TheMeteor spacecraft areweather observation satellites launched by theSoviet Union andRussia since theCold War. The Meteor satellite series was initially developed during the 1960s.^[1] The Meteor satellites^{[clarification needed]} were designed to monitor atmospheric and sea-surfacetemperatures,humidity,radiation,sea ice conditions, snow-cover, andclouds.^{[not verified in body]} Between 1964 and 1969, a total of eleven Soviet Union Meteor satellites were launched.

Unlike the United States, which has separate civilian and military weather satellites, the Soviet Union used a single weather satellite type for both purposes.^[2]

Meteor Prototype launches

Meteor-1 was a set of fully operational Russian meteorological satellite launched from thePlesetsk site. The satellites were placed in a near-circular, near-polar prograde orbit to provide near-global observations of the earth's weather systems, cloud cover, ice and snow fields, and reflected and emitted radiation from the dayside and nightside of the earth-atmosphere system for operational use by the Soviet Hydrometeorological Service. 31 satellites were launched between 1969 and 1981.

Meteor-1 launches

Meteor-1-25, also called "Meteor-Priroda-2", launched on 15 May 1976 by the USSR out of Plesetsk on aVostok-2M.^[6] It was a meteorological satellite that provided global observations of the earth's weather systems, cloud cover, ice and snow fields, vertical profiles of temperature and moisture, and reflected and emitted radiation from the dayside and nightside of the earth-atmosphere system for operational use by the Soviet Hydrometeorological Service. It carried an East German-designed experimental infrared Fourier spectrometers for on-orbit testing of the new instrument for weather observation. The satellite ceased operations on three years later and is now a derelict spacecraft.^[7]

The Meteor-2 series, based on the Meteor-1, was the second generation of Soviet meteorological satellites. They were launched into orbit at first by the Vostok-2M launch vehicle until that was replaced by theTsyklon-3 launch vehicle in the early 1980s. Between 1975 and 1993, 21 Meteor-2's were launched. They were flown in non-sun-synchronous polar orbits with altitudes between 850 and 950 km and inclinations of 81-82º. They weighed about 1,300 kg and had two solar arrays.^[8]

The instruments consisted of three television-type (frame technique) VIS and IR scanners, a five-channel scanning radiometer and a radiometer (RMK-2) for measuring radiation flux densities in the near-Earth space.

In addition to its regular payload, Meteor-2-21 carried a unique Fizeau Retro Reflector Array (RRA) for Satellite Laser Ranging applications.

Several of the satellites have begun to break up and create debris. #16 broke up in 1998 after a propulsion failure. #18 broke up the following year for unknown reasons. #4 broke up in March 2004. #17 broke up in June 2005.^[9]

Meteor 2-2 launched on 6 January 1977 by the USSR out ofPlesetsk on aVostok 2-M with 1st Generation Upper Stage.^[10] It was an earth science satellite that performed cloud observation and IR temperature/humidity sounding. It ceased operations on 6 July 1978.^[11] Since then, the satellite had broken up into several pieces of debris.

Meteor 2-5 launched on 31 October 1979 by the USSR out ofPlesetsk on aVostok 2-M with 1st Generation Upper Stage.^[10] It has undergone several breakup events, the first before January 2005 and the last as recently as 2013 or 2014,^[12] resulting in 83 known pieces of which 60 were still on-orbit as of 2019.^[13]

Meteor 2-6 launched on 9 September 1980 by the USSR out ofPlesetsk on aVostok 2-M with 1st Generation Upper Stage.^[10] It was an Earth Science/Weather satellite that gathered meteorological information and data on penetrating radiation fluxes in circumterrestrial space.^[14] It has since broken apart into multiple pieces ofspace debris.^[15]

Meteor 2-7 launched on May 14, 1981, by the USSR out ofPlesetsk on aVostok 2-M with 1st Generation Upper Stage.^[10] It had a weight of 2,750 kg, and contained the usual suite of communication and orbit control equipment powered by large solar arrays.^[16] Its mission was cloud observation and IR temperature/humidity sounding, using a Radiation Measurement Complex (RMk-2), Infrared Sounding Radiometer, Television Camera and Infrared Instrument.^[17] It ceased operations on 14 November 1982. In March 2004, it experienced an event, or a series of events, that caused it to break into 8 pieces. The cause of this break-up is unknown.^[18]

