|
121 Hermione
Hermione (minor planet designation: 121 Hermione) is a very large binary asteroid discovered in 1872. It orbits in the Cybele group in the far outer asteroid belt. As an asteroid of the dark C spectral type, it is probably composed of carbonaceous materials. In 2002, a small moon was found to be orbiting Hermione. Discovery Hermione was discovered by J. C. Watson on 12 May 1872 from Ann Arbor, Michigan, in the United States, and named after Hermione, daughter of Menelaus and Helen in Greek mythology. Physical properties left, Lightcurve-based 3D-model of Hermione The asteroid has a bi-lobed shape, as evidenced by adaptive optics images, the first of which were taken in December 2003 with the Keck telescope. Of several proposed shape models that agreed with the images, a "snowman"-like shape was found to best fit the observed precession rate of Hermione's satellite. In this "snowman" model, the asteroid's shape can be approximated by two partially overlapping spheres of r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Craig Watson
James Craig Watson (January 28, 1838 – November 22, 1880) was a Canadian-American astronomer, discoverer of comets and minor planets, director of the University of Michigan's Detroit Observatory in Ann Arbor, and awarded with the Lalande Prize in 1869. Biography Watson was born in the village of Fingal, Ontario Canada. His family relocated to Ann Arbor, Michigan in 1850. At age 15 he was matriculated at the University of Michigan, where he studied the classical languages. He graduated with a BA in 1857 and received a master's degree on examination after two years' study in astronomy under professor Franz Brünnow. He became Professor of Physics and instructor in Mathematics, and in 1863, succeeded him as professor of Astronomy and director of the Detroit Observatory. He wrote the textboo''Theoretical Astronomy'' published in 1868 by J. B. Lippincott & Co. The textbook was a standard reference work for over thirty years. He discovered 22 asteroids, beginning with 79 Euryno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helen Of Troy
Helen of Troy, Helen, Helena, (Ancient Greek: Ἑλένη ''Helénē'', ) also known as beautiful Helen, Helen of Argos, or Helen of Sparta, was a figure in Greek mythology said to have been the most beautiful woman in the world. She was believed to have been the daughter of Zeus and Leda, and was the sister of Clytemnestra, Castor and Pollux, Philonoe, Phoebe and Timandra. She was married to King Menelaus of Sparta "who became by her the father of Hermione, and, according to others, of Nicostratus also." The usual tradition is that after the goddess Aphrodite promised her to Paris in the Judgement of Paris, she was seduced by him and carried off to Troy. This resulted in the Trojan War when the Achaeans set out to reclaim her. Another ancient tradition, told by Stesichorus, tells of how "not she, but her wraith only, had passed to Troy, while she was borne by the Gods to the land of Egypt, and there remained until the day when her lord Menelaus, turning aside on the h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discoveries By James Craig Watson
Discoveries may refer to: Music * ''Discoveries'' (Cannonball Adderley album), 1955 * ''Discoveries'' (Josh Nelson album), 2011 * ''Discoveries'' (Northlane album), 2011 Other uses * ''Discoveries'' (film), a 1939 British film * Discoveries (horse), a racehorse * ''Discoveries'' (Robertson Davies), a 2002 book by Robertson Davies * ''Discoveries'' (TV series), a Canadian youth science television series which aired on CBC Television in 1957 * ''Abrams Discoveries'', a series of illustrated non-fiction books published by Harry N. Abrams * ''Discoveries'', a work by William Butler Yeats, written in 1907 * ''Discoveries'', a magazine published by Cedars-Sinai Medical Center See also * Age of Discoveries * Discovery (other) Discovery may refer to: * Discovery (observation), observing or finding something unknown * Discovery (fiction), a character's learning something unknown * Discovery (law), a process in courts of law relating to evidence Discovery, The Discov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cybele Asteroids
The Cybele asteroids (also known as the "Cybeles") are a dynamical group of asteroids, named after the asteroid 65 Cybele. Considered by some as the last outpost of an extended asteroid belt, the group consists of just over 2000 members and a few collisional families. The Cybeles are in a 7:4 orbital resonance with Jupiter. Their orbit is defined by an osculating semi-major axis of 3.28 to 3.70 AU, with an eccentricity of less than 0.3, and an inclination less than 25°. The dynamical Cybele group is located adjacent to the outermost asteroid belt, beyond the Hecuba gap – the 2:1 resonant zone with Jupiter, where the Griqua asteroids are located – and inside the orbital region of the Hilda asteroids (3:2 resonance), which are themselves followed by the Jupiter trojans (1:1 resonance) further out. Description Three known asteroid families exist within the Cybele group: the Sylvia family ( 603), the Huberta family and the Ulla family ( 903). A potential f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jet Propulsion Laboratory
The Jet Propulsion Laboratory (JPL) is a federally funded research and development center and NASA field center in the City of La Cañada Flintridge, California, United States. Founded in the 1930s by Caltech researchers, JPL is owned by NASA and managed by the nearby California Institute of Technology (Caltech). The laboratory's primary function is the construction and operation of planetary robotic spacecraft, though it also conducts Earth-orbit and astronomy missions. It is also responsible for operating the NASA Deep Space Network. Among the laboratory's major active projects are the Mars 2020 mission, which includes the '' Perseverance'' rover and the '' Ingenuity'' Mars helicopter; the Mars Science Laboratory mission, including the ''Curiosity'' rover; the InSight lander (''Interior Exploration using Seismic Investigations, Geodesy and Heat Transport''); the ''Mars Reconnaissance Orbiter''; the '' Juno'' spacecraft orbiting Jupiter; the ''SMAP'' satellite for earth surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marquis De Lafayette
