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 |
---|---|---|---|---|---|---|---|
01/10/2023 06:00 PM | 8.02 | -5.63 | 27.30 | 0.10 | -1.47 | -9.17 | 0.93 |
01/10/2023 06:05 PM | 8.81 | -4.85 | 26.70 | 0.10 | -2.35 | -8.45 | 0.93 |
01/10/2023 06:10 PM | 9.72 | -3.94 | 26.40 | 0.10 | -3.22 | -7.71 | 0.93 |
01/10/2023 06:15 PM | 10.65 | -3.01 | 25.40 | 0.10 | -4.09 | -6.97 | 0.93 |
01/10/2023 06:20 PM | 11.72 | -1.95 | 25.40 | 0.10 | -4.97 | -6.22 | 0.93 |
01/10/2023 06:25 PM | 12.92 | -0.77 | 24.80 | 0.10 | -5.85 | -5.47 | 0.93 |
01/10/2023 06:30 PM | 14.10 | 0.38 | 24.40 | 0.10 | -6.72 | -4.71 | 0.93 |
01/10/2023 06:35 PM | 15.22 | 1.46 | 24.10 | 0.10 | -7.59 | -3.95 | 0.93 |
01/10/2023 06:40 PM | 16.23 | 2.40 | 23.80 | 0.10 | -8.47 | -3.17 | 0.92 |
01/10/2023 06:45 PM | 17.15 | 3.23 | 23.80 | 0.10 | -9.34 | -2.40 | 0.92 |
01/10/2023 06:50 PM | 17.98 | 3.95 | 23.50 | 0.10 | -10.21 | -1.61 | 0.92 |
01/10/2023 06:55 PM | 18.71 | 4.55 | 23.20 | 0.10 | -11.08 | -0.83 | 0.92 |
01/10/2023 07:00 PM | 19.29 | 4.99 | 23.20 | 0.10 | -11.95 | -0.03 | 0.92 |
01/10/2023 07:05 PM | 19.67 | 5.27 | 22.80 | 0.10 | -12.82 | 0.76 | 0.92 |
01/10/2023 07:10 PM | 19.87 | 5.41 | 22.80 | 0.10 | -13.68 | 1.57 | 0.92 |
01/10/2023 07:15 PM | 19.90 | 5.43 | 22.50 | 0.10 | -14.54 | 2.37 | 0.92 |
01/10/2023 07:20 PM | 19.87 | 5.41 | 22.50 | 0.10 | -15.40 | 3.18 | 0.92 |
01/10/2023 07:25 PM | 19.82 | 5.37 | 22.50 | 0.10 | -16.26 | 4.00 | 0.92 |
01/10/2023 07:30 PM | 19.77 | 5.34 | 22.50 | 0.10 | -17.11 | 4.82 | 0.92 |
01/10/2023 07:35 PM | 19.68 | 5.27 | 22.20 | 0.10 | -17.97 | 5.64 | 0.92 |
01/10/2023 07:40 PM | 19.62 | 5.23 | 22.20 | 0.10 | -18.81 | 6.47 | 0.92 |
01/10/2023 07:45 PM | 19.56 | 5.19 | 21.90 | 0.10 | -19.65 | 7.30 | 0.92 |
01/10/2023 07:50 PM | 19.50 | 5.14 | 21.90 | 0.10 | -20.49 | 8.13 | 0.92 |
01/10/2023 07:55 PM | 19.44 | 5.10 | 21.90 | 0.10 | -21.33 | 8.97 | 0.92 |
01/10/2023 08:00 PM | 19.40 | 5.07 | 21.90 | 0.10 | -22.16 | 9.81 | 0.92 |
01/10/2023 08:05 PM | 19.35 | 5.04 | 21.50 | 0.10 | -22.98 | 10.65 | 0.92 |
01/10/2023 08:10 PM | 19.32 | 5.01 | 21.50 | 0.10 | -23.80 | 11.49 | 0.92 |
01/10/2023 08:15 PM | 19.28 | 4.98 | 21.50 | 0.10 | -24.61 | 12.34 | 0.92 |
