Costilla Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

21.85

Bortle class

Class 2 (Class 2)

Darkness Quotient

95%

Dataset

July 2026

Typical truly dark site

Costilla: The Practical Verdict

Costilla, situated in a remote area of the United States, offers a pristine dark sky experience. The site's overall darkness is rated as very strong, making it an excellent location for stargazing. Limited human development ensures minimal light pollution, allowing the night skies to reveal their true splendour.

The Milky Way is clearly visible from Costilla, making it a prime attraction on moonless nights. Visitors will see a rich array of galaxies, nebulae, and star clusters. Additionally, this location is perfect for broadband imaging and nightscape photography due to its minimal artificial light interference.

As one of the darkest spots within the region, Costilla does not require travel for better sky conditions as it stands robust on its own. This makes it an ideal destination for serious astronomers aiming to observe deep-sky objects without the need for further travel.

At a Glance

Overall

Very strong dark sky - This is a very strong dark-sky location where the Milky Way, faint stars, nebulae, and galaxies are realistically accessible.

Milky Way

Clearly visible - The Milky Way should be prominent on moonless nights, with visible structure and strong contrast.

Best targets from here

Milky Way, galaxies, nebulae, globular clusters, open clusters, meteor showers

Do not prioritise

none due to light pollution alone

Already a strong sky

Costilla is already a strong astronomy location. There is no obvious reason to travel for a darker sky.

Long dark window

Costilla'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 Costilla?

Yes. Costilla reaches Bortle 2, dark enough that the Milky Way is clearly visible on clear, moonless nights.

What Bortle class is Costilla?

Costilla is Bortle Class 2 (SQM 21.85), a very strong dark sky for astronomy.

Is Costilla good for stargazing?

Yes. Costilla is a very strong dark sky and supports serious stargazing including deep-sky observing.

Is Costilla good for astrophotography?

Broadband deep-sky imaging is realistic from Costilla. Narrowband imaging of bright emission nebulae remains viable from Costilla with appropriate Ha or OIII filters.

What can you observe from Costilla?

Primary targets from Costilla include Milky Way, galaxies, nebulae, globular clusters, open clusters. Targets such as none due to light pollution alone are not realistic from this sky.

Where are darker skies near Costilla?

No meaningfully darker mapped site was found within the search radius around Costilla.

When is the sky darkest in Costilla?

The sky over Costilla is darkest around January, December.

Is light pollution in Costilla getting better or worse?

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

• 25 km ENE

  Direction

  ENE

  Distance (km)

  25

  SQM

  21.86

  Bortle

  2

• 165 km WNW

  Direction

  WNW

  Distance (km)

  164.5

  SQM

  21.86

  Bortle

  2