{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2026-04-20","schedule":[{"end":"2026-04-20T22:00Z","end_local":"01:00","hours":4.92,"mean_quality":0.0,"start":"2026-04-20T17:05Z","start_local":"20:05","target":null},{"end":"2026-04-21T01:15Z","end_local":"04:15","hours":3.25,"mean_quality":0.78,"start":"2026-04-20T22:00Z","start_local":"01:00","target":"3C 273"},{"end":"2026-04-21T03:35Z","end_local":"06:35","hours":2.33,"mean_quality":0.0,"start":"2026-04-21T01:15Z","start_local":"04:15","target":null}],"targets":[{"best_window":{"end":"2026-04-21T00:50Z","end_local":"03:50","hours":2.83,"label":"good","mean_quality":0.83,"start":"2026-04-20T22:00Z","start_local":"01:00"},"dec":2.05238823,"moon_separation":106.7,"name":"3C 273","quality_hours":2.98,"ra":187.27791594,"resolved":{"dec":2.05238823,"morphology":"E3","name":"3C 273","ra":187.27791594,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=3C%20273","source":"sesame","type":"BLL","type_text":"BL Lac object \u2014 a blazar","vmag":14.83},"score":48,"score_astronomy":93,"score_weather":52,"transit":{"airmass":1.3,"alt":50.2,"az":179.7,"t":"2026-04-20T20:55Z"},"verdict":"marginal","weather_known":true,"windows":[{"end":"2026-04-20T20:00Z","end_local":"23:00","hours":2.92,"label":"unusable","mean_quality":0.0,"start":"2026-04-20T17:05Z","start_local":"20:05"},{"end":"2026-04-20T22:00Z","end_local":"01:00","hours":2.0,"label":"poor","mean_quality":0.21,"start":"2026-04-20T20:00Z","start_local":"23:00"},{"end":"2026-04-21T00:50Z","end_local":"03:50","hours":2.83,"label":"good","mean_quality":0.83,"start":"2026-04-20T22:00Z","start_local":"01:00"},{"end":"2026-04-21T01:15Z","end_local":"04:15","hours":0.42,"label":"marginal","mean_quality":0.49,"start":"2026-04-21T00:50Z","start_local":"03:50"},{"end":"2026-04-21T03:35Z","end_local":"06:35","hours":2.33,"label":"unusable","mean_quality":0.0,"start":"2026-04-21T01:15Z","start_local":"04:15"}]}],"unscheduled":[],"warnings":[]}