AS4000 Satellite Bus
Data current as of 2026-07-20.
The AS4000 bus accounts for 10 cataloged objects, of which 10 are in orbit and 1 are active. Most are built by LMTEW. The largest operator on this bus is INMAR. The first launched in 1985, the most recent in 1998.
10
In orbit
1
Active
10
Total launched
0
Reentered
AS4000 launched per year
Still in orbit Click a year to list its satellites.
Typical specifications
Most common values across cataloged AS4000 satellites.
| Manufacturer | LMTEW |
|---|---|
| Purpose | Communication |
| Launch mass | 1008 kg |
| Dry mass | 850 kg |
| Length | 7.6 m |
| Diameter | 2.1 m |
| Span | 20.7 m |
| Shape | Box + 2 Pan |
| Power | 2 deployable solar arrays, batteries |
| Propulsion | Star 37FM |
| Design life | 13 years |
| Equipment | 22 (+11) L-band transponders (22W Power amplifiers), C-band uplink |
| Typical orbit | 1440 min period, 15° inclination |
Top operators
Top countries
I-INM 5 US 4 L 1
AS4000 satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| INMARSAT 3-F5 INMARSAT III F-5 | 25153 | 1998-006B | INMAR | Feb 4, 1998 | 1436 min, 9.8° | Active | ◉ |
| INMARSAT 3-F4 INMARSAT III F-4 | 24819 | 1997-027A | INMAR | Jun 3, 1997 | 1447 min, 11.6° | Inactive | ◉ |
| INMARSAT 3-F3 INMARSAT III F-3 | 24674 | 1996-070A | INMAR | Dec 18, 1996 | 1440 min, 10.4° | Inactive | ◉ |
| INMARSAT 3-F2 INMARSAT III F-2 | 24307 | 1996-053A | INMAR | Sep 6, 1996 | 1440 min, 9.9° | Inactive | ◉ |
| INMARSAT 3-F1 INMARSAT III F-1 | 23839 | 1996-020A | INMAR | Apr 3, 1996 | 1440 min, 10.7° | Inactive | ◉ |
| ACTS ACTS | 22796 | 1993-058B | LERC | Sep 12, 1993 | 1436 min, 14.6° | Inactive | ◉ |
| MARS OBSERVER Mars Observer | 22136 | 1992-063A | JPL | Sep 25, 1992 | · | Inactive | ◉ |
| ASTRA 1A Astra 1A | 19688 | 1988-109B | SES | Dec 11, 1988 | 1464 min, 14.8° | Inactive | ◉ |
| SATCOM K1 Satcom K1 | 16482 | 1986-003B | AMCG | Jan 12, 1986 | 1446 min, 14.7° | Inactive | ◉ |
| SATCOM K2 Satcom K2 | 16276 | 1985-109D | AMC | Nov 27, 1985 | 1446 min, 14.7° | Inactive | ◉ |
Frequently asked questions
How many AS4000 satellites are there?
The catalog lists 10 objects built on the AS4000 bus. 10 are in orbit and 0 have reentered.
How many AS4000 satellites are in orbit?
10 AS4000 objects are currently in orbit, of which 1 carry an active status.
Who builds the AS4000 bus?
The AS4000 bus is most commonly built by LMTEW.
When did the first AS4000 satellite launch?
The first cataloged AS4000 satellite launched in 1985, and the most recent in 1998.