Preston Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.88

Bortle class

Class 8 (Class 8)

Darkness Quotient

32%

Dataset

August 2026

City sky

Preston: The Practical Verdict

Preston, a small city in Lancashire, is noticeably affected by urban lighting, making it challenging for any substantial astronomical observation. The city is gripped by high light pollution, rendering it a poor sky for deep-sky astronomy. The eastern horizon is notably brighter than others, further hampering visibility.

The sky over Preston erases the Milky Way and limits visibility to bright objects only. Observing is best focused on the Moon, planets, and bright stars. Double stars and solar system events remain prime targets, while more ambitious deep-sky viewing is greatly reduced. Attempting to capture dim targets or broad structures with a telescope or camera will be hindered by city glare.

For more serious observing, a trip to Llangefni towards the west south-west, roughly 120 km away, offers a meaningfully darker sky. This site will provide a significantly better opportunity to observe fainter deep-sky objects.

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

Llangefni sits about 120 km west south west and reaches Bortle 3, roughly 10x 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 18.88, 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 18.88), 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 Nateby, about 16 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?

Long-term light pollution over Preston has been broadly stable across the available measurements.

• Nateby

  Direction

  NW

  Distance (km)

  15.9

  SQM

  20.47

  Bortle

  5

• Scarisbrick

  Direction

  SW

  Distance (km)

  19.1

  SQM

  20.10

  Bortle

  6

• Llangefni

  Direction

  WSW

  Distance (km)

  119.6

  SQM

  21.39

  Bortle

  3

• Braddan

  Direction

  WNW

  Distance (km)

  131.3

  SQM

  21.59

  Bortle

  3

• Alston Moor

  Direction

  NE

  Distance (km)

  121.5

  SQM

  21.31

  Bortle

  3

• Dishforth

  Direction

  ENE

  Distance (km)

  95.2

  SQM

  20.59

  Bortle

  5