SkyTracko
Safe flyby

(2005 YO128)

No riskNASA SPK-ID 3309832
Miss distance
173 LD

Far beyond Earth–Moon orbit

≈ 66.5 million km · 173× the Moon's distance

No impact trajectory detected.

Closest approach
Wed, Apr 22 · 00:00 UTC

7 days ago

Key metrics

Distance
173 LD
≈ 66.5 million km
Velocity
13.7 km/s
49367 km/h
Estimated size
32 – 71 m
🏟️ ≈ a football field
Approach time
Wed, Apr 22 · 00:00 UTC
7 days ago
Absolute magnitude (H)
24.6
Lower = brighter
Status
Passed
Tracked by NASA NeoWs

3D Orbital path

Size comparison

(2005 YO128) is about 157% of 10-story building.

52 m
(2005 YO128)
52 m
10-story building
33 m
Compare against

Hypothetical impact energy

4.2 MtTNT equivalent

Would cause significant local destruction. Comparable to a large nuclear weapon.

Hiroshima equivalents
281
Estimated mass
188.2M kg
Diameter used
52 m
Impact velocity
13.7 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 173 LD — safely distant and of interest mainly to orbital surveys. No impact trajectory has been detected.

Approach timeline

17 events

Upcoming

  • Wed, Dec 10 · 07:27 UTC
    71.05 LD
    27.3 million km
    9.3 km/s
  • Thu, Dec 28 · 10:20 UTC
    35.94 LD
    13.8 million km
    9.3 km/s
  • Tue, Jan 5 · 03:02 UTC
    10.87 LD
    4.2 million km
    10.9 km/s
  • Fri, Jan 4 · 15:02 UTC
    67.7 LD
    26 million km
    14.7 km/s
  • Thu, Jan 6 · 01:19 UTC
    25.77 LD
    9.9 million km
    11.8 km/s
  • Mon, Dec 19 · 02:23 UTC
    56.51 LD
    21.7 million km
    9.2 km/s
  • Fri, Jan 2 · 21:21 UTC
    11.85 LD
    4.6 million km
    10 km/s
  • Fri, Jan 6 · 09:05 UTC
    40.02 LD
    15.4 million km
    12.7 km/s

Past

  • Wed, Apr 22 · 00:00 UTC
    172.95 LD
    66.5 million km
    13.7 km/s
  • Mon, Jan 5 · 06:51 UTC
    47.39 LD
    18.2 million km
    13.3 km/s
  • Tue, Jan 3 · 22:52 UTC
    6.54 LD
    2.5 million km
    10.3 km/s
  • Sun, Dec 22 · 01:23 UTC
    51.43 LD
    19.8 million km
    9.2 km/s
  • Sun, Jan 6 · 04:08 UTC
    32.46 LD
    12.5 million km
    12.3 km/s
  • Fri, Dec 31 · 18:30 UTC
    21.82 LD
    8.4 million km
    9.6 km/s
  • Thu, Dec 13 · 15:39 UTC
    65.7 LD
    25.3 million km
    9.3 km/s
  • Tue, Jan 5 · 01:04 UTC
    59.04 LD
    22.7 million km
    14.1 km/s
  • Thu, Jan 4 · 10:51 UTC
    5.41 LD
    2.1 million km
    10.4 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

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