Rochester Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.70

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

July 2026

Inner city sky

Rochester: The Practical Verdict

Rochester, a major city in New York, USA, poses difficulties for stargazing due to its severe urban glow. The sky is classified as Bortle 9, indicative of an inner city sky with extreme light pollution. Consequently, observational astronomy is limited, with the Milky Way completely hidden from view.

From within Rochester, your best observational choices are the Moon, planets, and bright stars, along with double stars and solar system events. Narrowband imaging is possible, though it requires caution due to the high sky brightness. Avoid attempting visual deep-sky observing or trying to spot reflection nebulae and broadband galaxies, as the light pollution obscures these faint objects entirely.

Fortunately, a darker site is just a short drive away, about 50 km to the north north east. This location, classified as Bortle 4, offers a much-improved dark sky, making it well worth the trip for more serious stargazing enthusiasts.

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

50 km NNE 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 50 km NNE, 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?

There is not yet enough long-term data to give a confident trend for Rochester.

• 50 km NNE

  Direction

  NNE

  Distance (km)

  50

  SQM

  21.19

  Bortle

  4

• 66 km E

  Direction

  E

  Distance (km)

  66.2

  SQM

  20.58

  Bortle

  5

• 155 km SSE

  Direction

  SSE

  Distance (km)

  154.5

  SQM

  20.89

  Bortle

  4

• 169 km SW

  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