Rochester Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.70

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

August 2026

Inner city sky

Rochester: The Practical Verdict

Rochester, located in New York, is a major city with a bright, urban-dense environment. The stargazing experience here is under a severe urban sky, significantly restricted due to high light pollution. The primary challenge is the light dome dominating the city, especially from the east-south-east.

From Rochester, the Milky Way is not visible and deep-sky observing is impractical. Observing is best limited to bright targets such as the Moon, planets, and some double stars. Any attempts at imaging need to be focused on narrowband techniques, as broadband imaging will suffer from overwhelming gradients and sky brightness.

For darker skies, Monroe County is a suitable upgrade. Located about 50 km north-north-east, it provides a noticeably clearer sky, ideal for more serious deep-sky observations.

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

Monroe County, New York sits about 50 km north north east and reaches Bortle 4, roughly 25x darker.

Good dark window

Rochester'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 Rochester?

No. Rochester is a Bortle Class 9 sky with SQM 17.70, 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 Rochester?

Rochester is Bortle Class 9 (SQM 17.70), a severe urban sky for astronomy.

Is Rochester good for stargazing?

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

Is Rochester good for astrophotography?

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

What can you observe from Rochester?

Primary targets from Rochester 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 Rochester?

The closest meaningfully darker mapped site is Monroe County, New York, about 50 km north north east of Rochester, reaching Bortle 4.

When is the sky darkest in Rochester?

The sky over Rochester is darkest around January, December.

Is light pollution in Rochester getting better or worse?

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

• Monroe County, New York

  Direction

  NNE

  Distance (km)

  50

  SQM

  21.19

  Bortle

  4

• Town of Savannah, New York

  Direction

  E

  Distance (km)

  66.2

  SQM

  20.58

  Bortle

  5

• Columbia Township, Pennsylvania

  Direction

  SSE

  Distance (km)

  154.5

  SQM

  20.89

  Bortle

  4

• Town of South Valley, New York

  Direction

  SW

  Distance (km)

  169.2

  SQM

  21.01

  Bortle

  4

• Wharton, Pennsylvania

  Direction

  S

  Distance (km)

  186.2

  SQM

  20.97

  Bortle

  4

• Harpursville, New York

  Direction

  SE

  Distance (km)

  196.6

  SQM

  20.81

  Bortle

  4