69230 Hermes is an Apollo, Mars- and Venus-crosser asteroid that passed within 0.005 AU of the Earth (approximately 1.9 times the distance of the Moon) on October 30, 1937. Karl Wilhelm Reinmuth (April 4, 1892 – May 6, 1979) was a German astronomer. ... October 28 is the 301st day of the year (302nd in leap years) in the Gregorian Calendar, with 64 days remaining. ... 1937 (MCMXXXVII) was a common year starting on Friday (link will take you to calendar). ... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge... Minor planets, or planetoids are minor bodies of the Solar system orbiting the Sun (or of other planetary systems orbiting other stars) that are larger than meteoroids (the largest of which might be taken to be around 10 meters or so across) but smaller than major planets (Mercury having a... The Apollo asteroid 25143 Itokawa. ... A Mars-crosser asteroid is an asteroid whose orbit crosses that of Mars. ... A Venus-crosser asteroid is an asteroid whose orbit crosses that of Venus. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... November 26 is the 330th day (331st on leap years) of the year in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... The Julian day or Julian day number (JDN) is the number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar . ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... giga- (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... The metre, or meter, is a measure of length. ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... A day (symbol: d) is a unit of time equal to 24 hours. ... In astronomy, a Julian year is a unit of time defined as exactly 365. ... The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more massive body. ... Look up second in Wiktionary, the free dictionary. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1／360 of a full rotation. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... For the majority of numbered asteroids, almost nothing is known apart from a few physical parameters. ... Mass is a property of a physical object that quantifies the amount of matter it contains. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... Gravity is a force of attraction that acts between bodies that have mass. ... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Asteroids are assigned a type based on spectral shape, color, and sometimes albedo. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us. ... Albedo is the measure of reflectivity of a surface or body. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... The Apollo asteroid 25143 Itokawa. ... A Mars-crosser asteroid is an asteroid whose orbit crosses that of Mars. ... A Venus-crosser asteroid is an asteroid whose orbit crosses that of Venus. ... The astronomical unit (AU or au or a. ... Earth is the third planet in the Solar system. ... Bulk composition of the moons mantle and crust estimated, weight percent Oxygen 42. ... October 30 is the 303rd day of the year (304th in leap years) in the Gregorian Calendar, with 62 days remaining. ... 1937 (MCMXXXVII) was a common year starting on Friday (link will take you to calendar). ...

At the time, this was the closest known approach of an asteroid to the Earth. Not until 1989 was a closer approach observed (by 4581 Asclepius). At closest approach, Hermes was moving 5° per hour across the sky and reached 8th magnitude. An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... 1989 (MCMLXXXIX) was a common year starting on Sunday of the Gregorian calendar. ... 4581 Asclepius is a small asteroid of the Apollo group that can approach Earth’s orbit to within 600,000 km; it was discovered in 1989 by the American astronomers Henry E. Holt (1929-) and Norman G. Thomas (1930-). Asclepius (1989 FC) passed by the Earth on March 22, 1989... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ...

It was discovered by Karl Reinmuth in images taken on October 28, 1937. Only five days of observations could be made before Hermes became too faint to be seen in the telescopes of the day. This was not enough to calculate an orbit, and Hermes was "lost". It thus did not receive a number, but Reinmuth nevertheless named it after the greek god Hermes. It was the only unnumbered but named asteroid, having only the provisional designation 1937 UB. Karl Wilhelm Reinmuth (April 4, 1892 – May 6, 1979) was a German astronomer. ... October 28 is the 301st day of the year (302nd in leap years) in the Gregorian Calendar, with 64 days remaining. ... 1937 (MCMXXXVII) was a common year starting on Friday (link will take you to calendar). ... Hermes bearing the infant Dionysus, by Praxiteles Hermes (Greek IPA ), in Greek mythology, is the god of boundaries and of the travelers who cross them, of shepherds and cowherds, of orators, literature and poets, of athletics, of weights and measures and invention and commerce in general, of liars, and of...

On October 15, 2003, Brian A. Skiff of the LONEOS project made an asteroid observation that, when the orbit was calculated backwards in time (by Timothy B. Spahr, Steven Chesley and Paul Chodas), turned out to be a rediscovery of Hermes. The orbit is now well known, and Hermes has been assigned sequential number 69230. In retrospect it turned out that Hermes came even closer to the Earth in 1942 than in 1937, within 1.7 Moon distances without being observed. October 15 is the 288th day of the year (289th in Leap years). ... 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... Brian A. Skiff is an American astronomer. ... Lowell Observatory Near-Earth-Object Search (LONEOS) is a program run by NASA and Lowell Observatory to discover near-Earth objects. ... Timothy B. Spahr is an American astronomer. ... This article is about the year. ...

Hermes is an S-type asteroid, a classification first reported by Andy Rivkin and Rick Binzel. Radar observations led by Jean-Luc Margot at Arecibo Observatory and Goldstone in October and November of 2003 showed Hermes to be a binary asteroid. The primary and secondary components have nearly identical radii of about 300 m, and their orbital separation is only 1200 m. Approximately 17% of all known asteroids are of an S-type (for stony) composition. ... Jean-Luc Margot is a Belgian astronomer and an Assistant Professor at Cornell University. ... The Arecibo Observatory is located in Arecibo, Puerto Rico on the north coast of the island. ... Goldstone may refer to: goldstone, a gemstone simulant Goldstone Deep Space Communications Complex, a network of radio antennas in Californias Mojave Desert (USA). ... The term binary asteroid refers to a system in which two asteroids orbit their common centre of gravity, in analogy with binary stars. ...

External link

• Arecibo 2003 press release
• Hermes radar results at Cornell University

… | Previous minor planet | 69230 Hermes | Next minor planet | …