01/10/2023 08:20 PM | 19.24 | 4.95 | 21.50 | 0.10 | -25.42 | 13.19 | 0.92 |
01/10/2023 08:25 PM | 19.21 | 4.93 | 21.50 | 0.10 | -26.22 | 14.04 | 0.92 |
01/10/2023 08:30 PM | 19.17 | 4.90 | 21.50 | 0.10 | -27.02 | 14.89 | 0.92 |
01/10/2023 08:35 PM | 19.14 | 4.88 | 21.50 | 0.10 | -27.80 | 15.74 | 0.92 |
01/10/2023 08:40 PM | 19.04 | 4.80 | 21.20 | 0.10 | -28.58 | 16.60 | 0.92 |
01/10/2023 08:45 PM | 19.00 | 4.77 | 21.20 | 0.10 | -29.36 | 17.46 | 0.92 |
01/10/2023 08:50 PM | 18.97 | 4.75 | 21.20 | 0.10 | -30.12 | 18.32 | 0.92 |
01/10/2023 08:55 PM | 18.94 | 4.73 | 21.20 | 0.10 | -30.88 | 19.18 | 0.92 |
01/10/2023 09:00 PM | 18.91 | 4.70 | 21.20 | 0.10 | -31.62 | 20.04 | 0.92 |
01/10/2023 09:05 PM | 18.88 | 4.68 | 21.20 | 0.10 | -32.36 | 20.90 | 0.92 |
01/10/2023 09:10 PM | 18.86 | 4.66 | 21.20 | 0.10 | -33.08 | 21.76 | 0.92 |
01/10/2023 09:15 PM | 18.82 | 4.63 | 21.20 | 0.10 | -33.80 | 22.62 | 0.92 |
01/10/2023 09:20 PM | 18.81 | 4.63 | 21.20 | 0.10 | -34.50 | 23.49 | 0.92 |
01/10/2023 09:25 PM | 18.78 | 4.60 | 21.20 | 0.10 | -35.20 | 24.35 | 0.92 |
01/10/2023 09:30 PM | 18.76 | 4.59 | 21.20 | 0.10 | -35.88 | 25.21 | 0.92 |
01/10/2023 09:35 PM | 18.73 | 4.56 | 21.20 | 0.10 | -36.55 | 26.07 | 0.92 |
01/10/2023 09:40 PM | 18.71 | 4.55 | 21.20 | 0.10 | -37.20 | 26.93 | 0.92 |
01/10/2023 09:45 PM | 18.68 | 4.52 | 21.20 | 0.10 | -37.85 | 27.80 | 0.92 |
01/10/2023 09:50 PM | 18.67 | 4.52 | 21.20 | 0.10 | -38.47 | 28.66 | 0.92 |
01/10/2023 09:55 PM | 18.64 | 4.49 | 21.20 | 0.10 | -39.09 | 29.51 | 0.92 |
01/10/2023 10:00 PM | 18.62 | 4.48 | 21.20 | 0.10 | -39.68 | 30.37 | 0.92 |
01/10/2023 10:05 PM | 18.59 | 4.45 | 21.20 | 0.10 | -40.26 | 31.23 | 0.92 |
01/10/2023 10:10 PM | 18.57 | 4.44 | 20.90 | 0.10 | -40.83 | 32.08 | 0.92 |
01/10/2023 10:15 PM | 18.54 | 4.41 | 20.90 | 0.10 | -41.37 | 32.93 | 0.92 |
01/10/2023 10:20 PM | 18.51 | 4.39 | 20.90 | 0.10 | -41.90 | 33.78 | 0.92 |
01/10/2023 10:25 PM | 18.49 | 4.37 | 20.90 | 0.10 | -42.41 | 34.63 | 0.92 |
01/10/2023 10:30 PM | 18.47 | 4.36 | 20.90 | 0.10 | -42.90 | 35.47 | 0.92 |
01/10/2023 10:35 PM | 18.43 | 4.32 | 20.90 | 0.10 | -43.38 | 36.31 | 0.91 |
01/10/2023 10:40 PM | 18.40 | 4.30 | 20.90 | 0.10 | -43.83 | 37.15 | 0.91 |
