Sky transparency — night of 1–2 August 2026

No 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 3.43″ at 01:03. The 18:04 autofocus run fitted its curve on almost no stars and should not be trusted. The 19:21 autofocus run fitted its curve on almost no stars and should not be trusted.

Transparency index

100 · IQR 71–116

Light frames

Autofocus runs

Failures

6 · solve + PHD2

Guide RMS

0.83″ · RA 0.62 · Dec 0.55

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

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.

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. 7724 guide frames over 12.2 h of guiding in 17 sessions; the gaps are slews, dither settles and autofocus runs, when PHD2 was not guiding. PHD2 discarded 328 further frames — usually a lost star. The worst minute (3.43″ at 01:03) is clamped at the top of the plot.

RA RMS Dec RMS ◆ PHD2 error

Clear‑sky reference medians

The divisors behind the index — median detected stars per light sub.

Target	Filter	Median stars	Frames	Source
RCW 108 Panel 2	H	347	22	tonight, clear frames
RCW 108 Panel 2	O	391	21	tonight, clear frames
RCW 108 Panel 2	S	868	19	tonight, clear frames

Event timeline

All observatory events with their attributed causes.

18:24:15solve failedASTAP plate solve failedunexplained

18:24:39solve failedASTAP plate solve failedunexplained

18:32:04PHD2Image capture stoppedunexplained

19:15:48AF failedautofocus run started 19:14:42 did not completeunexplained

19:23:40AF rejectednew focus point HFR 3.971035037249981 significantly worse than originalunexplained

00:00:25PHD2timed-out waiting for guider to settleunexplained

00:42:23AF rejectednew focus point HFR 4.760850779898805 significantly worse than originalunexplained

00:44:05AF rejectednew focus point HFR 6.395819653059506 significantly worse than originalunexplained

