Sky Quality Meter – ALO – Astrofili Lessinia Orientale

Lo Sky Quality Meter è uno strumento utile a misurare la luminosità del cielo. L’unità di misura utilizzata è la magnitudine per arcosecondo quadrato. Maggiore è la magnitudine rilevata, minore sarà l’inquinamento luminoso presente.

La magnitudine è una grandezza usata in astronomia per misurare la luminosità delle stelle (e degli altri oggetti celesti). Punti di riferimento sono:
Sole = –26,8
Luna piena = –12,6
stella Sirio = –1,5
limite delle stelle più deboli visibili ad occhio nudo = +6

L’arcosecondo quadrato è il quadratino di cielo di lato pari ad un arcosecondo di grado, cioè la 3600-ma parte di un grado (la Luna, ad esempio, ha un diametro di mezzo grado, quindi 1800 secondi d’arco).

All’Osservatorio abbiamo un sensore installato sulla cupola che rileva questa lettura ogni 5 minuti e la manda su un server dove viene elaborata e graficizzata. Il grafico sottostante viene aggiornato continuamente durante la notte e viene azzerato al crepuscolo quando iniziano le letture per il giorno successivo. Forti variazioni di lettura sono dovute o a luci accese nelle vicinanze o più verosimilmente a transito di nubi.

Letture medie e massime ultimi 30 giorni

Le letture vengono rese disponibili anche in formato Excel a partire dalle 7:45 ogni mattina, insieme ad altri parametri. Le colonne di questo file vanno lette così:

MPSAS:	Magnitudine/arcsec²
NELM:	Magnitudine stellare teorica visibile ad occhio nudo
Temp:	Temperatura del sensore
EncOffset:	Correzione alla magnitudine dovuta alla perdita di luminosità per la copertura del sensore
SolarAlt:	Altezza del sole in gradi decimali rispetto all’orizzonte
LunarAlt:	Altezza della luna in gradi decimali rispetto all’orizzonte
LunarPhase:	Fase lunare (0=luna nuova, 1: luna piena)

