Asteroid Apophis to pass Earth in 2029, visible to naked eye

The night sky over Europe, Africa, and western Asia is set to host a rare celestial event on Friday, April 13, 2029. At 21:46 GMT, the asteroid Apophis 99942 will reach its closest approach to Earth, passing through the Moon's orbit at a speed of 45,000 kilometers per hour.

Scale of the cosmic visitor

Apophis weighs fifty million tons and has a diameter of 330 meters, roughly equivalent to three football pitches combined. If this rocky body were to collide with our planet, it would release energy comparable to sixty-five thousand Hiroshima-sized nuclear bombs. Such an impact could erase a small nation from the map or trigger devastating tsunami waves.

The name Apophis references the ancient Egyptian deity of darkness, destruction, and chaos. However, precise astronomical calculations indicate a 99.7 percent probability that the asteroid will pass safely between thirty thousand and thirty-three thousand kilometers away. While this distance seems vast by terrestrial standards, it is closer than many geostationary satellites, representing a mere "flea jump" in cosmic terms.

Visibility without telescopes

Following dusk on that date, observers will be able to track Apophis as a moving point of light resembling a medium-sized star. It will drift slowly across the constellation Cancer for several hours. This marks the first time in human history that an asteroid will be clearly visible to the naked eye, offering direct visual testimony to the immense forces governing our solar system.

After dazzling viewers with its brightness, the object will gradually fade into the infinite blackness of space, leaving behind deep existential questions about humanity's place in the universe.

The gravitational keyhole risk

Scientists identify a specific danger zone known as a "gravitational keyhole." This invisible trap is a narrow strip of space only one kilometer wide. If Apophis passes exactly 30,404.5 kilometers from Earth during its 2029 flyby, our planet's gravity will slightly alter its trajectory.

This minor change would position Earth directly in the path of the asteroid seven years later, on April 13, 2036. The probability of this scenario occurring is estimated at one in forty-five thousand. Michael De Kay from Carnegie Mellon University notes the dilemma: some argue that remote risks do not warrant attention, while others believe any chance of such a catastrophic event is unacceptable.

Other potential threats

Apophis is not the only object under surveillance. Space agencies are monitoring other celestial bodies that pose long-term risks. Asteroid Bennu is projected to pass near Earth in 2182 with a collision probability of 0.04 percent.

• Asteroid 29075 (1950 DA) approaches in 2880 with a 0.0029 percent impact chance.
• Asteroid 2023 TL4 may pass close in 2119 with a 0.00055 percent probability.
• Asteroid 2007 FT3 had a one-in-ten-million chance of impact on dates including 2024.

The 2029 encounter serves as a reminder of the unforgiving laws of the cosmos. It highlights both human fragility against massive cosmic forces and the scientific capability to predict and observe these phenomena.