Transit 1 Satellite Bus
Data current as of 2026-07-22.
The Transit 1 bus accounts for 3 cataloged objects, of which 1 are in orbit and 0 are active. 2 have reentered. Most are built by APL. The largest operator on this bus is BUWEPS. The first launched in 1960, the most recent in 1962.
1
In orbit
0
Active
3
Total launched
2
Reentered
Transit 1 launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged Transit 1 satellites.
| Manufacturer | APL |
|---|---|
| Launch mass | 121 kg |
| Dry mass | 121 kg |
| Length | 0.9 m |
| Diameter | 0.9 m |
| Span | 0.9 m |
| Shape | Sphere |
| Typical orbit | 108 min period, 50° inclination |
Top operators
BUWEPS 2 ARPA/BUWEPS 1
Top countries
US 3
Transit 1 satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| ANNA 1B ANNA 1B | 00446 | 1962-060A | BUWEPS | Oct 31, 1962 | 108 min, 50.1° | Inactive | ◉ |
| TRANSIT 3B & LOFTI 1 Transit III-B | 00087 | 1961-007A | BUWEPS | Feb 22, 1961 | 88 min, 28.4° | Reentered | ◉ |
| TRANSIT 1B Transit I-B | 00031 | 1960-003B | ARPA/BUWEPS | Apr 13, 1960 | 89 min, 51.2° | Reentered | ◉ |
Frequently asked questions
How many Transit 1 satellites are there?
The catalog lists 3 objects built on the Transit 1 bus. 1 are in orbit and 2 have reentered.
How many Transit 1 satellites are in orbit?
1 Transit 1 objects are currently in orbit, of which 0 carry an active status.
Who builds the Transit 1 bus?
The Transit 1 bus is most commonly built by APL.
When did the first Transit 1 satellite launch?
The first cataloged Transit 1 satellite launched in 1960, and the most recent in 1962.