01/10/2023 10:45 PM | 18.37 | 4.27 | 20.90 | 0.10 | -44.25 | 37.98 | 0.91 |
01/10/2023 10:50 PM | 18.35 | 4.26 | 20.90 | 0.10 | -44.66 | 38.81 | 0.91 |
01/10/2023 10:55 PM | 18.31 | 4.22 | 20.90 | 0.10 | -45.04 | 39.63 | 0.91 |
01/10/2023 11:00 PM | 18.26 | 4.18 | 20.90 | 0.10 | -45.40 | 40.45 | 0.91 |
01/10/2023 11:05 PM | 18.24 | 4.17 | 20.90 | 0.10 | -45.74 | 41.27 | 0.91 |
01/10/2023 11:10 PM | 18.21 | 4.14 | 20.60 | 0.10 | -46.05 | 42.08 | 0.91 |
01/10/2023 11:15 PM | 18.17 | 4.11 | 20.60 | 0.10 | -46.34 | 42.88 | 0.91 |
01/10/2023 11:20 PM | 18.13 | 4.08 | 20.60 | 0.10 | -46.60 | 43.67 | 0.91 |
01/10/2023 11:25 PM | 18.09 | 4.04 | 20.60 | 0.10 | -46.84 | 44.46 | 0.91 |
01/10/2023 11:30 PM | 18.05 | 4.01 | 20.60 | 0.10 | -47.05 | 45.24 | 0.91 |
01/10/2023 11:35 PM | 18.01 | 3.98 | 20.60 | 0.10 | -47.23 | 46.01 | 0.91 |
01/10/2023 11:40 PM | 17.98 | 3.95 | 20.60 | 0.10 | -47.38 | 46.78 | 0.91 |
01/10/2023 11:45 PM | 17.94 | 3.92 | 20.60 | 0.10 | -47.51 | 47.53 | 0.91 |
01/10/2023 11:50 PM | 17.89 | 3.88 | 20.60 | 0.10 | -47.61 | 48.28 | 0.91 |
01/10/2023 11:55 PM | 17.86 | 3.85 | 20.30 | 0.10 | -47.68 | 49.01 | 0.91 |
02/10/2023 12:00 AM | 17.81 | 3.81 | 20.30 | 0.10 | -47.73 | 49.74 | 0.91 |
02/10/2023 12:05 AM | 17.76 | 3.77 | 20.30 | 0.10 | -47.74 | 50.45 | 0.91 |
02/10/2023 12:10 AM | 17.69 | 3.71 | 20.30 | 0.10 | -47.73 | 51.15 | 0.91 |
02/10/2023 12:15 AM | 17.64 | 3.66 | 20.30 | 0.10 | -47.69 | 51.83 | 0.91 |
02/10/2023 12:20 AM | 17.59 | 3.62 | 20.30 | 0.10 | -47.62 | 52.50 | 0.91 |
02/10/2023 12:25 AM | 17.51 | 3.55 | 20.30 | 0.10 | -47.52 | 53.16 | 0.91 |
02/10/2023 12:30 AM | 17.46 | 3.51 | 20.30 | 0.10 | -47.39 | 53.80 | 0.91 |
02/10/2023 12:35 AM | 17.41 | 3.46 | 20.30 | 0.10 | -47.24 | 54.42 | 0.91 |
02/10/2023 12:40 AM | 17.37 | 3.43 | 19.90 | 0.10 | -47.06 | 55.03 | 0.91 |
02/10/2023 12:45 AM | 17.29 | 3.36 | 19.90 | 0.10 | -46.85 | 55.61 | 0.91 |
02/10/2023 12:50 AM | 17.23 | 3.31 | 19.90 | 0.10 | -46.62 | 56.18 | 0.91 |
02/10/2023 12:55 AM | 17.15 | 3.23 | 19.90 | 0.10 | -46.36 | 56.72 | 0.91 |
02/10/2023 01:00 AM | 17.08 | 3.17 | 19.90 | 0.10 | -46.07 | 57.24 | 0.91 |
