In the western sky after sunset, two bright celestial objects catching the eye are not stars but planets: Jupiter and Venus. These planets, though appearing close together, are actually approximately 670 million kilometers apart. Venus has been steadily rising in the sky since early May, while Jupiter has been descending towards the west.
For those interested, the planets can be spotted in the west after sunset, with Venus shining brighter and positioned lower on the horizon. This cosmic rendezvous serves as a reminder that space is dynamic, with the two planets providing an easily visible demonstration of the solar system’s objects in motion.
As the days progress, Venus will surpass Jupiter in the sky, with the closest encounter between them occurring on June 8 when they will be just over a degree apart. The following day, June 9, will see them even closer, showcasing what astronomers technically term as appulses but commonly refer to as conjunctions.
Enthusiasts need not wait for the closest approach to witness this planetary dance. Instead, they can track the planets over the upcoming days as they traverse the sky, requiring only a clear view of the western horizon. Additionally, Mercury will also join the spectacle on June 8 and 9 as it emerges higher above the glare of the sun.
While planetary conjunctions occur annually, some are more proximate than others, with visibility varying. Jupiter and Venus align approximately every three years, although their evening meetings are not guaranteed. As a bonus activity preceding the conjunction, observers can enjoy watching Jupiter’s moons, including Io, Callisto, Europa, and Ganymede, change positions each night due to their rapid orbits around the giant planet.
For assistance in identifying these celestial phenomena, tools like Sky & Telescope’s Jupiter Moons or night sky apps can provide helpful guidance.