Near-Earth Object
523817 (2009 TK
NASA ID: 20523817
523817 (2009 TK will pass Earth on 24 September 2027 at a distance of 99.84 lunar distances (LD) - about 38,377,071 km - travelling at 47,081 km/h. Its estimated diameter is between 90 and 202 metres, roughly the size of The Shard in London (310 m tall). NASA does not classify it as potentially hazardous.
Close Approach Date
24 September 2027
In 365 days
Miss Distance
99.84 LD
38,377,071 km
100 times the Moon's distance from Earth
Velocity
47,081 km/h
1.7 times the orbital speed of the International Space Station
Est. Diameter
90–202 m
Absolute Magnitude
H = 22.34
The brightness measure astronomers use to estimate size
Hazard Classification
Not Hazardous
The real orbit in 3D
The actual path of 523817 (2009 TK 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 523817 (2009 TK to Earth between 1900 and 2018, 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 →
