IS Satellite Bus
Data current as of 2026-07-20.
The IS bus accounts for 26 cataloged objects, of which 8 are in orbit and 0 are active. 18 have reentered. Most are built by TSKBM/KB1. The largest operator on this bus is PKO. The first launched in 1967, the most recent in 1982.
8
In orbit
0
Active
26
Total launched
18
Reentered
IS launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged IS satellites.
| Manufacturer | TSKBM/KB1 |
|---|---|
| Purpose | ASAT |
| Launch mass | 1400 kg |
| Dry mass | 1400 kg |
| Length | 4.2 m |
| Diameter | 1.8 m |
| Span | 4.2 m |
| Shape | Cyl + Truss |
| Power | Batteries |
| Typical orbit | 111 min period, 66° inclination |
Top operators
PKO 26
Top countries
SU 26
IS satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| COSMOS 1379 Kosmos-1379 | 13281 | 1982-060A | PKO | Jun 18, 1982 | 94 min, 65.1° | Reentered | ◉ |
| COSMOS 1258 Kosmos-1258 | 12337 | 1981-024A | PKO | Mar 14, 1981 | 98 min, 65.8° | Reentered | ◉ |
| COSMOS 1243 Kosmos-1243 | 12160 | 1981-010A | PKO | Feb 2, 1981 | 98 min, 65.8° | Reentered | ◉ |
| COSMOS 1174 Kosmos-1174 | 11765 | 1980-030A | PKO | Apr 18, 1980 | 99 min, 66.1° | Inactive | ◉ |
| COSMOS 1009 Kosmos-1009 | 10904 | 1978-050A | PKO | May 19, 1978 | 109 min, 65.9° | Reentered | ◉ |
| COSMOS 970 Kosmos-970 | 10531 | 1977-121A | PKO | Dec 21, 1977 | 106 min, 65.9° | Inactive | ◉ |
| COSMOS 961 Kosmos-961 | 10434 | · | PKO | Oct 26, 1977 | · | Reentered | ◉ |
| COSMOS 918 Kosmos-918 | 10065 | 1977-050A | PKO | Jun 17, 1977 | 88 min, 65.1° | Reentered | ◉ |
| COSMOS 910 Kosmos-910 | 10014 | · | PKO | May 23, 1977 | · | Reentered | ◉ |
| COSMOS 886 Kosmos-886 | 09634 | 1976-126A | PKO | Dec 27, 1976 | 115 min, 65.8° | Inactive | ◉ |
| COSMOS 843 Kosmos-843 | 09043 | 1976-071A | PKO | Jul 21, 1976 | 89 min, 65.1° | Reentered | ◉ |
| COSMOS 814 Kosmos-814 | 08806 | 1976-034A | PKO | Apr 13, 1976 | 90 min, 65.1° | Reentered | ◉ |
| COSMOS 804 Kosmos-804 | 08694 | 1976-015A | PKO | Feb 16, 1976 | 96 min, 65.9° | Reentered | ◉ |
| COSMOS 462 Kosmos-462 | 05646 | 1971-106A | PKO | Dec 3, 1971 | 88 min, 65.7° | Reentered | ◉ |
| COSMOS 404 Kosmos-404 | 05113 | 1971-027A | PKO | Apr 4, 1971 | 92 min, 65.0° | Reentered | ◉ |
| COSMOS 397 Kosmos-397 | 04964 | 1971-015A | PKO | Feb 25, 1971 | 113 min, 65.7° | Inactive | ◉ |
| COSMOS 375 Kosmos-375 | 04598 | 1970-091A | PKO | Oct 30, 1970 | 111 min, 62.8° | Inactive | ◉ |
| COSMOS 374 Kosmos-374 | 04594 | 1970-089A | PKO | Oct 23, 1970 | 111 min, 62.9° | Inactive | ◉ |
| COSMOS 373 Kosmos-373 | 04590 | 1970-087A | PKO | Oct 20, 1970 | 88 min, 62.9° | Reentered | ◉ |
| COSMOS 316 Kosmos-316 | 04282 | 1969-108A | PKO | Dec 23, 1969 | 87 min, 49.4° | Reentered | ◉ |
| COSMOS 291 Kosmos-291 | 04058 | 1969-066A | PKO | Aug 6, 1969 | 88 min, 62.2° | Reentered | ◉ |
| COSMOS 252 Kosmos-252 | 03530 | 1968-097A | PKO | Nov 1, 1968 | 112 min, 62.3° | Inactive | ◉ |
| COSMOS 249 Kosmos-249 | 03504 | 1968-091A | PKO | Oct 20, 1968 | 111 min, 62.3° | Inactive | ◉ |
| COSMOS 248 Kosmos-248 | 03503 | 1968-090A | PKO | Oct 19, 1968 | 87 min, 62.2° | Reentered | ◉ |
| COSMOS 217 Kosmos-217 | 03216 | · | PKO | Apr 24, 1968 | · | Reentered | ◉ |
| COSMOS 185 Kosmos-185 | 03013 | 1967-104A | PKO | Oct 27, 1967 | 89 min, 64.0° | Reentered | ◉ |
Frequently asked questions
How many IS satellites are there?
The catalog lists 26 objects built on the IS bus. 8 are in orbit and 18 have reentered.
How many IS satellites are in orbit?
8 IS objects are currently in orbit, of which 0 carry an active status.
Who builds the IS bus?
The IS bus is most commonly built by TSKBM/KB1.
When did the first IS satellite launch?
The first cataloged IS satellite launched in 1967, and the most recent in 1982.