Sky transparency — night of 14–15 October 2026

Cloud 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 before the cloud. Guiding ran at 1.04″ RMS before the cloud and 0.58″ after; the worst minute was 3.50″ at 02:01. The 02:37 autofocus run fitted its curve on almost no stars and should not be trusted.

Index before 05:39
100 · IQR 79–106
Index after 05:39
0 · IQR 0–0
Cloud onset (all-sky)
05:39 · independent
Errors after onset
0 of 0 · solve + PHD2
Guide RMS
1.04″ · RA 0.71 · Dec 0.76

Normalised transparency index, by filter

100 = that target and filter's own clear‑sky median (this night's own pre-cloud median). Shaded columns are autofocus runs; the first target is named at the top left and dashed vertical rules mark each target change; ticks along the base are errors.

H α O III S II ▲ Plate solve failed ◆ PHD2 error
05010015020023:0000:0001:0002:0003:0004:0005:0006:00% of clear-sky medianclear-sky baselineM 17→ NGC 7293→ IC 434 Panel 3→ IC 434 Panel 2→ IC 434 Panel 1SHO

All‑sky background brightness

Mean luminance of the upper sky per all‑sky still — independent of anything N.I.N.A. recorded. The camera auto‑exposes, so this is an instrumental number, not photometry.

025507510023:0000:0001:0002:0003:0004:0005:0006:00Mean sky luminance (0–255)all-sky

PHD2 guiding

RMS tracking error per minute from the PHD2 guide log, taken about zero rather than about each minute's mean, so slow drift counts as error. 3936 guide frames over 6.6 h of guiding in 15 sessions; the gaps are slews, dither settles and autofocus runs, when PHD2 was not guiding. PHD2 discarded 4 further frames — usually a lost star. The worst minute (3.50″ at 02:01) is clamped at the top of the plot.

RA RMS Dec RMS ◆ PHD2 error
0.00.51.01.52.023:0000:0001:0002:0003:0004:0005:0006:00RMS guide error (arcsec)night RMS 1.04″RADec

All‑sky frames at the key moments

Times come from the still filenames, so they line up with the charts exactly.

All-sky at 22:05
22:05 · start of night
All-sky at 05:39
05:39 · cloud onset
All-sky at 05:41
05:41 · peak brightness 85.2
All-sky at 06:08
06:08 · end of night

Clear‑sky reference medians

The divisors behind the index — median detected stars per light sub before 05:39.

TargetFilterMedian starsFramesSource
IC 434 Panel 2H1994tonight, clear frames
IC 434 Panel 2O2334tonight, clear frames
IC 434 Panel 2S4394tonight, clear frames
IC 434 Panel 3H2094tonight, clear frames
IC 434 Panel 3O1974tonight, clear frames
IC 434 Panel 3S4674tonight, clear frames
NGC 7293H20616tonight, clear frames
NGC 7293O21115tonight, clear frames
NGC 7293S29512tonight, clear frames

Event timeline

All observatory events with their attributed causes.