00:44:05AF failedautofocus run started 00:40:27 did not completeunexplained

01:02:28AF failedautofocus run started 01:00:48 did not completeunexplained

01:04:07PHD2timed-out waiting for guider to settleunexplained

02:03:24AF failedautofocus run started 01:09:47 did not completeunexplained

07:19:57PHD2Guiding stoppedunexplained

07:21:34AF failedautofocus run started 07:20:13 did not completeunexplained

All 235 frames

Time	Class	Target	Filter	Exp	Stars	HFR	Index
18:04:38	autofocus	RCW 108 Panel 2	H	4s	3	9.68	—
18:04:48	autofocus	RCW 108 Panel 2	H	4s	14	5.31	—
18:04:56	autofocus	RCW 108 Panel 2	H	4s	14	5.43	—
18:05:04	autofocus	RCW 108 Panel 2	H	4s	13	5.53	—
18:05:16	autofocus	RCW 108 Panel 2	H	4s	5	8.23	—
18:05:28	autofocus	RCW 108 Panel 2	H	4s	3	10.00	—
18:05:44	autofocus	RCW 108 Panel 2	H	4s	27	3.30	—
18:05:58	autofocus	RCW 108 Panel 2	H	4s	24	3.05	—
18:06:12	autofocus	RCW 108 Panel 2	H	4s	23	3.76	—
18:06:28	autofocus	RCW 108 Panel 2	H	4s	9	5.77	—
18:06:40	autofocus	RCW 108 Panel 2	H	4s	5	8.04	—
18:06:54	autofocus	RCW 108 Panel 2	H	4s	16	4.50	—
18:18:18	light	RCW 108 Panel 2	H	300s	1	0.00	0%
18:24:14	light	RCW 108 Panel 2	H	300s	2	5.33	1%
18:29:45	autofocus	RCW 108 Panel 2	H	4s	60	5.67	—
18:29:58	autofocus	RCW 108 Panel 2	H	4s	29	9.51	—
18:30:06	autofocus	RCW 108 Panel 2	H	4s	35	9.04	—
18:30:14	autofocus	RCW 108 Panel 2	H	4s	34	8.13	—
18:30:26	autofocus	RCW 108 Panel 2	H	4s	60	6.20	—
18:30:38	autofocus	RCW 108 Panel 2	H	4s	87	4.50	—
18:30:50	autofocus	RCW 108 Panel 2	H	4s	131	3.39	—
18:31:03	autofocus	RCW 108 Panel 2	H	4s	160	3.00	—
18:31:15	autofocus	RCW 108 Panel 2	H	4s	139	3.53	—
18:31:27	autofocus	RCW 108 Panel 2	H	4s	95	4.71	—
18:31:37	autofocus	RCW 108 Panel 2	H	4s	55	6.74	—
18:31:53	autofocus	RCW 108 Panel 2	H	4s	104	4.30	—
18:48:12	autofocus	RCW 108 Panel 2	O	4s	400	6.39	—
18:48:18	autofocus	RCW 108 Panel 2	O	4s	90	5.95	—
18:48:33	autofocus	RCW 108 Panel 2	O	4s	181	3.02	—
18:48:43	autofocus	RCW 108 Panel 2	O	4s	191	3.07	—
18:48:52	autofocus	RCW 108 Panel 2	O	4s	201	2.90	—
18:49:07	autofocus	RCW 108 Panel 2	O	4s	211	2.88	—
18:49:21	autofocus	RCW 108 Panel 2	O	4s	116	4.03	—
18:49:34	autofocus	RCW 108 Panel 2	O	4s	78	6.57	—
18:49:48	autofocus	RCW 108 Panel 2	O	4s	51	8.12	—
18:50:02	autofocus	RCW 108 Panel 2	O	4s	29	11.10	—
18:50:20	autofocus	RCW 108 Panel 2	O	4s	83	4.79	—
18:50:37	autofocus	RCW 108 Panel 2	O	4s	181	3.15	—
19:03:45	light	RCW 108 Panel 2	O	300s	710	3.57	182%
19:08:58	light	RCW 108 Panel 2	O	300s	750	3.43	192%
19:14:14	light	RCW 108 Panel 2	O	300s	774	3.32	198%
19:14:52	other	RCW 108 Panel 2	S	5s	226	2.88	—
19:15:06	other	RCW 108 Panel 2	S	5s	139	4.68	—
19:15:16	other	RCW 108 Panel 2	S	5s	140	4.46	—
19:15:26	other	RCW 108 Panel 2	S	5s	165	3.93	—
19:15:38	other	RCW 108 Panel 2	S	5s	213	2.96	—
19:21:34	light	RCW 108 Panel 2	S	300s	1654	3.20	191%
19:21:53	autofocus	RCW 108 Panel 2	S	5s	191	3.29	—
19:22:06	autofocus	RCW 108 Panel 2	S	5s	121	4.80	—
19:22:16	autofocus	RCW 108 Panel 2	S	5s	126	4.80	—
19:22:26	autofocus	RCW 108 Panel 2	S	5s	138	4.39	—
19:22:38	autofocus	RCW 108 Panel 2	S	5s	192	3.13	—
