A newly discovered asteroid designated 2017 SQ2 flew past Earth at a very close distance of 0.53 LD (~203 520 km / 126 461 miles) on September 14, 2017. The object flew past us 4 days before it was discovered.
Asteroid 2017 SQ2 belongs to the Apollo group of asteroids. Its estimated diameter is between 19 and 41 m (62 and 134 feet). 2017 SQ2 flew past Earth at 16:19 UTC (± 6 min) on September 14 at a speed (relative to the Earth) of 10.06 km/s.
Asteroid 2017 SQ2 was discovered at Catalina Sky Survey on September 18, 2017. Four days after it flew past our planet.
This is the 29th known near-Earth asteroid to flyby Earth within 1 LD since the start of the year, according to data available at CNEOS on September 20, 2017. You can find them in our Near-Earth Objects category. It might also be interesting to compare what you find there with our reports of all notable bright fireballs around the globe. You can find that in our Meteor Activity category.
The closest one (2017 GM) flew past Earth at just 0.04 LD (~15 360 / 9 544 miles) on April 4. Its estimated diameter is between 2.8 and 6.3 m (9 and 20 feet).
The largest so far was 2017 QP1 with an estimated diameter of 37 to 83 m (121 to 272 feet). It flew past Earth at 0.16 LD (~61 440 km / 38 177 miles) on August 14.
As of September 16, there are 16 675 known near-Earth objects. Of them, 16 569 are near-Earth asteroids.
Featured image: The green line indicates the object's apparent motion relative to the Earth, and the bright green marks are the object's location at approximately one-hour intervals. The Moon's orbit is gray. The blue arrow points in the direction of Earth's motion and the yellow arrow points toward the Sun. Credit: Minor Planet Center