Key facts
- A mini planetary parade featuring Mercury, Venus, and Jupiter is visible across the US on June 12.
- The planets will align low above the western horizon shortly after sunset.
- Venus and Jupiter will be the brightest, with Mercury appearing lower and closer to the horizon.
- The event offers a rare naked-eye astronomy viewing opportunity.
- Optimal viewing begins 30 to 60 minutes after local sunset, requiring a clear view of the western horizon.
- Binoculars may assist in locating the fainter Mercury.
Skywatchers across the United States have the opportunity to witness a mini planetary parade on June 12, featuring Mercury, Venus, and Jupiter. The celestial trio will align low above the western horizon shortly after sunset, presenting a beautiful naked-eye astronomy event.
Venus and Jupiter, already prominent in the early June sky, will be the brightest objects in this alignment. Mercury will join them, appearing lower and closer to the horizon, making it the most challenging planet to spot. Astronomers refer to such groupings as "planet parades" when multiple planets appear close together from Earth's perspective, despite being millions of miles apart in space.
The optimal viewing window begins approximately 30 to 60 minutes after local sunset. Observers are advised to look toward the western to west-northwestern horizon. Due to Mercury's proximity to the horizon, it may disappear from view quickly, so starting observations as the sky darkens is recommended.
Ideal viewing locations will have an unobstructed view of the western horizon, free from trees, buildings, or mountains. Areas with low light pollution, such as rural locations, beaches, or open fields, will offer the best conditions. While Venus and Jupiter are visible to the naked eye, binoculars can aid in locating Mercury. Clear skies are essential, and checking the weather forecast is advised.