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How Many Days Until Asteroid Day?

Live astronomical countdown and cosmic facts for the next Global Awareness.

315 Days Left
Target Date: Wednesday, June 30, 2027
Last verified: Wednesday, August 19, 2026

⏱️ Time Breakdown

  • Total Months span: ~10.3 months
  • Total Weeks factor: 45 weeks
  • Business Days Left: 225 Days
  • Target Day: Wednesday

📖 About Asteroid Day

Asteroid Day falls on June 30, the anniversary of the 1908 Tunguska event, when an asteroid or comet fragment exploded in the atmosphere over a remote part of Siberia, flattening roughly 2,000 square kilometers of forest, the largest impact event in recorded history. The observance was established in 2015, backed by the B612 Foundation, an organization focused on planetary defense, with support from scientists and former astronauts. The United Nations General Assembly formally recognized the day in 2016.

How It's Observed

Events focus on public education about asteroid impact risk and planetary defense efforts, talks from astronomers and space agencies, and updates on real tracking programs that monitor near Earth objects for potential impact risk.

Related

Carl Sagan Day, Space Exploration Day, Earth at Aphelion

Frequently Asked Questions

When is Asteroid Day in 2027? −
Wednesday, June 30, 2027.
Why is Asteroid Day on June 30? +
It marks the anniversary of the 1908 Tunguska event, when an asteroid or comet fragment exploded over Siberia, flattening about 2,000 square kilometers of forest, the largest impact event in recorded history.
Who established Asteroid Day? +
The B612 Foundation, a planetary defense organization, established it in 2015. The United Nations formally recognized the day in 2016.
Is Asteroid Day a public holiday? +
No, it's an awareness observance focused on planetary defense education, not a day off work or school.