I1K Satellite Bus
Data current as of 2026-07-20.
The I1K bus accounts for 11 cataloged objects, of which 10 are in orbit and 4 are active. 1 have reentered. Most are built by ISAC. The largest operator on this bus is Indian Space Research Organisation. The first launched in 2011, the most recent in 2020.
10
In orbit
4
Active
11
Total launched
1
Reentered
I1K launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged I1K satellites.
| Manufacturer | ISAC |
|---|---|
| Purpose | Navigation |
| Launch mass | 1425 kg |
| Dry mass | 598 kg |
| Length | 1.6 m |
| Diameter | 1.5 m |
| Span | 10 m |
| Shape | Box + 2 Pan |
| Power | 2 deployable solar arrays, batteries |
| Propulsion | ISRO LAM |
| Design life | 12 years |
| Equipment | Navigation payload, CDMA ranging payload, laser retro-reflector |
| Typical orbit | 1436 min period, 5° inclination |
Top operators
Top countries
IN 11
I1K satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| CMS-01 CMS 1 | 47256 | 2020-099A | ISRO | Dec 17, 2020 | 1436 min, 0.0° | Active | ◉ |
| IRNSS-1I IRNSS-R1I | 43286 | 2018-035A | ISRO | Apr 11, 2018 | 1436 min, 28.8° | Active | ◉ |
| IRNSS-1H & PSLV R/B IRNSS-R1H | 42928 | 2017-051A | ISRO | Aug 31, 2017 | 89 min, 19.1° | Reentered | ◉ |
| IRNSS-1G IRNSS-R1G | 41469 | 2016-027A | ISRO | Apr 28, 2016 | 1436 min, 5.3° | Inactive | ◉ |
| IRNSS-1F IRNSS-R1F | 41384 | 2016-015A | ISRO | Mar 10, 2016 | 1436 min, 5.4° | Active | ◉ |
| IRNSS-1E IRNSS-R1E | 41241 | 2016-003A | ISRO | Jan 20, 2016 | 1436 min, 33.3° | Inactive | ◉ |
| IRNSS-1D IRNSS-R1D | 40547 | 2015-018A | ISRO | Mar 28, 2015 | 1470 min, 19.5° | Inactive | ◉ |
| IRNSS-1C IRNSS-R1C | 40269 | 2014-061A | ISRO | Oct 15, 2014 | 1436 min, 6.6° | Inactive | ◉ |
| IRNSS-1B IRNSS-R1B | 39635 | 2014-017A | ISRO | Apr 4, 2014 | 1436 min, 28.9° | Active | ◉ |
| IRNSS-1A IRNSS-R1A | 39199 | 2013-034A | ISRO | Jul 1, 2013 | 1436 min, 35.8° | Inactive | ◉ |
| GSAT-12 GSAT-12 | 37746 | 2011-034A | ISRO | Jul 15, 2011 | 1457 min, 5.4° | Inactive | ◉ |
Frequently asked questions
How many I1K satellites are there?
The catalog lists 11 objects built on the I1K bus. 10 are in orbit and 1 have reentered.
How many I1K satellites are in orbit?
10 I1K objects are currently in orbit, of which 4 carry an active status.
Who builds the I1K bus?
The I1K bus is most commonly built by ISAC.
When did the first I1K satellite launch?
The first cataloged I1K satellite launched in 2011, and the most recent in 2020.