Spacecraft launched in 2004

Formosat-2 (Chinese: 福爾摩沙衛星二號, formerly known as ROCSAT-2) is a decommissioned Earth observation satellite formerly operated by the National Space Organization (NSPO) of Taiwan. It was a high-resolution photographic surveillance satellite with a daily revisit capability. Images are commercially available from Astrium (formerly Spot Image).

Gravity Probe B (GP-B) was a satellite-based experiment whose objective was to test two previously-unverified predictions of general relativity: the geodetic effect and frame-dragging. This was to be accomplished by measuring, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth-orbiting satellite at 650 km (400 mi) of altitude, crossing directly over the poles.

Neil Gehrels Swift Observatory, previously called the Swift Gamma-Ray Burst Explorer, is a NASA three-telescope space observatory for studying gamma-ray bursts (GRBs) and monitoring the afterglow in X-ray, and UV/visible light at the location of a burst. It was launched on 20 November 2004, aboard a Delta II launch vehicle. Headed by principal investigator Neil Gehrels until his death in February 2017, the mission was developed in a joint partnership between Goddard Space Flight Center (GSFC) and an international consortium from the United States, United Kingdom, and Italy. The mission is operated by Pennsylvania State University as part of NASA's Medium Explorer program (MIDEX).

Ekspress-AM1 (Russian: Экспресс-АМ1, meaning Express-AM1) is a Russian domestic communications satellite. It belongs to the Russian Satellite Communications Company (RSCC) based in Moscow, Russia. To provide of communications services (digital television, telephony, videoconferencing, data transmission, the Internet access) and to deploy satellite networks by applying VSAT technology to Russia and its neighbors (CIS).

Ekspress-AM11 (Russian: Экспресс-АМ11, meaning Express-AM11) is a Russian communications satellite. It belongs to the Russian Satellite Communications Company (RSCC) based in Moscow, Russia.

AMC-16 is an American communications satellite. Owned by SES Americom, AMC-16 was designed to be placed in geostationary orbit, following launch on an Atlas V space vehicle.

AMC-15 is an American communications satellite. Owned by SES Americom, AMC-15 was designed to be placed in geostationary orbit, following launch on a Proton-M / Briz-M space vehicle.

AMC-10 (formerly GE-10) is an American geostationary communications satellite that was launched by an Atlas-IIAS launch vehicle at 23:46:02 UTC on 5 February 2004. The 2,315 kg (5,104 lb) satellite will provide high-definition digital video channels to North America through its 24 C-band transponders, over 135° West longitude. It will replace the current GE Satcom C-4 satellite after a few months of tests.

Kosmos 2411 (Russian: Космос 2411 meaning Cosmos 2411) is one of a set of three Russian military satellites launched in 2004 as part of the GLONASS satellite navigation system. It was launched with Kosmos 2412 and Kosmos 2413. NORAD apparently call this satellite Kosmos 2413, and instead call Kosmos 2413 Kosmos 2411.

Telstar 14 or Estrela do Sul 1 (Southern Star 1) is a commercial communications satellite in the Telstar series built by Space Systems/Loral (SS/L) for Telesat to provide Ku-band communications to South America and the Southern United States. Estrela do Sul 1 was launched by Sea Launch using a Zenit-3SL carrier rocket on 11 Jan 2004 for geosynchronous orbit at 63 degrees west.