Cheltenham Stargazing & Astronomy Report

Light pollution and stargazing locations near Cheltenham

City
Cheltenham
Country
United Kingdom
Latitude
51.8994
Longitude
-2.0783

Key Sky Quality Metrics

SQM (mag/arcsec²)
19.29
Bortle class
Class 7 (Class 7)
Darkness Quotient
37%
Dataset
May 2026

Suburban/urban transition

Cheltenham: The Practical Verdict

Cheltenham is a small city in Gloucestershire with suburban surroundings. Unfortunately, it is affected by high light pollution, making it a poor location for serious stargazing, and the Milky Way is not visible here. The primary limiting factor is the dense light pollution, which affects overall sky quality.

From within Cheltenham, the best observational targets are the Moon, planets, and bright double stars. Narrowband imaging is possible with careful processing, and bright open clusters can be observed. However, deep-sky visuals, broadband galaxies, and faint nebulae remain elusive in this setting.

For those seeking darker skies, Boxen bower to the north-west promises a much better experience, being around a two-hour drive from Cheltenham. It's a significant improvement for deep-sky observing.

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
Boxen bower sits about 99 km north west and reaches Bortle 4, roughly 5.8x darker.
Moderate dark window
Cheltenham's limiting factor is not only light pollution. Around midsummer, Cheltenham 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 Cheltenham?

No. Cheltenham is a Bortle Class 7 sky with SQM 19.29, 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 Cheltenham?

Cheltenham is Bortle Class 7 (SQM 19.29), a poor urban/suburban sky for astronomy.

Is Cheltenham good for stargazing?

Not for serious deep-sky observing. Cheltenham 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 Cheltenham good for astrophotography?

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

What can you observe from Cheltenham?

Primary targets from Cheltenham 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 Cheltenham?

The closest meaningfully darker mapped site is Fladbury, about 24 km north north east of Cheltenham, reaching Bortle 5.

When is the sky darkest in Cheltenham?

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

Is light pollution in Cheltenham getting better or worse?

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

north - good

No visible glow on the north horizon. Stars are clear down to low elevation in this direction.

north-north-east - good

The north-north-east horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

north-east - excellent

No skyglow to the north-east. Stars are visible to the naked-eye limit at all elevations in this direction.

east-north-east - excellent

The east-north-east sky is dark to the horizon with no visible artificial brightening. Faint extended objects are accessible at low elevation.

east - excellent

No skyglow to the east. Stars are visible to the naked-eye limit at all elevations in this direction.

east-south-east - excellent

No visible light pollution in the east-south-east direction. The Milky Way structure is visible into this quarter on transparent nights.

south-east - excellent

Fully dark sky to the south-east. This is among the cleaner directions from this site.

south-south-east - excellent

The south-south-east sky is dark to the horizon with no visible artificial brightening. Faint extended objects are accessible at low elevation.

south - excellent

The south sky is dark to the horizon with no visible artificial brightening. Faint extended objects are accessible at low elevation.

south-south-west - good

The south-south-west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

south-west - good

Clean, dark sky to the south-west. No visible artificial light source affects this quarter.

west-south-west - good

No visible glow on the west-south-west horizon. Stars are clear down to low elevation in this direction.

west - good

Clean horizon to the west. Star counts remain high near the ground.

west-north-west - good

The west-north-west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

north-west - good

Clean horizon to the north-west. Star counts remain high near the ground.

north-north-west - good

The north-north-west sky shows no obvious glow at ground level. Faint stars are clear at low elevation.

zenith - fair

The zenith sky is brighter than a true dark site. The Milky Way is not detectable to the unaided eye.

  • Hidcote Boyce
    Direction
    NE
    Distance (km)
    28.3
    SQM
    20.74
    Bortle
    5
  • Fladbury
    Direction
    NNE
    Distance (km)
    24.4
    SQM
    20.38
    Bortle
    5
  • Over Worton
    Direction
    E
    Distance (km)
    48.1
    SQM
    20.66
    Bortle
    5
  • 76 km S
    Direction
    S
    Distance (km)
    75.9
    SQM
    20.99
    Bortle
    4
  • Cradoc
    Direction
    W
    Distance (km)
    93.5
    SQM
    21.16
    Bortle
    4
  • Boxen bower
    Direction
    NW
    Distance (km)
    99.3
    SQM
    21.20
    Bortle
    4