LEO Express 2 beside LEO Express 3
A satellite of Impulse Space Propulsion moved up beside a satellite of Impulse Space Propulsion, 3.4 km away at the nearest, and left after 16 days.
Unreported: no public report has named these two in the 90 days since the detector found them beside each other.
Left · the one that moved opened the distance on August 7, 2026
- Nearest
- 3.4 km
- Jul 22 · 8:00 PM UTC
- Beside for
- 16 days
- Jul 22, 2:00 PM to Aug 7, 5:02 AM UTC
- Took to come beside
- 1 day 8 h
- same plane Jul 21, same height Jul 21
- Orbit
- LEO
- low Earth orbit
- Last move
- LEO Express 2
- Jul 23 · 8:00 PM UTC
The one that moved
LEO Express 2
Impulse Space Propulsion, United States
62673 · 2025-009BS · launched Jan 14, 2025
The one it came up to
LEO Express 3
Impulse Space Propulsion, United States
66687 · 2025-276X · launched Nov 28, 2025
Whether Impulse Space Propulsion or Impulse Space Propulsion has said what this rendezvous was is not recorded yet. What others said is below; this page draws no conclusion.
The stages
Each step is one of Space-Track’s element sets, run through SGP4 and set against the other’s. A stage is raised by one set and confirmed when a later one agrees.
published 10:26 AM UTC
Same plane seen
LEO Express 2’s orbit was found in LEO Express 3’s plane, 0.022° off, and 2.03 km lower.
Δa −2.03 km · θ 0.022°
published 10:26 AM UTC
Same height seen
LEO Express 2’s orbit had come to within 2.03 km of LEO Express 3’s height.
172.98 km · Δa −2.03 km · θ 0.022°
published 6:27 PM UTC
Beside raised
A set placed LEO Express 2 beside LEO Express 3. One set raises it; a later one must agree.
11.06 km · 69.4 km a day later · Δa −0.33 km · θ 0.014°
published 6:27 PM UTC
Move raised
A set showed LEO Express 2 had moved, by 0.9 m/s.
11.06 km · 69.4 km a day later · Δa −0.33 km · θ 0.014°
published Jul 23, 2:45 AM UTC
Beside confirmed
A later set agreed: LEO Express 2 stayed beside LEO Express 3.
8.31 km · 75.2 km a day later · Δa −0.30 km · θ 0.015°
published Jul 23, 2:45 AM UTC
Nearest raised
The least distance read on the pair fell to this.
3.37 km · 54.2 km a day later · Δa −0.56 km · θ 0.016°
published 10:46 PM UTC
Move raised
A set showed LEO Express 2 had moved, by 0.3 m/s.
5.00 km · 53.6 km a day later · Δa +0.15 km · θ 0.009°
published 12:46 PM UTC
Left raised
A set saw LEO Express 2 moving away from LEO Express 3. One set raises it; a later one must agree.
202.61 km · 237.2 km a day later · Δa +0.25 km · θ 0.001°
published 7:36 PM UTC
Left confirmed
A later set agreed: LEO Express 2 had left LEO Express 3.
218.21 km · 253.6 km a day later · Δa +0.26 km · θ 0.001°
The moves
Each move is a change the detector read between two of an object’s element sets, beyond what drag and the Earth’s shape do: the speed change it implies, the change of height and the change of the orbit’s plane.
Reported elsewhere
No report elsewhere names this rendezvous yet.
Every verdict as numbers
| Stage | State | Set epoch (UTC) | Published (UTC) | Distance | A day later | Δa | θ | Exclusion |
|---|---|---|---|---|---|---|---|---|
| Same plane | seen | 2026-07-21 06:00:02 | 2026-07-21 10:26:54 | −2.03 km | 0.0221° | |||
| Same height | seen | 2026-07-21 06:00:02 | 2026-07-21 10:26:54 | 172.98 km | −2.03 km | 0.0221° | ||
| Beside | raised | 2026-07-22 14:00:03 | 2026-07-22 18:27:12 | 11.06 km | 69.42 km | −0.33 km | 0.0141° | |
| Move | raised | 2026-07-22 14:00:03 | 2026-07-22 18:27:12 | 11.06 km | 69.42 km | −0.33 km | 0.0141° | |
| Beside | confirmed | 2026-07-22 15:03:54 | 2026-07-23 02:45:01 | 8.31 km | 75.15 km | −0.30 km | 0.0148° | |
| Nearest | raised | 2026-07-22 20:00:01 | 2026-07-23 02:45:01 | 3.37 km | 54.23 km | −0.56 km | 0.0158° | |
| Move | raised | 2026-07-23 20:00:01 | 2026-07-23 22:46:26 | 5.00 km | 53.63 km | +0.15 km | 0.0094° | |
| Left | raised | 2026-08-07 05:02:54 | 2026-08-07 12:46:56 | 202.61 km | 237.16 km | +0.25 km | 0.0007° | |
| Left | confirmed | 2026-08-07 16:05:38 | 2026-08-07 19:36:54 | 218.21 km | 253.60 km | +0.26 km | 0.0005° |
Δa is the semi-major axis of the one that moved less the other’s; θ is the angle between the two orbits’ planes. A day later is where the set puts the two 24 hours on, with no further manoeuvre. An exclusion tag on any of this rendezvous’s verdicts would keep it off the list; the pair’s other rendezvous are judged on their own.