Rio de Janeiro Stargazing & Astronomy Report

Light pollution and stargazing locations near Rio de Janeiro

City
Rio de Janeiro
Country
Brazil
Latitude
-22.9068
Longitude
-43.1729

Key Sky Quality Metrics

SQM (mag/arcsecĀ²)
17.59
Bortle class
Class 9 (Class 9)
Darkness Quotient
20%
Dataset
April 2026

Inner city sky

Rio de Janeiro: The Practical Verdict

Rio de Janeiro, a significant global metropolis in Brazil, presents a severely light-polluted urban sky. With an Extreme Light Pollution tier and Bortle 9 classification, conditions are poor for stargazing within the city itself, and the Milky Way remains entirely invisible.

Observing from Rio must concentrate on bright celestial objects like the Moon, brighter planets, and prominent stars. Narrowband imaging might also be worth exploring, but visual deep-sky astronomy is largely thwarted. Towards the south-south-east, marginally clearer horizons offer slight improvement amidst the pervasive urban glow.

For those seeking meaningful observing opportunities, a drive to AbraĆ£o, around 110 km to the west-south-west, offers a noticeable reduction in light pollution under Bortle 4 skies. This destination provides a far more conducive setting for deep-sky pursuits, making the effort worthwhile for dedicated astronomers.

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
AbraĆ£o, Rio de Janeiro sits about 108 km west south west and reaches Bortle 4, roughly 24x darker.
Good dark window
Rio de Janeiro retains astronomical darkness throughout the year, so seasonality is less extreme than at higher latitudes. The main limitation is light pollution, not the length of the dark window.

Frequently Asked Questions

Can you see the Milky Way from Rio de Janeiro?

No. Rio de Janeiro is a Bortle Class 9 sky with SQM 17.59, 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 Rio de Janeiro?

Rio de Janeiro is Bortle Class 9 (SQM 17.59), a severe urban sky for astronomy.

Is Rio de Janeiro good for stargazing?

Not for serious deep-sky observing. Rio de Janeiro is a severe urban sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.

Is Rio de Janeiro good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Rio de Janeiro and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Rio de Janeiro without careful processing.

What can you observe from Rio de Janeiro?

Primary targets from Rio de Janeiro 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 Rio de Janeiro?

The closest meaningfully darker mapped site is Sardoal, Rio de Janeiro, about 63 km west south west of Rio de Janeiro, reaching Bortle 6.

When is the sky darkest in Rio de Janeiro?

The sky over Rio de Janeiro is darkest around June, July.

Is light pollution in Rio de Janeiro getting better or worse?

Long-term light pollution over Rio de Janeiro has been broadly stable across the available measurements.

north - marginal

Persistent skyglow on the north horizon. Faint stars near the ground in this direction are lost.

north-north-east - fair

The north-north-east horizon shows a slight brightening. Workable for most targets above about 10 degrees elevation.

north-east - marginal

Persistent skyglow on the north-east horizon. Faint stars near the ground in this direction are lost.

east-north-east - marginal

Moderate brightening on the east-north-east horizon. Star counts at low elevation here are reduced.

east - marginal

Persistent skyglow on the east horizon. Faint stars near the ground in this direction are lost.

east-south-east - marginal

The east-south-east horizon is brighter than natural. Faint stars are suppressed up to roughly 15-20 degrees elevation.

south-east - fair

Mild brightening on the south-east horizon. Faint stars at the very lowest elevation are dimmed; otherwise unaffected.

south-south-east - fair

Subtle skyglow on the south-south-east horizon. Faint stars below about 10 degrees here are slightly suppressed.

south - fair

A small artificial brightening near the south horizon. Star counts in this direction remain high above the lowest elevations.

south-south-west - fair

The south-south-west horizon is mostly dark with a hint of light pollution. Faint stars are accessible above about 10 degrees.

south-west - marginal

Moderate brightening on the south-west horizon. Star counts at low elevation here are reduced.

west-south-west - marginal

The lower west-south-west sky is moderately light-polluted. Useful for bright targets above about 20 degrees only.

west - poor

Bright skyglow dominates the lower west sky. This direction is not suitable for faint-object work at low elevation.

west-north-west - poor

The west-north-west horizon is bright with artificial light. Only stars brighter than magnitude 3 are visible at low elevation.

north-west - poor

Bright skyglow dominates the lower north-west sky. This direction is not suitable for faint-object work at low elevation.

north-north-west - marginal

The lower north-north-west sky is moderately light-polluted. Useful for bright targets above about 20 degrees only.

zenith - poor

Heavy skyglow overhead. A few dozen stars and the brightest planets are accessible to the naked eye.

  • Sardoal, Rio de Janeiro
    Direction
    WSW
    Distance (km)
    62.6
    SQM
    19.92
    Bortle
    6
  • Vassouras, Rio de Janeiro
    Direction
    NW
    Distance (km)
    70.7
    SQM
    20.07
    Bortle
    6
  • AbraĆ£o, Rio de Janeiro
    Direction
    WSW
    Distance (km)
    107.5
    SQM
    21.02
    Bortle
    4
  • JamaparĆ”, Rio de Janeiro
    Direction
    NNE
    Distance (km)
    114.7
    SQM
    20.70
    Bortle
    5
  • Santana do Deserto, Minas Gerais
    Direction
    S
    Distance (km)
    114.4
    SQM
    20.56
    Bortle
    5
  • Rio Dourado, Rio de Janeiro
    Direction
    ENE
    Distance (km)
    126.8
    SQM
    20.11
    Bortle
    6