Skip to main content
SkyTracko
Safe flyby

(2018 HL1)

No riskNASA SPK-ID 3819554
Miss distance
109.7 LD

Far beyond Earth–Moon orbit

≈ 42.2 million km · 110× the Moon's distance

No impact trajectory detected.

Closest approach
Sun, May 3 · 00:00 UTC

42 days ago

Key metrics

Distance
109.7 LD
≈ 42.2 million km
Velocity
21.4 km/s
76935 km/h
Estimated size
44 – 99 m
🏟️ ≈ a football field
Approach time
Sun, May 3 · 00:00 UTC
42 days ago
Absolute magnitude (H)
23.9
Lower = brighter
Status
Passed
Tracked by NASA NeoWs

3D Orbital path

Size comparison

(2018 HL1) is about 71% of Football pitch.

71 m
(2018 HL1)
71 m
Football pitch
100 m
Compare against

Hypothetical impact energy

27.0 MtTNT equivalent

Would devastate a large metropolitan area. Regional effects including earthquakes and firestorms.

Hiroshima equivalents
1.8K
Estimated mass
495.0M kg
Diameter used
71 m
Impact velocity
21.4 km/s
Assumes stony composition (2,600 kg/m³). Actual energy depends on composition, angle, and atmospheric interaction. This is NOT a prediction — this asteroid is not on a collision course.

What this means

This object passed at 110 LD — safely distant and of interest mainly to orbital surveys. No impact trajectory has been detected.

Approach timeline

17 events

Upcoming

  • Thu, Apr 18 · 23:41 UTC
    27.74 LD
    10.7 million km
    12.9 km/s
  • Thu, Apr 29 · 10:55 UTC
    76.99 LD
    29.6 million km
    19.2 km/s
  • Sun, Oct 15 · 22:56 UTC
    30.49 LD
    11.7 million km
    15.2 km/s
  • Wed, Apr 16 · 07:36 UTC
    69.24 LD
    26.6 million km
    11.2 km/s
  • Sun, Apr 24 · 04:19 UTC
    29.33 LD
    11.3 million km
    16.1 km/s
  • Tue, Oct 9 · 10:15 UTC
    57.32 LD
    22 million km
    17.6 km/s
  • Wed, Oct 28 · 23:43 UTC
    61.95 LD
    23.8 million km
    12.3 km/s
  • Thu, Apr 21 · 18:16 UTC
    5.29 LD
    2 million km
    14.2 km/s

Past

  • Sun, May 3 · 00:00 UTC
    109.73 LD
    42.2 million km
    21.4 km/s
  • Sat, Apr 21 · 14:00 UTC
    4.67 LD
    1.8 million km
    14.4 km/s
  • Sat, Oct 29 · 06:44 UTC
    64.44 LD
    24.8 million km
    12.2 km/s
  • Wed, Oct 8 · 11:32 UTC
    59.72 LD
    23 million km
    17.7 km/s
  • Sun, Apr 23 · 04:48 UTC
    15.05 LD
    5.8 million km
    15.2 km/s
  • Sun, Oct 13 · 22:04 UTC
    34.78 LD
    13.4 million km
    15.6 km/s
  • Fri, Apr 28 · 13:08 UTC
    73.37 LD
    28.2 million km
    18.9 km/s
  • Tue, Apr 22 · 02:54 UTC
    11.37 LD
    4.4 million km
    15 km/s
  • Sun, Apr 16 · 11:22 UTC
    71.41 LD
    27.5 million km
    11.1 km/s

How we classify risk

Each object's risk class is computed locally from two NASA NeoWs signals: miss distance (in lunar distances) and estimated diameter. "Potentially hazardous" is NASA's own flag — applied when an object's orbit brings it within 0.05 AU of Earth and it's at least ~140 m across. That flag indicates monitoring interest, not an impact prediction.

No risk

Passes at a comfortable distance — routine flyby.

Watch

Close-but-comfortable. Interesting enough to highlight.

Notable

Inside 10 lunar distances — actively tracked.

Significant

Large object passing unusually close — refined each observation.

Other tracked objects

Share