24°18′N · 9°32′E — Tassili Plateau, Sahara

Beneath the Darkest Skies on Earth

At the edge of the world's greatest desert, where atmospheric water vapor drops to near zero and light pollution is a hundred kilometers distant, the Saharan Astronomy Observatory peers deeper into the cosmos than any land-based facility in the Northern Hemisphere.

Plan Your Night Explore the Telescope
Our Instruments

Eyes on
the Infinite

Five primary instruments work in concert, each calibrated for a different window into the deep universe. From radio wavelengths that pierce interstellar dust to optical systems resolving exoplanet transits — the observatory operates as an integrated astronomical platform.

The main telescope dome at Saharan Observatory
SAO-1 Primary · 4.2m Reflector

SAO-1 Optical Telescope

A 4.2-meter Ritchey-Chrétien reflector with active optics, designed for deep-field imaging and spectroscopic surveys. Resolves objects down to magnitude 28 in a 30-minute exposure.

4.2 meters primary mirror

High-Resolution Spectrograph

The SAO-HRS captures stellar spectra at R=120,000 resolution, enabling precise radial velocity measurements for exoplanet detection and chemical abundance analysis of ancient stars.

R=120k spectral resolution

Radio Antenna Array

A 16-element interferometric array operating at 1.4 GHz and 5 GHz, mapping neutral hydrogen distribution across galactic structures and monitoring pulsar timing arrays.

16 dish elements

Solar Monitor Station

Dedicated Hα and calcium-K telescopes track solar activity through the desert atmosphere, contributing to space weather forecasting and coronal mass ejection early warning systems.

24/7 continuous monitoring

Adaptive Optics Bench

A sodium-layer laser guide star system with a 672-actuator deformable mirror, achieving Strehl ratios above 0.8 in K-band — turning atmospheric turbulence from limitation into data.

672 actuator elements
Research Programs

Probing the
Deep Universe

The observatory's research portfolio spans the full electromagnetic spectrum, from the nearest exoplanets to the most distant quasars at the edge of observable time. Our international collaborations bring together over 340 scientists from 22 countries, united by the exceptional clarity of the Saharan sky.

340+
Scientists
22
Countries
1,200+
Publications
Deep field image showing thousands of galaxies
● Active Survey

Saharan Deep Field Survey

A five-year program imaging 12 square degrees of sky to unprecedented depth, targeting galaxy formation in the first billion years of cosmic history. The survey has already identified over 800 candidate galaxies at redshift z > 7, pushing the boundary of the observable universe further back in time.

12.4
sq degrees surveyed
z>7
target redshift
847
candidate galaxies
287
nights allocated
Ongoing

Exoplanet Transit Program

Precision photometric monitoring of 2,000 nearby stars to detect Earth-sized planets in habitable zones. Desert conditions provide the photometric stability needed for transit depth measurements below 50 parts per million.

Confirmed 23 planets
Candidates 67
Collaboration

Pulsar Timing Array

Using millisecond pulsars as cosmic clocks to detect nanohertz gravitational waves — ripples in spacetime from supermassive black hole binaries. The radio array contributes timing precision of 200 nanoseconds per observation.

Pulsars Monitored 38
Timing Precision 200 ns
Active

Interstellar Medium Mapping

Neutral hydrogen surveys across the Saharan sky, tracing the skeleton of our galaxy's spiral arms and identifying star-forming regions invisible to optical telescopes.

Sky Coverage 8,400 sq°
Ongoing

Near-Earth Object Tracking

Automated wide-field survey contributing to the global asteroid warning network. The desert's clear horizon enables observations from twilight to dawn each night.

Objects Catalogued 14,200+
Collaboration

Cosmic Microwave Cross-Calibration

Ground-truth measurements for satellite-based CMB experiments, leveraging the Sahara's exceptionally dry atmosphere at millimeter wavelengths.

Partners ESA, NASA, JAXA
A Night at the Observatory

Your Journey
Through the Stars

From the moment you arrive at dusk to the silence of a predawn observation session, every hour at the Saharan Observatory is designed to deepen your connection with the cosmos.

