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Topic: List of solar system objects by radius

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In the News (Tue 16 Apr 19)

  List of Solar system objects by radius - Wikipedia, the free encyclopedia
For mostly spherical objects (oblate) such as planets and large planetoids, the equatorial radius is used.
While their radius remains provisional due to the recency of discovery, and is generally expressed as a range, the approximate locations in this list are shown.
Sol system objects arranged by diameter in metres.
en.wikipedia.org /wiki/Solar_system_by_size   (247 words)

 CalendarHome.com - Solar system - Calendar Encyclopedia
In the outer regions of this solar nebula, ice and volatile gases were able to survive, and as a result, the inner planets are rocky and the outer planets were massive enough to attract large amounts of lighter gases, such as hydrogen and helium.
Asteroids are objects smaller than planets that mostly occupy the orbit between Mars and Jupiter, between 2.3 and 3.3 AU from the Sun, and are composed in significant part of non-volatile minerals.
The point at which the solar system ends and interstellar space begins is not precisely defined, since its outer boundaries are delineated by two separate forces: the solar wind and the Sun's gravity.
encyclopedia.calendarhome.com /Solar_system.htm   (4838 words)

 The Solar System   (Site not responding. Last check: 2007-10-09)
Nearby objects outside the solar system are known as stellar neighbors; the nearest one is a red dwarf star called Proxima Centauri about 4.3 light years away.
The solar magnetic field is the dominating magnetic field throughout the interplanetary regions of the solar system, except in the immediate environment of planets which have their own magnetic fields.
The terrestrial planets are the four innermost planets in the solar system, Mercury, Venus, Earth and Mars.
www.pgd.hawaii.edu /eschool/solar_system/The_Solar_System.htm   (1057 words)

 Sacramento Peak: Glossary   (Site not responding. Last check: 2007-10-09)
The "objects" in the "system" may be anything at all: atoms in the Earth, or planets and the Sun in the Solar System, or stars in a galaxy.
For an object orbiting around a much heavier object (such as a planet or spacecraft around the Sun, or a moon or spacecraft around a planet), the semimajor axis of the orbit is equal to the average of the smallest and the largest distance between the light and the heavy objects.
Solar flares are "explosions" (violent events) on the Sun in which tension in the magnetic field is released, which generates a lot of energy that heats up material and shoots it into outer space.
www.sunspot.noao.edu /PR/glossary.html   (9467 words)

 Nat' Academies Press, Exploring the Trans-Neptunian Solar System (1998)
As a class, the trans-neptunian objects are primitive compared with inner solar system objects, but they do show evidence for diversity9 and for evolutionary processes having occurred.10 These newly discovered objects and their relationships represent a fertile, relatively unexplored region for investigation of fundamental questions on the origin and evolution of the solar system.
Comets and the trans-neptunian objects are the relics of bodies in the outer solar system that failed to be incorporated into the giant planets during the runaway growth of their cores.
Trans-neptunian objects may have tenuous atmospheres because the cold temperatures in the outer solar system permit the existence of volatile ices on the surfaces.
www.nap.edu /books/0309060419/html/7.html   (6432 words)

Kuiper belt objects are minor planets, so the question arose as to whether to consider Pluto to be one too.
Some agree that an astronomical object more than about 360 km in diameter, at which point the object has a tendency to become round under its own gravity, should be known as a planet.
On July 29, 2005, a Trans-Neptunian object called 2003 UB313 was announced, along with the claim that it is at least as large as Pluto, and estimated to be half again larger.
www.crystalinks.com /pluto.html   (3405 words)

 [sci.astro] Solar System (Astronomy Frequently Asked Questions) (5/9)   (Site not responding. Last check: 2007-10-09)
Subject: E.03 What is the "Solar Neutrino Problem?" Author: Bruce Scott TOK , Joseph Lazio A middle-aged main-sequence star like the Sun is in a slowly-evolving equilibrium, in which pressure exerted by the hot gas balances the self-gravity of the gas mass.
Collisions between objects in such a disk and gravitational tugs from the gas giants in our solar system would be enough to cause some of the objects to fall into the inner solar system occasionally where we would see them.
Some objects would have had their orbits changed so that they impacted with one of the planets (like Comet Shoemaker-Levy 9 did in 1994); some objects would be ejected from the solar system entirely; and some objects would be kicked into very large orbits and into the Oort cloud.
www.faqs.org /faqs/astronomy/faq/part5   (11199 words)

 Pluto (planet) - Biocrawler definition:Pluto (planet) - Biocrawler   (Site not responding. Last check: 2007-10-09)
Because Pluto is also the smallest planet in our solar system and has a highly eccentric orbit (which takes it inside the orbit of Neptune) there has been some debate regarding whether Pluto should be classified as a planet (see below for details).
In the matter of Pluto the discretion of naming the new object belonged to Lowell Observatory and its director, Slipher, who, in the words of Tombaugh, was "urged to suggest a name for the new planet before someone else did".
Sedna could be the largest object yet discovered in the solar system since Pluto in 1930.
www.biocrawler.com /biowiki/Pluto_(planet)   (3194 words)

 Solar System Extrema   (Site not responding. Last check: 2007-10-09)
Here are listed the largest, brightest and densest of the major bodies in the solar system and those with best prospects for life.
There are 17 bodies in the solar system whose radius is greater than 1000 km.
This composite shows Earth and the remaining 11 large solar system objects at a scale of 100 km/pixel.
seds.lpl.arizona.edu /nineplanets/nineplanets/datamax.html   (429 words)

