Louisville Stargazing & Astronomy Report
Light pollution and stargazing locations near Louisville
- City
- Louisville
- Country
- United States
- Latitude
- 38.2527
- Longitude
- -85.7585
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 17.52
- Bortle class
- Class 9 (Class 9)
- Darkness Quotient
- 19%
- Dataset
- August 2026
Inner city sky
Louisville: The Practical Verdict
Louisville, a major city in the United States, is characterised by dense urban lighting. As a result, the severe urban sky makes for challenging stargazing conditions. With extreme light pollution, the Milky Way remains entirely invisible from this location.
While the sky is quite limited, the Moon, planets, and bright stars remain the most reliable targets from within the city. Double stars and certain solar system events can also be observed, with narrowband imaging viable albeit with some care. However, visual deep-sky observing and broad targeting of galaxies are not recommended due to the luminance.
For those seeking improved conditions, heading to a site 104 km west-north-west presents a noted upgrade. Here, the darkness is significantly greater, reaching a Bortle 4 classification, making it suitable for more serious deep-sky observations.
At a Glance
- Overall
- Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.
- Milky Way
- Not visible - The Milky Way is not visible from this sky.
- Best targets from here
- Moon, planets, bright stars, double stars, solar system events, narrowband imaging only with care
- Do not prioritise
- visual deep-sky observing, broadband galaxies, reflection nebulae, widefield Milky Way
- Best nearby upgrade
- 104 km WNW sits about 104 km west north west and reaches Bortle 4, roughly 21x darker.
- Good dark window
- Louisville's longest dark windows fall in December and January, with the shortest nights around June and July. Plan deep-sky sessions around the autumn and winter months for the best combination of long nights and true astronomical darkness.
Frequently Asked Questions
Can you see the Milky Way from Louisville?
No. Louisville is a Bortle Class 9 sky with SQM 17.52, so the Milky Way is not visible from the city. For Milky Way photography, look for a Bortle 4 or darker site.
What Bortle class is Louisville?
Louisville is Bortle Class 9 (SQM 17.52), a severe urban sky for astronomy.
Is Louisville good for stargazing?
Not for serious deep-sky observing. Louisville is a severe urban sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.
Is Louisville good for astrophotography?
Broadband deep-sky imaging is heavily compromised from Louisville and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Louisville without careful processing.
What can you observe from Louisville?
Primary targets from Louisville include Moon, planets, bright stars, double stars, solar system events. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.
Where are darker skies near Louisville?
The closest meaningfully darker mapped site is 94 km ENE, about 94 km east north east of Louisville, reaching Bortle 5.
When is the sky darkest in Louisville?
The sky over Louisville is darkest around January, December.
Is light pollution in Louisville getting better or worse?
Long-term light pollution over Louisville has been broadly stable across the available measurements.
north - fair
Faint glow on the north horizon. Most stars are visible to low elevation; only the faintest near the ground are affected.
north-north-east - marginal
A diffuse glow sits on the north-north-east horizon. Faint objects below 20 degrees in this direction are compromised.
north-east - fair
A faint diffuse glow on the north-east horizon. Stars are visible to low elevation, with minor losses near the ground.
east-north-east - marginal
The east-north-east lower sky is measurably brighter than the darker quarters. Limit faint work to above about 20 degrees here.
east - marginal
A diffuse glow sits on the east horizon. Faint objects below 20 degrees in this direction are compromised.
east-south-east - marginal
A diffuse glow sits on the east-south-east horizon. Faint objects below 20 degrees in this direction are compromised.
south-east - marginal
Soft skyglow visible on the south-east horizon. Mid-brightness stars survive at low elevation; the faintest do not.
south-south-east - marginal
The south-south-east lower sky is measurably brighter than the darker quarters. Limit faint work to above about 20 degrees here.
south - marginal
Soft skyglow visible on the south horizon. Mid-brightness stars survive at low elevation; the faintest do not.
south-south-west - marginal
Noticeable glow on the south-south-west horizon. Stars below about 20 degrees in this direction are dimmed.
south-west - marginal
A diffuse glow sits on the south-west horizon. Faint objects below 20 degrees in this direction are compromised.
west-south-west - fair
A faint diffuse glow on the west-south-west horizon. Stars are visible to low elevation, with minor losses near the ground.
west - good
No noticeable light pollution to the west. The sky in this direction is dark to the horizon.
west-north-west - fair
Faint glow on the west-north-west horizon. Most stars are visible to low elevation; only the faintest near the ground are affected.
north-west - fair
Light glow detectable on the north-west horizon. The effect fades quickly with elevation and does not affect overhead work.
north-north-west - fair
A faint diffuse glow on the north-north-west horizon. Stars are visible to low elevation, with minor losses near the ground.
zenith - poor
The overhead sky is conspicuously pale. Stars brighter than magnitude 3 are visible; fainter ones are lost.
-
104 km WNW
- Direction
- WNW
- Distance (km)
- 104.1
- SQM
- 20.83
- Bortle
- 4
-
96 km SSE
- Direction
- SSE
- Distance (km)
- 95.5
- SQM
- 20.52
- Bortle
- 5
-
94 km ENE
- Direction
- ENE
- Distance (km)
- 93.8
- SQM
- 20.43
- Bortle
- 5
-
133 km SSW
- Direction
- SSW
- Distance (km)
- 132.5
- SQM
- 20.67
- Bortle
- 5
-
150 km WNW
- Direction
- WNW
- Distance (km)
- 150.4
- SQM
- 20.94
- Bortle
- 4
-
195 km ESE
- Direction
- ESE
- Distance (km)
- 194.7
- SQM
- 20.76
- Bortle
- 5