AF failedautofocus run started 22:04:29 did not completeunexplained
AF rejectednew focus point HFR 2.6200145259991734 significantly worse than originalunexplained
All 216 frames
TimeClassTargetFilterExpStarsHFRIndex
22:05:50autofocusNGC 7293L5s1032.97—
22:06:06autofocusNGC 7293L5s1422.26—
22:06:21autofocusNGC 7293L5s2041.62—
22:06:36autofocusNGC 7293L5s1891.61—
22:06:51autofocusNGC 7293L5s1622.26—
22:07:11autofocusNGC 7293L5s1073.08—
22:07:31autofocusNGC 7293L5s664.71—
22:07:51autofocusNGC 7293L5s475.60—
22:08:11autofocusNGC 7293L5s943.15—
22:08:26autofocusNGC 7293L5s824.23—
22:08:46autofocusNGC 7293L5s1911.51—
22:15:16lightNGC 7293H300s2522.55122%
22:20:45lightNGC 7293H300s2482.57120%
22:22:46autofocusNGC 7293L5s1761.88—
22:23:01autofocusNGC 7293L5s486.27—
22:23:16autofocusNGC 7293L5s625.36—
22:23:31autofocusNGC 7293L5s863.84—
22:23:46autofocusNGC 7293L5s1112.59—
22:24:06autofocusNGC 7293L5s1971.69—
22:24:26autofocusNGC 7293L5s1881.58—
22:24:46autofocusNGC 7293L5s1801.95—
22:25:06autofocusNGC 7293L5s933.16—
22:25:21autofocusNGC 7293L5s614.01—
22:25:36autofocusNGC 7293L5s435.36—
22:25:56autofocusNGC 7293L5s1881.63—
22:33:08lightNGC 7293H300s2822.34137%
22:38:48lightNGC 7293H300s2612.47127%
22:44:58lightNGC 7293O300s2312.46109%
22:50:32lightNGC 7293O300s2382.43113%
22:56:08lightNGC 7293O300s2472.32117%
23:01:40lightNGC 7293O300s2362.41112%
23:07:26lightNGC 7293S300s2952.64100%
23:13:27lightNGC 7293S300s3362.36114%
23:18:57lightNGC 7293S300s3222.43109%
23:24:49lightNGC 7293S300s3122.48106%
23:30:44lightNGC 7293H300s1973.0296%
23:31:41autofocusNGC 7293L5s1681.61—
23:31:56autofocusNGC 7293L5s456.36—
23:32:11autofocusNGC 7293L5s634.55—
23:32:26autofocusNGC 7293L5s883.38—
23:32:41autofocusNGC 7293L5s1272.23—
23:33:01autofocusNGC 7293L5s1781.64—
23:33:21autofocusNGC 7293L5s1641.53—
23:33:41autofocusNGC 7293L5s1581.91—
23:34:01autofocusNGC 7293L5s933.07—
23:34:16autofocusNGC 7293L5s584.19—
23:34:31autofocusNGC 7293L5s475.28—
23:34:51autofocusNGC 7293L5s1781.48—
23:40:49lightNGC 7293H300s2822.28137%
23:46:45lightNGC 7293H300s2752.33133%
23:52:15lightNGC 7293H300s2802.33136%
23:57:57lightNGC 7293O300s2362.38112%
00:03:27lightNGC 7293O300s2282.44108%
00:08:59lightNGC 7293O300s2132.56101%
00:14:31lightNGC 7293O300s2112.54100%
00:20:24lightNGC 7293S300s3132.50106%
00:25:59lightNGC 7293S300s3002.55102%
00:31:35lightNGC 7293S300s2762.7394%
00:32:36autofocusNGC 7293L5s1631.75—
00:32:51autofocusNGC 7293L5s476.16—
00:33:06autofocusNGC 7293L5s574.75—
00:33:21autofocusNGC 7293L5s723.75—
00:33:36autofocusNGC 7293L5s1062.50—
00:33:56autofocusNGC 7293L5s1631.71—
00:34:16autofocusNGC 7293L5s1631.67—
00:34:36autofocusNGC 7293L5s1272.32—
00:34:56autofocusNGC 7293L5s962.89—
00:35:11autofocusNGC 7293L5s574.05—
00:35:26autofocusNGC 7293L5s325.70—
00:35:46autofocusNGC 7293L5s1571.77—
00:41:40lightNGC 7293S300s2542.9386%
00:47:36lightNGC 7293H300s2062.87100%
00:53:10lightNGC 7293H300s1992.9197%
00:58:51lightNGC 7293H300s1973.0096%
01:04:42lightNGC 7293H300s1903.0692%