02/10/2023 01:05 AM | 17.07 | 3.16 | 19.90 | 0.10 | -45.76 | 57.74 | 0.91 |
02/10/2023 01:10 AM | 16.96 | 3.07 | 19.90 | 0.10 | -45.43 | 58.22 | 0.91 |
02/10/2023 01:15 AM | 16.90 | 3.01 | 19.90 | 0.10 | -45.07 | 58.66 | 0.91 |
02/10/2023 01:20 AM | 16.83 | 2.95 | 19.90 | 0.10 | -44.68 | 59.09 | 0.91 |
02/10/2023 01:25 AM | 16.74 | 2.87 | 19.90 | 0.10 | -44.28 | 59.48 | 0.91 |
02/10/2023 01:30 AM | 16.63 | 2.77 | 19.90 | 0.10 | -43.85 | 59.84 | 0.91 |
02/10/2023 01:35 AM | 16.51 | 2.66 | 19.90 | 0.10 | -43.40 | 60.18 | 0.91 |
02/10/2023 01:40 AM | 16.49 | 2.64 | 19.90 | 0.10 | -42.93 | 60.48 | 0.91 |
02/10/2023 01:45 AM | 16.43 | 2.59 | 19.90 | 0.10 | -42.44 | 60.75 | 0.91 |
02/10/2023 01:50 AM | 16.28 | 2.45 | 19.90 | 0.10 | -41.94 | 60.98 | 0.91 |
02/10/2023 01:55 AM | 16.31 | 2.48 | 19.90 | 0.10 | -41.41 | 61.18 | 0.91 |
02/10/2023 02:00 AM | 16.10 | 2.28 | 19.60 | 0.10 | -40.86 | 61.35 | 0.91 |
02/10/2023 02:05 AM | 16.01 | 2.20 | 19.60 | 0.10 | -40.30 | 61.48 | 0.91 |
02/10/2023 02:10 AM | 15.92 | 2.12 | 19.60 | 0.10 | -39.72 | 61.58 | 0.91 |
02/10/2023 02:15 AM | 15.94 | 2.13 | 19.60 | 0.10 | -39.12 | 61.64 | 0.91 |
02/10/2023 02:20 AM | 15.95 | 2.14 | 19.60 | 0.10 | -38.51 | 61.66 | 0.91 |
02/10/2023 02:25 AM | 15.93 | 2.12 | 19.60 | 0.10 | -37.89 | 61.64 | 0.91 |
02/10/2023 02:30 AM | 15.97 | 2.16 | 19.60 | 0.10 | -37.25 | 61.59 | 0.91 |
02/10/2023 02:35 AM | 15.93 | 2.12 | 19.60 | 0.10 | -36.59 | 61.50 | 0.91 |
02/10/2023 02:40 AM | 16.00 | 2.19 | 19.60 | 0.10 | -35.93 | 61.38 | 0.91 |
02/10/2023 02:45 AM | 16.02 | 2.21 | 19.60 | 0.10 | -35.25 | 61.22 | 0.91 |
02/10/2023 02:50 AM | 16.09 | 2.27 | 19.60 | 0.10 | -34.55 | 61.03 | 0.91 |
02/10/2023 02:55 AM | 16.13 | 2.31 | 19.60 | 0.10 | -33.85 | 60.80 | 0.91 |
02/10/2023 03:00 AM | 16.22 | 2.39 | 19.60 | 0.10 | -33.14 | 60.53 | 0.91 |
02/10/2023 03:05 AM | 16.34 | 2.50 | 19.60 | 0.10 | -32.41 | 60.24 | 0.91 |
02/10/2023 03:10 AM | 16.46 | 2.61 | 19.60 | 0.10 | -31.67 | 59.91 | 0.91 |
02/10/2023 03:15 AM | 16.51 | 2.66 | 19.60 | 0.10 | -30.93 | 59.56 | 0.91 |
02/10/2023 03:20 AM | 16.62 | 2.76 | 19.60 | 0.10 | -30.18 | 59.17 | 0.91 |
02/10/2023 03:25 AM | 16.70 | 2.83 | 19.60 | 0.10 | -29.41 | 58.76 | 0.91 |
