🌌 Atacama Desert — Night of September 24, 2026

A world-class night is on tap: viewing quality 100, Bortle 2 skies, and a wind that fades to near nothing as the night matures. Here's your hour-by-hour forecast and game plan.

🌡️ Hour-by-Hour Conditions

• 21:00 — The night opens flawless: 0% clouds, −5.3°C, and a gentle 0.7 m/s breeze. Venus may still be clinging to the western horizon — your only chance to grab it.
• 22:00–23:00 — Thin cloud wisps begin to appear (5% → 10%), but they're optically negligible. Temperature slides to −6.3°C; wind eases to 0.3 m/s.
• 00:00 — Peak cloud cover of 15% — still essentially transparent. The mercury bottoms out at −6.8°C and the air is nearly dead calm.
• 01:00 — Clouds relax back to 10%, temperature nudges up a hair to −6.7°C, and wind collapses to just 0.14 m/s — superb atmospheric stability for high-power planetary work.

Bottom line: Every hour is rated "good." The trend is clear early → slightly hazy around midnight → calm and stable after. No precipitation, no fog, visibility a full 16 km all night.

🌕 The Moon — Protagonist and Antagonist

A 92%-illuminated waxing gibbous Moon dominates the sky (rises 17:46, transits 00:03, sets ~05:54). It's effectively a nearly full Moon, so faint extended objects will be washed out. Strategy: target high-surface-brightness objects — globulars and rich open clusters — and leave the faint galaxies for a moonless night.

🪐 Planets

• Venus (−4.47 mag) — An evening apparition; catch it low in the west early, before it sinks below the horizon.
• Saturn (+0.34 mag) — The planetary highlight. It transits at 02:02, reaching its highest, steadiest point just as the wind dies to 0.14 m/s. Expect razor-sharp ring views at high magnification — a textbook night for it.

🎯 Recommended Targets (Moon-Proofed)

M31 and M33 are technically on the list, but with a 92% Moon up, they'll be washed out — save them for a moonless night; they'll be far more rewarding.

🧥 Practical Notes

• Dress for −7°C — this is serious high-desert cold. Thermal layers and gloves are non-negotiable.
• No ISS passes or meteor showers tonight — the show is all planets and deep-sky.
• With wind near zero and Bortle 2 transparency, this is also an ideal night for lucky imaging of Saturn if you have a planetary camera.

Clear skies — and enjoy one of the finest observing sites on Earth at its absolute best! 🔭