Round Rock Stargazing & Astronomy Report

Light pollution and stargazing locations near Round Rock

City
Round Rock
Country
United States
Latitude
30.5083
Longitude
-97.6789

Key Sky Quality Metrics

SQM (mag/arcsec²)
18.18
Bortle class
Class 8 (Class 8)
Darkness Quotient
24%
Dataset
August 2026

City sky

Round Rock: The Practical Verdict

Round Rock is a small city in Texas with a suburban setting. Astronomy quality here is generally poor due to significant light pollution, falling under the high light pollution tier. Consequently, the brightness from the nearby city of Austin contributes to a sky where only the brightest celestial objects can be discerned.

From this location, the Milky Way is completely erased by the urban sky glow, while everyday targets like the Moon, planets, and bright stars remain prominent. Observing in Round Rock should focus primarily on these brighter targets or maximise narrowband imaging opportunities. Deep-sky exploration is best avoided due to abundant sky background and limited visibility.

For a significant improvement, Concho County, Texas, provides a better stargazing opportunity, located roughly west-north-west. This site offers a darker sky suitable for more serious astronomical pursuits, including deep-sky observing, which is currently unfeasible in Round Rock.

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
Concho County, Texas sits about 215 km west north west and reaches Bortle 4, roughly 14x darker.
Good dark window
Round Rock's longest dark windows fall in December and January, with the shortest nights around June and July. Plan deep-sky sessions around the autumn and winter months for the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from Round Rock?

No. Round Rock is a Bortle Class 8 sky with SQM 18.18, 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 Round Rock?

Round Rock is Bortle Class 8 (SQM 18.18), a poor city sky for astronomy.

Is Round Rock good for stargazing?

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

Is Round Rock good for astrophotography?

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

What can you observe from Round Rock?

Primary targets from Round Rock 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 Round Rock?

The closest meaningfully darker mapped site is Salty, Texas, about 47 km east north east of Round Rock, reaching Bortle 6.

When is the sky darkest in Round Rock?

The sky over Round Rock is darkest around January, December.

Is light pollution in Round Rock getting better or worse?

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

north - marginal

Soft skyglow visible on the north horizon. Mid-brightness stars survive at low elevation; the faintest do not.

north-north-east - fair

A faint diffuse glow on the north-north-east horizon. Stars are visible to low elevation, with minor losses near the ground.

north-east - fair

A faint diffuse glow on the north-east horizon. Stars are visible to low elevation, with minor losses near the ground.

east-north-east - fair

Faint glow on the east-north-east horizon. Most stars are visible to low elevation; only the faintest near the ground are affected.

east - fair

A faint diffuse glow on the east horizon. Stars are visible to low elevation, with minor losses near the ground.

east-south-east - fair

A faint diffuse glow on the east-south-east horizon. Stars are visible to low elevation, with minor losses near the ground.

south-east - marginal

Soft skyglow visible on the south-east horizon. Mid-brightness stars survive at low elevation; the faintest do not.

south-south-east - marginal

A diffuse glow sits on the south-south-east horizon. Faint objects below 20 degrees in this direction are compromised.

south - marginal

A diffuse glow sits on the south horizon. Faint objects below 20 degrees in this direction are compromised.

south-south-west - poor

The lower south-south-west sky is heavily light-polluted. Only the brightest stars stand out near the horizon.

south-west - marginal

A diffuse glow sits on the south-west horizon. Faint objects below 20 degrees in this direction are compromised.

west-south-west - marginal

Soft skyglow visible on the west-south-west horizon. Mid-brightness stars survive at low elevation; the faintest do not.

west - marginal

The west lower sky is measurably brighter than the darker quarters. Limit faint work to above about 20 degrees here.

west-north-west - marginal

The west-north-west sky shows a clear glow near the ground. Above about 20 degrees the sky returns to workable.

north-west - fair

Light glow detectable on the north-west horizon. The effect fades quickly with elevation and does not affect overhead work.

north-north-west - fair

Light glow detectable on the north-north-west horizon. The effect fades quickly with elevation and does not affect overhead work.

zenith - marginal

The overhead sky is too bright for faint-object work. Bright stars, planets, and the brighter clusters are accessible.

  • Salty, Texas
    Direction
    ENE
    Distance (km)
    47.2
    SQM
    20.02
    Bortle
    6
  • Phillips, Texas
    Direction
    ENE
    Distance (km)
    126
    SQM
    20.82
    Bortle
    4
  • Iron Bridge Road, Texas
    Direction
    ESE
    Distance (km)
    103.4
    SQM
    20.19
    Bortle
    6
  • Rock Island, Texas
    Direction
    SE
    Distance (km)
    150.3
    SQM
    20.49
    Bortle
    5
  • Chipley, Texas
    Direction
    SSE
    Distance (km)
    197.1
    SQM
    20.83
    Bortle
    4
  • Concho County, Texas
    Direction
    WNW
    Distance (km)
    215.4
    SQM
    21.05
    Bortle
    4