02/10/2023 03:30 AM | 16.78 | 2.90 | 19.60 | 0.10 | -28.64 | 58.32 | 0.91 |
02/10/2023 03:35 AM | 16.92 | 3.03 | 19.60 | 0.10 | -27.86 | 57.85 | 0.90 |
02/10/2023 03:40 AM | 16.98 | 3.08 | 19.60 | 0.10 | -27.08 | 57.36 | 0.90 |
02/10/2023 03:45 AM | 17.06 | 3.15 | 19.60 | 0.10 | -26.29 | 56.85 | 0.90 |
02/10/2023 03:50 AM | 17.15 | 3.23 | 19.60 | 0.10 | -25.49 | 56.32 | 0.90 |
02/10/2023 03:55 AM | 17.22 | 3.30 | 19.60 | 0.10 | -24.68 | 55.76 | 0.90 |
02/10/2023 04:00 AM | 17.26 | 3.33 | 19.60 | 0.10 | -23.87 | 55.18 | 0.90 |
02/10/2023 04:05 AM | 17.35 | 3.41 | 19.30 | 0.10 | -23.05 | 54.59 | 0.90 |
02/10/2023 04:10 AM | 17.38 | 3.44 | 19.30 | 0.10 | -22.23 | 53.97 | 0.90 |
02/10/2023 04:15 AM | 17.46 | 3.51 | 19.30 | 0.10 | -21.40 | 53.34 | 0.90 |
02/10/2023 04:20 AM | 17.50 | 3.54 | 19.30 | 0.10 | -20.57 | 52.70 | 0.90 |
02/10/2023 04:25 AM | 17.56 | 3.59 | 19.30 | 0.10 | -19.73 | 52.04 | 0.90 |
02/10/2023 04:30 AM | 17.61 | 3.64 | 19.30 | 0.10 | -18.89 | 51.36 | 0.90 |
02/10/2023 04:35 AM | 17.66 | 3.68 | 19.30 | 0.10 | -18.04 | 50.68 | 0.90 |
02/10/2023 04:40 AM | 17.70 | 3.71 | 19.30 | 0.10 | -17.19 | 49.98 | 0.90 |
02/10/2023 04:45 AM | 17.76 | 3.77 | 19.30 | 0.10 | -16.34 | 49.27 | 0.90 |
02/10/2023 04:50 AM | 17.81 | 3.81 | 19.00 | 0.10 | -15.48 | 48.54 | 0.90 |
02/10/2023 04:55 AM | 17.83 | 3.82 | 19.00 | 0.10 | -14.63 | 47.81 | 0.90 |
02/10/2023 05:00 AM | 17.84 | 3.83 | 19.00 | 0.10 | -13.77 | 47.07 | 0.90 |
02/10/2023 05:05 AM | 17.87 | 3.86 | 19.00 | 0.10 | -12.90 | 46.32 | 0.90 |
02/10/2023 05:10 AM | 17.83 | 3.82 | 19.00 | 0.10 | -12.04 | 45.56 | 0.90 |
02/10/2023 05:15 AM | 17.70 | 3.71 | 19.00 | 0.10 | -11.17 | 44.79 | 0.90 |
02/10/2023 05:20 AM | 17.39 | 3.45 | 19.30 | 0.10 | -10.30 | 44.02 | 0.90 |
02/10/2023 05:25 AM | 16.89 | 3.00 | 19.00 | 0.10 | -9.43 | 43.24 | 0.90 |
02/10/2023 05:30 AM | 16.19 | 2.37 | 19.00 | 0.10 | -8.56 | 42.45 | 0.90 |
02/10/2023 05:35 AM | 15.30 | 1.53 | 19.00 | 0.10 | -7.69 | 41.66 | 0.90 |
02/10/2023 05:40 AM | 14.21 | 0.49 | 19.00 | 0.10 | -6.82 | 40.86 | 0.90 |
02/10/2023 05:45 AM | 13.03 | -0.66 | 19.00 | 0.10 | -5.95 | 40.06 | 0.90 |
DateTime | MPSAS | NELM | Temp | EncOffset | SolarAlt | LunarAlt | LunarPhase |