01:10:45lightNGC 7293O300s1603.1176%
01:16:45lightNGC 7293O300s1633.0377%
01:22:36lightNGC 7293O300s1593.1175%
01:28:06lightNGC 7293O300s1523.2272%
01:33:50lightNGC 7293S300s2123.1672%
01:39:52lightNGC 7293S300s2023.2568%
01:40:46autofocusNGC 7293L5s1282.04—
01:41:06autofocusNGC 7293L5s315.94—
01:41:21autofocusNGC 7293L5s514.56—
01:41:36autofocusNGC 7293L5s583.82—
01:41:51autofocusNGC 7293L5s1032.38—
01:42:11autofocusNGC 7293L5s1381.88—
01:42:31autofocusNGC 7293L5s1331.94—
01:42:51autofocusNGC 7293L5s1082.42—
01:43:11autofocusNGC 7293L5s713.18—
01:43:26autofocusNGC 7293L5s374.62—
01:43:46autofocusNGC 7293L5s1311.92—
01:49:39lightNGC 7293S300s2053.2069%
01:55:12lightNGC 7293S300s2143.1273%
02:01:11lightNGC 7293H300s1573.3176%
02:07:13lightNGC 7293H300s1623.1979%
02:12:58lightNGC 7293H300s1443.4770%
02:18:51lightNGC 7293H300s1583.1977%
02:24:40lightNGC 7293O300s1263.4160%
02:30:13lightNGC 7293O300s1133.6754%
02:36:13lightNGC 7293O300s944.0945%
02:37:41autofocusNGC 7293L5s892.28—
02:37:56autofocusNGC 7293L5s175.85—
02:38:11autofocusNGC 7293L5s224.79—
02:38:26autofocusNGC 7293L5s403.79—
02:38:41autofocusNGC 7293L5s692.75—
02:39:01autofocusNGC 7293L5s882.44—
02:39:21autofocusNGC 7293L5s892.27—
02:39:41autofocusNGC 7293L5s622.88—
02:40:01autofocusNGC 7293L5s503.50—
02:40:16autofocusNGC 7293L5s294.58—
02:40:31autofocusNGC 7293L5s155.95—
02:40:51autofocusNGC 7293L5s732.62—
02:41:16autofocusNGC 7293L5s215.27—
02:41:31autofocusNGC 7293L5s304.41—
02:41:46autofocusNGC 7293L5s573.01—
02:42:01autofocusNGC 7293L5s682.67—
02:42:21autofocusNGC 7293L5s852.21—
02:42:41autofocusNGC 7293L5s772.54—
02:43:01autofocusNGC 7293L5s583.11—
02:43:16autofocusNGC 7293L5s324.21—
02:43:31autofocusNGC 7293L5s195.51—
02:43:51autofocusNGC 7293L5s912.21—
02:48:41autofocusIC 434 Panel 3L5s1992.69—
02:48:56autofocusIC 434 Panel 3L5s1233.51—
02:49:11autofocusIC 434 Panel 3L5s2132.36—
02:49:26autofocusIC 434 Panel 3L5s2602.02—
02:49:41autofocusIC 434 Panel 3L5s2751.97—
02:50:01autofocusIC 434 Panel 3L5s2022.69—
02:50:21autofocusIC 434 Panel 3L5s1153.58—
02:50:41autofocusIC 434 Panel 3L5s794.81—
02:51:01autofocusIC 434 Panel 3L5s615.91—
02:51:21autofocusIC 434 Panel 3L5s924.65—
02:51:41autofocusIC 434 Panel 3L5s2911.79—
02:59:08lightIC 434 Panel 3H300s2053.3298%
03:04:39lightIC 434 Panel 3H300s2093.21100%
03:10:13lightIC 434 Panel 3H300s2093.27100%
03:15:47lightIC 434 Panel 3H300s2113.24101%
03:21:37lightIC 434 Panel 3O300s2073.26105%
03:27:09lightIC 434 Panel 3O300s1933.4098%
03:32:44lightIC 434 Panel 3O300s1943.4398%
03:38:16lightIC 434 Panel 3O300s1973.37100%
03:44:02lightIC 434 Panel 3S300s3483.3375%
03:44:51autofocusIC 434 Panel 3L5s2561.72—
03:45:06autofocusIC 434 Panel 3L5s695.46—
03:45:21autofocusIC 434 Panel 3L5s934.15—
03:45:36autofocusIC 434 Panel 3L5s1283.20—
03:45:51autofocusIC 434 Panel 3L5s1882.23—
03:46:11autofocusIC 434 Panel 3L5s2541.71—
03:46:31autofocusIC 434 Panel 3L5s2341.74—
03:46:51autofocusIC 434 Panel 3L5s1992.40—
03:47:11autofocusIC 434 Panel 3L5s1123.53—
