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Jupiter aligns with crescent moon in the night sky on May 20

Lua, calendário lunar
Photo: Lua, calendário lunar - TobyRyan/ Shutterstock.com

The crescent moon will align with Júpiter on the evening of May 20th. The phenomenon will be visible from sunset, when the two stars will occupy the same sector of the western sky. The pair will remain observable for a few hours before disappearing below the spring horizon.

Alinhamento visible from west to horizon

Durante At sunset on May 20, the moon will appear to align with the bright stars Castor and Pólux, located in the constellation Gêmeos. Júpiter will shine less than 10 degrees below and to the right of the moon, a distance roughly equivalent to the width of a clenched fist when the arm is extended. The alignment will occur in the western sector of the sky, offering ideal conditions for naked-eye observation.

Vênus will appear near the horizon, to the right of Júpiter. The rocky planet will act as a constant “evening star” in the night sky for months to come, marking the progression of the planetary conjunction. The presence of three celestial bodies visible simultaneously makes the event particularly relevant for amateur observers and astronomers.

Detalhes technicians for telescopic observation

Telescópios openings of 10 centimeters or larger reveal the slow progression of Vênus phases in its pale disc. The optical instrument provides details not visible to the naked eye, allowing us to follow the evolution of the planet’s lighting over the weeks. Observadores must wait until the sun is well below the horizon before pointing the equipment to the west, avoiding damage to the eyes and the telescope.

The quality of the observation depends on local atmospheric conditions. Cloudy Céus can impair visualization, particularly of planetary details. Clear Noites with little cloud cover provides the best opportunities to follow the lunar alignment and luminosity of Júpiter in high resolution.

moon and jupiter
moon and jupiter – Nazarii_Neshcherenskyi/Shutterstock.com

Duração and best viewing time

The alignment will be best observed in the minutes immediately after sunset. Neste period, the crescent moon and Júpiter will be at the height of their visibility, with adequate contrast against the twilight sky. The pair will remain above the horizon for approximately two to three hours, depending on the observer’s latitude and western horizon conditions.

Observadores located in different regions of Brasil will experience slight variations in the exact times of sunset and the altitude of the stars. Cidades with clear horizon offer considerable advantages for those who want to capture images or simply document the event. Lineup photography with digital cameras is viable, especially with tripods and long exposures.

Contexto astronomical event

Alinhamentos between celestial bodies occur regularly due to the predictable orbital movements of planets and natural satellites. Júpiter, the largest planet in the solar system, remains visible for extended periods when its orbits position it toward Terra. The moon, in its waxing phases, offers visual spectacles when it approaches more luminous bodies.

The May 20th event is part of the series of visible conjunctions that occur throughout the year. Astrônomos and astrophotographers leverage these alignments for educational and artistic purposes, sharing observations across networks of astronomy enthusiasts.

  • Melhor time: minutes after sunset
  • Setor from the sky: west
  • Useful Instrumentos: 10 cm or larger telescope
  • Corpos involved: crescent moon, Júpiter, Vênus, Castor and Pólux
  • Observable Duração: two to three hours