Letture SQM delle ultime 24 ore

DateTime	MPSAS	NELM	Temp	EncOffset	SolarAlt	LunarAlt	LunarPhase
20/01/2025 05:05 PM	7.66	-5.99	14.80	0.10	-0.89	-53.42	0.61
20/01/2025 05:10 PM	8.37	-5.28	14.80	0.10	-1.66	-53.50	0.61
20/01/2025 05:15 PM	8.98	-4.68	14.80	0.10	-2.44	-53.55	0.61
20/01/2025 05:20 PM	9.70	-3.96	14.80	0.10	-3.23	-53.58	0.61
20/01/2025 05:25 PM	10.63	-3.03	14.50	0.10	-4.02	-53.58	0.61
20/01/2025 05:30 PM	11.58	-2.09	14.50	0.10	-4.81	-53.54	0.61
20/01/2025 05:35 PM	12.61	-1.07	14.50	0.10	-5.61	-53.48	0.61
20/01/2025 05:40 PM	13.71	0.00	14.50	0.10	-6.42	-53.39	0.61
20/01/2025 05:45 PM	14.82	1.08	14.50	0.10	-7.23	-53.27	0.61
20/01/2025 05:50 PM	15.87	2.07	14.10	0.10	-8.05	-53.12	0.61
20/01/2025 05:55 PM	16.74	2.87	14.50	0.10	-8.87	-52.94	0.60
20/01/2025 06:00 PM	17.57	3.60	14.50	0.10	-9.69	-52.74	0.60
20/01/2025 06:05 PM	18.35	4.26	14.50	0.10	-10.52	-52.51	0.60
20/01/2025 06:10 PM	19.02	4.79	14.10	0.10	-11.36	-52.25	0.60
20/01/2025 06:15 PM	19.48	5.13	14.10	0.10	-12.19	-51.96	0.60
20/01/2025 06:20 PM	19.80	5.36	14.10	0.10	-13.03	-51.65	0.60
20/01/2025 06:25 PM	19.95	5.46	14.10	0.10	-13.88	-51.32	0.60
20/01/2025 06:30 PM	20.05	5.53	14.10	0.10	-14.72	-50.96	0.60
20/01/2025 06:35 PM	20.23	5.65	14.10	0.10	-15.57	-50.58	0.60
20/01/2025 06:40 PM	20.10	5.56	14.10	0.10	-16.43	-50.17	0.60
20/01/2025 06:45 PM	20.34	5.72	14.10	0.10	-17.28	-49.74	0.60
20/01/2025 06:50 PM	20.63	5.90	14.10	0.10	-18.14	-49.30	0.60
20/01/2025 06:55 PM	20.63	5.90	14.10	0.10	-19.00	-48.83	0.60
20/01/2025 07:00 PM	20.66	5.92	14.10	0.10	-19.87	-48.34	0.60
20/01/2025 07:05 PM	20.47	5.80	14.10	0.10	-20.73	-47.83	0.60
20/01/2025 07:10 PM	20.52	5.83	13.80	0.10	-21.59	-47.31	0.60
20/01/2025 07:15 PM	20.48	5.81	13.80	0.10	-22.46	-46.76	0.60
20/01/2025 07:20 PM	20.20	5.63	13.80	0.10	-23.33	-46.20	0.60
20/01/2025 07:25 PM	20.12	5.57	13.80	0.10	-24.20	-45.63	0.60
20/01/2025 07:30 PM	20.20	5.63	13.80	0.10	-25.07	-45.03	0.60
20/01/2025 07:35 PM	20.22	5.64	13.80	0.10	-25.95	-44.43	0.60
20/01/2025 07:40 PM	20.31	5.70	14.10	0.10	-26.82	-43.81	0.60
20/01/2025 07:45 PM	20.34	5.72	14.10	0.10	-27.69	-43.17	0.60
20/01/2025 07:50 PM	20.34	5.72	14.10	0.10	-28.57	-42.53	0.60
20/01/2025 07:55 PM	20.38	5.74	14.10	0.10	-29.44	-41.87	0.59
20/01/2025 08:00 PM	20.41	5.76	14.10	0.10	-30.31	-41.20	0.59
20/01/2025 08:05 PM	20.51	5.82	14.10	0.10	-31.18	-40.51	0.59
20/01/2025 08:10 PM	20.28	5.68	14.10	0.10	-32.05	-39.82	0.59
20/01/2025 08:15 PM	20.26	5.67	14.10	0.10	-32.93	-39.12	0.59
20/01/2025 08:20 PM	20.16	5.60	14.10	0.10	-33.80	-38.41	0.59
20/01/2025 08:25 PM	20.13	5.58	14.10	0.10	-34.67	-37.69	0.59
