United States Air ForceThorad SLV-2G Agena DSpace Launch Complex 3W, Vandenberg SFB, CA, USA
KH-4B 6
Launched
February 5, 1969
Image: NASA
Summary
KH-4B 6 launched on an United States Air Force Thorad SLV-2G Agena D from Space Launch Complex 3W, Vandenberg SFB, CA, USA on February 5, 1969. It was United States Air Force's 478th launch, 4th this year and humanity's 932nd orbital launch attempt. It was the 19th Thorad SLV-2G Agena D flight and the 1st this year. The payload was bound for low Earth orbit (LEO). OPS 3890, one of 4 catalogued objects, reached a 184 × 244 km orbit inclined 81.5°. 4 objects from this launch are catalogued, 2 of them payloads.
- Watch
- No webcast on record.
- Vehicle
- Thorad SLV-2G Agena D · United States Air Force
- Booster
- No booster details on record.
- Mission
- Government/Top Secret · Low Earth Orbit (LEO)
- Milestone
- 19th Thorad SLV-2G Agena D flight · 1st this yearUnited States Air Force's 478th launch4th this yearhumanity's 932nd orbital launch attempt13th orbital launch attempt this year
Flight preview
Orbit: as tracked
OPS 3890 · NORAD 3672 · 1969-010 · Space-Track · tracking 1 of 4 objects
Show the numbers for orbit elements
- Object
- TBA - TO BE ASSIGNED
- Object ID
- 1969-010A
- Epoch
- 1969-02-06 03:23:43 UTC
- Mean motion
- 16.24697526 rev/day
- Eccentricity
- 0.0046047
- Inclination
- 81.5354°
- Ascending node
- 171.9879°
- Arg. of perigee
- 161.1393°
- Mean anomaly
- 199.1623°
- Element set
- 999
- Rev at epoch
- 3
- B*
- 0
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: LEO. Ascent drawn from padside's representative profile.
Catalogued objects
4 catalogued: 2 payloads, 2 components; 3 still in orbit
- OPS 3890 · NORAD 3672 · re-entered February 24, 1969
- OPS 2644 · NORAD 3673 · in orbit
Data from J. McDowell, planet4589.org
About this launch
The KH-4B (Keyhole-4B) was sixth optical reconnaissance satellite version in the Corona-program.
Pad

Space Launch Complex 3W, Vandenberg SFB, CA, USA
33rd launch from Space Launch Complex 3W, 1st this year · 320th from Vandenberg SFB, CA, USA
81 launches from this pad · 919 from Vandenberg SFB, CA, USA
54 days after the previous launch from this pad
Questions
When did KH-4B 6 launch?
KH-4B 6 launched on February 5, 1969. The time is known to the hour, not the minute.
Where can I watch KH-4B 6?
No webcast is on record for this launch.
What rocket launched KH-4B 6?
Thorad SLV-2G Agena D, flown by United States Air Force. Thorad SLV-2G Agena D spec sheet
Where did KH-4B 6 launch from?
Space Launch Complex 3W, Vandenberg SFB, CA, USA.
What orbit did KH-4B 6 reach?
OPS 3890, one of 4 catalogued objects, reached a 184 × 244 km orbit inclined 81.5°.
How many satellites did KH-4B 6 launch?
2 payloads from this launch are catalogued, 1 of them still in orbit (Data from J. McDowell, planet4589.org).
![Thorad-SLV2G Agena-D (Nimbus 3) [NASA]](/media?u=https%3A%2F%2Fthespacedevs-prod.nyc3.digitaloceanspaces.com%2Fmedia%2Fimages%2Fthorad-slv2g_ag_image_20251102061406.jpg&w=1600)