updates
How SpaceX said Starlink avoids long-lived debris
On February 22, 2022, SpaceX described low-orbit operations, a 99 percent satellite reliability claim, and 3,300 collision-avoidance maneuvers in six months.
Topics: space-civilization
This page is an original Muskularity summary. It does not republish SpaceX’s full post. Figures are the company’s statements on the cited date unless another primary link is named.
Summary
SpaceX published its debris rules for Starlink as of early 2022. Satellites are built to maneuver, flown below 600 kilometers so a dead satellite decays, and checked out in a lower orbit before they climb. The company said it could build up to 45 satellites a week and had launched as many as 240 in a month. After more than 2,000 satellites, reliability was put at higher than 99 percent, with 1 percent failing after orbit raise. Deorbit from the operating altitude was said to take about four weeks, with propellant reserved for it, and more than 200 satellites had been deorbited this way.
Deployment altitude is under 350 kilometers; the electric thruster then raises the satellite to about 550 kilometers. The February 3, 2022 storm is cited here as evidence: increased drag deorbited 38 satellites early. Below 600 kilometers, SpaceX said a non-maneuverable object of the mass-to-area ratio it graphed would decay in about five to six years, against an FCC and international 25-year standard it called outdated. Constellations above 1,000 kilometers are the contrast case, because a failure there can take centuries to decay.
Avoidance: if the U.S. Space Force’s 18th Space Control Squadron screening shows a collision probability above 1 in 100,000, ten times stricter than a 1-in-10,000 industry figure SpaceX cited, the satellite maneuvers. From June through November 2021 the chart in the post totals 3,300 maneuvers. Satellites can also turn edge-on, which SpaceX said cuts probability another four to ten times. Operators can reach SpaceX through space-track.org. The post urges other operators to share ephemerides. A Wikipedia link in the original for shield vocabulary is not used as a source here.
Key facts
| Fact | Label |
|---|---|
| Operating altitude about 550 km; deployment under 350 km; policy ceiling below 600 km | Company operating description |
| Reliability stated above 99 percent after more than 2,000 satellites | Company reliability claim |
| 3,300 avoidance maneuvers, June through November 2021 | Company operations count |
| Maneuver threshold 1 in 100,000 | Company policy |
| 38 satellites lost early after the February 3, 2022 storm | Company cross-reference to that event |
Why it matters
Starlink growth is also a debris argument. This post is the company’s own standard, including a maneuver bar it says is tighter than the industry figure. It is not an independent audit of conjunctions. The storm loss is the same event as the February 8 note, with a count of 38 here and “up to 40” there.
On this site
Sources
- SpaceX update, February 22, 2022 — Grade A, company post
- Space-Track, the catalog SpaceX pointed operators to — Grade A, space-object catalog
Return to the updates timeline.