The Day Space Became Crowded
Eight years ago, a single Indian rocket launched 104 satellites into orbit, marking a pivotal moment when space tracking professionals realized the dawn of a new, congested era in orbital operations
INTELSAT 4-F1 (07815)
COSPAR: 1975-042A | Alt Name: INTELSAT IV F1
Image
Additional Sources
Launch Details
Launch Date
May 22, 1975
Launch Site
Launch Pad
LC36A
Launch Vehicle
Atlas SLV-3D Centaur
Orbital Elements
NORAD ID
07815
International Designator
1975-042A
Epoch
Fri, 03 Jul 2026 04:00:41 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
8.22°
Right Ascension
306.06°
Eccentricity
Calculating...
Argument of Perigee
273.97°
Period
1450.68 min
Mean Motion
0.99 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Polar Plot
3D Visualization
Basic Satellite Info
Name
INTELSAT 4-F1
Alternative Name
INTELSAT IV F1
Type
Payload
Status
Non-operational
Owner
INTEL
Country
INTELSAT
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 07815U 75042A 26184.16715273 -.00000245 00000-0 00000-0 0 9994
2 07815 8.2219 306.0633 0011748 273.9736 86.0373 0.99263618122112
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
5.3
Diameter
2.4
Span
5.3
Dry Mass
531
Launch Mass
664
Shape
Cyl + 2 Dish
Radar Cross Section
12.5
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
INTELSAT IV F1
Purpose
Communication
Mission
Communication
Manufacturer
HSES
Life Expectancy
Unknown
Bus
HS-312
Configuration
HS-312
Motor
SVM-4A
Equipment
12 C-band transponders
Power System
Solar cells (body mounted), 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.
X Report 7 Oct 2025
SpaceX successfully launched 28 Starlink satellites on October 7, further expanding its broadband constellation while hosting an active launch schedule this week.
FAA Advances Approval for 44 Starship Launches From Pad 39A | KeepTrack X Report
FAA advances environmental review for up to 44 Starship launches from Kennedy Space Center pad 39A. SpaceX wraps January with dual-coast Starlink launches. Crew-12 timeline tied to Artemis 2 schedule.
NordSpace Atlantic Spaceport Complex
Canada's sovereign space access finally has a construction site. How NordSpace is building the Atlantic Spaceport Complex in Newfoundland - and what the scrubbed Taiga launch reveals about the path to orbit.
X Report 18 Sep 2025
SpaceX gears up for a busy week with new Starship testing and enhanced Starlink capabilities on the horizon.
Space Brief 18 May 2025
Today's briefing highlights recent launches and failures, including an Indian radar satellite setback, successful Rocket Lab missions, and China's debut of upgraded rocket technology.
Space Brief 15 Feb 2025
Today's highlights include SpaceX's record-setting Starlink launch, Redwire's contract for USSF, and military satellite developments.
Space Brief 6 Jun 2025
Today's space news features significant discussions on the funding of Space Force, advancements in hypersonic technology, and the potential impacts of spectrum auction plans on border defense systems.