Near-Earth Object
136849 (1998 CS1
NASA ID: 20136849
136849 (1998 CS1 will pass Earth on 19 July 2027 at a distance of 29.8 lunar distances (LD) - about 11,453,560 km - travelling at 56,886 km/h. Its estimated diameter is between 767 and 1,714 metres, roughly the size of Ben Nevis (1,345 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
19 July 2027
In 295 days
Miss Distance
29.8 LD
11,453,560 km
30 times the Moon's distance from Earth
Velocity
56,886 km/h
2.1 times the orbital speed of the International Space Station
Est. Diameter
767–1,714 m
Absolute Magnitude
H = 17.7
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 136849 (1998 CS1 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 136849 (1998 CS1 to Earth between 1905 and 2080, 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 →