Meteor 2-8 launched on 25 March 1982 by the USSR out ofPlesetsk on aTsyklon-3^[10] It had a weight of 1,500 kg, and It carried scientific and meteorological instruments, and service systems.^[19] Its mission was cloud observation and IR temperature/humidity sounding, using a Radiation Measurement Complex (RMk-2), Infrared Sounding Radiometer, Television Camera and Infrared Instrument.^[20] It ceased operations on 25 September 1983. On 29 May 1999, it experienced a break-up event that caused it to break into 53 pieces. The cause of this break-up is unknown.^[21]

Meteor-2-21/Fizeau is the twenty-first and last in the Meteor-2 series of Russianmeteorological satellites.^[22]

ILRS Mission Support Status:Satellite Laser Ranging (SLR) tracking support of this satellite was discontinued in October 1998. What makes Meteor-2-21 distinctive from the other meteorological satellites is its uniqueretroreflector array. The nameFizeau is derived from a French physicist,Armand Fizeau who, in 1851, conducted an experiment which tested for theaether convection coefficient. SLR tracking of this satellite was used for preciseorbit determination and theFizeau experiment. The Fizeau experiment tests the theory ofspecial relativity – that distance events that are simultaneous for one observer will not be simultaneous for another observer who is in motion relative to the first observer.^{[citation needed]}

Retroreflector Array (RRA) Characteristics: The retro-reflector array consists of three corner cubes in a linear array with the two outer corner cubes pointing at 45-degree angles relative to the central cube. The central cube is made of fused silica and has a two-lobeFar Field Diffraction Pattern (FFDP) providing nearly equal intensities for compensated and uncompensated velocity aberration. Both outer reflectors have aluminum coating on the reflecting surfaces and near-diffraction-limited FFDPs. One of the end reflectors is made of fused silica with anindex of refraction of 1.46 and should provide partial compensation of the velocity aberration. The other end reflector is made of fused glass with an index of refraction of 1.62 and should provide a perfect compensation of the velocity aberration.^{[citation needed]}

SLR full-rate data fromMOBLAS 4, MOBLAS 7, andMaidanak seem to confirm the presence of the compensating influence of the Fizeau effect.Resur-1, another Russian satellite launched in 1994, has 2 corner cubes reflectors with near diffraction-limited FFDPs, which were specifically designed for the continuation of this experiment.WESTPAC, a future SLR satellite, will verify indisputably the existence or otherwise of the Fizeau effect.^{[citation needed]}

Instrumentation: Meteor-2-21/Fizeau had the following instrumentation on board:^{[citation needed]}

1. Scanning telephotometer
2. Scanning infrared radiometers
3. Radiation measurement complex
4. Retroreflector array

Meteor-Priroda is a series of experimental satellites launched. Internal document of Russian space agency show that it is originally only used to describe Meteor 1-31 at the time, but later extend to all experimental satellites.^[5] It is commonly perceived to only include 6 satellites: Meteor 1-18, Meteor 1-25, Meteor 1-28, Meteor 1-29, Meteor 1-30, and Meteor 1-31.^[4][23] Evidence suggest that Kosmos 1484 should also be included.^[5][24]

Meteor-Priroda series is considered to be prototypes for theResurs O1 satellites.

