Definition, Meaning & Synonyms | English word PERIHELION

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Definitions of PERIHELION

1. (astronomy) The point in the elliptical orbit of a comet, planet, etc., where it is nearest to the Sun.
2. (figurative) The highest point or state; the peak, zenith.

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Examples of Using PERIHELION in a Sentence

• Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition in 2012.
• A near-Earth object (NEO) is any small Solar System body orbiting the Sun whose closest approach to the Sun (perihelion) is less than 1.
• March 1 (approximately) – The Great Comet of 1744, one of the brightest ever seen, reaches perihelion.
• At about the same time a colleague, Jack Lang, started Perihelion (later Perihelion Hardware) to create a new Transputer-based workstation that would run HeliOS.
• Apsides pertaining to orbits around the Sun have distinct names to differentiate themselves from other apsides; these names are aphelion for the farthest and perihelion for the nearest point in the solar orbit.
• April 20 – Halley's comet reappears after 76 years, and Mark Twain dies at his home, Stormfield, the day after the comet's perihelion.
• With their redesignated dual missions, the Vega probes became part of the Halley Armada, a group of space probes that studied Halley's Comet during its 1985/1986 perihelion.
• Objects move fastest at perihelion (closest approach to the Sun) and slowest at aphelion (furthest distance from the Sun).
• Pasiphae is also known to be in a secular resonance with Jupiter (tying the longitude of its perijove with the longitude of perihelion of Jupiter).
• Even more notable are the perihelic oppositions of Mars which occur approximately every 16 years, and are distinguished because Mars is closest to earth and Jupiter perihelion making it even closer to Earth.
• In the 1850s, Urbain Le Verrier made detailed calculations of Mercury's orbit and found a small discrepancy in the planet's perihelion precession from predicted values.
• It is suggested that an exploratory fly-by mission to Sedna near its perihelion through a Jupiter gravity assist could be completed in 24.
• This list consists of all types of TNO subgroups: classical Kuiper belt objects, also known as "cubewanos", the resonant trans-Neptunian objects with their main and higher-order resonant subgroups, the scattered disc objects (SDOs), and the extreme trans-Neptunian objects including the ESDOs, EDDOs, and sednoids, which have a semi-major axis of at least 150 AU and a perihelion (closest approach to the Sun) greater than that of Neptune.
• Asbolus is currently classified as a SN centaur since Saturn is considered to control the perihelion and Neptune controls the aphelion.
• In addition to identifying impact risks, the project also obtains other scientific information, including: improving the known population distribution in the main belt, finding the cometary distribution at larger perihelion distances, determining the distribution of NEOs as a product of collisional history and transport to the inner Solar System, and identifying potential targets for flight projects.
• In 2018, the announcement of the high perihelion inner Oort cloud object 541132 Leleākūhonua (nicknamed "The Goblin") by Sheppard et al.
• The dynamics of many Atira asteroids resemble the one induced by the Kozai-Lidov mechanism, which contributes to enhanced long-term orbital stability, since there is no libration of the perihelion.
• He has also recovered more than 75 comets starting in 1985 (since comets are subject to non-gravitational forces due to outgassing and solar wind, it is often a challenge to predict their exact position and rediscover them each time they make a new perihelion approach).
• Euphrosyne has a high orbital inclination and eccentricity having nodes near perihelion and aphelion, Euphrosyne's perihelion lies at the northernmost point of its orbit.
• They believed that the measurements of the perihelion of Mercury and the null result of the Michelson–Morley experiment might be explained in other ways, and the results of the Eddington eclipse experiment were experimentally problematic enough to be dismissed as meaningless by the more devoted doubters.
• He also made measurements of solar oblateness which were useful in understanding the perihelion precession of Mercury's orbit, one of the classical tests of general relativity.
• The meteor stream is viewable around April 24 but only in years around the parent comet's perihelion date, the next being in 2023.
• Similar to inner grazers, these orbit with a semi-major axis greater than Jupiter, but still have a perihelion distance within Jupiter's perihelion and aphelion, a>5.
• Although small sungrazers can completely evaporate during such a close approach to the Sun, larger sungrazers can survive many perihelion passages.
• For specific types of orbits, terms such as argument of perihelion (for heliocentric orbits), argument of perigee (for geocentric orbits), argument of periastron (for orbits around stars), and so on, may be used (see apsis for more information).

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