Marie-Joseph Paul Yves Roch Gilbert du Motier, Marquis de La Fayette (6 September 1757 – 20 May 1834), known in the United States as Lafayette (, ), was a French aristocrat, freemason and military officer who fought in the American Revolutionary War, commanding American troops in several battles, including the siege of Yorktown. After returning to France, he was a key figure in the French Revolution of 1789 and the July Revolution of 1830. He has been considered a national hero in both countries. Lafayette was born into a wealthy land-owning family in Chavaniac in the province of Auvergne in south central France. He followed the family's martial tradition and was commissioned an officer at age 13. He became convinced that the American revolutionary cause was noble, and he traveled to the New World seeking glory in it. He was made a major general at age 19, but he was initially not given American troops to command. He was wounded during the Battle of Brandywine but still man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Frigate Hermione (1779)
''Hermione'' was a 32-gun of the French Navy. Designed for speed, she was one of the first ships of the French Navy to receive a copper sheathing. At the beginning of the Anglo-French War of 1778, she patrolled in the Bay of Biscay, escorting convoys and chasing privateers. She became famous when she ferried General La Fayette to the United States in 1780 in support of the rebels in the American Revolutionary War. She took an incidental role in the Battle of Cape Henry on 16 March 1781, and a major one in the action of 21 July 1781. ''Hermione'' grounded and was wrecked in 1793. In 1997, construction of a replica ship started in Rochefort, Charente-Maritime, France; the new ship is likewise named . Construction Construction of ''Hermione'' started in December 1778 at Rochefort, under Chevillard brothers. She was launched on 28 April 1779, and commissioned on 11 May, with 5 month worth of food and 66 barrels of fresh water, under Lieutenant Latouche-Tréville Shortage of ade ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Occultation
An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks from view (occults) an object in the background. In this general sense, occultation applies to the visual scene observed from low-flying aircraft (or computer-generated imagery) when foreground objects obscure distant objects dynamically, as the scene changes over time. If the closer body does not entirely conceal the farther one, the event is called a '' transit''. Both transit and occultation may be referred to generally as ''occlusion''; and if a shadow is cast onto the observer, it is called an eclipse. The symbol for an occultation, and especially a solar eclipse, is file:Occultation symbol.svg (U+1F775 🝵). Occultations by the Moon The term occultation is most frequently used to describe lunar occultations, those relati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rubble Pile
In astronomy, a rubble pile is a celestial body that is not a monolith, consisting instead of numerous pieces of rock that have coalesced under the influence of gravity. Rubble piles have low density because there are large cavities between the various chunks that make them up. The asteroids Bennu and Ryugu have a measured bulk density which suggests a rubble pile internal structure. Many comets and most smaller minor planets (<10 km in diameter) are thought to be composed of coalesced rubble. Minor planets 
Most smaller s are thought to be rubble piles.
Rubble piles form wh ...
[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellipsoid
An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a surface that may be defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, an ellipsoid is characterized by either of the two following properties. Every planar cross section is either an ellipse, or is empty, or is reduced to a single point (this explains the name, meaning "ellipse-like"). It is bounded, which means that it may be enclosed in a sufficiently large sphere. An ellipsoid has three pairwise perpendicular axes of symmetry which intersect at a center of symmetry, called the center of the ellipsoid. The line segments that are delimited on the axes of symmetry by the ellipsoid are called the ''principal axes'', or simply axes of the ellipsoid. If the three axes have different lengths, the figure is a triaxial elli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precession
Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself. In other words, if the axis of rotation of a body is itself rotating about a second axis, that body is said to be precessing about the second axis. A motion in which the second Euler angle changes is called '' nutation''. In physics, there are two types of precession: torque-free and torque-induced. In astronomy, ''precession'' refers to any of several slow changes in an astronomical body's rotational or orbital parameters. An important example is the steady change in the orientation of the axis of rotation of the Earth, known as the precession of the equinoxes. Torque-free Torque-free precession implies that no external moment (torque) is applied to the body. In torque-free precession, the angular momentum is a constant, but the angular veloci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keck Telescope
The W. M. Keck Observatory is an astronomical observatory with two telescopes at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ... of Hawaii. Both telescopes have aperture primary mirrors, and when completed in 1993 (Keck 1) and 1996 (Keck 2) were the List of largest optical reflecting telescopes, largest astronomical telescopes in the world. They are currently the 3rd and 4th largest. Overview With a concept first proposed in 1977, telescope designers at the University of California, Berkeley (Terry Mast) and Lawrence Berkeley Laboratory (Jerry Nelson (astronomer), Jerry Nelson) had been developing the technology necessary to build a large, ground-based telescope. With a design in h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> French Frigate Hermione (1779)")
