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.
Triton has a retrograde orbit
-- moving clockwise around the planet Neptune while most other bodies in the solar system revolve counterclockwise--and it may host what would be the only known liquid-Nitrogen ocean.
Scattered into a highly elliptical, retrograde orbit
, it would have been subjected to intense tides.
Work already has begun on the next Orion capsule, which will launch for the first time on top of NASA's new Space Launch System rocket and travel to a distant retrograde orbit
around the moon.
Asteroid Mission The public imagination has been captured by the mission NASA announced in April to redirect an asteroid into a stable retrograde orbit
in the vicinity of the moon using cutting-edge space technology, such as solar electric propulsion.
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.
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
Triton is the largest of Neptune's now 14 known moons but is considered an irregular moon due to its retrograde orbit
, which travels in the opposite direction of Neptune's rotation.
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.
A 70 metric-ton (77 ton) SLS will send Orion to a distant retrograde orbit
around the moon on Exploration Mission-1 in the first test of the fully integrated Orion and SLS system.
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.