What was launched first, The Wide Field Infrared Explorer or The Orbiting Astronomical Observatory 2?
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Wide Field Infrared Explorer The Wide Field Infrared Explorer (WIRE) was a satellite launched on March 5, 1999, on the Pegasus XL rocket into polar orbit between 409 and above the Earth's surface. WIRE was intended to be a four-month infrared survey of the entire sky at 21-27 micrometres and 9-15 micrometres, specifically focusing on starburst galaxies and luminous protogalaxies.
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Orbiting Astronomical Observatory 2 The Orbiting Astronomical Observatory 2 (OAO-2, nicknamed Stargazer) was a space observatory launched on December 7, 1968.
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Visible Infrared Imaging Radiometer Suite The Visible Infrared Imaging Radiometer Suite (VIIRS) is a sensor designed and manufactured by the Raytheon Company on board the Suomi National Polar-orbiting Partnership (Suomi NPP) weather satellite. VIIRS is one of five key instruments associated with the Suomi NPP that was launched on October 28, 2011. VIIRS is a whiskbroom scanning radiometer that collects imagery and radiometric measurements of the land, atmosphere, cryosphere, and oceans in the visible and infrared bands of the electromagnetic spectrum.
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SACI-2 The SACI-2 was a Brazilian experimental satellite, designed and built by the Brazilian Institute for Space Research (INPE). It was launched on 11 December 1999 from the INPE base in Alcântara, Maranhão, by the Brazilian VLS-1 V02 rocket. Due to failure of its second stage, the rocket veered off course and had to be destroyed 3 minutes and 20 seconds after launch.
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Overwhelmingly Large Telescope The Overwhelmingly Large Telescope (OWL) was a conceptual design by the European Southern Observatory (ESO) organization for an extremely large telescope, which was intended to have a single aperture of 100 meters in diameter. Because of the complexity and cost of building a telescope of this unprecedented size, ESO has elected to focus on the 39-meter diameter European Extremely Large Telescope instead.
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Voyager 1 Voyager 1 is a space probe launched by NASA on September 5, 1977. Part of the Voyager program to study the outer Solar System, "Voyager 1" launched 16 days after its twin, "Voyager 2". Having operated for 2017-1977- years, 11-09+ months and  days as of none }} , the spacecraft still communicates with the Deep Space Network to receive routine commands and return data. At a distance of 140 AU from the Sun as of September 22, 2017, it is the farthest spacecraft from Earth as well as the farthest man-made object. It is also the most distant object in the solar system whose location is known, even farther than Eris (96 AU) and V774104 (~103 AU).
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Spacecraft magnetometer Spacecraft magnetometers are magnetometers used aboard spacecraft and satellites, mostly for scientific investigations, plus attitude sensing. Magnetometers are among the most widely used scientific instruments in exploratory and observation satellites. These instruments were instrumental in the discovery of the Van Allen radiation belts around Earth by Explorer 1, and have detailed the magnetic fields of the Earth, Moon, Sun, Mars, Venus and other planets. There are ongoing missions using magnetometers, including attempts to define the shape and activity of Saturn's core.
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Luna 2 Luna 2 (E-1A series) or Lunik 2 was the second of the Soviet Union's Luna programme spacecraft launched to the Moon. It was the first spacecraft to reach the surface of the Moon, and the first man-made object to land on another celestial body. On September 13, 1959, it hit the Moon's surface east of Mare Imbrium near the craters Aristides, Archimedes, and Autolycus.
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Multi Unit Spectroscopic Explorer The Multi Unit Spectroscopic Explorer (MUSE) is a second generation instrument installed at the Very Large Telescope (VLT) of the European Southern Observatory (ESO).
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Heweliusz (satellite) Heweliusz is the second Polish scientific satellite launched in 2014 as part of the Bright-star Target Explorer (BRITE) programme. The spacecraft was launched aboard a Chang Zheng 4B rocket in August 2014. Heweliusz is an optical astronomy spacecraft built by the Space Research Centre of the Polish Academy of Sciences and operated by Centrum Astronomiczne im. Mikołaja Kopernika PAN; it is one of two Polish contributions to the BRITE constellation along with the Lem satellite. It is named after Johannes Hevelius.
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Cartosat-2C Cartosat-2C is an Earth observation satellite in a sun-synchronous orbit and is a fifth flight unit of Cartosat series of satellites. The satellite is built at space application centre Ahemdabad, launched and maintained by the Indian Space Research Organisation. It was launched on 22 June 2016.
