White Paper Runs Name Description baseline2018a Baseline Project-official baseline (official opsim v4 baseline, 6/2018). No dome crawl. kraken_2026 Next baseline Unofficial baseline (expected next baseline, including dome crawl). Comparison point for WP run simulations. colossus_2665 Bigger baseline Baseline style, with slightly expanded WFD footprint to better satisfy SRD constraints on fO colossus_2664 No GP No separated Galactic Plane proposal. Simply run WFD over galactic plane region. colossus_2667 Single visits Survey with single visits only. Standard visits in pairs each night replaced with single visits per night. pontus_2489 Short visits Survey with more visits. Standard 2x15s visits replaced with 1x20s in grizy and 1x40s in u band. kraken_2042 No snaps Survey without snaps (single 30s exposures per visit). kraken_2035 9 DDF Survey with 9 DD mini surveys instead of 5. Addition of 4 extra extragalactic DD fields. mothra_2045 Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout entire survey. A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout the entire pontus_2502 Rolling (2) survey, but the background WFD remains "on" at a 25% reward level. A rolling cadence in WFD. Three regions of declination, alernating on/off every third year from years 3-8. Standard kraken_2036 Rolling (3) WFD coverage in years 1-2, 8-10 (first two and last two years). pontus_2002 PS style Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields). ("PS style"). Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields) ["PS style"] but with single visits per kraken_2044 PS - Single visits night. A rolling cadence on a very large WFD footprint (24,700 sq deg). Two regions of declination, alternating on/off mothra_2049 PS - Rolling (2) every other year throughout entire survey. A rolling cadence on a very large WFD footprint (24,700 sq deg). Three regions of declination, alternating on/off nexus_2097 PS - Rolling (3) every third year from years 3-8. Full WFD coverage in years 1-2, 8-10 (first and last two years).
Baseline Footprint and mini-survey distribution
SRD Statistics: fO Requirement to cover 18,000 sq deg with median Nvisits=825 rolling cadence + PS style runs rolling cadence + PS style runs fONv - number of visits over 18,000 sq deg area fOArea - amount of area that receives at least 825 visits MEETING NAME - DATE - LOCATION � 3
SRD Statistics: Parallax and proper motion Requirement: PM error < 1mas/yr, parallax error < 3mas MEETING NAME - DATE - LOCATION � 4
SRD Statistics: Parallax and proper motion Requirement: Uniform rapid revisits (40s-20minutes) over 2,000 sq deg MEETING NAME - DATE - LOCATION � 5
Time in WFD Time spent in WFD = 1 - time spent in mini surveys PS style runs: only DD as non-WFD MEETING NAME - DATE - LOCATION � 6
White Paper Runs - visit exposure time Name Description baseline2018a Baseline Project-official baseline (official opsim v4 baseline, 6/2018). No dome crawl. kraken_2026 Next baseline Unofficial baseline (expected next baseline, including dome crawl). Comparison point for WP run simulations. colossus_2665 Bigger baseline Baseline style, with slightly expanded WFD footprint to better satisfy SRD constraints on fO colossus_2664 No GP No separated Galactic Plane proposal. Simply run WFD over galactic plane region. colossus_2667 Single visits Survey with single visits only. Standard visits in pairs each night replaced with single visits per night. pontus_2489 Short visits Survey with more visits. Standard 2x15s visits replaced with 1x20s in grizy and 1x40s in u band. kraken_2042 No snaps Survey without snaps (single 30s exposures per visit). kraken_2035 9 DDF Survey with 9 DD mini surveys instead of 5. Addition of 4 extra extragalactic DD fields. mothra_2045 Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout entire survey. A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout the entire pontus_2502 Rolling (2) survey, but the background WFD remains "on" at a 25% reward level. A rolling cadence in WFD. Three regions of declination, alernating on/off every third year from years 3-8. Standard kraken_2036 Rolling (3) WFD coverage in years 1-2, 8-10 (first two and last two years). pontus_2002 PS style Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields). ("PS style"). Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields) ["PS style"] but with single visits per kraken_2044 PS - Single visits night. A rolling cadence on a very large WFD footprint (24,700 sq deg). Two regions of declination, alternating on/off mothra_2049 PS - Rolling (2) every other year throughout entire survey. A rolling cadence on a very large WFD footprint (24,700 sq deg). Three regions of declination, alternating on/off nexus_2097 PS - Rolling (3) every third year from years 3-8. Full WFD coverage in years 1-2, 8-10 (first and last two years).