Meteor-Priroda launches

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The Meteor-3 series was launched 7 times between 1984 and 1994 after a difficult and protracted development program that began in 1972. All the satellites were launched onTsyklon-3 rockets.^[26] These satellites provide weather information including data onclouds, ice and snow cover, atmosphericradiation andhumidity.^{[citation needed]} The Meteor-3 class of satellites orbit in a higher altitude than the Meteor-2 class of satellites thus providing more complete coverage of the Earth's surface. The Meteor-3 has the same payload as the Meteor-2 but also includes an advanced scanningradiometer with better spectral and spatial resolution and aspectrometer for determining totalozone content. Meteorological data is transmitted to four primary sites in the formerSoviet Union in conjunction with about 80 other smaller sites.^{[citation needed]}

Meteor-3 launches

Meteor-3-5, launched in 1991, is in a slightly higher orbit than Meteor-2-21, and operated until 1994. It transmitted on 137.300 MHz. Mechanically, it is similar to Meteor-2-21. Which satellite was in operation depended on the sun angles and consequently the seasons. Meteor-3-5 was usually the (Northern Hemisphere) "summer" satellite while 2-21 was in operation for approximately the half-year centered on winter. The satellite carried the secondTotal Ozone Mapping Spectrometer (TOMS) aloft as the first and the last American-built instrument to fly on a Soviet spacecraft. Launched from thePlesetsk, Russia, facility near theWhite Sea, on 15 August 1991, Meteor-3 TOMS had a unique orbit that presents special problems for processing data. Meteor-3 TOMS began returning data in August 1991 and stopped in December 1994.

The Meteor-3-6/PRARE satellite is the sixth in the Russian Meteor-3 series of meteorological satellites launched in 1994.

ILRS Mission Support Status: Satellite laser ranging and PRARE data was used for precision orbit determination and intercomparison of the two techniques. ILRS tracking support of this satellite was discontinued on 11 November 1995.

Instrumentation: Meteor-3-6 has the following instrumentation on board:

1. Scanning TV-sensor
2. Visible light and infrared radiometers
3. Scanning infrared radiometer
4. Ozone Mapper
5. Precise Range and Range-Rate Equipment (PRARE)
6. Retroreflector array

RetroReflector Array (RRA) Characteristics: The retro-reflector array is a box wing annulus with a diameter of 28 cm and has 24 corner cube reflectors.

The Meteor-3M series of satellites was to be an advanced series of polar orbiters with one 1.4 km resolution visible channel and a ten-channel radiometer with 3 km resolution. Initially four Meteor-3M satellites were planned, however due to financial difficulties only one was launched.^[29]

The first Meteor-M satellite,Meteor-M No.1, was launched 17 September 2009 at 16:55:07 UTC fromBaikonur by aSoyuz-2-1b/Fregat rocket. Its mission ended in 2014.^[30]

The second satellite,Meteor-M No.2, was launched 8 July 2014 at 16:58:28 UTC from Baikonur by a Soyuz-2-1b/Fregat rocket. Its mission is scheduled to last 5 years.

On 27 November 2017, the launch ofMeteor-M No.2-1 was lost after a programming error;^[31][32] also lost were 18 smaller satellites from other nations.

On 5 July 2019, the replacement satellite for the failed Meteor-M No.2-1 satellite, theMeteor-M No.2-2 (also known asMeteor M2-2) was launched fromVostochny Cosmodrome.^[33]

On 18 December 2019, image downlink from Meteor-M No.2-2 ceased. Tracking revealed the craft had suffered degradation in orbit with a 2 km (1.2 mi) decrease in perigee.NORAD was not able to identify any space object involved in a collision.Roscosmos later confirmed that the satellite had suffered a decompression of its thermal control system following what is presumed to be a micrometeoroid impact. Following the incident, the spacecraft was automatically switched into a low-power mode and ground operators worked to restore the satellite's orbit and orientation. By 25 December 2019, the satellite had resumed controlled flight, but the future of its mission remains uncertain.^[34][35]

More Meteor-M satellites are currently being developed. Meteor-M No.2-3 was successfully launched on 27 June 2023, with three more satellites in various stages of development.^[36]Meteor-M No.2-4 was successfully launched on 29 February 2024 at 05:43 UTC,^[37] while Meteor-M No.2-5 is scheduled to be launched later in 2024, and No.2-6 in 2025.^[38]

Meteor-M launches

• Elektro–L, Russian geosynchronous meteorological satellites

• Weather satellites of the Soviet Union
• Weather satellites of Russia
• Earth observation satellites of the Soviet Union
• Satellite series
• Derelict satellites orbiting Earth
• Spacecraft that broke apart in space

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