20/01/2025 08:30 PM	20.08	5.55	14.10	0.10	-35.53	-36.96	0.59
20/01/2025 08:35 PM	20.04	5.52	14.10	0.10	-36.40	-36.22	0.59
20/01/2025 08:40 PM	20.00	5.49	14.10	0.10	-37.26	-35.47	0.59
20/01/2025 08:45 PM	20.02	5.51	14.10	0.10	-38.12	-34.72	0.59
20/01/2025 08:50 PM	20.05	5.53	14.10	0.10	-38.98	-33.96	0.59
20/01/2025 08:55 PM	20.07	5.54	14.10	0.10	-39.83	-33.20	0.59
20/01/2025 09:00 PM	20.12	5.57	14.10	0.10	-40.68	-32.43	0.59
20/01/2025 09:05 PM	20.13	5.58	14.10	0.10	-41.53	-31.65	0.59
20/01/2025 09:10 PM	20.17	5.61	14.10	0.10	-42.37	-30.86	0.59
20/01/2025 09:15 PM	20.17	5.61	14.10	0.10	-43.21	-30.07	0.59
20/01/2025 09:20 PM	20.16	5.60	14.10	0.10	-44.04	-29.28	0.59
20/01/2025 09:25 PM	20.18	5.61	14.10	0.10	-44.87	-28.48	0.59
20/01/2025 09:30 PM	20.17	5.61	14.10	0.10	-45.69	-27.68	0.59
20/01/2025 09:35 PM	20.11	5.57	14.10	0.10	-46.50	-26.88	0.59
20/01/2025 09:40 PM	20.15	5.59	14.10	0.10	-47.31	-26.07	0.59
20/01/2025 09:45 PM	20.30	5.69	14.10	0.10	-48.11	-25.25	0.59
20/01/2025 09:50 PM	20.40	5.76	14.10	0.10	-48.91	-24.44	0.59
20/01/2025 09:55 PM	20.42	5.77	14.10	0.10	-49.69	-23.62	0.59
20/01/2025 10:00 PM	20.43	5.77	14.10	0.10	-50.46	-22.80	0.59
20/01/2025 10:05 PM	20.43	5.77	14.10	0.10	-51.23	-21.97	0.58
20/01/2025 10:10 PM	20.35	5.72	14.10	0.10	-51.98	-21.15	0.58
20/01/2025 10:15 PM	20.29	5.69	13.80	0.10	-52.72	-20.32	0.58
20/01/2025 10:20 PM	20.28	5.68	13.80	0.10	-53.45	-19.49	0.58
20/01/2025 10:25 PM	20.24	5.65	13.80	0.10	-54.17	-18.66	0.58
20/01/2025 10:30 PM	20.26	5.67	13.80	0.10	-54.87	-17.83	0.58
20/01/2025 10:35 PM	20.21	5.63	14.10	0.10	-55.56	-17.00	0.58
20/01/2025 10:40 PM	20.22	5.64	14.10	0.10	-56.23	-16.16	0.58
20/01/2025 10:45 PM	20.26	5.67	14.10	0.10	-56.88	-15.33	0.58
20/01/2025 10:50 PM	20.25	5.66	14.10	0.10	-57.51	-14.50	0.58
20/01/2025 10:55 PM	20.30	5.69	14.10	0.10	-58.13	-13.66	0.58
20/01/2025 11:00 PM	20.31	5.70	14.10	0.10	-58.72	-12.83	0.58
20/01/2025 11:05 PM	20.27	5.67	14.10	0.10	-59.29	-12.00	0.58
20/01/2025 11:10 PM	20.31	5.70	14.10	0.10	-59.84	-11.16	0.58
20/01/2025 11:15 PM	20.37	5.74	14.10	0.10	-60.36	-10.33	0.58
20/01/2025 11:20 PM	20.42	5.77	14.10	0.10	-60.86	-9.50	0.58
20/01/2025 11:25 PM	20.47	5.80	14.10	0.10	-61.32	-8.67	0.58
20/01/2025 11:30 PM	20.46	5.79	14.10	0.10	-61.76	-7.84	0.58
20/01/2025 11:35 PM	20.38	5.74	13.80	0.10	-62.17	-7.01	0.58
20/01/2025 11:40 PM	20.30	5.69	13.80	0.10	-62.55	-6.19	0.58
20/01/2025 11:45 PM	20.34	5.72	13.80	0.10	-62.89	-5.36	0.58
20/01/2025 11:50 PM	20.36	5.73	13.80	0.10	-63.19	-4.54	0.58
20/01/2025 11:55 PM	20.41	5.76	13.80	0.10	-63.46	-3.72	0.58
21/01/2025 12:00 AM	20.39	5.75	13.80	0.10	-63.70	-2.90	0.58
21/01/2025 12:05 AM	20.31	5.70	13.80	0.10	-63.89	-2.09	0.58
