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Occultation Predictions and Web Presentation in Essen - KPT 2015

Learn about Sternbedeckungen durch Kleinplaneten Vorhersagen und die Präsentation im Web by Mike Kretlow at KPT 2015 in Essen. Discover producers of occultation predictions, non-public software, accurate perturbed ephemeris of asteroids, workflow and tool chain, web framework, constraints and properties, and future prospects.

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Occultation Predictions and Web Presentation in Essen - KPT 2015

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  1. Sternbedeckungen durch KleinplanetenVorhersagen und die Präsentation im Web Mike Kretlow – KPT 2015 in Essen

  2. Producers of occultation predictions • Win-App OCCULT by Dave Herald (AU). • Steve Preston (USA). • Other contributors and (local) coordinators, preparing and selecting events, web presentation etc. • Edwin Goffin (BE / EAON). Non-public software. PDF. • Mike Kretlow (DE / IOTA-ES). Non-public software. WebApp. • Andrey Plekhanov (RUS), LinOccult.

  3. Workflow and tool chain (1) Planets & MassesJPL DE421 Perturbing asteroidsChebyshev polynomials Asteroid Elementsastorb.dat Accurate perturbed ephemeris of all asteroids (e.g. 1 yr) PEE  F95 (Subset), binary RA ordered ODE solver: Multistep, variable order, predictor-corrector, self-adjusting step-size UCAC4 Eventfiles Logfiles Summary files Bessel elements (CSV File) SSO F95 DB Table:Events Perl script ARIHIP URAT1 … GUI App (Python)

  4. Workflow (2) and WebApp DB Caching Session IDs … Web Framework Django (Python) Model-View-Controller-------------------------- WebApp Code JavaScript Libs & Plugins Web Server nginx DB Events Suppl. Data (User Data) Perl Script Internet Meta-Data DAMIT models MPC sites, etc. External Services GIS (map data) Aladin / VizieR

  5. Constraints and properties • Asteroids with mean diameter > 20 km • Stars brigther 14 mag (SPM: 13 mag) • Occ. duration (from mean diam.) >= 1 sec • Elongation to Sun at least 30° • DB contains ~145000 events for 2015 • 7 star catalogs : ARIHIP (includes FK6, HIP, TYC-2), CMC15, SPM4, PPMX, UCAC2, UCAC4 and URAT1

  6. http://astro.kretlow.de

  7. Future prospects • Occult Watcher (OW) functionality • User, profiles and credentials management • Replace astorb.dat by batch driven on-the-fly computed orbits including debiasing etc. => better orbits (ephemeris), full error propagation • Combine occultation prediction DB (Bessel elements) with occultation reports (observations) DB => on-the-fly reduction and profile generation (ellipse fitting) • Technical changes (code sharing etc.)

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