Orbitfall — Asteroid Close Approach Tracker
Orbitfall is an asteroid close approach tracker built on NASA near-Earth object data. See which asteroids are passing Earth today and this week, with miss distance in kilometers and lunar distances, relative velocity, estimated size, potentially hazardous status, and the Orbitfall Index — a 0–100 ranking of how notable each approach is, not an impact-risk score.
This week's summary
Filters and sort
This score ranks how notable the asteroid approach is. It is not an impact prediction.
Close approaches
- Diameter
- 29–65 m
- avg 47 m
- Velocity
- 14.3 km/s
- Diameter
- 338–755 m
- avg 546 m
- Velocity
- 18.8 km/s
- Diameter
- 330–738 m
- avg 534 m
- Velocity
- 17.3 km/s
- Diameter
- 307–686 m
- avg 496 m
- Velocity
- 10.8 km/s
- Diameter
- 46–103 m
- avg 75 m
- Velocity
- 19.4 km/s
- Diameter
- 39–88 m
- avg 64 m
- Velocity
- 16.0 km/s
- Diameter
- 25–55 m
- avg 40 m
- Velocity
- 17.2 km/s
- Diameter
- 66–147 m
- avg 107 m
- Velocity
- 10.4 km/s
- Diameter
- 28–62 m
- avg 45 m
- Velocity
- 16.8 km/s
- Diameter
- 27–59 m
- avg 43 m
- Velocity
- 13.8 km/s
- Diameter
- 176–393 m
- avg 284 m
- Velocity
- 1.6 km/s
- Diameter
- 95–213 m
- avg 154 m
- Velocity
- 6.3 km/s
- Diameter
- 17–38 m
- avg 27 m
- Velocity
- 18.7 km/s
- Diameter
- 65–145 m
- avg 105 m
- Velocity
- 7.6 km/s
- Diameter
- 49–110 m
- avg 79 m
- Velocity
- 11.1 km/s
- Diameter
- 60–134 m
- avg 97 m
- Velocity
- 6.9 km/s
- Diameter
- 48–108 m
- avg 78 m
- Velocity
- 8.4 km/s
- Diameter
- 77–171 m
- avg 124 m
- Velocity
- 4.7 km/s
- Diameter
- 64–143 m
- avg 103 m
- Velocity
- 6.4 km/s
- Diameter
- 48–108 m
- avg 78 m
- Velocity
- 8.5 km/s
- Diameter
- 48–108 m
- avg 78 m
- Velocity
- 6.0 km/s
- Diameter
- 12–27 m
- avg 20 m
- Velocity
- 17.0 km/s
- Diameter
- 17–38 m
- avg 27 m
- Velocity
- 13.0 km/s
- Diameter
- 16–36 m
- avg 26 m
- Velocity
- 12.2 km/s
- Diameter
- 33–75 m
- avg 54 m
- Velocity
- 6.9 km/s
- Diameter
- 28–62 m
- avg 45 m
- Velocity
- 8.4 km/s
- Diameter
- 10–22 m
- avg 16 m
- Velocity
- 12.7 km/s
- Diameter
- 6–12 m
- avg 9 m
- Velocity
- 18.2 km/s
- Diameter
- 4–9 m
- avg 7 m
- Velocity
- 11.7 km/s
- Diameter
- 9–20 m
- avg 14 m
- Velocity
- 5.3 km/s
- Diameter
- 8–18 m
- avg 13 m
- Velocity
- 4.5 km/s
What is Orbitfall?
Orbitfall is an asteroid close approach tracker. It reads NASA's near-Earth object data and turns it into a ranked, readable list of the asteroids passing Earth today and over the coming week. Each entry shows the close approach date, the miss distance in kilometers and in lunar distances, the relative velocity in kilometers per second, the estimated diameter range in meters, and whether NASA classifies the object as potentially hazardous. Every measurement comes from NASA; the ranking is ours.
How the Orbitfall Index works
The Orbitfall Index is a 0–100 score that combines four inputs: how close the asteroid passes, how large it is, how fast it is moving, and whether NASA flags it as potentially hazardous. Proximity carries the most weight, followed by size, velocity, and the hazard flag. Scores fall into four bands — Quiet Pass, Notable Pass, Close Watch, and Main Event — so the most notable approach in any window surfaces first. The Orbitfall Index ranks how notable the asteroid approach is. It is not an impact prediction. The full formula is on the methodology page.
What is an asteroid close approach?
A close approach is the point at which an asteroid's orbit brings it to its minimum distance from Earth on a given pass. It is a predicted event, computed by propagating a known orbit forward in time, not a detection of something heading toward us. Dozens of catalogued close approaches occur in a typical week, nearly all of them small objects passing far beyond the Moon's orbit. More detail on asteroid close approaches and what a close approach means.
Why asteroid distances are shown in lunar distances
One lunar distance (LD) is the average Earth–Moon gap, approximately 384,400 km. Raw kilometer figures at solar-system scale are hard to compare, so trackers express miss distance in lunar distances instead: a pass at 2 LD is twice the Earth–Moon gap, while 0.5 LD cuts inside the Moon's orbit. Orbitfall shows both units on every approach. See lunar distance explained.
Is Orbitfall an impact-warning system?
No. Orbitfall is a close approach tracker, not an impact-warning system. It lists scheduled flybys of catalogued objects and ranks how notable each one is. Impact monitoring is handled separately by NASA's Sentry system, which screens catalogued objects for any non-negligible impact probability. Nothing on Orbitfall should be read as an impact probability or a danger rating. Background on the data source is on the NASA asteroid tracker page.
Learn about close approaches
Today's catalogued close approaches, ranked.
What counts as a near-Earth object, and today's list.
What a close approach is and how it's measured.
Where the data comes from and how often it updates.
What NASA's PHA label does and doesn't mean.
1 LD = 384,400 km — the yardstick for flybys.
Why a close approach is a schedule, not a warning.
From first detection to orbit refinement.