Upper Alton, IL — light pollution & stargazing
Upper Alton, Illinois has a light-pollution rating of about Bortle 7 — a suburban / urban transition (poor — bright suburban) — measured from VIIRS 2024 satellite night-lights at 30 nW/cm²/sr at the town center. The whole sky glows grayish-white. Only the brighter stars, the Moon, the planets, and a handful of the showiest clusters cut through; deep-sky observing is difficult. The nearest genuinely darker skies are around Wood River, IL (about 5 mi away, Bortle 6). Tonight's Moon phase, cloud cover, and aurora odds load live below, computed in your browser. This is a satellite upward-radiance proxy for planning, not a survey-grade sky-brightness measurement.
Stargazing in Upper Alton tonight
- Estimated Bortle class
- 7 of 9
- VIIRS radiance (town center)
- 30 nW/cm²/sr
- Naked-eye limiting mag.
- 4.6–5.0
- Milky Way
- not visible
Suburban / urban transition. A satellite upward-radiance proxy for planning — not a survey-grade sky-brightness reading.
What you can see from Upper Alton
The whole sky glows grayish-white. Only the brighter stars, the Moon, the planets, and a handful of the showiest clusters cut through; deep-sky observing is difficult.
Darker skies within reach
The nearest town in each darker class — your ladder from Upper Alton's sky toward truly dark skies.
| Town | State | Bortle | Sky | Drive |
|---|---|---|---|---|
| Wood River | IL | 6 | Bright suburban sky | 5 mi |
| Wildwood | MO | 5 | Suburban sky | 36 mi |
| Fitchburg | WI | 4 | Rural / suburban transition | 280 mi |
Frequently asked questions
- Can you see the Milky Way from Upper Alton, IL?
- Not really. At about Bortle 7 the Milky Way is not visible from Upper Alton — the sky is too light-polluted. The nearest genuinely dark skies are around Wood River, IL, about 5 mi away.
- How dark is the sky in Upper Alton?
- Upper Alton rates a suburban / urban transition — about Bortle 7, with a naked-eye limiting magnitude around 4.6–5.0. That comes from a VIIRS satellite night-lights reading of 30 nW/cm²/sr at the town center. It is a satellite proxy for planning, not a survey-grade measurement.
- Where is the nearest dark sky to Upper Alton?
- The nearest town with genuinely darker skies is Wood River, IL — about 5 mi away at roughly Bortle 6. See the "darker skies within reach" list on this page for more options.
- Can I see the aurora from Upper Alton tonight?
- It depends on tonight's space weather. The live panel on this page reads the current NOAA aurora forecast for your latitude, along with cloud cover and the Moon — most U.S. locations only see aurora during strong geomagnetic storms.
The darkness rating is measured from VIIRS satellite night-lights at the town center and is a proxy for planning, not a survey-grade sky-brightness measurement — and the darkest skies are usually a short drive out of any town. Tonight's Moon, cloud, and aurora figures are live third-party forecasts that can change. See the methodology for sources and limits.
More in Illinois
See every town's darkness rating in Illinois, learn to read the Bortle scale, or check tonight's Moon phase.