21/01/2025 12:10 AM	20.31	5.70	13.80	0.10	-64.04	-1.28	0.58
21/01/2025 12:15 AM	20.23	5.65	13.80	0.10	-64.16	-0.47	0.58
21/01/2025 12:20 AM	20.22	5.64	13.80	0.10	-64.23	0.34	0.58
21/01/2025 12:25 AM	20.23	5.65	13.80	0.10	-64.26	1.14	0.58
21/01/2025 12:30 AM	20.30	5.69	13.80	0.10	-64.26	1.94	0.57
21/01/2025 12:35 AM	20.30	5.69	13.80	0.10	-64.20	2.73	0.57
21/01/2025 12:40 AM	20.29	5.69	13.80	0.10	-64.11	3.52	0.57
21/01/2025 12:45 AM	20.26	5.67	13.80	0.10	-63.98	4.31	0.57
21/01/2025 12:50 AM	20.19	5.62	13.80	0.10	-63.81	5.09	0.57
21/01/2025 12:55 AM	20.15	5.59	13.80	0.10	-63.60	5.87	0.57
21/01/2025 01:00 AM	20.14	5.59	13.80	0.10	-63.35	6.64	0.57
21/01/2025 01:05 AM	20.11	5.57	13.80	0.10	-63.07	7.40	0.57
21/01/2025 01:10 AM	20.08	5.55	14.10	0.10	-62.74	8.16	0.57
21/01/2025 01:15 AM	20.01	5.50	14.10	0.10	-62.39	8.92	0.57
21/01/2025 01:20 AM	19.91	5.43	14.10	0.10	-62.00	9.66	0.57
21/01/2025 01:25 AM	19.81	5.36	13.80	0.10	-61.58	10.41	0.57
21/01/2025 01:30 AM	19.78	5.34	13.80	0.10	-61.13	11.14	0.57
21/01/2025 01:35 AM	19.72	5.30	13.80	0.10	-60.65	11.87	0.57
21/01/2025 01:40 AM	19.70	5.29	13.80	0.10	-60.14	12.59	0.57
21/01/2025 01:45 AM	19.64	5.25	13.80	0.10	-59.61	13.30	0.57
21/01/2025 01:50 AM	19.75	5.32	13.80	0.10	-59.05	14.01	0.57
21/01/2025 01:55 AM	19.68	5.27	13.80	0.10	-58.47	14.71	0.57
21/01/2025 02:00 AM	19.67	5.27	13.80	0.10	-57.86	15.40	0.57
21/01/2025 02:05 AM	19.58	5.20	13.80	0.10	-57.24	16.08	0.57
21/01/2025 02:10 AM	19.56	5.19	13.80	0.10	-56.60	16.75	0.57
21/01/2025 02:15 AM	19.57	5.20	13.80	0.10	-55.94	17.41	0.57
21/01/2025 02:20 AM	19.53	5.17	13.80	0.10	-55.26	18.06	0.57
21/01/2025 02:25 AM	19.53	5.17	13.80	0.10	-54.57	18.70	0.57
21/01/2025 02:30 AM	19.60	5.22	13.80	0.10	-53.86	19.34	0.57
21/01/2025 02:35 AM	19.63	5.24	13.80	0.10	-53.14	19.96	0.57
21/01/2025 02:40 AM	19.58	5.20	13.80	0.10	-52.40	20.57	0.57
21/01/2025 02:45 AM	19.54	5.17	13.80	0.10	-51.65	21.17	0.57
21/01/2025 02:50 AM	19.50	5.14	13.80	0.10	-50.90	21.76	0.57
21/01/2025 02:55 AM	19.48	5.13	13.80	0.10	-50.13	22.33	0.57
21/01/2025 03:00 AM	19.44	5.10	13.80	0.10	-49.35	22.89	0.57
21/01/2025 03:05 AM	19.37	5.05	13.80	0.10	-48.56	23.44	0.57
21/01/2025 03:10 AM	19.30	5.00	13.80	0.10	-47.76	23.98	0.57
21/01/2025 03:15 AM	19.27	4.98	13.80	0.10	-46.96	24.50	0.57
21/01/2025 03:20 AM	19.28	4.98	13.80	0.10	-46.15	25.01	0.57
21/01/2025 03:25 AM	19.17	4.90	13.80	0.10	-45.33	25.51	0.57
21/01/2025 03:30 AM	19.15	4.89	13.80	0.10	-44.51	25.98	0.57
21/01/2025 03:35 AM	19.21	4.93	13.50	0.10	-43.68	26.45	0.57
21/01/2025 03:40 AM	19.21	4.93	13.80	0.10	-42.84	26.90	0.56
