Essa

Essa may refer to:

ESSA as an acronym may refer to:

See also

ESSA-9

ESSA-9, also known as TOS-G, was a meteorological satellite. ESSA-9 replaced the ESSA-7 satellite.

Launch & orbit

The ESSA-9 was launched on a three stage Delta rocket from Cape Canaveral, Florida. The launch occurred at 07:47 UTC (02:47 EDT) on 26 February 1969. The spacecraft was placed in a sun-synchronous orbit of 101.4° inclination. Immediately after launch ESSA-9 had a perigee of 1,427.0 kilometers (886.7 mi) and an apogee of 1,508.0 kilometers (937.0 mi), giving it an orbital period of 115.2 minutes, or a mean motion of 12.5 orbits per day.

Spacecraft

The ESSA-9 spacecraft was similar to the TIROS series of satellites, having an 18-sided polygonal shape that measured 42 inches (110 cm) in diameter and 22 inches (56 cm) high. It weighed 320 pounds (150 kg). The body of the ESSA-9 was made of aluminum alloy and stainless steel. The shell of the craft was covered with 10,020 solar cells. The solar cells recharged the 63 nickel–cadmium batteries during the time the spacecraft was in sunlight. The ESSA-9 employed the same cartwheel-style stabilization as the TIROS-9 satellite. The satellite used a Magnetic Attitude Spin Coil (MASC) to control its attitude while in orbit. The magnetic field induced by the MASC's current interacted with the earth's magnetic field to provide the torque necessary to maintain a desired spin rate of 9.225 rpm.

ESSA-1

ESSA-1 (or OT-3) was a spin-stabilized operational meteorological satellite.

Launch

ESSA-1 was launched on 3 February 1966 at 07:41 UTC. It was launched atop a Delta rocket from Cape Canaveral, Florida. The spacecraft had a mass of 304 kilograms (670 lb) at the time of launch. ESSA-1 had an inclination of 97.91°, and an orbited the earth once every 100 minutes. Its perigee was 702 kilometers (379 nmi) and apogee was 845 kilometers (456 nmi).

ESSA-1 had a similar design to that of the TIROS satellite series. It was an 18-sided right prism, measuring 107 centimeters (42 in) across opposite corners and 56 centimeters (22 in). It had a reinforced baseplate, which carried most of the subsystems and a cover assembly (hat). ESSA-1 had approximately 10,000 1-cm by 2-cm solar cells, which charged 21 nickel–cadmium batteries. ESSA-1 was designed to take pictures of daytime cloud cover, record them and transmit them when it was in range of a ground acquisition station.

The satellite spin rate and attitude were determined primarily by a Magnetic Attitude Spin Coil (MASC). The MASC was a current Carrying coil mounted in the cover assembly. The magnetic field induced by the coil interacted with that of the Earth's magnetic field, and provided the necessary torque to maintain a desired spin rate of 9.225 revolutions per minute (rpm). Five small solid-fuel thrusters mounted on the baseplate provided a secondary means of controlling the spin rate.

Continuum

Continuum may refer to:

Companies and organizations

Games

Continuum (Ligeti)

Continuum for harpsichord is a musical composition by György Ligeti composed in 1968, and dedicated to the contemporary harpsichordist, Antoinette Vischer. The composer describes the conception and result of its technique:

Amy Bauer (2004, p. 130) describes the piece as trompe-l'œil, creating "a sense of stasis through extremely rapid activity." She compares it to a patient's description of their schizophrenic experience of, "an intense cerebral activity in which inner experiences took place at greatly increased speed, so that much more than usual happened per minute of external time. The result was to give an effect of slow motion." (Sass 1992)

This piece has also been arranged for barrel organ and for two player pianos by the composer.

The piece has also been compared by classical music reviewers to the magnetic fluctuations of comet 67P/Churyumov–Gerasimenko as detected by the space probe Philae after the fluctuations were sped up 10,000x in order to be audible.

References

Continuum (season 3)

The third season of the Showcase television series Continuum premiered on March 16, 2014 and concluded on June 22, 2014. The series was created by Simon Barry, and centers on Kiera Cameron (Rachel Nichols) as she travels back in time from 2077 to 2012 pursuing a group of terrorists. Kiera is focused on stopping the terrorists, unifying the time line and finding a way back to her time and family. All episode titles in this season use the word "Minute".

Cast and characters

Regular

Recurring