Objects with a radius less than 95.5 km (down to 8 km) need to be placed in a fifth group, left to the minor one, which is not shown in the table.
Estimated volumetric mean radius of a theoretically exploded planet between Mars and Jupiter, based on the calculated total mass and weighted mean density of the asteroid belt objects, is about 580 km.
The two miniature satellites of Mars are among the smallest objects of the solar system, and it is highly possible that these could be captured by Mars during a late period of the solar system formation.
www.tenspheres.com /researches/radius.htm   (2865 words)

What's more, the Sun is orbiting very close to the "corotation radius" of the galaxy, where the angular speed of the galaxy's spiral arms (see chart from Astronomy: The Cosmic Journey by William K. Hartmann and Chris Impey) matches that of the stars within.
Known as Herbig-Haro objects since their discovery in the early 1950s, these lobes typically extend a few light-years in length, have masses similar or larger than the developing star itself, and are moving apart at speeds of tens to a few hundred kilometers (several to tens of miles) per second.
Hence, either the object formed independently from fragmentation of the original Solar nebula, or the object was ejected from another star system and subsequently captured by Sol.
www.solstation.com /stars/sol.htm   (3055 words)

 Planetary Formation and Our Solar System
A brief discussion however of one consequence of the magnetic field interactions in the early Solar System will help to explain characteristic 5, the fact that most of the angular momentum of the Solar System is contained in the planets, not the Sun.
Now, to recap, we are at a stage where the Solar System consists of a newly formed protosun surrounded by a flat, rotating nebular disk of dust and gas.
This roughly explains the increase in mean density at the edge of the Solar System, although this effect alone may not be large enough to explain the high density of Pluto.
www.dtm.ciw.edu /akir/Seminar/seminar.html   (3136 words)

 Solar Orbits
Every hour, the system calculates and sums the gravitation acceleration vectors for all the bodies in the solar system, handles any collisions, and moves all the bodies at once.
This object is essentially a dynamic array of vectors and methods that calculate each gravitational interaction, resolve a single sum vector from a row of vectors, and detect collisions.
The starting conditions were the mass and radius of the Sun and the mass, radius, initial position, and initial velocity for each of the nine planets as determined from data from research and calculation.
www.css.tayloru.edu /~jcoombs/proj/modsim/so/master.htm   (6148 words)

 NOVAS   (Site not responding. Last check: 2007-10-09)
Objects within and outside the solar system are treated similarly and the position vectors formed and operated on by these routines place each relevant object at its actual distance (in AU) from the solar system barycenter.
Objects at unknown distance (parallax zero or undetermined) are placed on the "celestial sphere" herein defined to be at a radius of 10 megaparsecs (2.06E12 AU).
Similarly, there are a number of versions of the subroutine which supplies information on the positions of solar system bodies.
aa.usno.navy.mil /software/novas/novas_info.html   (548 words)

 Asteroid Introduction
Asteroids are rocky and metallic objects that orbit the Sun but are too small to be considered planets.
In fact, if the estimated total mass of all asteroids was gathered into a single object, the object would be less than 1,500 kilometers (932 miles) across -- less than half the diameter of our Moon.
Because asteroids are material from the very early solar system, scientists are interested in their composition.
www.solarviews.com /eng/asteroid.htm   (543 words)

 National Institute for Discovery Science: The Reenchantment of the Solar System: A Proposed Search for Local ET’s
The originating star systems for these advanced beings could be solar-type stars that fortuitously approach our Sun within a light year or so at intervals of about a million years or nearby stars that have left the main sequence, prompting interstellar migration.
The solar system was enchanted by the presence of those gods and goddesses of the ancient pantheon — called Mercury, Venus, Mars, Jupiter, and Saturn by citizens of the Roman world.
Stars in the solar vicinity are next examined to attempt to determine the frequency of post-main-sequence stars from which interstellar migration may be occurring.
www.nidsci.org /essaycomp/gmatloff.html   (8284 words)

 Alachua Astronomy Club: Solar System Walk Table
This allows the solar system from the Sun to Pluto to fit within a 0.9 mile piece of N.W. 8 Avenue, the approximate distance from N.W. 34 Street to N.W. 23 Street, an almost level, straight stretch of road.
For Moon and Charon, scaled orbit radius is this column is in millimeters.
Object diameters are equatorial diameters; for Jovian planets, diameters are at 1 bar pressure (101.325 kPa).
www.floridastars.org /sstable.html   (223 words)

 Introduction and FAQ   (Site not responding. Last check: 2007-10-09)
There are also a few miscellaneous pages: on planetary science spacecraft, the glossary, a list of some of the planetary images available elsewhere on the Net, some bits of history, several pages of data and a special plea for your support of the space program.
As far as our own solar system is concerned there are good historical reasons to just define "planet" as "one of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto".
But even the largest ones must be small compared to the radius of the planet (the height of tallest mountain in the solar system, Olympus Mons on Mars, is less than 1% of Mars's radius).
seds.lpl.arizona.edu /nineplanets/nineplanets/intro.html   (2307 words)

 Losmandy goto specs
The Losmandy Gemini system is a DC servo motor based GOTO computerized positioning system designed for the Losmandy HGM200, G-11 and G-8 mounts.
The Gemini system has many features designed to quickly and accurately point the telescope to an object, then track it with even higher precision than the previous digital stepper drive used by Losmandy.
The object may be close to a east or west limit, where it will slew the last few degrees in centering mode.
www.losmandy.com /losmandygoto/gotospecs.html   (1544 words)

 Solar System   (Site not responding. Last check: 2007-10-09)
The result is the relative distance of each object from the Sun, to a surprising degree of accuracy!
There is a lot of debris in the solar system, including meteoroids, asteroids and comets.
Most comets spend their time in the outer Solar System, making it difficult to distinguish them from normal asteroids.
earthsci.org /space/solsys/solsys.html   (384 words)

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