Sky transparency — night reports

One self-contained report per imaging night, published from the observatory each morning: how much of a normal night got through, and which failures were the sky's fault. 32 nights so far, newest first.

October 2026

Wed 21–22 OctCloud arrived at 20:51 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 0 (IQR 0–0); after it 18 (IQR 0–86). 0 of 44 light frames landed…Index 0Cloud 20:51 Mon 19–20 OctCloud arrived at 03:56 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 87–104); after it 2 (IQR 0–4). 65 of 72 light frames landed…Index 100Cloud 03:56 Fri 16–17 OctNo cloud onset detected. The transparency index held at 100 (IQR 91–119) across 61 light frames. Guiding held at 1.06″ RMS (RA 0.72″, Dec 0.77″) over 5.9 h; the worst minute was…Index 100Clear all night Thu 15–16 OctCloud arrived at 23:58 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 0 (IQR 0–0); after it 0 (IQR 0–0). 9 of 9 light frames landed before…Index 0Cloud 23:58 Wed 14–15 OctCloud arrived at 05:39 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 79–106); after it 0 (IQR 0–0). 67 of 67 light frames landed…Index 100Cloud 05:39 Sat 10–11 OctCloud arrived at 21:11 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 87–102); after it 14 (IQR 1–70). 5 of 31 light frames…Index 100Cloud 21:11 Thu 8–9 OctCloud arrived at 20:43 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 0 (IQR 0–0); after it 96 (IQR 82–102). 0 of 31 light frames landed…Index 0Cloud 20:43 Wed 7–8 OctNo cloud onset detected. The transparency index held at 100 (IQR 95–101) across 53 light frames. Guiding held at 0.97″ RMS (RA 0.65″, Dec 0.73″) over 5.0 h; the worst minute was…Index 100Clear all night Tue 6–7 OctCloud arrived at 22:38 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 92–114); after it 98 (IQR 53–100). 19 of 46 light frames…Index 100Cloud 22:38 Mon 5–6 OctCloud arrived at 22:06 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 89–103); after it 100 (IQR 33–108). 15 of 33 light frames…Index 100Cloud 22:06 Sun 4–5 OctCloud arrived at 23:49 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 68–104); after it 0 (IQR 0–0). 21 of 21 light frames landed…Index 100Cloud 23:49

September 2026

Mon 28–29 SepCloud arrived at 22:45 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 90–111); after it 100 (IQR 44–115). 26 of 85 light frames…Index 100Cloud 22:45 Sun 27–28 SepCloud arrived at 19:33 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 100–100); after it 100 (IQR 79–107). 1 of 95 light frames…Index 100Cloud 19:33 Wed 23–24 SepCloud arrived at 20:56 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 90–106); after it 25 (IQR 3–77). 16 of 88 light frames…Index 100Cloud 20:56 Tue 22–23 SepCloud arrived at 22:51 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 85–127); after it 110 (IQR 6–128). 35 of 93 light frames…Index 100Cloud 22:51 Mon 21–22 SepCloud arrived at 20:49 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 92–103); after it 144 (IQR 127–162). 15 of 39 light frames…Index 100Cloud 20:49 Sat 19–20 SepCloud arrived at 19:15 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 0 (IQR 0–0); after it 69 (IQR 39–85). 0 of 81 light frames landed…Index 0Cloud 19:15 Thu 17–18 SepNo cloud onset detected. The transparency index held at 100 (IQR 17–109) across 80 light frames. Guiding held at 3.06″ RMS (RA 2.17″, Dec 2.15″) over 8.4 h; the worst minute was…Index 100Clear all night Sat 12–13 SepCloud arrived at 05:29 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 92–104); after it 0 (IQR 0–0). 67 of 67 light frames landed…Index 100Cloud 05:29 Fri 11–12 SepNo cloud onset detected. The transparency index held at 100 (IQR 91–104) across 81 light frames. Guiding held at 0.76″ RMS (RA 0.60″, Dec 0.47″) over 7.6 h; the worst minute was…Index 100Clear all night Thu 10–11 SepCloud arrived at 21:14 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 89 (IQR 87–92); after it 90 (IQR 15–116). 2 of 68 light frames…Index 89Cloud 21:14 Mon 7–8 SepCloud arrived at 19:22 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 94 (IQR 90–98); after it 91 (IQR 64–108). 2 of 86 light frames…Index 94Cloud 19:22 Thu 3–4 SepCloud arrived at 21:20 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 87–101); after it 72 (IQR 49–104). 20 of 97 light frames…Index 100Cloud 21:20 Wed 2–3 SepCloud arrived at 03:46 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 87–106); after it 58 (IQR 13–77). 62 of 79 light frames…Index 100Cloud 03:46

August 2026

Mon 31 Aug – 1 SepCloud arrived at 01:12 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 93–107); after it 36 (IQR 36–36). 56 of 57 light frames…Index 100Cloud 01:12 Sun 30–31 AugCloud arrived at 22:48 — detected by the all-sky camera, independent of N.I.N.A. Before it the sky ran at index 100 (IQR 89–105); after it 29 (IQR 3–55). 31 of 33 light frames…Index 100Cloud 22:48 Mon 17–18 AugNo cloud onset detected. The transparency index held at 100 (IQR 84–116) across 43 light frames. Guiding held at 0.73″ RMS (RA 0.48″, Dec 0.55″) over 4.7 h; the worst minute was…Index 100Clear all night Sun 2–3 AugNo cloud onset detected. The transparency index held at 100 (IQR 93–112) across 40 light frames. Guiding held at 0.66″ RMS (RA 0.47″, Dec 0.46″) over 3.8 h; the worst minute was…Index 100Clear all night Sat 1–2 AugNo cloud onset detected. The transparency index held at 100 (IQR 71–116) across 62 light frames. Guiding held at 0.83″ RMS (RA 0.62″, Dec 0.55″) over 12.2 h; the worst minute was…Index 100Clear all night

July 2026

Mon 27–28 JulNo cloud onset detected. The transparency index held at 0 (IQR 0–0) across 0 light frames.Index 0Clear all night

June 2026

Sun 28–29 JunNo cloud onset detected. The transparency index held at 100 (IQR 34–350) across 33 light frames. The 23:58 autofocus run fitted its curve on almost no stars and should not be…Index 100Clear all night Sun 14–15 JunNo cloud onset detected. The transparency index held at 100 (IQR 93–100) across 19 light frames.Index 100Clear all night

Reports are generated by skyq from the N.I.N.A. log and the all-sky camera. Transparency is advisory only.