03:47:26autofocusIC 434 Panel 3L5s674.82—
03:47:46autofocusIC 434 Panel 3L5s2431.76—
03:53:40lightIC 434 Panel 3S300s4252.8891%
03:59:12lightIC 434 Panel 3S300s4702.68101%
04:04:44lightIC 434 Panel 3S300s4672.72100%
04:05:31autofocusIC 434 Panel 2L5s2901.67—
04:05:46autofocusIC 434 Panel 2L5s1074.88—
04:06:01autofocusIC 434 Panel 2L5s1313.63—
04:06:16autofocusIC 434 Panel 2L5s1912.53—
04:06:31autofocusIC 434 Panel 2L5s3081.73—
04:06:51autofocusIC 434 Panel 2L5s2831.78—
04:07:11autofocusIC 434 Panel 2L5s2302.31—
04:07:31autofocusIC 434 Panel 2L5s1613.02—
04:07:51autofocusIC 434 Panel 2L5s1114.17—
04:08:11autofocusIC 434 Panel 2L5s805.48—
04:08:31autofocusIC 434 Panel 2L5s855.94—
04:08:51autofocusIC 434 Panel 2L5s2881.79—
04:16:19lightIC 434 Panel 2H300s1902.9195%
04:21:51lightIC 434 Panel 2H300s2012.75101%
04:27:22lightIC 434 Panel 2H300s1982.8299%
04:32:50lightIC 434 Panel 2H300s1992.81100%
04:38:38lightIC 434 Panel 2O300s2382.91102%
04:44:10lightIC 434 Panel 2O300s2332.98100%
04:49:44lightIC 434 Panel 2O300s1643.9270%
04:50:42autofocusIC 434 Panel 2L5s2142.04—
04:50:56autofocusIC 434 Panel 2L5s655.28—
04:51:11autofocusIC 434 Panel 2L5s784.32—
04:51:26autofocusIC 434 Panel 2L5s1033.28—
04:51:41autofocusIC 434 Panel 2L5s1662.45—
04:52:01autofocusIC 434 Panel 2L5s2032.07—
04:52:21autofocusIC 434 Panel 2L5s2112.05—
04:52:41autofocusIC 434 Panel 2L5s1303.12—
04:53:01autofocusIC 434 Panel 2L5s953.96—
04:53:16autofocusIC 434 Panel 2L5s654.97—
04:53:31autofocusIC 434 Panel 2L5s506.11—
04:53:51autofocusIC 434 Panel 2L5s2211.94—
04:59:45lightIC 434 Panel 2O300s2292.9498%
05:05:30lightIC 434 Panel 2S300s4052.6492%
05:11:03lightIC 434 Panel 2S300s4172.5495%
05:16:34lightIC 434 Panel 2S300s4392.48100%
05:22:05lightIC 434 Panel 2S300s4472.41102%
05:22:51autofocusIC 434 Panel 1L5s2331.71—
05:23:06autofocusIC 434 Panel 1L5s895.05—
05:23:21autofocusIC 434 Panel 1L5s1123.89—
05:23:36autofocusIC 434 Panel 1L5s1242.95—
05:23:51autofocusIC 434 Panel 1L5s2081.93—
05:24:11autofocusIC 434 Panel 1L5s2301.72—
05:24:31autofocusIC 434 Panel 1L5s2251.86—
05:24:51autofocusIC 434 Panel 1L5s1422.90—
05:25:06autofocusIC 434 Panel 1L5s984.20—
05:25:21autofocusIC 434 Panel 1L5s825.16—
05:25:41autofocusIC 434 Panel 1L5s2451.61—
05:35:31autofocusIC 434 Panel 1L5s872.26—
05:35:46autofocusIC 434 Panel 1L5s386.92—
05:36:01autofocusIC 434 Panel 1L5s475.46—
05:36:16autofocusIC 434 Panel 1L5s544.58—
05:36:31autofocusIC 434 Panel 1L5s773.05—
05:36:51autofocusIC 434 Panel 1L5s971.82—
05:37:11autofocusIC 434 Panel 1L5s1131.45—
05:37:31autofocusIC 434 Panel 1L5s941.98—
05:37:51autofocusIC 434 Panel 1L5s832.75—
05:38:06autofocusIC 434 Panel 1L5s613.60—
05:38:21autofocusIC 434 Panel 1L5s454.70—
05:38:41autofocusIC 434 Panel 1L5s1041.57—

Star counts come from Hocus Focus detection on each saved sub, tagged with the filter in place at exposure start and the target then being imaged. Frames inside completed autofocus runs are excluded. Still capture times come from the AllSky filenames. All times are local.