EARENDIL-1 Passes
Over Buenos Aires
Predicted pass geometry, viewing conditions, and beam footprint data for Buenos Aires when EARENDIL-1 — the first commercial orbital mirror — launches in mid-2026. From 34.6°S on the Río de la Plata, EARENDIL-1 reaches up to ~69° peak elevation. Buenos Aires sits at a similar latitude to Sydney (33.9°S) and Cape Town (33.9°S), giving essentially identical pass geometry across these cities. Passes rise in the NW and transit toward the NE, opposite to the direction seen from northern-hemisphere observers.
What to Expect in Buenos Aires
What EARENDIL-1 Will Look Like from Buenos Aires
From Buenos Aires, EARENDIL-1 passes will appear as a fast-moving point of light crossing the sky in approximately 3–4 minutes. At peak brightness it will reach magnitude ~−4 — comparable to Venus at maximum and clearly visible from Puerto Madero or anywhere in the Federal Capital. Buenos Aires shares pass geometry with Sydney and Cape Town — the view and viewing times are functionally identical across these three cities separated by vast oceans. The wide Río de la Plata gives excellent seaward viewing for eastward passes.
The mirror is steerable — between targeted commercial passes, Reflect Orbital tilts it away from Earth, making it much dimmer or invisible. During an active commercial pass you'll see a sudden brightening as the beam angle locks onto the target region. The pass ends abruptly when the mirror tilts away again.
Unlike a steady satellite, EARENDIL-1 may show subtle brightness variations as the mirror adjusts its aim. Watch for a brief period of maximum brightness near the peak of the pass when the geometry is optimal — this is when the 5km ground footprint is directly beneath the mirror at closest approach.
Track EARENDIL-1 from Buenos Aires at Launch
OrbitalNodes.ai will provide real-time pass predictions for Buenos Aires from the moment EARENDIL-1's orbital data is published. No app download required — runs entirely in your browser with GPS-accurate directions.
◈ OPEN ORBITALNODES.AISpace Mirror Questions — Buenos Aires
How bright will EARENDIL-1 appear from Buenos Aires?
At peak overhead passes, EARENDIL-1 is designed to reach magnitude ~−4 — comparable to Venus at maximum brightness. It is easily visible from Puerto Madero, Plaza de Mayo, the Obelisco, or any riverside location in the Federal Capital despite Bortle 8 urban light pollution. The Bombonera and El Monumental stadiums both offer good open-sky viewing on non-match nights. Between commercial illumination passes, Reflect Orbital tilts the mirror away from Earth, reducing brightness significantly.
How high will EARENDIL-1 appear from Buenos Aires?
From 34.6°S on the Río de la Plata, EARENDIL-1 can reach ~69° elevation on the best passes. Passes rise in the NW and transit toward the NE, opposite to the direction seen from northern-hemisphere observers. Buenos Aires sits at nearly the same latitude as Sydney (33.9°S) and Cape Town (33.9°S) — peak elevations and pass directions are essentially identical across these three cities despite being on different continents.
When is the best time to see it from Buenos Aires?
March–May (autumn) and September–November (spring) offer Buenos Aires' most reliable viewing — mild temperatures, stable weather, and frequent clear nights. Winter (June–August) is mild with occasional river fog but many clear nights. Summer (December–February) brings humidity and afternoon thunderstorms but warm evenings and long twilight.
Will the beam footprint hit Buenos Aires?
A 5km beam footprint could span from Plaza de Mayo through the Obelisco and onto Puerto Madero in a single pass — covering the historic and financial core of Buenos Aires simultaneously. Alternatively, a beam over San Telmo and La Boca could illuminate the tango-heritage neighbourhoods and La Bombonera (Boca Juniors' stadium) simultaneously. A pass targeting Plaza de Mayo — with the Casa Rosada, the Cabildo, the Metropolitan Cathedral, and the May Pyramid — would carry deep political and cultural resonance as the heart of Argentine democracy. A beam over Palermo could illuminate the city's major parks and the Hipódromo Argentino simultaneously. Whether any specific location falls in the footprint depends on Reflect Orbital's commercial contracts and targeting decisions.
Is EARENDIL-1 visible yet?
No — EARENDIL-1 has not launched yet. Reflect Orbital is targeting a mid-2026 launch. There is currently no space mirror in Earth orbit. OrbitalSolar.ai will update with live pass data from the moment orbital elements are published after launch. Check the mission tracker for current launch status.
Why does the mirror move differently from Buenos Aires than from other cities?
From the Southern Hemisphere at 34.6°S, EARENDIL-1 rises in the NW and transits toward the NE — opposite to the direction seen from northern cities. This is because Buenos Aires is south of the equator, so sun-synchronous satellites approach from the polar direction opposite to northern-hemisphere observers. Buenos Aires shares pass geometry with Sydney (33.9°S) and Cape Town (33.9°S) — the viewing experience is functionally identical across these three widely-separated cities, demonstrating how satellite viewing is determined by latitude rather than longitude.
How does Buenos Aires compare to other Southern Hemisphere cities for EARENDIL-1 viewing?
Buenos Aires sits at 34.6°S on the Río de la Plata — almost identical latitude to Sydney (33.9°S) and Cape Town (33.9°S). Pass geometry, peak elevation, pass direction, and viewing characteristics are essentially identical across these three cities despite being on three different continents separated by vast oceans. The flat Pampas terrain surrounding Buenos Aires provides unobstructed horizons in every direction. The wide Río de la Plata (the world's widest river by some definitions, ~48km at its mouth) gives Buenos Aires observers a completely dark eastern horizon over water — similar to Sydney's Pacific horizon or Cape Town's Atlantic view. This makes Buenos Aires an attractive location for observing Eastward-tracking portions of mirror passes.
What dark-sky locations near Buenos Aires are best for watching the mirror pass?
The Blue Mountains (90 minutes west, Bortle 3–4) give the clearest sky with minimal light dome interference. Ku-ring-gai Chase National Park (45 minutes north) is excellent for clear northern passes. Royal National Park (45 minutes south) has a clear southern horizon. For serious observation, Observatory Hill in the CBD works for the bright mirror itself — at magnitude −4 it needs no dark sky — but the Blue Mountains are far better for seeing the beam footprint effect against a dark sky backdrop.
OrbitalNodes.ai tracks the ISS, Tiangong, Hubble, and all satellites over Buenos Aires in real time — including exact pass times, directions, and brightness predictions.
→ SATELLITES OVER BUENOS AIRES — ORBITALNODES.AI