Gloucester Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.97

Bortle class

Class 7 (Class 7)

Darkness Quotient

33%

Dataset

April 2026

Suburban/urban transition

Gloucester: The Practical Verdict

Gloucester, a small city in Gloucestershire, offers a highly light-polluted sky which is classified as Bortle 7. Observing opportunities are limited, with the Milky Way not visible at all and deep-sky targets such as broad-band galaxies and faint meteors inaccessible.

From within Gloucester, observations should focus on the Moon, planets, bright double stars, and notable open clusters. Narrowband imaging of bright nebulae may be achievable with careful processing, but the overall conditions challenge astronomers seeking more detailed targets.

To improve your experience significantly, a trip to Merthyr Cynog, about 90 km to the west, is recommended. This site offers a darker Bortle 4 sky and is much better suited for serious deep-sky astronomy and detailed imaging tasks.

At a Glance

Overall

Poor urban/suburban sky - This is a poor sky for astronomy. The Moon, planets, and a few bright objects remain viable, but deep-sky work is difficult.

Milky Way

Not visible - The Milky Way is not realistically visible from this level of light pollution.

Best targets from here

Moon, planets, bright double stars, bright open clusters, narrowband imaging with careful processing

Do not prioritise

visual deep-sky observing, broadband galaxies, reflection nebulae, Milky Way photography

Best nearby upgrade

Merthyr Cynog sits about 88 km west and reaches Bortle 4, roughly 7.7x darker.

Moderate dark window

Gloucester's limiting factor is not only light pollution. Around midsummer, Gloucester 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 Gloucester?

No. Gloucester is a Bortle Class 7 sky with SQM 18.97, 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 Gloucester?

Gloucester is Bortle Class 7 (SQM 18.97), a poor urban/suburban sky for astronomy.

Is Gloucester good for stargazing?

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

Is Gloucester good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Gloucester and a Bortle 4 or darker site is strongly recommended. Narrowband imaging of bright emission nebulae remains viable from Gloucester with appropriate Ha or OIII filters.

What can you observe from Gloucester?

Primary targets from Gloucester include Moon, planets, bright double stars, bright open clusters, narrowband imaging with careful processing. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.

Where are darker skies near Gloucester?

The closest meaningfully darker mapped site is Cyncoed, about 42 km west south west of Gloucester, reaching Bortle 5.

When is the sky darkest in Gloucester?

The sky over Gloucester is darkest around January, December. Significant summer limitation: around 63 nights per year have no true astronomical darkness.

Is light pollution in Gloucester getting better or worse?

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

• Cyncoed

  Direction

  WSW

  Distance (km)

  41.8

  SQM

  20.67

  Bortle

  5

• Spelsbury

  Direction

  E

  Distance (km)

  54.8

  SQM

  20.57

  Bortle

  5

• Merthyr Cynog

  Direction

  W

  Distance (km)

  88.3

  SQM

  21.19

  Bortle

  4

• Durley

  Direction

  SE

  Distance (km)

  67.8

  SQM

  20.65

  Bortle

  5

• Whitbourne Springs

  Direction

  S

  Distance (km)

  75.1

  SQM

  20.82

  Bortle

  4

• Montgomery

  Direction

  NW

  Distance (km)

  99.6

  SQM

  21.15

  Bortle

  4