{"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":22.71085365,"moon_separation":120.3,"name":"HD 189733","quality_hours":0.18,"ra":300.18213726,"resolved":{"dec":22.71085365,"name":"HD 189733","ra":300.18213726,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD%20189733","source":"sesame","spectral_type":"K2V","type":"BY*","type_text":"BY Draconis variable \u2014 a spotted, rotating star","vmag":7.648},"score":5,"score_astronomy":94,"score_weather":5,"transit":{"airmass":1.06,"alt":71.1,"az":179.5,"t":"2026-05-19T02:35Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2026-05-19T00:00Z","end_local":"03:00","hours":6.42,"label":"unusable","mean_quality":0.0,"start":"2026-05-18T17:35Z","start_local":"20:35"},{"end":"2026-05-19T01:00Z","end_local":"04:00","hours":1.0,"label":"poor","mean_quality":0.18,"start":"2026-05-19T00:00Z","start_local":"03:00"},{"end":"2026-05-19T03:00Z","end_local":"06:00","hours":2.0,"label":"unusable","mean_quality":0.0,"start":"2026-05-19T01:00Z","start_local":"04:00"}]}],"unscheduled":[{"name":"HD 189733","why":"Overcast (\u226580 % cloud) for 6.5 of 8.3 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}