19:22:50	autofocus	RCW 108 Panel 2	S	5s	247	2.86	—
19:23:02	autofocus	RCW 108 Panel 2	S	5s	208	3.50	—
19:23:14	autofocus	RCW 108 Panel 2	S	5s	95	6.29	—
19:23:24	autofocus	RCW 108 Panel 2	S	5s	72	7.17	—
19:23:40	autofocus	RCW 108 Panel 2	S	5s	166	3.97	—
19:24:00	autofocus	RCW 108 Panel 2	S	5s	138	4.15	—
19:24:10	autofocus	RCW 108 Panel 2	S	5s	140	3.96	—
19:24:20	autofocus	RCW 108 Panel 2	S	5s	181	3.45	—
19:24:32	autofocus	RCW 108 Panel 2	S	5s	231	2.87	—
19:24:44	autofocus	RCW 108 Panel 2	S	5s	183	3.58	—
19:24:56	autofocus	RCW 108 Panel 2	S	5s	151	4.24	—
19:25:06	autofocus	RCW 108 Panel 2	S	5s	75	6.18	—
19:25:22	autofocus	RCW 108 Panel 2	S	5s	189	3.61	—
19:31:00	light	RCW 108 Panel 2	S	300s	1466	3.64	169%
19:36:15	light	RCW 108 Panel 2	S	300s	1352	3.76	156%
19:41:45	light	RCW 108 Panel 2	S	300s	1350	3.82	156%
19:46:53	light	RCW 108 Panel 2	H	300s	604	3.42	174%
19:52:09	light	RCW 108 Panel 2	H	300s	551	3.60	159%
19:57:23	light	RCW 108 Panel 2	H	300s	566	3.50	163%
19:57:39	autofocus	RCW 108 Panel 2	H	4s	157	3.25	—
19:57:53	autofocus	RCW 108 Panel 2	H	4s	74	5.04	—
19:58:03	autofocus	RCW 108 Panel 2	H	4s	87	4.81	—
19:58:13	autofocus	RCW 108 Panel 2	H	4s	118	3.95	—
19:58:25	autofocus	RCW 108 Panel 2	H	4s	140	3.27	—
19:58:37	autofocus	RCW 108 Panel 2	H	4s	180	3.00	—
19:58:49	autofocus	RCW 108 Panel 2	H	4s	123	3.94	—
19:59:01	autofocus	RCW 108 Panel 2	H	4s	80	5.53	—
19:59:11	autofocus	RCW 108 Panel 2	H	4s	36	8.18	—
19:59:27	autofocus	RCW 108 Panel 2	H	4s	106	3.68	—
20:05:21	light	RCW 108 Panel 2	H	300s	382	5.12	110%
20:11:07	light	RCW 108 Panel 2	O	300s	439	6.20	112%
20:16:08	light	RCW 108 Panel 2	O	300s	415	6.45	106%
20:21:21	light	RCW 108 Panel 2	O	300s	457	6.05	117%
20:26:35	light	RCW 108 Panel 2	O	300s	442	6.08	113%
20:35:02	light	RCW 108 Panel 2	S	300s	678	5.77	78%
20:35:23	autofocus	RCW 108 Panel 2	S	5s	92	5.93	—
20:35:38	autofocus	RCW 108 Panel 2	S	5s	165	3.31	—
20:35:49	autofocus	RCW 108 Panel 2	S	5s	164	3.31	—
20:35:58	autofocus	RCW 108 Panel 2	S	5s	185	3.16	—
20:36:10	autofocus	RCW 108 Panel 2	S	5s	213	3.31	—
20:36:22	autofocus	RCW 108 Panel 2	S	5s	137	4.57	—
20:36:34	autofocus	RCW 108 Panel 2	S	5s	95	6.18	—
20:36:50	autofocus	RCW 108 Panel 2	S	5s	127	4.23	—
20:37:04	autofocus	RCW 108 Panel 2	S	5s	156	3.40	—
20:42:43	light	RCW 108 Panel 2	S	300s	1049	3.62	121%
20:48:03	light	RCW 108 Panel 2	S	300s	1075	3.61	124%
20:53:16	light	RCW 108 Panel 2	S	300s	1004	3.71	116%
20:58:25	light	RCW 108 Panel 2	H	300s	402	4.23	116%
21:03:48	light	RCW 108 Panel 2	H	300s	400	4.18	115%
21:09:08	light	RCW 108 Panel 2	H	300s	401	4.21	116%
21:09:45	autofocus	RCW 108 Panel 2	H	4s	111	3.99	—
21:09:58	autofocus	RCW 108 Panel 2	H	4s	65	6.07	—
21:10:07	autofocus	RCW 108 Panel 2	H	4s	65	6.60	—
21:10:18	autofocus	RCW 108 Panel 2	H	4s	74	5.85	—
21:10:29	autofocus	RCW 108 Panel 2	H	4s	105	4.06	—
21:10:41	autofocus	RCW 108 Panel 2	H	4s	138	3.19	—
21:10:53	autofocus	RCW 108 Panel 2	H	4s	158	3.09	—
21:11:05	autofocus	RCW 108 Panel 2	H	4s	133	3.73	—
21:11:17	autofocus	RCW 108 Panel 2	H	4s	93	5.15	—
21:11:27	autofocus	RCW 108 Panel 2	H	4s	43	7.88	—
