retrograde orbit

retrograde orbit

[′re·trə‚grād ′ȯr·bət]
(astronomy)
Motion in an orbit opposite to the usual orbital direction of celestial bodies within a given system; specifically, of a satellite, motion in a direction opposite to the direction of rotation of the primary. Also known as retrograde motion.
References in periodicals archive ?
During the first mission of SLS and Orion, NASA plans to send the spacecraft into a distant lunar retrograde orbit - a stable orbit that would involve a flyby of the moon.
NASAs Game Changing Development Program (GCD), managed by the agencys Space Technology Mission Directorate, and the National Institute of Aerospace (NIA) are seeking novel and robust concepts for in-space assembly of spacecraft particularly tugs, propelled by solar electric propulsion (SEP), that transfer payloads from low earth orbit (LEO) to a lunar distant retrograde orbit (LDRO).
The most important, with respect to the primary science objectives, was the sunrise terminator, which was when the spacecraft was passing from the lighted portion of the moon to the dark portion of the moon, since the spacecraft was in a retrograde orbit.
ARM's SEP-powered robotic spacecraft will test new trajectory and navigation techniques in deep space, working with the moon's gravity to place the asteroid in a stable lunar orbit called a distant retrograde orbit.
The study also showed that if Earth revolved around the sun in the opposite direction, called a retrograde orbit, it wouldn't need a moon at all to have a climate about as stable as it has today.
Like 1P/Halley, stream meteoroids have a retrograde orbit around the Sun, meaning that they enter the upper atmosphere at a high velocity of around 66 km/sec.
Moreover, this asteroid, 2015 BZ509 ("Bee-Zed" for short), also shares Jupiter's orbital space, making it the only known object in the solar system to have a retrograde orbit and to share a planet's orbital space.
The test flight will send Orion into lunar distant retrograde orbit a wide orbit around the moon that is farther from Earth than any human-rated spacecraft has ever traveled.
This planet is quite particular because it has a retrograde orbit and, evenmore, its orbit is quite inclined in angle respect to the star's equator.
Another stream in a retrograde orbit, the Leonids impact on the upper atmosphere at 70km/sec, and these high-energy collisions produce not only bright events, but also persistent ionisation trains which can sometimes be of exceptionally long duration (up to several minutes).
This is a highly inclined, retrograde orbit that precesses 1[degrees] per day, enabling the spacecraft to view Earth at the same local time on successive passes.
On May 30, 2009, a Japanese collaboration team led by Norio Narita (National Astronomical Observatory of Japan) used the Subaru Telescope's High Dispersion Spectrograph (HDS) to observe the HAT-P-7 planetary system, which is about 1000 light-years distant from Earth, and found the first evidence of a retrograde orbit of the extrasolar planet HAT-P-7b.

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