Defiant Satellite Bus
Data current as of 2026-07-20.
The Defiant bus accounts for 18 cataloged objects, of which 14 are in orbit and 12 are active. 4 have reentered. Most are built by UTIAS. The largest operator on this bus is HawkEye 360. The first launched in 2021, the most recent in 2025.
14
In orbit
12
Active
18
Total launched
4
Reentered
Defiant launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged Defiant satellites.
| Manufacturer | UTIAS |
|---|---|
| Purpose | RF spectrum monitoring, SIGINT, Traffic monitoring |
| Launch mass | 31 kg |
| Dry mass | 30 kg |
| Length | 0.5 m |
| Diameter | 0.4 m |
| Span | 1 m |
| Shape | Box + 2 pan |
| Power | Solar cells, batteries |
| Propulsion | FEES or water thrusters (#2-6); water thrusters (#7-...) |
| Design life | 3 years |
| Equipment | AIS-receiver, SmallCAT, VDES, Laser Reflector |
| Typical orbit | 94 min period, 98° inclination |
Top operators
Top countries
US 12 CA 4 N 2
Defiant satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| NORSAT-4 NORSAT-4 | 62705 | 2025-009DA | NSC | Jan 14, 2025 | 96 min, 97.8° | Active | ◉ |
| Jay D2 Jay D2 | 62643 | 2025-009AL | DRDC/UTIAS | Jan 14, 2025 | 89 min, 97.4° | Inactive | ◉ |
| Jay D1 Jay D1 | 62642 | 2025-009AK | DRDC/UTIAS | Jan 14, 2025 | 94 min, 97.4° | Active | ◉ |
| Jay C Jay C | 62641 | 2025-009AJ | DRDC/UTIAS | Jan 14, 2025 | 94 min, 97.4° | Active | ◉ |
| LEO 3 Telesat LEO 3 | 57392 | 2023-100G | TCANL | Jul 18, 2023 | 105 min, 99.6° | Inactive | ◉ |
| NORSAT-TD NORSAT-TD | 56194 | 2023-054S | NSC | Apr 15, 2023 | 88 min, 97.3° | Reentered | ◉ |
| HAWK-5A Hawk 5A | 52757 | 2022-057AB | HE360 | May 25, 2022 | 93 min, 97.7° | Active | ◉ |
| HAWK-5B Hawk 5B | 52756 | 2022-057AA | HE360 | May 25, 2022 | 93 min, 97.7° | Active | ◉ |
| HAWK-5C Hawk 5C | 52754 | 2022-057Y | HE360 | May 25, 2022 | 93 min, 97.7° | Active | ◉ |
| HAWK-4C Hawk 4C | 52170 | 2022-033P | HE360 | Apr 1, 2022 | 87 min, 97.3° | Reentered | ◉ |
| HAWK-4A Hawk 4A | 52167 | 2022-033L | HE360 | Apr 1, 2022 | 87 min, 97.3° | Reentered | ◉ |
| HAWK-4B Hawk 4B | 52165 | 2022-033J | HE360 | Apr 1, 2022 | 87 min, 97.3° | Reentered | ◉ |
| HAWK-3A Hawk 3A | 48957 | 2021-059CG | HE360 | Jun 30, 2021 | 92 min, 97.7° | Active | ◉ |
| HAWK-3C Hawk 3C | 48948 | 2021-059BX | HE360 | Jun 30, 2021 | 92 min, 97.7° | Active | ◉ |
| HAWK-3B Hawk 3B | 48931 | 2021-059BE | HE360 | Jun 30, 2021 | 92 min, 97.7° | Active | ◉ |
| HAWK-2B Hawk 2B | 47508 | 2021-006CZ | HE360 | Jan 24, 2021 | 94 min, 97.2° | Active | ◉ |
| HAWK-2A Hawk 2A | 47505 | 2021-006CW | HE360 | Jan 24, 2021 | 94 min, 97.2° | Active | ◉ |
| HAWK-2C Hawk 2C | 47502 | 2021-006CT | HE360 | Jan 24, 2021 | 94 min, 97.2° | Active | ◉ |
Frequently asked questions
How many Defiant satellites are there?
The catalog lists 18 objects built on the Defiant bus. 14 are in orbit and 4 have reentered.
How many Defiant satellites are in orbit?
14 Defiant objects are currently in orbit, of which 12 carry an active status.
Who builds the Defiant bus?
The Defiant bus is most commonly built by UTIAS.
When did the first Defiant satellite launch?
The first cataloged Defiant satellite launched in 2021, and the most recent in 2025.