Visit exposure time Why change exposure time? • u band (and g band) exposures are read noise limited at 15s • can save 8% of time / visit by going to single exposure / visit • small changes in exposure time can change number of visits dramatically 2x15s visits 1xTs visits u band transitions between read noise & sky limited � 8
Visit exposure time No snaps (1x30s exp/visit) gains 7% more visits, with no drop (even small increase) in coadded depth � 9
Visit exposure time No snaps: costs • Trailed moving objects lose “direction” information in a single visit • TAI midpoint of the exposure (time of visit) is a function of position in the focal plane (1s shutter open/close) Soliciting (mini) white papers addressing snaps / no snaps issue, or white papers addressing general exposure time questions. � 10
White Paper Runs - Rolling Cadence Runs Name Description baseline2018a Baseline Project-official baseline (official opsim v4 baseline, 6/2018). No dome crawl. kraken_2026 Next baseline Unofficial baseline (expected next baseline, including dome crawl). Comparison point for WP run simulations. colossus_2665 Bigger baseline Baseline style, with slightly expanded WFD footprint to better satisfy SRD constraints on fO colossus_2664 No GP No separated Galactic Plane proposal. Simply run WFD over galactic plane region. colossus_2667 Single visits Survey with single visits only. Standard visits in pairs each night replaced with single visits per night. pontus_2489 Short visits Survey with more visits. Standard 2x15s visits replaced with 1x20s in grizy and 1x40s in u band. kraken_2042 No snaps Survey without snaps (single 30s exposures per visit). kraken_2035 9 DDF Survey with 9 DD mini surveys instead of 5. Addition of 4 extra extragalactic DD fields. mothra_2045 Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout entire survey. A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout the entire pontus_2502 Rolling (2) survey, but the background WFD remains "on" at a 25% reward level. A rolling cadence in WFD. Three regions of declination, alernating on/off every third year from years 3-8. Standard kraken_2036 Rolling (3) WFD coverage in years 1-2, 8-10 (first two and last two years). pontus_2002 PS style Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields). ("PS style"). Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields) ["PS style"] but with single visits per kraken_2044 PS - Single visits night. A rolling cadence on a very large WFD footprint (24,700 sq deg). Two regions of declination, alternating on/off mothra_2049 PS - Rolling (2) every other year throughout entire survey. A rolling cadence on a very large WFD footprint (24,700 sq deg). Three regions of declination, alternating on/off nexus_2097 PS - Rolling (3) every third year from years 3-8. Full WFD coverage in years 1-2, 8-10 (first and last two years).
Rolling cadence Scheduling rolling cadence in alternating dec bands inefficient with our current implementation of mini surveys. (decrease in # of visits is due to longer slew times to reach mini survey fields) � 12
Rolling cadence More visits (either overall or compressed into a short time period) make it easier to revisit fields sooner. Rolling cadence (with ‘background’ observations) can still do a bad job. What are the intervals which really matter? Any filter? Particular pairs? � 13
Rolling cadence Season length: primarily affected by choices to observe fields near meridian. These rolling cadences affect season length, but this is likely due to cutoffs when switching declination bands from year to year. � 14
Rolling cadence Season length: primarily affected by choices to observe fields near meridian. (compare against minion_1016). This will also affect inter-night revisit rate. � 15
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