Preston Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.69

Bortle class

Class 8 (Class 8)

Darkness Quotient

30%

Dataset

July 2026

City sky

Preston: The Practical Verdict

Preston is a small city in the United Kingdom with a suburban environment. The stargazing quality here is generally poor due to high light pollution, which results in a city sky rated Bortle Class 8. With the Milky Way completely erased from view, only the brightest celestial objects can be observed effectively.

The available targets in Preston's night sky are limited to the Moon, planets, bright stars, and double stars. Narrowband imaging might work with caution, but visual deep-sky observing is practically impossible in this environment. Targets like broadband galaxies and faint nebulae should be avoided due to the bright sky background.

For those seeking better skies, significant improvements can be found around 120 km to the west-south-west, offering a much darker Bortle 3 experience. This nearby destination would be worth the drive for more dedicated deep-sky observations.

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

120 km WSW sits about 120 km west south west and reaches Bortle 3, roughly 13x darker.

Moderate dark window

Preston's limiting factor is not only light pollution. Around midsummer, Preston loses true astronomical darkness entirely, so deep-sky observing and imaging are strongly seasonal. Plan serious sessions around the darker months.

Frequently Asked Questions

Can you see the Milky Way from Preston?

No. Preston is a Bortle Class 8 sky with SQM 18.69, 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 Preston?

Preston is Bortle Class 8 (SQM 18.69), a poor city sky for astronomy.

Is Preston good for stargazing?

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

Is Preston good for astrophotography?

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

What can you observe from Preston?

Primary targets from Preston 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 Preston?

The closest meaningfully darker mapped site is 15 km NW, about 15 km north west of Preston, reaching Bortle 5.

When is the sky darkest in Preston?

The sky over Preston is darkest around January, December. Significant summer limitation: around 80 nights per year have no true astronomical darkness.

Is light pollution in Preston getting better or worse?

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

• 15 km NW

  Direction

  NW

  Distance (km)

  15.2

  SQM

  20.53

  Bortle

  5

• 19 km SW

  Direction

  SW

  Distance (km)

  19.4

  SQM

  20.04

  Bortle

  6

• 78 km NNW

  Direction

  NNW

  Distance (km)

  77.5

  SQM

  20.76

  Bortle

  5

• 120 km WSW

  Direction

  WSW

  Distance (km)

  119.7

  SQM

  21.45

  Bortle

  3

• 86 km NE

  Direction

  NE

  Distance (km)

  86.1

  SQM

  20.61

  Bortle

  5

• 131 km WNW

  Direction

  WNW

  Distance (km)

  131.3

  SQM

  21.60

  Bortle

  3