A distant retrograde orbit (DRO), as most commonly conceived, is a spacecraft orbit around a moon that is highly stable because of its interactions with...

Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is...

Orion completed one flyby of the Moon on November 21, entered a distant retrograde orbit for six days, and completed a second flyby of the Moon on December...

stable orbits in the lunar vicinity, such as halo orbits and distant retrograde orbits. Some halo orbits remain over particular regions of the lunar surface...

lunar south pole. Distant retrograde orbit (DRO): A stable circular retrograde orbit (usually referring to Lunar Distant Retrograde Orbit). Stability means...

more distant planets retrograde more frequently, as they do not move as much in their orbits while Earth completes an orbit itself. The retrograde motion...

appear to travel in an oblong retrograde loop around the planet. . In contrast to true satellites, quasi-satellite orbits lie outside the planet's Hill...

spacecrafts, DRO-A and DRO-B, into distant retrograde orbit around the Moon, but the mission failed to reach the strived for orbit, remaining stranded in a highly...

retrograde compared to the direction of Earth's rotation: 0° represents an equatorial orbit, and 90° represents a polar orbit. Sun-synchronous orbits...

Earth's gravitational influence is stronger than the more distant Sun and planets. Objects orbiting the Earth must be within this radius, otherwise, they...

than 90° and less than 180° is a retrograde orbit. An inclination of exactly 180° is a retrograde equatorial orbit. For impact-generated moons of terrestrial...

measuring instrument used in machinery and metalworking Distant retrograde orbit, a highly stable lunar orbit Dro, slang for hydroponically-grown marijuana Dynamic...

Launch System (SLS) that would also send an Orion spacecraft on a Distant Retrograde Orbit. The first tentative steps of returning to crewed lunar missions...

ESM placed the spacecraft into distant retrograde orbit around the Moon, and subsequently extracted it from that orbit and sent it back to Earth. The...

controlled soft landing, while Luna 10 became the first mission to enter orbit, and in 1968 Zond 5 became the first mission to carry terrestrial lifeforms...

capsule spent 10 days in a 57,000-kilometer (31,000-nautical-mile) distant retrograde orbit around the Moon before returning to Earth. Artemis 2, the first...

elliptic orbit or elliptical orbit is a Kepler orbit with an eccentricity of less than 1; this includes the special case of a circular orbit, with eccentricity...

non-inclined orbit is an orbit coplanar with a plane of reference. The orbital inclination is 0° for prograde orbits, and π (180°) for retrograde ones.[citation...

Orbital elements are the parameters required to uniquely identify a specific orbit. In celestial mechanics these elements are considered in two-body systems...

A Molniya orbit (Russian: Молния, IPA: [ˈmolnʲɪjə] , "Lightning") is a type of satellite orbit designed to provide communications and remote sensing coverage...

The Moon orbits Earth in the prograde direction and completes one revolution relative to the Vernal Equinox and the stars in about 27.32 days (a tropical...

and their orbits are similarly tilted. These alignments suggest that an undiscovered planet may be shepherding the orbits of the most distant known Solar...

the orbital speed of an astronomical body or object (e.g. planet, moon, artificial satellite, spacecraft, or star) is the speed at which it orbits around...

graveyard orbit, also called a junk orbit or disposal orbit, is an orbit that lies away from common operational orbits. One significant graveyard orbit is a...

A geostationary orbit, also referred to as a geosynchronous equatorial orbit (GEO), is a circular geosynchronous orbit 35,786 km (22,236 mi) in altitude...

eccentricity, but not the orbital period (to first order). A prograde or retrograde impulse (i.e. an impulse applied along the orbital motion) changes both...

behavior. The spacecraft would approach Mars on a hyperbolic orbit, and a final retrograde burn would slow the spacecraft enough to be captured by Mars...

demonstrate capabilities past Earth orbit, yet within a few days' return contingency. Lunar Distant Retrograde Orbit (DRO), encompassing Earth-Moon L1 and...

astrodynamics, the osculating orbit of an object in space at a given moment in time is the gravitational Kepler orbit (i.e. an elliptic or other conic...

value of 0 is a circular orbit, values between 0 and 1 form an elliptic orbit, 1 is a parabolic escape orbit (or capture orbit), and greater than 1 is...