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)
17.63
Bortle class
Class 9 (Class 9)
Darkness Quotient
20%
Dataset
July 2026

Inner city sky

Ottawa: The Practical Verdict

Ottawa, the capital city of Canada, sits in a densely populated urban area within Ontario. The city suffers from severe urban sky conditions, with extreme light pollution dominating the night. The Milky Way is not visible, largely limiting deep-sky observations, and the persistent urban light limits the viewing of fainter celestial bodies.

From Ottawa's sky, you can enjoy observing the Moon, planets, and double stars with relative ease, which cut through the city's light dome. However, broadband galaxies, reflection nebulae, and most meteor showers are best avoided here, as they struggle against the overwhelming light pollution. Narrowband imaging is feasible but challenging, while bright targets through electronic observation aid (EAA) can occasionally provide worthwhile views.

For enthusiasts craving a clearer sky, Baie-Obaoca in Quebec is a superb choice, located about 255 km to the north north east. This site offers a remarkable upgrade with its Bortle 2 rating, making it ideal for serious deep-sky observing.

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
Baie-Obaoca, Quebec sits about 253 km north north east and reaches Bortle 2, roughly 44x 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 17.63, 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 17.63), 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 Pontiac, Quebec, about 24 km west north west 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.

  • Pontiac, Quebec
    Direction
    WNW
    Distance (km)
    24.4
    SQM
    20.05
    Bortle
    6
  • Alfred, Ontario
    Direction
    ENE
    Distance (km)
    60.6
    SQM
    19.95
    Bortle
    6
  • North Hero, Vermont
    Direction
    ESE
    Distance (km)
    200.1
    SQM
    20.89
    Bortle
    4
  • Baie-Obaoca, Quebec
    Direction
    NNE
    Distance (km)
    252.5
    SQM
    21.73
    Bortle
    2
  • Réservoir-Dozois, Quebec
    Direction
    NW
    Distance (km)
    262.1
    SQM
    21.46
    Bortle
    3
  • Senneterre (ville), Quebec
    Direction
    S
    Distance (km)
    278.5
    SQM
    21.71
    Bortle
    2