21:11:43	autofocus	RCW 108 Panel 2	H	4s	113	4.09	—
21:17:21	light	RCW 108 Panel 2	H	300s	397	4.89	114%
21:23:04	light	RCW 108 Panel 2	O	300s	391	6.39	100%
21:28:05	light	RCW 108 Panel 2	O	300s	384	6.35	98%
21:33:22	light	RCW 108 Panel 2	O	300s	347	6.62	89%
21:38:54	light	RCW 108 Panel 2	O	300s	313	6.94	80%
21:44:19	light	RCW 108 Panel 2	S	300s	533	6.14	61%
21:44:59	autofocus	RCW 108 Panel 2	S	5s	79	5.89	—
21:45:12	autofocus	RCW 108 Panel 2	S	5s	130	3.76	—
21:45:22	autofocus	RCW 108 Panel 2	S	5s	133	3.66	—
21:45:32	autofocus	RCW 108 Panel 2	S	5s	154	3.27	—
21:45:44	autofocus	RCW 108 Panel 2	S	5s	133	3.74	—
21:45:56	autofocus	RCW 108 Panel 2	S	5s	108	4.70	—
21:46:08	autofocus	RCW 108 Panel 2	S	5s	69	6.22	—
21:46:20	autofocus	RCW 108 Panel 2	S	5s	32	9.18	—
21:46:36	autofocus	RCW 108 Panel 2	S	5s	92	4.94	—
21:46:50	autofocus	RCW 108 Panel 2	S	5s	100	4.26	—
21:52:29	light	RCW 108 Panel 2	S	300s	868	3.90	100%
21:57:44	light	RCW 108 Panel 2	S	300s	896	3.85	103%
22:03:06	light	RCW 108 Panel 2	S	300s	890	3.86	103%
22:08:15	light	RCW 108 Panel 2	H	300s	320	4.62	92%
22:13:42	light	RCW 108 Panel 2	H	300s	347	4.51	100%
22:18:57	light	RCW 108 Panel 2	H	300s	328	4.58	95%
22:19:22	autofocus	RCW 108 Panel 2	H	4s	98	4.10	—
22:19:35	autofocus	RCW 108 Panel 2	H	4s	54	7.06	—
22:19:45	autofocus	RCW 108 Panel 2	H	4s	44	7.18	—
22:19:55	autofocus	RCW 108 Panel 2	H	4s	60	5.80	—
22:20:08	autofocus	RCW 108 Panel 2	H	4s	100	4.19	—
22:20:19	autofocus	RCW 108 Panel 2	H	4s	121	3.37	—
22:20:31	autofocus	RCW 108 Panel 2	H	4s	122	3.35	—
22:20:43	autofocus	RCW 108 Panel 2	H	4s	112	3.99	—
22:20:55	autofocus	RCW 108 Panel 2	H	4s	79	5.26	—
22:21:05	autofocus	RCW 108 Panel 2	H	4s	50	7.32	—
22:21:21	autofocus	RCW 108 Panel 2	H	4s	105	4.12	—
22:27:00	light	RCW 108 Panel 2	H	300s	411	4.48	118%
22:33:02	light	RCW 108 Panel 2	O	300s	426	5.69	109%
22:38:34	light	RCW 108 Panel 2	O	300s	395	5.85	101%
22:44:02	light	RCW 108 Panel 2	O	300s	381	5.92	97%
22:49:23	light	RCW 108 Panel 2	O	300s	410	5.76	105%
22:54:39	autofocus	RCW 108 Panel 2	S	300s	648	5.28	—
22:54:48	autofocus	RCW 108 Panel 2	S	5s	105	4.69	—
22:55:03	autofocus	RCW 108 Panel 2	S	5s	117	3.99	—
22:55:12	autofocus	RCW 108 Panel 2	S	5s	120	4.00	—
22:55:23	autofocus	RCW 108 Panel 2	S	5s	132	3.62	—
22:55:34	autofocus	RCW 108 Panel 2	S	5s	147	3.44	—
22:55:46	autofocus	RCW 108 Panel 2	S	5s	138	4.00	—
22:55:58	autofocus	RCW 108 Panel 2	S	5s	93	5.64	—
22:56:11	autofocus	RCW 108 Panel 2	S	5s	71	6.90	—
22:56:26	autofocus	RCW 108 Panel 2	S	5s	116	4.80	—
23:02:04	light	RCW 108 Panel 2	S	300s	653	5.46	75%
23:07:53	light	RCW 108 Panel 2	S	300s	635	5.48	73%
23:12:54	light	RCW 108 Panel 2	S	300s	636	5.46	73%
23:18:02	light	RCW 108 Panel 2	H	300s	352	4.77	101%
23:23:15	light	RCW 108 Panel 2	H	300s	337	4.79	97%
23:28:49	light	RCW 108 Panel 2	H	300s	315	4.95	91%
23:29:53	autofocus	RCW 108 Panel 2	H	4s	73	4.42	—
23:30:05	autofocus	RCW 108 Panel 2	H	4s	93	4.08	—
23:30:15	autofocus	RCW 108 Panel 2	H	4s	77	4.25	—
23:30:25	autofocus	RCW 108 Panel 2	H	4s	87	3.93	—
23:30:37	autofocus	RCW 108 Panel 2	H	4s	109	3.31	—
