Largest Optical Telescopes in the World 2026

Source: Wikipedia, List of largest optical reflecting telescopes

Largest Optical Telescopes in the World 2026

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Key Findings

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Large Binocular Telescope (LBT) leads in Effective Aperture (m) with 11.90 in 2026.

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Average Effective Aperture (m) in 2026: 9.13 · median: 8.20.

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Gap in 2026: Large Binocular Telescope (LBT) is 1.5× larger than Gemini South.

About This Dataset

Largest Optical Telescopes in the World 2026

Reflecting telescopes ranked by effective aperture in metres - the width of the light-collecting mirror, which sets how faint an object the instrument can see. Some entries combine several mirrors working together, so their effective aperture is larger than any single mirror they carry.

Analysis

Large Binocular Telescope (LBT) has the largest effective aperture at 11.9 m, ahead of Gran Telescopio Canarias (GTC) on 10.4 m. 1 of the 13 reaches its figure by combining separate mirrors rather than with one piece of glass. Apertures on this chart run from 8.1 m to 11.9 m, a spread of just 3.8 m - collecting area rises with the square of aperture, so that gap is larger than it looks. 8 of them list the United States among their sponsors.

Data Insights Below

Data Insights

Numbers, trends & sources behind this chart

Admin

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Data Points

13 categories · 1 year

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Top Value

11.90

Large Binocular Telescope (LBT)

Effective Aperture (m) · 2026

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Metrics

Effective Aperture (m)

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Period

2026

Single year snapshot

Methodology & source

Data source: Wikipedia, List of largest optical reflecting telescopes
Coverage: 13 entities · 2026 · 13 observations
Measure: Effective Aperture (m)
Last updated: 7 September 2026
Compiled by: The ANYSTAT team, from the source above

How the figures are calculated

Values use the measure and unit named on this page. Consult the dataset description and cited source for coverage, definitions and any unit conversions. Displayed values may be rounded for readability.
Entities are ranked highest-first on their value in 2026.

Rankings & Full Data

13 records · Effective Aperture (m) · ranked by 2026

✓ 13 sourced

#	Category	2026
🥇	Large Binocular Telescope (LBT)	11.90
🥈	Gran Telescopio Canarias (GTC)	10.40
🥉	Hobby-Eberly Telescope (HET)	10
4	Keck 1	10
5	Keck 2	10
6	Southern African Large Telescope (SALT)	9.20
7	Subaru (JNLT)	8.20
8	VLT UT1 - Antu	8.20
9	VLT UT2 - Kueyen	8.20
10	VLT UT3 - Melipal	8.20
11	VLT UT4 - Yepun	8.20
12	Gemini North (Gillett)	8.10
13	Gemini South	8.10

Data Sources & References

All external sources cited in this dataset

1 https://en.wikipedia.org/wiki/List_of_largest_optical_reflecting_telescopes Visit ↗

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APA

ANYSTAT. (2026). Largest Optical Telescopes in the World 2026 [Data set]. Data: Wikipedia, List of largest optical reflecting telescopes. https://anystat.ai/stats/1661/largest-optical-telescopes-in-the-world-2026-1788798336

MLA

"Largest Optical Telescopes in the World 2026." ANYSTAT, 7 Sep. 2026, https://anystat.ai/stats/1661/largest-optical-telescopes-in-the-world-2026-1788798336.

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<a href="https://anystat.ai/stats/1661/largest-optical-telescopes-in-the-world-2026-1788798336">Largest Optical Telescopes in the World 2026</a> (ANYSTAT)

Largest Optical Telescopes in the World 2026