Secor Satellite Bus
Data current as of 2026-07-20.
The Secor bus accounts for 10 cataloged objects, of which 8 are in orbit and 0 are active. 2 have reentered. Most are built by ITT. The largest operator on this bus is ACE/GIMR. The first launched in 1964, the most recent in 1970.
8
In orbit
0
Active
10
Total launched
2
Reentered
Secor launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged Secor satellites.
| Manufacturer | ITT |
|---|---|
| Purpose | Geodesy |
| Launch mass | 18 kg |
| Dry mass | 18 kg |
| Length | 0.2 m |
| Diameter | 0.4 m |
| Span | 0.5 m |
| Shape | Box |
| Power | Solar cells, batteries |
| Propulsion | ? |
| Equipment | TR-27 SECOR transponder (#1, 2, 3); C-101 SECOR transponder (#4); TR-30A SECOR transponder (#6, 7, 8, 9); MAT SECOR transponder (#10, 12); TR-30A SECOR transponder (#11, 13); |
| Typical orbit | 103 min period, 90° inclination |
Top operators
ACE/GIMR 8 ARTOPL 2
Top countries
US 10
Secor satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| TOPO 1 TOPO I | 04363 | 1970-025B | ARTOPL | Apr 8, 1970 | 107 min, 99.9° | Inactive | ◉ |
| SECOR 13 (EGRS 13) EGRS XIII | 03891 | 1969-037B | ARTOPL | Apr 14, 1969 | 107 min, 99.6° | Inactive | ◉ |
| SECOR 9 (EGRS 9) EGRS IX | 02861 | 1967-065A | ACE/GIMR | Jun 29, 1967 | 172 min, 90.0° | Inactive | ◉ |
| SECOR 8 (EGRS 8) EGRS VIII | 02520 | 1966-089B | ACE/GIMR | Oct 5, 1966 | 168 min, 89.8° | Inactive | ◉ |
| SECOR 7 (EGRS 7) EGRS VII | 02411 | 1966-077B | ACE/GIMR | Aug 19, 1966 | 168 min, 90.3° | Inactive | ◉ |
| SECOR 6 (EGRS 6) EGRS VI | 02205 | 1966-051B | ACE/GIMR | Jun 9, 1966 | 90 min, 89.9° | Reentered | ◉ |
| SECOR 4 (EGRS 4) EGRS IV | 01315 | 1965-027B | ACE/GIMR | Apr 3, 1965 | 111 min, 90.2° | Inactive | ◉ |
| SECOR 2 (EGRS 2) EGRS II | 01250 | 1965-017B | ACE/GIMR | Mar 11, 1965 | 88 min, 89.9° | Reentered | ◉ |
| SECOR 3 EGRS III | 01208 | 1965-016E | ACE/GIMR | Mar 9, 1965 | 103 min, 70.1° | Inactive | ◉ |
| SECOR 1B EGRS I | 00729 | 1964-001C | ACE/GIMR | Jan 11, 1964 | 103 min, 69.9° | Inactive | ◉ |
Frequently asked questions
How many Secor satellites are there?
The catalog lists 10 objects built on the Secor bus. 8 are in orbit and 2 have reentered.
How many Secor satellites are in orbit?
8 Secor objects are currently in orbit, of which 0 carry an active status.
Who builds the Secor bus?
The Secor bus is most commonly built by ITT.
When did the first Secor satellite launch?
The first cataloged Secor satellite launched in 1964, and the most recent in 1970.