23:30:49	autofocus	RCW 108 Panel 2	H	4s	92	3.81	—
23:31:01	autofocus	RCW 108 Panel 2	H	4s	42	5.59	—
23:31:11	autofocus	RCW 108 Panel 2	H	4s	28	7.31	—
23:31:27	autofocus	RCW 108 Panel 2	H	4s	97	3.92	—
23:37:05	light	RCW 108 Panel 2	H	300s	305	4.81	88%
23:43:06	light	RCW 108 Panel 2	O	300s	263	6.10	67%
23:48:38	light	RCW 108 Panel 2	O	300s	232	6.00	59%
23:54:07	light	RCW 108 Panel 2	O	300s	226	5.98	58%
23:59:21	light	RCW 108 Panel 2	O	300s	223	6.01	57%
00:05:29	light	RCW 108 Panel 2	S	300s	426	5.37	49%
00:05:48	autofocus	RCW 108 Panel 2	S	5s	59	4.73	—
00:06:03	autofocus	RCW 108 Panel 2	S	5s	47	4.99	—
00:06:12	autofocus	RCW 108 Panel 2	S	5s	67	4.30	—
00:06:22	autofocus	RCW 108 Panel 2	S	5s	88	3.77	—
00:06:34	autofocus	RCW 108 Panel 2	S	5s	85	3.77	—
00:06:47	autofocus	RCW 108 Panel 2	S	5s	63	4.39	—
00:06:58	autofocus	RCW 108 Panel 2	S	5s	42	5.86	—
00:07:11	autofocus	RCW 108 Panel 2	S	5s	27	7.70	—
00:07:26	autofocus	RCW 108 Panel 2	S	5s	58	4.60	—
00:13:02	light	RCW 108 Panel 2	S	300s	432	5.06	50%
00:18:20	light	RCW 108 Panel 2	S	300s	364	5.45	42%
00:23:54	light	RCW 108 Panel 2	S	300s	381	5.21	44%
00:29:03	light	RCW 108 Panel 2	H	300s	255	4.73	73%
00:34:21	light	RCW 108 Panel 2	H	300s	234	4.76	67%
00:39:36	light	RCW 108 Panel 2	H	300s	250	4.49	72%
00:40:35	other	RCW 108 Panel 2	H	4s	37	3.64	—
00:40:49	other	RCW 108 Panel 2	H	4s	15	7.35	—
00:40:59	other	RCW 108 Panel 2	H	4s	20	6.22	—
00:41:09	other	RCW 108 Panel 2	H	4s	15	6.28	—
00:41:21	other	RCW 108 Panel 2	H	4s	22	5.28	—
00:41:33	other	RCW 108 Panel 2	H	4s	34	3.90	—
00:41:45	other	RCW 108 Panel 2	H	4s	34	4.07	—
00:41:57	other	RCW 108 Panel 2	H	4s	20	5.25	—
00:42:07	other	RCW 108 Panel 2	H	4s	16	6.65	—
00:42:23	other	RCW 108 Panel 2	H	4s	26	4.76	—
00:42:41	other	RCW 108 Panel 2	H	4s	26	5.16	—
00:42:52	other	RCW 108 Panel 2	H	4s	23	5.04	—
00:43:01	other	RCW 108 Panel 2	H	4s	31	4.41	—
00:43:13	other	RCW 108 Panel 2	H	4s	32	4.06	—
00:43:25	other	RCW 108 Panel 2	H	4s	26	4.36	—
00:43:37	other	RCW 108 Panel 2	H	4s	22	5.27	—
00:43:49	other	RCW 108 Panel 2	H	4s	15	7.78	—
00:44:05	other	RCW 108 Panel 2	H	4s	14	6.40	—
00:49:53	light	RCW 108 Panel 2	H	300s	237	4.47	68%
00:55:49	light	RCW 108 Panel 2	O	300s	142	4.96	36%
01:00:50	other	RCW 108 Panel 2	O	4s	130	4.80	—
01:00:56	other	RCW 108 Panel 2	O	4s	12	4.33	—
01:01:09	other	RCW 108 Panel 2	O	4s	7	6.06	—
01:01:19	other	RCW 108 Panel 2	O	4s	5	6.28	—
01:01:29	other	RCW 108 Panel 2	O	4s	3	7.10	—
01:01:41	other	RCW 108 Panel 2	O	4s	16	4.09	—
01:01:54	other	RCW 108 Panel 2	O	4s	15	3.99	—
01:02:05	other	RCW 108 Panel 2	O	4s	10	4.86	—
01:02:17	other	RCW 108 Panel 2	O	4s	8	5.25	—
01:02:27	other	RCW 108 Panel 2	O	4s	5	6.55	—
01:08:40	light	RCW 108 Panel 2	O	300s	101	4.84	26%
07:20:21	other	RCW 108 Panel 1	H	4s	0	0.00	—
07:20:34	other	RCW 108 Panel 1	H	4s	0	0.00	—
07:20:44	other	RCW 108 Panel 1	H	4s	0	0.00	—
07:20:54	other	RCW 108 Panel 1	H	4s	0	0.00	—
07:21:09	other	RCW 108 Panel 1	H	4s	0	0.00	—
07:21:21	other	RCW 108 Panel 1	H	4s	0	0.00	—
07:21:34	other	RCW 108 Panel 1	H	4s	0	0.00	—

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.