19 relations: Apsis, Brett J. Gladman, Giga-, Irregular moon, Jet Propulsion Laboratory, Julian year (astronomy), Kilogram, Kilometre, Matthew J. Holman, Mercury (planet), Natural satellite, Neptune, Nereid, Orbital eccentricity, Orbital inclination, Perihelion and aphelion, Psamathe (moon), Retrograde and prograde motion, Sun.
An apsis (ἁψίς; plural apsides, Greek: ἁψῖδες) is an extreme point in the orbit of an object.
Brett James Gladman (born 1966) is a Canadian astronomer, discoverer of moons and minor planets, and a full professor at the University of British Columbia's Department of Physics and Astronomy in Vancouver, British Columbia.
Giga is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 000).
In astronomy, an irregular moon, irregular satellite or irregular natural satellite is a natural satellite following a distant, inclined, and often eccentric and retrograde orbit.
The Jet Propulsion Laboratory (JPL) is a federally funded research and development center and NASA field center in Pasadena, California, United States, with large portions of the campus in La Cañada Flintridge, California.
In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI), and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK, also known as "Le Grand K" or "Big K"), a cylinder of platinum-iridium alloy stored by the International Bureau of Weights and Measures at Saint-Cloud, France.
The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; or) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.
Matthew J. Holman (born 1967) is a Smithsonian Astrophysicist and lecturer at Harvard University.
Mercury is the smallest and innermost planet in the Solar System.
A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planet or minor planet (or sometimes another small Solar System body).
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
In Greek mythology, the Nereids (Νηρηΐδες Nereides, sg. Νηρηΐς Nereis) are sea nymphs (female spirits of sea waters), the 50 daughters of Nereus and Doris, sisters to Nerites.
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
Orbital inclination measures the tilt of an object's orbit around a celestial body.
The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.
Psamathe (Latin: Psamathē; Greek: Ψαμάθη), also known as Neptune X, is a retrograde irregular satellite of Neptune.
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 the central object (right figure).
The Sun is the star at the center of the Solar System.