LOFTI-1

Last updated
LOFTI-1
LOFTI 1.jpg
LOFTI-1 before launch
Mission typeIonospheric
Operator US Navy/NRL
Harvard designation1961 Eta 1
COSPAR ID 1961-007A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 00087 OOjs UI icon edit-ltr-progressive.svg
Spacecraft properties
ManufacturerNRL
Launch mass26 kilograms (57 lb)
Start of mission
Launch date22 February 1961, 03:45 (1961-02-22UTC03:45Z) UTC
Rocket Thor DM-21 Ablestar 313 (AB-007)
Launch site Cape Canaveral LC-17B
End of mission
Decay date30 March 1961 (1961-03-31)
Orbital parameters
Reference system Geocentric
Regime Low Earth
Perigee altitude 167 kilometers (104 mi)
Apogee altitude 1,002 kilometers (623 mi)
Inclination 28.3 degrees
Period 96.4 minutes
Epoch 21 February 1961, 22:50:00 UTC [1]
 

LOFTI-1 was an American satellite which was launched in 1961 and operated by the United States Navy and Naval Research Laboratory. [2] It was used to conduct research into the propagation of very low frequency radio signals in the ionosphere, [3] and to investigate if these signals could be received by submarines. [2] A 136.17 MHz transmitter was used for this investigation. [3]

The launch of LOFTI-1 was conducted at 03:45 UTC on 22 February 1961, using a Thor DM-21 Ablestar rocket flying from Launch Complex 17B at the Cape Canaveral Air Force Station. [4] It was a secondary payload aboard the rocket, with the primary payload being the Transit 3B prototype navigation satellite. The rocket and upper stage used had the serial numbers Thor 313 and Ablestar 007 respectively. The launch resulted in a partial failure, with the spacecraft being placed in a more eccentric orbit than planned, and failing to separate from the upper stage. [2]

LOFTI-1 at the Air and Space Museum Lofti I, Launched 1961 to Improve Submarine Communication (10437798225).jpg
LOFTI-1 at the Air and Space Museum

LOFTI-1 was a 26-kilogram (57 lb) spacecraft, [5] which was powered by six groups of solar cells charging a nickel-cadmium battery. It ended up in a low Earth orbit with a perigee of 167 kilometres (104 mi), an apogee of 1,002 kilometres (623 mi), and 28.3 degrees of inclination. It had an orbital period of 96.4 minutes. Due to the low perigee of its orbit, LOFTI-1 decayed quickly, and reentered the atmosphere on 30 March 1961, less than 37 days after launch. [6] Despite being in the wrong orbit and operating for less time than had been planned, some useful data was returned from the mission. [3] Together with data returned by later satellites, the data returned by LOFTI-1 proved that very low frequency signals were not suitable for satellite communications with submarines. [2] [5]

See also

Related Research Articles

Thor was a US space launch vehicle derived from the PGM-17 Thor intermediate-range ballistic missile. The Thor rocket was the first member of the Delta rocket family of space launch vehicles. The last launch of a direct derivative of the Thor missile occurred in 2018 as the first stage of the final Delta II.

Kosmos 76, also known as DS-P1-Yu No.3 was a Soviet satellite which was used as a radar calibration target for tests of anti-ballistic missiles. It was built by the Yuzhnoye Design Bureau, and launched in 1965 as part of the Dnepropetrovsk Sputnik programme.

Kosmos 101, also known as DS-P1-Yu No.4 was a Soviet satellite which was used as a radar calibration target for tests of anti-ballistic missiles. It was built by the Yuzhnoye Design Bureau, and launched in 1965 as part of the Dnepropetrovsk Sputnik programme.

Kosmos 95, also known as DS-U2-V No.2, was a Soviet satellite which was launched in 1965 as part of the Dnepropetrovsk Sputnik programme. The spacecraft weighed 325 kilograms (717 lb), and was built by the Yuzhnoye Design Office, and was used to conduct classified technology development experiments for the Soviet armed forces.

OPS 3762, also known as FTV-2355, was an American reconnaissance satellite which was launched in 1964. It was the first radar imaging satellite to be launched, and the only Quill spacecraft to fly. Its mission was to demonstrate radar imaging techniques for future missions. However, the programme was cancelled before any more satellites were launched.

