{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2026-05-21","schedule":[{"end":"2026-05-22T03:00Z","end_local":"06:00","hours":9.42,"mean_quality":0.0,"start":"2026-05-21T17:35Z","start_local":"20:35","target":null}],"targets":[{"best_window":null,"dec":22.71085365,"moon_separation":135.8,"name":"HD 189733","quality_hours":0.09,"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":2,"score_astronomy":97,"score_weather":2,"transit":{"airmass":1.06,"alt":71.1,"az":180.7,"t":"2026-05-22T02:25Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2026-05-21T20:55Z","end_local":"23:55","hours":3.33,"label":"unusable","mean_quality":0.0,"start":"2026-05-21T17:35Z","start_local":"20:35"},{"end":"2026-05-21T21:00Z","end_local":"00:00","hours":0.08,"label":"poor","mean_quality":0.2,"start":"2026-05-21T20:55Z","start_local":"23:55"},{"end":"2026-05-22T01:00Z","end_local":"04:00","hours":4.0,"label":"unusable","mean_quality":0.0,"start":"2026-05-21T21:00Z","start_local":"00:00"},{"end":"2026-05-22T02:00Z","end_local":"05:00","hours":1.0,"label":"poor","mean_quality":0.07,"start":"2026-05-22T01:00Z","start_local":"04:00"},{"end":"2026-05-22T03:00Z","end_local":"06:00","hours":1.0,"label":"unusable","mean_quality":0.0,"start":"2026-05-22T02:00Z","start_local":"05:00"}]}],"unscheduled":[{"name":"HD 189733","why":"no usable window tonight"}],"warnings":[]}