The Nysa asteroids (also known as the Hertha family or the Polana family) are a group of asteroids in the Main Belt orbiting the sun between 2.41 and 2.5 AU. Asteroids in this family have eccentricities between 0.12 and 0.21 and inclinations of 1.4 to 4.3.[1] The family derives it's name from its most massive member, 44 Nysa. The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... The Sun is the star at the center of the Solar System. ... The astronomical unit (AU or au or a. ... Look up Eccentricity in Wiktionary, the free dictionary. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... 44 Nysa (IPA: ) is a quite large and very bright main belt asteroid. ...
Subgroups
Asteroids in the Nysa family are typically divided into two, mineralogically different subgroups: Nysa and Polana. Aside from 44 Nysa and 135 Hertha, asteroids in the Nysa subgroup are S-type asteroids. Asteroids in the Polana subgroup, like 142 Polana, are F-type asteroids. [2] Approximately 17% of all known asteroids are of an S-type (for stony) composition. ... F-type asteroid is a subdivision of C-type asteroids distinguished spectrally by differences in the ultraviolet absorption and the lack of a water absorption feature at 3 micrometres. ...
[3] In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... 44 Nysa (IPA: ) is a quite large and very bright main belt asteroid. ... 135 Hertha is a metal-rich, quite large main belt asteroid. ... 750 Oskar 750 Oskar is a minor planet orbiting Sun. ... 2984 Chaucer is a small main belt asteroid, which was discovered by Edward L. G. Bowell in 1981. ... 142 Polana is a very dark Main belt asteroid. ... 3467 Bernheim is an asteroid. ...
Vulcanoids ·Near-Earth asteroids ·Main belt ·Jupiter Trojans ·Centaurs ·Damocloids ·Comets ·Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud) A small solar system body is a term defined in 2006 by the International Astronomical Union to describe solar system objects which are not planets or dwarf planets: [1] Therefore it refers to these objects that can be further classified based on their orbit or composition: all known minor planets... Vulcanoids are hypothetical asteroids that may orbit in a dynamically stable zone between 0. ... Near-Earth asteroids (NEAs) are asteroids whose orbits are close to Earths orbit. ... Image of the main asteroid belt between the orbits of Mars and Jupiter. ... Image of the Trojan asteroids in front of and behind Jupiter along its orbital path. ... The centaurs are a class of icy planetoids that orbit the Sun between Jupiter and Neptune, named after the mythical race of centaurs. ... Damocloids are asteroids such as 5335 Damocles and 1996 PW that have long-period highly eccentric orbits typical of periodic comets such as 1P/Halley, but without showing a cometary coma or tail. ... Comet Hale-Bopp Comet McNaught as seen from Swifts Creek, Victoria, Australia on 23 January 2007 A comet is a small body in the solar system that orbits the Sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail — both primarily from the effects of... A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... Artists rendering of the Kuiper Belt and hypothetical more distant Oort cloud. ... The scattered disc (or scattered disk) is a distant region of our solar system, thinly populated by icy planetoids known as scattered disk objects (SDOs), a subset of the broader family of trans-Neptunian objects (TNOs). ... This image is an artists rendering of the Oort cloud and the Kuiper Belt. ...
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System. For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. 243 Ida and its moon Dactyl An asteroid moon is an asteroid that orbits another asteroid. ... Major features of the Solar System (not to scale, from left to right): Pluto, Neptune, Uranus, Saturn, Jupiter, the asteroid belt, the Sun, Mercury, Venus, Earth & Moon, and Mars. ... This is a list of numbered minor planets, nearly all of them asteroids, in sequential order. ... This page alphabetically lists the first thousand asteroids to be numbered, which are mostly in the main belt. ... This is a list of named asteroids, with links to the Wikipedia articles on the people, places, characters and concepts that they are named after. ...
Its members move in low-inclination orbits at a mean distance from the Sun of 2.4 to 2.5 AU, a region of the belt showing an unusual abundance of the fairly rare F-class asteroids.
The two largest members of the family are 44 Nysa (the largest E-class asteroid and the brightest asteroid known) and 135 Hertha.
Evidence suggests that the family is actually made of two distinct groupings: the first consisting of dark asteroids, including several F-type members, headed by its least-numbered member, 142 Polana.
The difficulty in assessing whether the Nysafamily can be considered as a unique group or as the result of the merging of two independent families, has long prevented from undertaking systematic physical analyses of this important family.
Moreover, it is known that in the region of the belt surrounding the family, there is an unusual concentration of F-type asteroids.
In particular, members of the Nysa subgroup tend to be S-type objects (with the exceptions of Nysa itself, an E-type object, and Hertha, an M-type asteroid), whereas the Polana subgroup is mostly composed of F-type objects.
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