Corona Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.92

Bortle class

Class 9 (Class 9)

Darkness Quotient

22%

Dataset

August 2026

Inner city sky

Corona: The Practical Verdict

Corona is a small city in the United States with a suburban environment that presents a severe challenge for stargazers. The sky here is classified under high light pollution due to its severe urban sky, meaning that the Milky Way is not visible. Light pollution is the primary constraint for observers.

Under these conditions, the most practical targets are the Moon, planets, bright stars, and double stars, as these objects can pierce through the light dome. While narrowband imaging is feasible with care, deep-sky objects like broadband galaxies and reflection nebulae are best avoided.

For serious stargazing, it is worth considering a trip. A site 195 km to the west-south-west offers dramatically better conditions with a Bortle 2 classification, making it an ideal spot for deep-sky observation for those willing to take a longer drive.

At a Glance

Overall

Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.

Milky Way

Not visible - The Milky Way is not visible from this sky.

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

195 km WSW sits about 195 km west south west and reaches Bortle 2, roughly 33x darker.

Good dark window

Corona'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 Corona?

No. Corona is a Bortle Class 9 sky with SQM 17.92, 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 Corona?

Corona is Bortle Class 9 (SQM 17.92), a severe urban sky for astronomy.

Is Corona good for stargazing?

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

Is Corona good for astrophotography?

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

What can you observe from Corona?

Primary targets from Corona 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 Corona?

The closest meaningfully darker mapped site is 31 km S, about 31 km south of Corona, reaching Bortle 6.

When is the sky darkest in Corona?

The sky over Corona is darkest around January, December.

Is light pollution in Corona getting better or worse?

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

• 31 km S

  Direction

  S

  Distance (km)

  31.1

  SQM

  19.71

  Bortle

  6

• 99 km WSW

  Direction

  WSW

  Distance (km)

  98.8

  SQM

  20.89

  Bortle

  4

• 140 km SW

  Direction

  SW

  Distance (km)

  140

  SQM

  21.65

  Bortle

  3

• 195 km WSW

  Direction

  WSW

  Distance (km)

  195

  SQM

  21.72

  Bortle

  2

• 203 km W

  Direction

  W

  Distance (km)

  202.6

  SQM

  21.67

  Bortle

  3

• 268 km W

  Direction

  W

  Distance (km)

  268

  SQM

  21.70

  Bortle

  2