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.

ESSA-8

ESSA-8 was a weather satellite launched by NASA on December 15, 1968. It operated for 2,644 days until it was deactivated on March 12, 1976. ESSA-8 was launched from Vandenberg Air Force Base, CA.

ESSA-8 was an 18-sided polygon. It measured 110 centimetres (42 in) in diameter by 22 inches (56 cm) in height, with a mass of 130 kilograms (290 lb). It was made of aluminum alloy and stainless steel covered with 10,020 solar cells. The cells charged 63 nickel–cadmium batteries, which served as a power source. The satellite could take 8 to 10 pictures every 24 hours. Each photo covered a 5,200-square-kilometre (2,000 sq mi) area at a resolution of 3.2 kilometres (2 mi) per pixel.

ESSA-8's mission was to replace ESSA-6, and provide detailed cloud pattern photography to ground stations worldwide. Partners in the project included NASA, ESSA, RCA, the U.S. Weather Bureau, and the NMC.

References

External links

Mix

Mix, mixes, mixture, or mixing may refer to:

In mathematics, science, and technology

In electronics and telecommunications

Other uses in mathematics, science, and technology

DJ mix

A DJ mix or DJ mixset is a sequence of musical tracks typically mixed together to appear as one continuous track. DJ mixes are usually performed using a DJ mixer and multiple sounds sources, such as turntables, CD players, digital audio players or computer sound cards, sometimes with the addition of samplers and effects units, although it's possible to create one using sound editing software.

DJ mixing is significantly different from live sound mixing. Remix services were offered beginning in the late 1970s in order to provide music which was more easily beatmixed by DJs for the dancefloor. One of the earliest DJs to refine their mixing skills was DJ Kool Herc.Francis Grasso was the first DJ to use headphones and a basic form of mixing at the New York nightclub Sanctuary. Upon its release in 2000, Paul Oakenfold's Perfecto Presents: Another World became the biggest selling dj mix album in the US.

Music

A DJ mix is often put together with music from genres that fit into the more general term electronic dance music. Other genres mixed by DJ includes hip hop, breakbeat and disco. Four on the floor disco beats can be used to create seamless mixes so as to keep dancers locked to the dancefloor. Two of main characteristics of music used in dj mixes is a dominant bassline and repetitive beats. Music mixed by djs usually has a tempo which ranges from 120 bpm up to 160 bpm.

Mix (Stellar album)

Mix is the debut studio album by New Zealand Pop rock band Stellar, released by Sony BMG on 29 July 1999. The album debuted at #2 on the RIANZ albums chart, and after seven weeks within the top 10 would finally reach the #1 position. The album would spend a whole 18 weeks within the top 10 on the charts. The album was certified 5x platinum, meaning that it had sold over 75,000 copies in New Zealand.

The album was re-released on 18 February 2000 as a limited edition which included a new cover art and a bonus CD-rom that included the music videos for the singles "Part of Me", "Violent" and "Every Girl" as well as three remixes (these had appeared on previous singles) and an 8-minute documentary. Even after the limited edition's run had finished, all subsequent pressings of the album would feature the new cover.

Mix became the 22nd best-selling album in 2000 in New Zealand. At the New Zealand Music Awards in 2000, Mix won the Album of the Year award.

Track listing

Singles

Stargate SG-1 (season 7)

Season seven of Stargate SG-1, an American-Canadian television series, began airing on June 13, 2003 on Sci Fi. The seventh season concluded after 22 episodes on March 9, 2004 on British Sky One, which overtook the Sci-Fi Channel in mid-season. The series was developed by Brad Wright and Jonathan Glassner. Season seven regular cast members include Richard Dean Anderson, Amanda Tapping, Christopher Judge, Michael Shanks, and Don S. Davis.

Production

With "Fallen", Michael Shanks (Dr. Daniel Jackson) rejoins the cast, and Corin Nemec (Jonas Quinn) gets billed as a "Guest Star" (besides "Fallen"/"Homecoming", he would have his only other guest appearance later in "Fallout"). George Touliatos previously played Pyrus, Shyla's father, in "Need." The scenes with the Goa'uld motherships flying in hyperspace are actually stock footage from the Season 2 episode "The Serpent's Lair." Director Martin Wood has a cameo in "Fallen" as the man in the elevator with Jonas at the beginning of the episode. Peter DeLuise, who directed "Fragile Balance", provided the voice of Loki in the same episode. Christopher Heyerdahl, who played Pallan in "Revisions", would later play the recurring characters of Halling and the Wraith 'Todd' on Stargate Atlantis. Peter LaCroix previously played the Ashrak in "In the Line of Duty".