Johannesburg Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.63

Bortle class

Class 8 (Class 8)

Darkness Quotient

29%

Dataset

April 2026

City sky

Johannesburg: The Practical Verdict

Johannesburg, a major urban centre in South Africa's Gauteng province, is heavily affected by light pollution typical of large cities. The overall quality of the night sky here is poor for stargazing, with high light pollution severely limiting visibility of faint objects.

The sky offers some options for viewing the Moon, planets, and the brightest stars. Double stars and solar system events remain feasible. Deep-sky observations of nebulae and galaxies are not practical, as the urban brightness overwhelms faint detail. Imaging can be pursued in narrowband filters with care but broadband methods struggle.

For those seeking darker skies, Lekwa Ward 9 in Mpumalanga, located about 130 km east-south-east, provides a notable upgrade. This area offers Bortle 4 conditions, opening up deep-sky possibilities that Johannesburg itself cannot.

At a Glance

Overall

Poor city sky - This is a poor city sky. The Milky Way is not visible and most deep-sky observing is unrealistic from the location itself.

Milky Way

Not visible - The Milky Way is erased by the bright urban sky background.

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

Lekwa Ward 9, Mpumalanga sits about 128 km east south east and reaches Bortle 4, roughly 7.7x darker.

Good dark window

Johannesburg's longest dark windows fall in June and July, with the shortest nights around December and January. For deep-sky imaging, winter gives the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from Johannesburg?

No. Johannesburg is a Bortle Class 8 sky with SQM 18.63, 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 Johannesburg?

Johannesburg is Bortle Class 8 (SQM 18.63), a poor city sky for astronomy.

Is Johannesburg good for stargazing?

Not for serious deep-sky observing. Johannesburg is a poor city sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.

Is Johannesburg good for astrophotography?

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

What can you observe from Johannesburg?

Primary targets from Johannesburg 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 Johannesburg?

The closest meaningfully darker mapped site is Ventersdorp Ward 5, North West, about 102 km west south west of Johannesburg, reaching Bortle 5.

When is the sky darkest in Johannesburg?

The sky over Johannesburg is darkest around June, July.

Is light pollution in Johannesburg getting better or worse?

There is not yet enough long-term data to give a confident trend for Johannesburg.

• Ventersdorp Ward 5, North West

  Direction

  WSW

  Distance (km)

  102.1

  SQM

  20.47

  Bortle

  5

• Lekwa Ward 9, Mpumalanga

  Direction

  ESE

  Distance (km)

  127.9

  SQM

  20.85

  Bortle

  4

• Ntwane, Limpopo

  Direction

  ENE

  Distance (km)

  157.9

  SQM

  20.58

  Bortle

  5