Space Force Cancels OCX GPS Ground System, Space Brief 21 Apr 2026
Space Force cancels the OCX GPS ground system after RTX failures and stands up a cislunar task force. SpaceX launches the 10th and final GPS III.
ESSA 4 (TOS-B) (02657)
COSPAR: 1967-006A | Alt Name: ESSA 4
Image
Additional Sources
Launch Details
Launch Date
January 26, 1967
Launch Site
AFWTR
Launch Pad
SLC2E
Launch Vehicle
Thor Delta E
Orbital Elements
NORAD ID
02657
International Designator
1967-006A
Epoch
Mon, 20 Jul 2026 12:09:09 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
102.08°
Right Ascension
41.61°
Eccentricity
Calculating...
Argument of Perigee
214.05°
Period
113.40 min
Mean Motion
12.70 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Polar Plot
3D Visualization
Explore in the Catalog
Basic Satellite Info
Name
ESSA 4 (TOS-B)
Alternative Name
ESSA 4
Type
Payload
Status
Non-operational
Owner
ESSA
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 02657U 67006A 26201.50635552 -.00000058 00000+0 -40634-4 0 9996
2 02657 102.0833 41.6114 0072786 214.0456 173.3729 12.69891735756773
Source: Celestrak
Summary
Apologies, there is no summary for this satellite yet. I am working to generate these for every object in the catalog, but it is going to take time.
Physical Characteristics
Length
0.6
Diameter
1.1
Span
1.1
Dry Mass
132
Launch Mass
132
Shape
Cyl
Radar Cross Section
0.7499
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
TOS B
Purpose
Meteorology
Mission
Meteorology
Manufacturer
RCA
Life Expectancy
Unknown
Bus
Tiros I
Configuration
Unknown
Motor
?
Equipment
2 x AVCS (#T9, 1, 3, 5, 7, 9); 2 x APT (#2, 4, 6, 8); FPR (#3, 5, 7, 9)
Power System
Solar cells, batteries
ADCS
Unknown
Transmitter Frequency
Unknown
Map
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration
Satellite Articles
View All Posts »Learn more about satellites and other related topics.
Starlink Mobile US Plan, Ship 40 Static Fire, X Report 27 Jun 2026
Starlink mobile service is planned for the US as SpaceX fires Ship 40's single Raptor in a prelaunch test, with 10,689 Starlink satellites working.
Australian Space Centre Cape York
When your landlord won't sign the lease, you move. How Equatorial Launch Australia abandoned Arnhem Land and pivoted to Queensland - and what it means for Australia's equatorial launch ambitions.
Space Brief 9 Aug 2025
Today's briefing covers SpaceX's latest Starlink launch, Rocket Lab's upcoming Neutron rocket launch, NASA's lunar nuclear reactor project, and more.
X Report 7 Nov 2024
SpaceX prepares for sixth Starship flight, slated for mid-November, following successful fifth test in October.
Starlink Update: March 2024
As of March 2024, SpaceX's Starlink has made remarkable strides in its quest to provide global broadband internet access. With an astounding number of satellites already in orbit and ambitious plans for expansion, Starlink is on track to dominate Earth's orbit in the coming years.
Growing Threat of Space Junk
Over 27,000 high-speed pieces of space junk now threaten vital satellites, requiring sophisticated tracking and urgent innovation of orbital debris removal methods like harpoons and nets.
SpaceX Wins $178.5M Space Force Missile Tracking Contract | KeepTrack Space Brief
SpaceX awarded $178.5M Space Force contract for missile tracking satellite launches beginning 2027. Pentagon also extends GPS modernization support with $45M Raytheon order.