COURIER 1B

About This Satellite

Courier 1B launched on October 4, 1960 to test satellite communication using stored voice and telegraph messages. Ground stations at Fort Monmouth, New Jersey, and Salinas, Puerto Rico, loaded or retrieved traffic during contact. The spacecraft carried messages between contacts instead of depending exclusively on an uninterrupted, simultaneous link between both stations.

Magnetic tape was part of the communications payload

Five onboard tape recorders divided the work: one handled voice and four stored high-speed messages. Storage and radio transmission were separate steps. Receiving a message successfully did not by itself prove that its destination had received it; the stored information still had to be played back and downlinked during a suitable contact.

Communications ended after seventeen days

The Army history reports a communications breakdown after seventeen days. The mission demonstrated a technique, but the continued existence of an orbital catalog record is not evidence that Courier still stores or retransmits usable traffic.

Mission reference: US Army Fort Monmouth Historical Office: Courier 1B communications experiments. Editorial review: 2026-09-14.

A relayed photograph was not a picture taken from orbit

Nine days after launch, a photograph sent from Fort Monmouth was relayed through Courier to Salinas. This demonstrated facsimile transmission: the image originated on Earth. It was not an Earth-observation image captured by a camera aboard Courier.

Reference: US Army: Courier photograph relay between Fort Monmouth and Salinas.

Active relay and store-and-forward describe different features

NASA's communications history describes Courier's solar and battery power and electronic repeaters that converted uplink frequencies to downlink frequencies. Active means the spacecraft used powered electronics to receive and retransmit, unlike a passive reflector. Store-and-forward describes when the message was delivered. Courier combined these ideas, whereas merely bouncing a signal from a reflective satellite provides neither onboard recording nor a powered retransmitter.

Reference: NASA: Exploring the Unknown, volume III, Courier and active satellite communications.

Reading this orbital snapshot

Based on TLE epoch: 2026-09-05. Estimated altitude ranges from 962 km at perigee to 1,208 km at apogee, a difference of 246 km. The orbital period is about 106.9 minutes. Eccentricity 0.01649 shows why a single altitude cannot describe the whole path. In a two-body approximation, perigee speed is 1.03 times apogee speed. These are mean-element estimates, not instantaneous measurements. Distance per orbit uses an ellipse approximation.

Saved build snapshot. If a valid TLE is retrieved, this explanation and the orbit panel update together. Otherwise this dated snapshot is retained.

Ground track is not sensor coverage

An inclination of 28.33 degrees implies approximate geocentric ground-track limits of 28.3 degrees north and south. This is a prograde orbit, moving in the same general direction as Earth rotation. The plotted line marks the point beneath the object. It does not represent camera coverage, radio reception, or a guaranteed visible pass.

Accuracy and missing information

The introductory record describes the build snapshot. The orbital snapshot explanation and orbit panel share any successfully retrieved TLE; check the displayed epoch. Reentered objects retain historical data only. Mission history is not rewritten by TLE updates. TLE/SGP4 positions are predictions and can change after maneuvers or updated observations. The 14-day stale-data cutoff is a display safeguard, not an accuracy guarantee. Local passes are geometric predictions, not a visibility forecast. No verified operator or mission status means unknown, not active. Do not use this catalog for collision avoidance or operational flight decisions.

Catalog sources: CelesTrak SATCAT: NORAD 58 · GCAT: S00058 (source update 2026 Sep 4 2345:57). Supplementary metadata: SatNOGS DB, retrieved 2026-09-05T12:57:25.375Z. Page assembled 2026-09-15. GCAT phase codes describe trajectory phases, not mission health.

Learn more: TLE data · Perigee and apogee · Ground tracks · JOT (Jewawud Live Orbital Map)

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