Orange Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

19.40

Bortle class

Class 7 (Class 7)

Darkness Quotient

38%

Dataset

March 2026

Suburban/urban transition

Orange: The Practical Verdict

Orange is a regional inland city in the Central West of New South Wales, known for its elevated setting, cool-climate vineyards and strong country-town character.

With a Darkness Quotient of 38%, Orange sits in the High Light Pollution tier — brighter than many smaller rural towns, but still noticeably darker than the biggest metropolitan centres.

In practical terms, the most reliable targets from within the city are the Moon, planets, double stars and the brightest open clusters. A few showpiece deep-sky objects can still be attempted, but faint galaxies, dim nebulae and the richer structure of the Milky Way are largely washed out by the urban glow.

Orange is in a stronger position than its overall city-centre reading might suggest, because substantially darker skies appear quite quickly once you head out of town. The nearest really dark option in the supplied site list is about 140 kilometres to the south-south-east, near Near Upper Lachlan Shire Council, New South Wales, while several directions become much darker within a short drive from the city itself.

The map shows Orange as a concentrated bright core, with a pink-white centre surrounded by red, orange and yellow light spreading into the nearby countryside. That makes the city stand out clearly from its surroundings, but the glow is also fairly compact rather than sprawling across the whole region.

Away from the urban patch, the scene darkens rapidly into blue, grey and then near-black areas, especially to the west and north-west, where the background looks much less affected by large neighbouring light domes. Other smaller settlements appear as scattered isolated pools of light rather than one continuous urban corridor.

Overall, Orange looks bright against its immediate surroundings but also somewhat isolated, which is good news for observers willing to leave the city lights behind. The general pattern suggests that once you are clear of the built-up area, the sky quality improves quickly in many directions.

What the overhead sky is like

Looking straight up from Orange, the zenith sits in Bortle 7 territory, which means the sky overhead is noticeably brightened even when conditions are otherwise clear and moonless. Familiar constellations remain easy enough to trace, but the background sky lacks the rich dark contrast you would want for faint detail.

This is the sort of sky where brighter stars still stand out well and the main seasonal patterns are straightforward to recognise, yet the subtler star fields look thinned out. The Milky Way is not likely to show strong structure from the city centre, and any low-contrast deep-sky target will struggle against the skyglow.

Even so, Orange is not completely overwhelmed by light pollution overhead. Brighter telescopic targets remain rewarding, and the city benefits from much darker skies appearing relatively quickly once you move away from the urban core.

• Near New South Wales

  Direction

  NW

  Distance (km)

  257.2

  SQM

  21.85

  Bortle

  2

  Milky Way, faint nebulae, deep-sky imaging

• Near New South Wales

  Direction

  SSW

  Distance (km)

  257

  SQM

  21.81

  Bortle

  2

  Milky Way, faint nebulae, deep-sky imaging

• Near Upper Lachlan Shire Council, New South Wales

  Direction

  SSE

  Distance (km)

  139.7

  SQM

  21.61

  Bortle

  3

  Milky Way visible, broadband DSO imaging

Historical Light Pollution Trends

The long-term trend points to a modest brightening of the night sky over time. Orange's SQM has shifted from 19.73 in the earliest record to 19.4 in the latest one, a change consistent with gradually increasing skyglow rather than a sudden jump.

Across 76 datasets, the average reading is 19.53, with values ranging from 19.29 to 19.76. That is a fairly tight spread, suggesting that while conditions vary a little from one dataset to another, Orange has remained broadly in the same general observing bracket.

The underlying trend slope of -0.0212 SQM per year is gentle but still points in the wrong direction for urban stargazing. In plain terms, the city sky appears to be getting a little brighter over the years, making faint deep-sky observing incrementally harder from within town.