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WorldView-3 WorldView-3 is a commercial Earth observation satellite owned by DigitalGlobe. It was launched on 13 August 2014 to become DigitalGlobe's sixth satellite in orbit, joining "Ikonos" which was launched in 1999, "QuickBird" in 2001, "WorldView-1" in 2007, "GeoEye-1" in 2008, and "WorldView-2" in 2009. "WorldView-3" provides commercially available panchromatic imagery of 0.31 m resolution, eight-band multispectral imagery with 1.24 m resolution, shortwave infrared imagery at 3.7 m resolution, and CAVIS (Clouds, Aerosols, Vapors, Ice, and Snow) data at 30 m resolution.
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TUGSAT-1 TUGSAT-1, also known as BRITE-Austria and CanX-3B, is the first Austrian satellite. It is an optical astronomy spacecraft operated by the Graz University of Technology as part of the international BRIght-star Target Explorer programme.
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OSCAR 1 OSCAR I (aka OSCAR 1) is the first amateur radio satellite launched by Project OSCAR into Low Earth Orbit. OSCAR I was launched December 12, 1961 by a Thor-DM21 Agena B launcher from Vandenberg Air Force Base, Lompoc, California. The satellite, a rectangular box (30 x 25 x 12 cm) weighing 10 kg., was launched as a secondary payload (ballast) for Corona 9029, also known as Discoverer 36, the eighth and final launch of a KH-3 satellite.
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Kosmos 2379 Kosmos 2379 (Russian: "Космос 2379" meaning "Cosmos 2379") is a Russian US-KMO missile early warning satellite which was launched in 2001 as part of the Russian Space Forces' Oko programme. The satellite is designed to identify missile launches using infrared telescopes.
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Lunar Orbiter 3 The Lunar Orbiter 3 was a spacecraft launched by NASA in 1967 as part of the Lunar Orbiter Program. It was designed primarily to photograph areas of the lunar surface for confirmation of safe landing sites for the Surveyor and Apollo missions. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data.
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Astron (spacecraft) Astron was a Soviet spacecraft launched on 23 March 1983 at 12:45:06 UTC, using Proton launcher, which was designed to fulfill an astrophysics mission. It was based on the 4MV spacecraft design and was operational for six years as the largest ultraviolet space telescope during its lifetime. The project was headed by Alexandr Boyarchuk.
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Chandra X-ray Observatory The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a Flagship-class space observatory launched on STS-93 by NASA on July 23, 1999. Chandra is sensitive to X-ray sources 100 times fainter than any previous X-ray telescope, enabled by the high angular resolution of its mirrors. Since the Earth's atmosphere absorbs the vast majority of X-rays, they are not detectable from Earth-based telescopes; therefore space-based telescopes are required to make these observations. Chandra is an Earth satellite in a 64-hour orbit, and its mission is ongoing as of 2017 .
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ACRIMSAT The Active Cavity Radiometer Irradiance Monitor Satellite, or ACRIMSAT is a defunct satellite and instrument that was one of the 21 observational components of NASA's Earth Observing System program. The instrument followed upon the ACRIM1 and ACRIM2 instruments that were launched on multi-instrument satellite platforms. ACRIMSAT was launched on 20 December 1999 from Vandenberg Air Force Base as the secondary payload on the Taurus rocket that launched KOMPSAT. It was placed into a high inclination, 700 km. sun-synchronous orbit from which the ACRIM3 instrument monitored total solar irradiance (TSI). Contact with the satellite was lost on 14 December 2013.
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PicoSAT PicoSAT, launched on September 30, 2001, is a real time tracking satellite. The name "PICO" combines the first letters of all four of its experiments (see below). PICOSat series are designed for a minimum of one year of on-orbit operations.
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IRS-P3 IRS-P3 was an experimental earth observation mission undertaken by ISRO. The objectives of the mission was processing and interpretation of data generated by its two payloads, the Wide Field sensor and Modular Optoelectric Sensor, developed by the German Aerospace Center).
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Pioneer Venus Orbiter The Pioneer Venus Orbiter, also known as Pioneer Venus 1 or Pioneer 12, was a mission to Venus conducted as part of the Pioneer Venus project. Launched in May 1978 atop an Atlas-Centaur rocket, the spacecraft was inserted into an elliptical orbit around Venus on December 4, 1978. It returned data on Venus until October 1992.