Ottawa Stargazing & Astronomy Report
Light pollution and stargazing locations near Ottawa
- City
- Ottawa
- Country
- Canada
- Latitude
- 45.4215
- Longitude
- -75.6972
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 17.48
- Bortle class
- Class 9 (Class 9)
- Darkness Quotient
- 19%
- Dataset
- May 2026
Inner city sky
Ottawa: The Practical Verdict
Ottawa, the capital city of Canada located in Ontario, is a major urban centre characterised by severe urban sky conditions. The night sky here is dominated by extreme light pollution, significantly limiting astronomical observation. The main restricting factor is the pervasive light dome engulfing the east-north-east horizon.
From Ottawa, the Milky Way is not visible at all due to the intense light pollution, and visual deep-sky observing is impractical. Celestial viewing should focus on the clearest targets, such as the Moon and planets, bright stars, and solar system events. Narrowband imaging requires careful technique but can yield results on brighter nebulae.
For those seeking darker skies, the best nearby upgrade is La Tuque, Quebec, situated about 290 km to the north-east, offering much darker conditions with a Bortle class 2 sky. This location makes for a worthwhile trip for serious astronomy sessions.
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
- La Tuque, Quebec sits about 288 km north east and reaches Bortle 2, roughly 49x darker.
- Moderate dark window
- Ottawa'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 Ottawa?
No. Ottawa is a Bortle Class 9 sky with SQM 17.48, 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 Ottawa?
Ottawa is Bortle Class 9 (SQM 17.48), a severe urban sky for astronomy.
Is Ottawa good for stargazing?
Not for serious deep-sky observing. Ottawa is a severe urban sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.
Is Ottawa good for astrophotography?
Broadband deep-sky imaging is heavily compromised from Ottawa and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Ottawa without careful processing.
What can you observe from Ottawa?
Primary targets from Ottawa 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 Ottawa?
The closest meaningfully darker mapped site is Champlain, Ontario, about 75 km east of Ottawa, reaching Bortle 6.
When is the sky darkest in Ottawa?
The sky over Ottawa is darkest around January, December.
Is light pollution in Ottawa getting better or worse?
Long-term light pollution over Ottawa has been broadly stable across the available measurements.
north - good
Dark sky in the north direction with no obvious skyglow. Suitable for faint-object work at low elevation.
north-north-east - good
The north-north-east sky is dark to the horizon. Faint targets are accessible at all elevations here.
north-east - fair
Light glow detectable on the north-east horizon. The effect fades quickly with elevation and does not affect overhead work.
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 - fair
Light glow detectable on the east horizon. The effect fades quickly with elevation and does not affect overhead work.
east-south-east - good
Dark sky in the east-south-east direction with no obvious skyglow. Suitable for faint-object work at low elevation.
south-east - fair
The south-east sky is broadly dark with a small amount of glow at the horizon. Most objects in this direction are accessible.
south-south-east - fair
Faint glow on the south-south-east horizon. Most stars are visible to low elevation; only the faintest near the ground are affected.
south - fair
A faint diffuse glow on the south horizon. Stars are visible to low elevation, with minor losses near the ground.
south-south-west - fair
A trace of skyglow near the south-south-west horizon. Stars are clear throughout this direction except very close to the ground.
south-west - marginal
The south-west sky shows a clear glow near the ground. Above about 20 degrees the sky returns to workable.
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
The west horizon is dark. Faint stars are visible close to the ground.
west-north-west - good
Dark sky in the west-north-west direction with no obvious skyglow. Suitable for faint-object work at low elevation.
north-west - good
The north-west horizon is dark. Faint stars are visible close to the ground.
north-north-west - good
Dark sky in the north-north-west direction with no obvious skyglow. Suitable for faint-object work at low elevation.
zenith - poor
The zenith sky background is high. Most faint stars are absent and the Milky Way cannot be seen.
-
Tay Valley, Ontario
- Direction
- SW
- Distance (km)
- 91
- SQM
- 20.81
- Bortle
- 4
-
Champlain, Ontario
- Direction
- E
- Distance (km)
- 75
- SQM
- 19.89
- Bortle
- 6
-
Prince Edward County, Ontario
- Direction
- SW
- Distance (km)
- 221.2
- SQM
- 20.77
- Bortle
- 5
-
Town of Crown Point, New York
- Direction
- SE
- Distance (km)
- 238
- SQM
- 20.84
- Bortle
- 4
-
La Tuque, Quebec
- Direction
- NE
- Distance (km)
- 287.9
- SQM
- 21.70
- Bortle
- 2
-
Les Lacs-du-Témiscamingue, Quebec
- Direction
- WNW
- Distance (km)
- 284
- SQM
- 21.55
- Bortle
- 3