{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2026-05-18","schedule":[{"end":"2026-05-19T03:00Z","end_local":"06:00","hours":9.42,"mean_quality":0.0,"start":"2026-05-18T17:35Z","start_local":"20:35","target":null}],"targets":[{"best_window":null,"dec":2.05238823,"moon_separation":97.6,"name":"3C 273","quality_hours":0.05,"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":1,"score_astronomy":81,"score_weather":1,"transit":{"airmass":1.3,"alt":50.2,"az":179.8,"t":"2026-05-18T19:05Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2026-05-18T18:10Z","end_local":"21:10","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-05-18T17:35Z","start_local":"20:35"},{"end":"2026-05-18T19:00Z","end_local":"22:00","hours":0.83,"label":"poor","mean_quality":0.06,"start":"2026-05-18T18:10Z","start_local":"21:10"},{"end":"2026-05-19T03:00Z","end_local":"06:00","hours":8.0,"label":"unusable","mean_quality":0.0,"start":"2026-05-18T19:00Z","start_local":"22:00"}]}],"unscheduled":[{"name":"3C 273","why":"Overcast (\u226580 % cloud) for 6.5 of 8.3 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}