17:00 — Arrival

Welcome to the Edge of the World

A 4x4 vehicle meets you at Djanet airstrip for the 90-minute drive across the Tassili plateau. As you approach the observatory, the dome emerges from the rocky desert like a spacecraft landed on another planet. The welcome includes traditional Tuareg tea — three glasses, served from a height, each sweeter than the last — and an orientation briefing in the observation lounge.

Desert road approaching the observatory at sunset
19:30 — Twilight Talk

Lecture Under the Fading Sun

As the sun dips below the sandstone cliffs, one of our resident astronomers presents a 45-minute talk on tonight's observation targets. Learn which galaxies are transiting the meridian, which nebulae are at peak visibility, and why the Saharan sky is unique among all observational sites. The talk takes place on the open terrace, where the first stars appear as the astronomer speaks.

Astronomer giving presentation during sunset
21:00 — First Light

Through the Eyepiece

The dome splits open with a hydraulic hum, revealing a sky so dense with stars that constellations become difficult to distinguish. You take your position at the eyepiece as the telescope slews to its first target: the Orion Nebula, 1,344 light-years away. Through the adaptive optics system, Trapezium cluster stars render as needle-sharp points against glowing gas — a view that makes seasoned astronomers fall silent.

Telescope dome open against starry sky
23:30 — Digital Observation

The Control Room

Step into the climate-controlled control room where research astronomers guide the telescope through its nightly program. Monitors display live feeds from the CCD camera — each frame revealing new photons that have traveled for millions or billions of years. You'll operate the imaging interface under supervision, selecting targets from the night's catalog and watching deep-field images accumulate in real time.

Control room screens showing astronomical data
02:00 — Midnight Immersion

Alone Under the Cosmos

The deepest part of the night. After the guided sessions, visitors retreat to individual observation platforms on the northern terrace — reclining beds with heated blankets, designed for naked-eye stargazing. The Milky Way stretches overhead like a river of light, casting faint, silvery shadows on the desert floor. The silence is total, broken only by the whisper of wind across distant dunes. Many visitors report this as the most profoundly peaceful experience of their lives.

Star trails over desert observatory
05:30 — Dawn Return

First Light, Reversed

As astronomical twilight begins, the last targets are observed and the dome closes. Watch the desert transform from deep indigo to burnished gold as the sun returns. Breakfast is served in the dining hall — fresh bread, dates, and strong coffee spiced with cardamom. Before departing, each visitor receives a USB drive containing the images captured through the telescope during their session. The data is real, the photons genuine — your personal record of a night spent in conversation with the universe.

Desert dawn with observatory dome
Panoramic view of the Saharan desert from the observatory
Tassili Plateau, Algeria

Where the Desert
Touches the Sky

Situated at 1,420 meters elevation on the Tassili n'Ajjer plateau in southeastern Algeria, the observatory benefits from some of the driest atmospheric conditions on the planet. The nearest significant light source is the town of Djanet, 95 kilometers to the east.

Site Specifications

Coordinates 24°18′N, 9°32′E
Elevation 1,420 m (4,659 ft)
Nearest Town Djanet (95 km E)
Bortle Scale Class 1 (Excellent)
Avg. Clear Nights 290 / year
Precipitable Water < 5 mm (winter)
Seeing Median 0.68 arcseconds
Nearest Airport Djanet Inedbirene (DJG)
🌡️
8–42°C
Annual Range
💧
< 20mm
Annual Rainfall
🌙
290
Clear Nights/Yr
Satellite view of the Saharan region
Saharan Observatory · 24°18′N 9°32′E
Starry night sky
Now Accepting Bookings

Reserve Your
Night Under the Stars

Public observation nights are available October through April, weather permitting. Each session accommodates a maximum of 12 visitors to ensure an intimate and unhurried experience with the cosmos.

Email
visits@saharanobservatory.org
Phone
+213 29 400 1200
Season
October – April