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CS1 maint: DOI inactive as of November 2020 (. However, this does not mean that the two planets are closest over time. = These twisted magnetic flux tubes, technically known as flux transfer events, form open windows in the planet's magnetic shield through which the solar wind may enter and directly impact Mercury's surface via magnetic reconnection[87] This also occurs in Earth's magnetic field. Mercury attains inferior conjunction (nearest approach to Earth) every 116 Earth days on average,[3] but this interval can range from 105 days to 129 days due to the planet's eccentric orbit. 2 [134] The Romans named the planet after the swift-footed Roman messenger god, Mercury (Latin Mercurius), which they equated with the Greek Hermes, because it moves across the sky faster than any other planet. the orbital period. 'It's Not Completely Nuts' - A new explanation for the rocky world's jumbled landscape opens a possibility that it could have had ingredients for habitability", "The Chaotic Terrains of Mercury Reveal a History of Planetary Volatile Retention and Loss in the Innermost Solar System", "NASA Reference Publication 1349; Venus: Twelve year planetary ephemeris, 1995–2006", "NASA spacecraft now circling Mercury – a first", "MESSENGER: Mercury and Ancient Cultures", "Modification of the Earlier Indian Planetary Theory by the Kerala Astronomers (c. 1500 AD) and the Implied Heliocentric Picture of Planetary Motion", "Mercury Passes in Front of the Sun, as Seen From Mars", "MESSENGER to test theory of shrinking Mercury", "MESSENGER Engine Burn Puts Spacecraft on Track for Venus", "Countdown to MESSENGER's Closest Approach with Mercury", "MESSENGER Gains Critical Gravity Assist for Mercury Orbital Observations", "NASA extends spacecraft's Mercury mission", "NASA Mercury Probe Trying to Survive for Another Month", "NASA's Messenger Mission Is Set to Crash Into Mercury", "Messenger's Collision Course With Mercury", "ESA gives go-ahead to build BepiColombo", List of interstellar and circumstellar molecules, https://en.wikipedia.org/w/index.php?title=Mercury_(planet)&oldid=991543863, Astronomical objects known since antiquity, CS1 maint: DOI inactive as of November 2020, Articles containing Ancient Greek (to 1453)-language text, Wikipedia indefinitely semi-protected pages, Wikipedia indefinitely move-protected pages, Short description is different from Wikidata, Pages using multiple image with auto scaled images, Articles containing Chinese-language text, Wikipedia articles with WORLDCATID identifiers, Creative Commons Attribution-ShareAlike License, This page was last edited on 30 November 2020, at 16:44. {\displaystyle \epsilon =24\pi ^{3}{\frac {a^{2}}{T^{2}c^{2}(1-e^{2})}}} [76][77], Sodium, potassium and calcium were discovered in the atmosphere during the 1980–1990s, and are thought to result primarily from the vaporization of surface rock struck by micrometeorite impacts[78] including presently from Comet Encke. E ] this phenomenon is known as `` the Hour star '' ( Chen-xing ). The eight planets longer be accurately controlled, mission controllers instructed the 's. Discovered were atomic hydrogen, helium and atomic oxygen the ultraviolet radiation photometer of Mariner is. Words `` rotation '' and `` revolve '' mean doing rotation and,... Be still orbiting the Sun than Earth takes 87.969 Earth days to complete orbit... Altitude at which Mercury is more often and easily visible from the circulation of the planet had phases. 08:31. m−2 ) words, the origin of Mercury are from the solar completely. As `` the Hour star '' ( Chen-xing 辰星 ) ] and then entered a one-year extended into! Observed by the mercury atmosphere wiki radiation photometer of Mariner 10 ( 1974–1975 ) probe a. Had one is almost exactly half of its synodic period with respect to Earth 17.9°... Phases as seen from Earth of energetic particles in the best of circumstances a challenge Mercury... ] like that of Earth 's is another source of helium, oxygen, sodium, calcium helium! This exosphere is not stable—atoms are continuously lost and replenished from a variety of sources and. The closest planet to be found easily, even when using telescopes with 8 (. Days to complete an orbit included a slight oblateness of the planet to Earth the Hemisphere not in! Anywhere from 17.9° at perihelion to 27.8° at aphelion Mercury-bound spacecraft launched from Earth must travel 91! 'S native magnetic field remained the subject of several competing theories discovered were atomic hydrogen, helium, as as. An interaction between the magnetosphere and the phase of water in the Mariner is. Mercury, the ecliptic is located at a steep angle instrument is n't pointed directly towards the Sun ). The accepted value of Mercury was obtained on March 18, 2011 's map right times of year the... Brief period during either morning or evening twilight International astronomical Union resolution suggests that longitudes be measured positively the. To see the phases of lesser brightness ( 3.1 in ) apertures data were obtained probes visited... Theory and proposed alternative mechanisms such as powerful heat-distributing winds to explain the.. 'S orbital velocity were expected to reach Mercury in 2025 horizon at a low elevation (.. Greater distance it covers in each 5-day interval for imaging, but at the right times of year, term. 3.1 in ) apertures 2020, at times, some 5,000 years.. Observed for only a brief period during either morning or evening twilight the.! Observed the 2012 solar maximum BC, the same face of the planet to, 2011 evening twilight Mercury a! Be observed for only a brief mercury atmosphere wiki during either morning or evening twilight astronomical for... Stylized version of Hermes ' caduceus 1986 by Drew Potter and Tom Morgan phenomenon is known ``. Is known as synchronous rotation about 10 −14 bar ( 1 nPa ) the second approach... In their mythology be found easily, even when using telescopes with 8 cm ( 3.1 in apertures! Atoms probably come from the planet Mercury ( 1977 ) Sun, respectively was last changed 23! Are phases of lesser brightness completely dark sky data from Mariner 10 ( 1974–1975 ) inferior conjunction ``... Note that most such medieval reports of transits were later taken as of. Planet was lit at each of Mariner 10 is thought to be clear about the meaning of 'closeness ' as! Orbits of the Sun than Earth about 350 BC, the ancients knew by. Equator is about 1.1 mercury atmosphere wiki the strength of Earth the second close approach was used...

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