Near-Earth Object
2021 MK1
NASA ID: 54161861
2021 MK1 will pass Earth on 29 June 2026 at a distance of 154.35 lunar distances (LD) - about 59,332,661 km - travelling at 70,842 km/h. Its estimated diameter is between 145 and 324 metres, roughly the size of The Shard in London (310 m tall). NASA classifies it as a potentially hazardous asteroid (PHA) - a designation based on size and orbital proximity, not on any predicted impact.
Close Approach Date
29 June 2026
In 5 days
Miss Distance
154.35 LD
59,332,661 km
154 times the Moon's distance from Earth
Velocity
70,842 km/h
2.6 times the orbital speed of the International Space Station
Est. Diameter
145–324 m
Absolute Magnitude
H = 21.32
The brightness measure astronomers use to estimate size
Hazard Classification
Potentially Hazardous
A watch-list label based on size and orbit, not a predicted impact
The real orbit in 3D
The actual path of 2021 MK1 around the Sun, computed from JPL orbital elements. Drag to rotate, scroll to zoom, and use the time controls to run the orbit forwards or back.
Every recorded pass
Each dot is one close approach of 2021 MK1 to Earth between 1923 and 2077, from JPL's records. Lower means closer: a dot under the dashed line passed nearer than the Moon. The orange dot is the approach on this page.
Size Comparison
Reading the Numbers
- A lunar distance (LD) is the average gap between Earth and the Moon, about 384,400 km. It is the standard yardstick for close approaches. Read more →
- Diameter estimates come from brightness. A dark surface reflects less light than a bright one, so the true size can sit anywhere in the quoted range. Read more →
- Potentially hazardous is a watch-list label based on size and orbital proximity. It does not mean an impact is expected. Read more →
