International Asteroid Day2026 · Date · History · Messages · Quotes
A/RES/71/90
About International Asteroid Day
International Asteroid Day is observed on 30 June to raise awareness of asteroid-impact hazards and international work related to near-Earth objects.
The observance is educational and preparedness-oriented. It should not be used to amplify unsupported impact predictions, sensational claims or unofficial emergency instructions.
Why International Asteroid Day matters
Near-Earth-object monitoring combines astronomy, observation networks, orbit calculation, risk communication and international coordination. Public understanding benefits from distinguishing a detected object from a credible impact threat.
Current risk assessments can change as observations improve, so live hazard claims should come from competent space agencies and recognized monitoring systems rather than evergreen observance copy.
History of International Asteroid Day
In December 2016, the General Assembly adopted resolution A/RES/71/90 declaring 30 June International Asteroid Day.
The United Nations states that 30 June was chosen to mark the anniversary of the Tunguska impact over Siberia on 30 June 1908.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
United Nations General Assembly
UN General Assembly resolution A/RES/71/90
First documented observance
United Nations material identifies 30 June 2017 as the first International Asteroid Day following the General Assembly designation.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
4 fields not established in reviewed sources
How to Observe International Asteroid Day
Explore how astronomers detect and track near-Earth objects using a recognized space-agency resource.
Learn what changes when additional observations refine an asteroid’s orbit.
Compare planetary defence with human spaceflight so the two topics are not treated as the same field.
Use reputable observatories, space agencies or UN space resources when discussing current risk.
Avoid sharing alarming impact claims without a current authoritative source.
International Asteroid Day Facts
International Asteroid Day is observed on 30 June.
The UN General Assembly established it through A/RES/71/90 in 2016.
30 June marks the anniversary of the 1908 Tunguska impact.
The day focuses on asteroid-impact awareness and near-Earth-object preparedness.
Current risk assessments are time-sensitive and should not be frozen into evergreen copy.
International Asteroid Day Messages
May International Asteroid Day spark fresh ideas, thoughtful conversation and a little more curiosity about the subject behind the day.
International Asteroid Day is a good excuse to slow down, explore the topic and enjoy the people, stories or traditions connected with it.
Wishing everyone marking International Asteroid Day a day filled with curiosity, creativity and meaningful discovery.
Happy International Asteroid Day! May International Asteroid Day invite fresh curiosity about the traditions, ideas and people connected with this occasion.
Celebrate International Asteroid Day by learning something new, sharing what you enjoy and inviting someone else into the experience.
International Asteroid Day Quotes
“to raise public awareness about the asteroid impact hazard.”
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
United Nations Digital Library — A/RES/71/90 (opens in a new tab)
United Nations — International Asteroid Day (opens in a new tab)
United Nations — List of International Days and Weeks (opens in a new tab)
United Nations — Observances: who chooses them and how (opens in a new tab)
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is International Asteroid Day?
30 June The documented recurrence rule is: 30 June.
Does International Asteroid Day fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is International Asteroid Day an official public holiday?
The reviewed sources verify it within this scope: United Nations / international observance. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes International Asteroid Day?
The reviewed sources identify United Nations General Assembly as the proclaiming or establishing body.
Is International Asteroid Day international or country-specific?
The documented scope is international or global: United Nations / international observance. That does not mean every country treats the date as a public holiday or observes it in the same way.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-05.
Why is International Asteroid Day on 30 June?
The United Nations chose 30 June to mark the anniversary of the Tunguska impact over Siberia on 30 June 1908.
Does Asteroid Day mean a specific asteroid is expected to hit Earth?
No. The observance is about awareness and preparedness; any current impact-risk claim must be checked against competent, up-to-date monitoring sources.
Which resolution established the day?
The UN General Assembly established International Asteroid Day through resolution A/RES/71/90 in 2016.
How this differs from closely related observances
These distinctions use the cited evidence to clarify scope without treating related observances as identical.
Is International Asteroid Day the same as International Day of Human Space Flight?
International Asteroid Day on 30 June focuses on asteroid-impact hazards, near-Earth objects and planetary-defence awareness. The International Day of Human Space Flight on 12 April commemorates the beginning of human spaceflight and the use of outer space for peaceful purposes.
Open International Day of Human Space Flight →Distinction sources
Other observances on June 30
These observances are also listed on June 30, 2027.
International Day of Parliamentarism
A/RES/72/278
National Day of Joy
Comfort Keepers states that it created National Day of Joy in 2019, held the first annual observance on June 26, 2019, and continues to observe it on the last Wednesday in June.
Philippine-Spanish Friendship Day
Republic Act No. 9187 declares June 30 each year Philippine-Spanish Friendship Day, a national special working holiday and a special non-working holiday in Aurora Province; current NCCA/NHC…
Social Media Day
Michigan government states that Mashable launched Social Media Day in June 2010 and documents 30 June as the annual date, including a 2026 Michigan proclamation.