Intelsat I

It was built by the Space and Communications Group of Hughes Aircraft Company (later Hughes Space and Communications Company, and now Boeing Satellite Systems) for COMSAT, which activated it on June 28, 1965. It was based on the Syncom series of satellites that Hughes had previously built for NASA to demonstrate that communications via synchronous-orbit satellite were feasible. Its booster was a Thrust Augmented Delta (Delta D). After a series of maneuvers, it reached its geosynchronous orbital position over the Atlantic Ocean at 28° West longitude, where it was put into service.

Intelsat I F1

INTELSAT I Early Bird
Mission type	Communications
Operator	Communications Satellite Corporation (COMSAT)
COSPAR ID	1965-028A
SATCAT no.	01317
Mission duration	18 months (planned) 4 years and 4 months
Spacecraft properties
Bus	HS-303
Manufacturer	Hughes Aircraft
Launch mass	149 kg
Power	40 watts
Start of mission
Launch date	April 6, 1965, 23:47:50 UTC
Rocket	Delta D
Launch site	Cape Canaveral, LC-17A
Contractor	Douglas Aircraft Company
Entered service	June 28, 1965
End of mission
Deactivated	August 1969
Orbital parameters
Reference system	Geocentric
Regime	GSO
Perigee altitude	35,767.8 kilometres (22,225.1 mi)
Apogee altitude	35,855.1 kilometres (22,279.3 mi)
Inclination	3.1270°
Period	1437 minutes
Revolution no.	8068
Intelsat Intelsat II F-1 →

It helped provide the first live TV coverage of a spacecraft splashdown, that of Gemini 6 in December 1965. Originally slated to operate for 18 months, Early Bird was in active service for 4 years and 4 months, being deactivated in January 1969, although it was briefly activated in June of that year to serve the Apollo 11 flight when the Atlantic Intelsat satellite failed. It was deactivated again in August 1969 and has been inactive since that time (except for a brief reactivation in 1990 to commemorate its 25th launch anniversary), although it remains in orbit.

The Early Bird satellite was the first to provide direct and nearly instantaneous contact between Europe and North America, handling television, telephone, and telefacsimile transmissions. It was fairly small, measuring nearly 76 cm × 61 cm (2.5 ft × 2.0 ft) and weighing 34.5 kg (76 lb).

Early Bird was one of the satellites used in the then record-breaking broadcast of Our World.

A full-scale model, or a flight test model, hung in the main lobby of the Intelsat headquarters building, Washington, D.C. before moving to McLean, VA in 2014. It was donated to the National Air and Space Museum in 2022.

• "Early Bird", 1965 song named after Intelsat I
• List of communications satellite firsts
• Syncom, the first geosynchronous and geostationary satellites