FTV-2203, also known as Samos 5, was an American reconnaissance satellite launched in 1961 as part of the Samos programme. It was a film return reconnaissance spacecraft, meaning that it returned images in a film capsule at the end of its mission. FTV-2203 was a Samos-E5 spacecraft, based on the Agena-B. It carried a camera with a focal length of 1.67 metres and a resolution of 1.5 metres.

<span class="mw-page-title-main">Discoverer 17</span> Reconnaissance satellite

Discoverer 17, also known as Corona 9012, was an American optical reconnaissance satellite launched on 12 November 1960 at 20:38:00 GMT. It was the second of ten Corona KH-2 satellites, based on the Agena-B.

<span class="mw-page-title-main">Discoverer 18</span> Reconnaissance satellite

Discoverer 18, also known as Corona 9013, was an American optical reconnaissance satellite launched on 7 December 1960 at 20:24:00 GMT. It was the first successful, and the third of ten total Corona KH-2 satellites, based on the Agena-B.

Discoverer 21, also known as RM-2, was an American satellite which was launched in 1961. It was a technology demonstration spacecraft, based on an Agena-B.

Discoverer 19, also known as RM-1, was an American satellite which was launched in 1960. It was a technology demonstration spacecraft, based on an Agena-B.

<span class="mw-page-title-main">Transit 3B</span> American satellite designed to study geodesy

Transit 3B was an American satellite which was launched in 1961 and operated by the United States Navy. It was a replacement for Transit 3A, which was lost in a launch failure the previous year. It carried instruments to demonstrate navigation and timing systems, and study geodesy to support the development of the Transit satellite navigation system.

<span class="mw-page-title-main">Pegasus 1</span> American satellite

Pegasus 1 or I, known before launch as Pegasus A, was an American satellite which was launched in 1965 to study micrometeoroid impacts in low Earth orbit. It was the first of three Pegasus satellites to be launched. The Pegasus spacecraft were manufactured by Fairchild Hiller, and operated by NASA.

<span class="mw-page-title-main">Pegasus 2</span> American satellite

Pegasus 2 or Pegasus II, known before launch as Pegasus B was an American satellite which was launched in 1965 to study micrometeoroid impacts in Low Earth orbit. It was the second of three Pegasus satellites to be launched, following the launch of Pegasus 1 three months earlier. The Pegasus spacecraft were manufactured by Fairchild Hiller, and operated by NASA.

<span class="mw-page-title-main">Pegasus 3</span> American satellite

Pegasus 3 or III, also known as Pegasus C before launch, was an American satellite which was launched in 1965 to study micrometeoroid impacts in Low Earth orbit. It was the last of three Pegasus satellites to be launched, the previous two having been launched earlier the same year. It was manufactured by Fairchild Hiller, and operated by NASA.

<span class="mw-page-title-main">TD-1A</span>

TD-1A, or Thor-Delta 1A, was a European astrophysical research satellite which was launched in 1972. Operated by the European Space Research Organisation, TD-1A made astronomical surveys primarily in the ultraviolet, but also using x-ray and gamma ray detectors.

Kosmos 35 or Zenit-2 No.21 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1964. A Zenit-2 spacecraft, Kosmos 35 was the twentieth of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).

Kosmos 37 or Zenit-2 No.22 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1964. A Zenit-2 spacecraft, Kosmos 37 was the twentieth of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).

Kosmos 68 or Zenit-2 No.29 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1965. A Zenit-2 spacecraft, Kosmos 68 was the twenty-eighth of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).

Kosmos 78 or Zenit-2 No.30 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1965. A Zenit-2 spacecraft, Kosmos 78 was the thirtieth of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).

Kosmos 104 or Zenit-2 No.36 was a Soviet first-generation low-resolution optical film–return reconnaissance satellite launched in 1966. A Zenit-2 spacecraft, Kosmos 104 was the thirty-second of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).

References

  1. "NASA - NSSDCA - Spacecraft - Trajectory Details". nssdc.gsfc.nasa.gov. Retrieved 2018-05-02.
  2. 1 2 3 4 Krebs, Gunter. "LOFTI 1, 2A". Gunter's Space Page. Retrieved 14 July 2010.
  3. 1 2 3 "Transit 3B". NSSDC Master Catalog. NASA . Retrieved 14 July 2010.
  4. McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 14 July 2010.
  5. 1 2 Wade, Mark. "Lofti". Encyclopedia Astronautica. Archived from the original on 20 November 2010. Retrieved 14 July 2010.
  6. McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 14 July 2010.