runs) and v3.3.5 include:

- schema changes to the seeing column (more information available at the link above)
- updates in the calculation of the m5 values, to better match updated estimates of the performance of the LSST optical system
- a change in the starting year of opsim, to 2022 (v3.3.2 used a generic time of 1993)

minion\_1016 is expected to become the new standard LSST baseline/reference run.