Opsim and MAF Metrics Lynne Jones Opsim and MAF metrics Call for - PowerPoint PPT Presentation

Opsim and MAF Metrics Lynne Jones

Opsim and MAF metrics Call for white papers on LSST survey strategy • The call - https://ls.st/c66 • White papers need method to evaluate survey strategy effectiveness for specific science goal: metrics (MAF metrics) • For moving objects, this generally requires a step beyond simulating survey strategy (Opsim output): need to simulate observations of a population of small bodies • Then can evaluate metrics, based on those observations � 2

OpSim, sims_movingObjects, & MAF Operations Simulation (OpSim) generates simulated pointing histories under realistic conditions. (Scheduler in OpSim will be the LSST scheduler). sims_movingObjects takes a set of orbits and generates the observations LSST would acquire MAF analyzes these observations and applies a “metric” to all observations of the same object. (MAF can clone obs/orbit over range of H values). � 3

Example: Discovery / Completeness Step 1 - opsim (survey strategy) • A particular survey strategy results in a simulated pointing history (generated with OpSim - LSST scheduler) Sample subset of columns from Opsim output database � 4

Example: Discovery / Completeness Step 2 - generate moving object observations (sims_movingObjects) • Given a set of orbital parameters, sims_movingObjects can generate observations of those objects Sample subset of columns from sims_movingObjects output observation file Documentation (temporary home): http://ls.st/5kj � 5

Example: Discovery / Completeness Step 3 - MAF metric • MAF metric evaluates chance of discovery (per orbit, assuming a particular H value — or range of H values). • MAF metric only has to deal with evaluating X after being handed the observations for a given orbit, at a given H value • Metric output is saved; can then be summarized and visualized across different axes • Discovery chance as a function of orbital parameters (at a given H value) • Discovery chance as a function of H value (taking median/mean/etc across orbital parameters of the population) • For something like discovery: also can summarize as completeness across population as a function of H Documentation: https://sims-maf.lsst.io/ � 6

Example: Discovery / Completeness Analysis (different populations, baseline survey strategy) � 7

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).

Example: Discovery / Completeness Analysis (many runs) � 9

Example: Discovery / Completeness Analysis (many runs) � 10

Example: Discovery / Completeness Analysis (many runs) � 11

Example: Discovery / Completeness Analysis (many runs) - Tools to evaluate effect of varying survey strategy � 12

Example: Discovery / Completeness (what’s up with the single visits run? colossus_2667) Fewer chances for discovery, NVisits per night, but still have capability including overlaps NVisits per night, without overlaps This is all due to field overlaps! Run was configured for single visits per night. Note that amount of overlap will depend on field tessellation and visit sequence. � 13

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).

LSST Survey Strategy Survey Strategy must be defined with input from the community. • LSST Call for White Papers on Survey Strategy: http://ls.st/c66 Survey strategy can be improved beyond current reference but there are open questions as to how. Snaps (2x15 or 1x30)? WFD cadence? NES footprint & cadence? Pairs in same or different filters? No pairs at all? New mini surveys for other purposes? WHITE PAPERS UNDERWAY Contact Meg / LSST-SSSC 15 �

Resources/Links • Call for white papers http://ls.st/c66 • Questions/discussions about call/white papers/etc: community forum • https://community.lsst.org/c/sci/survey-strategy • Standard MAF outputs http://astro-lsst-01.astro.washington.edu:8080/ • Moving Object Metrics (NEO, MBA, TNO) to be added shortly • Comparisons between MAF outputs http://ls.st/blm • Moving Object Metrics (NEO, MBA, TNO) to be added shortly • opsim documentation https://lsst-sims.github.io/sims_ocs/ • sims_movingObjects documentation http://ls.st/5kj • sims_maf (MAF) documentation https://sims-maf.lsst.io/ � 16

2018 April 2018 June 2018 Aug 2018 Nov 2018 Jan 2018 Feature based New LSST scheduler baseline AHM runs run Submission Call issued Deadline 2019 June 2019 April 2019 Aug 2019 Nov 2019 Jan 2019 Scripted Scheduler FBS Scheduler LSST + CSC for + CSC for AHM AuxTel ComCam Simulations being created & evaluated Simulated Announce list 2020 - SSC review surveys of simulations 2021 - Baseline survey strategy released 2022 - Start of operations