21/01/2025 03:45 AM	19.23	4.95	13.80	0.10	-42.00	27.33	0.56
21/01/2025 03:50 AM	19.22	4.94	13.80	0.10	-41.15	27.75	0.56
21/01/2025 03:55 AM	19.25	4.96	13.80	0.10	-40.30	28.15	0.56
21/01/2025 04:00 AM	19.23	4.95	13.80	0.10	-39.45	28.53	0.56
21/01/2025 04:05 AM	19.16	4.89	13.80	0.10	-38.60	28.90	0.56
21/01/2025 04:10 AM	19.12	4.86	13.80	0.10	-37.74	29.25	0.56
21/01/2025 04:15 AM	19.14	4.88	13.80	0.10	-36.87	29.58	0.56
21/01/2025 04:20 AM	19.13	4.87	13.80	0.10	-36.01	29.89	0.56
21/01/2025 04:25 AM	19.09	4.84	13.80	0.10	-35.14	30.18	0.56
21/01/2025 04:30 AM	19.05	4.81	13.80	0.10	-34.28	30.46	0.56
21/01/2025 04:35 AM	19.02	4.79	13.80	0.10	-33.41	30.71	0.56
21/01/2025 04:40 AM	19.09	4.84	13.50	0.10	-32.54	30.95	0.56
21/01/2025 04:45 AM	19.09	4.84	13.50	0.10	-31.66	31.16	0.56
21/01/2025 04:50 AM	19.18	4.91	13.50	0.10	-30.79	31.36	0.56
21/01/2025 04:55 AM	19.29	4.99	13.50	0.10	-29.92	31.53	0.56
21/01/2025 05:00 AM	19.25	4.96	13.50	0.10	-29.04	31.69	0.56
21/01/2025 05:05 AM	19.02	4.79	13.50	0.10	-28.17	31.82	0.56
21/01/2025 05:10 AM	19.03	4.80	13.50	0.10	-27.29	31.94	0.56
21/01/2025 05:15 AM	19.11	4.86	13.50	0.10	-26.42	32.03	0.56
21/01/2025 05:20 AM	19.26	4.97	13.50	0.10	-25.54	32.10	0.56
21/01/2025 05:25 AM	19.36	5.04	13.50	0.10	-24.67	32.15	0.56
21/01/2025 05:30 AM	19.31	5.01	13.50	0.10	-23.80	32.18	0.56
21/01/2025 05:35 AM	19.12	4.86	13.50	0.10	-22.93	32.19	0.56
21/01/2025 05:40 AM	19.08	4.83	13.50	0.10	-22.06	32.17	0.56
21/01/2025 05:45 AM	19.15	4.89	13.50	0.10	-21.19	32.14	0.56
21/01/2025 05:50 AM	19.04	4.80	13.50	0.10	-20.32	32.08	0.56
21/01/2025 05:55 AM	19.07	4.83	13.50	0.10	-19.46	32.01	0.56
21/01/2025 06:00 AM	19.19	4.92	13.50	0.10	-18.60	31.91	0.56
21/01/2025 06:05 AM	19.28	4.98	13.50	0.10	-17.74	31.79	0.56
21/01/2025 06:10 AM	18.80	4.62	13.50	0.10	-16.88	31.65	0.56
21/01/2025 06:15 AM	18.91	4.70	13.20	0.10	-16.02	31.49	0.56
21/01/2025 06:20 AM	18.87	4.67	13.20	0.10	-15.17	31.31	0.56
21/01/2025 06:25 AM	18.82	4.63	13.20	0.10	-14.32	31.11	0.56
21/01/2025 06:30 AM	19.11	4.86	13.20	0.10	-13.47	30.88	0.56
21/01/2025 06:35 AM	18.65	4.50	13.20	0.10	-12.63	30.64	0.56
21/01/2025 06:40 AM	18.50	4.38	13.20	0.10	-11.79	30.38	0.56
21/01/2025 06:45 AM	18.17	4.11	12.80	0.10	-10.95	30.10	0.56
21/01/2025 06:50 AM	17.71	3.72	12.80	0.10	-10.12	29.80	0.56
21/01/2025 06:55 AM	16.96	3.07	12.80	0.10	-9.29	29.49	0.56
21/01/2025 07:00 AM	15.99	2.18	12.80	0.10	-8.46	29.15	0.56
21/01/2025 07:05 AM	15.11	1.35	12.80	0.10	-7.64	28.80	0.56
21/01/2025 07:10 AM	14.21	0.49	12.80	0.10	-6.83	28.42	0.56
21/01/2025 07:15 AM	13.17	-0.52	13.20	0.10	-6.01	28.03	0.56
DateTime	MPSAS	NELM	Temp	EncOffset	SolarAlt	LunarAlt	LunarPhase