Tiros I Satellite Bus
Data current as of 2026-07-20.
The Tiros I bus accounts for 11 cataloged objects, of which 11 are in orbit and 0 are active. Most are built by RCA. The largest operator on this bus is ESSA. The first launched in 1965, the most recent in 1969.
11
In orbit
0
Active
11
Total launched
0
Reentered
Tiros I launched per year
Still in orbit Click a year to list its satellites.
Typical specifications
Most common values across cataloged Tiros I satellites.
| Manufacturer | RCA |
|---|---|
| Purpose | Meteorology |
| Launch mass | 138 kg |
| Dry mass | 138 kg |
| Length | 0.6 m |
| Diameter | 1.1 m |
| Span | 1.1 m |
| Shape | Cyl |
| Power | Solar cells, batteries |
| Propulsion | ? |
| Equipment | 2 x AVCS (#T9, 1, 3, 5, 7, 9); 2 x APT (#2, 4, 6, 8); FPR (#3, 5, 7, 9) |
| Typical orbit | 115 min period, 102° inclination |
Top operators
ESSA 10 NASA 1
Top countries
US 11
Tiros I satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| ESSA 9 (TOS-G) ESSA 9 | 03764 | 1969-016A | ESSA | Feb 26, 1969 | 115 min, 101.4° | Inactive | ◉ |
| ESSA 8 (TOS-F) ESSA 8 | 03615 | 1968-114A | ESSA | Dec 15, 1968 | 115 min, 101.7° | Inactive | ◉ |
| ESSA 7 (TOS-E) ESSA 7 | 03345 | 1968-069A | ESSA | Aug 16, 1968 | 115 min, 101.6° | Inactive | ◉ |
| ESSA 6 (TOS-D) ESSA 6 | 03035 | 1967-114A | ESSA | Nov 10, 1967 | 115 min, 102.0° | Inactive | ◉ |
| ESSA 5 ESSA 5 | 02757 | 1967-036A | ESSA | Apr 20, 1967 | 114 min, 102.0° | Inactive | ◉ |
| ESSA 4 (TOS-B) ESSA 4 | 02657 | 1967-006A | ESSA | Jan 26, 1967 | 113 min, 102.1° | Inactive | ◉ |
| ESSA 3 (TOS-A) ESSA 3 | 02435 | 1966-087A | ESSA | Oct 2, 1966 | 115 min, 101.1° | Inactive | ◉ |
| ESSA 2 (OT-2) ESSA 2 | 02091 | 1966-016A | ESSA | Feb 28, 1966 | 113 min, 101.2° | Inactive | ◉ |
| ESSA 1 (OT-3) ESSA 1 | 01982 | 1966-008A | ESSA | Feb 3, 1966 | 99 min, 97.8° | Inactive | ◉ |
| TIROS 10 Tiros 10 | 01430 | 1965-051A | ESSA | Jul 2, 1965 | 100 min, 98.5° | Inactive | ◉ |
| TIROS 9 Tiros 9 | 00978 | 1965-004A | GSFC | Jan 22, 1965 | 119 min, 96.4° | Inactive | ◉ |
Frequently asked questions
How many Tiros I satellites are there?
The catalog lists 11 objects built on the Tiros I bus. 11 are in orbit and 0 have reentered.
How many Tiros I satellites are in orbit?
11 Tiros I objects are currently in orbit, of which 0 carry an active status.
Who builds the Tiros I bus?
The Tiros I bus is most commonly built by RCA.
When did the first Tiros I satellite launch?
The first cataloged Tiros I satellite launched in 1965, and the most recent in 1969.