A rare astronomical event is taking place as asteroid 887 Alinda, a colossal 4.2-kilometer-wide space rock, makes its closest approach to Earth in over 100 years. Comparable in size to Manhattan Island, this near-Earth asteroid offers a unique observation opportunity for astronomers and skywatchers alike.
Originally discovered by German astronomer Max Wolf at Heidelberg Observatory on January 3, 1918, 887 Alinda is a standout among near-Earth objects. Unlike the majority, which are considerably smaller, this asteroid ranks among the largest to approach Earth. Its current trajectory places it in the top five largest asteroids projected to come within 15 million kilometers of our planet between now and the year 2200.
Today marks its nearest approach in a century, reaching a distance of 0.08220 astronomical units (AU) from Earth. Given that 1 AU equals approximately 150 million kilometers—the standard measure of the Earth-Sun distance—this means the asteroid is currently about 12.3 million kilometers away. That’s roughly 32 times the Moon’s average distance from our planet.
Although it will pass relatively close to Earth, there is no risk of impact. Comprehensive orbital analyses confirm that 887 Alinda is not classified as a potentially hazardous asteroid. However, its elongated orbit around the Sun periodically brings it near our planet, making this encounter a rare and fascinating event.
For the next 10 days, skywatchers can spot the asteroid with binoculars or a small telescope. Those in the Northern Hemisphere should look toward the Orion and Gemini constellations for the best viewing experience.
If direct observation isn’t possible, the Virtual Telescope Project is hosting live-streamed events. The first will air on January 8, 2025, at 20:30 UTC, followed by another on January 12, 2025, at 17:30 UTC. The latter will showcase the asteroid at peak brightness, providing optimal visibility.
Such close encounters with asteroids of this magnitude happen only once every decade. After this flyby, 887 Alinda won’t return for another near-Earth approach until January 25, 2087, when it will pass at a distance of 0.16633 AU.
For astronomy enthusiasts, this event is a rare chance to witness one of the largest near-Earth objects passing through our night sky. Be sure to take a moment to look up and appreciate this extraordinary celestial phenomenon.
