M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

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• Orbital Properties of the Solar System

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

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• Co-orbital asteroids
• Inner Solar System Animation
• Near Earth Object Maps

... Although the major planets get the most press, a swarm of rocks, comets, and asteroids also exist. ... The light blue lines indicate the orbits of planets . ... The red dots indicate asteroids that come within 1.3 Earth-Sun distances ( AU ) of the Sun and so pose an increased (although small) collision risk with the Earth . Comets appear as dark blue squares, while dark blue points are Jupiter Trojans , asteroids that orbit just ahead of, or just behind Jupiter. ... Asteroids Near Earth . ...

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• XWare > APOD
• Journal "Peremennye Zvezdy"

In 1950 Jan Oort noticed that . no comet has been observed with an orbit that indicates that it came from interstellar space, . ... From this he proposed that comets reside in a vast cloud at the outer reaches of the solar system. ... Unfortunately, since the individual comets are so small and at such large distances, we have no direct evidence about the Oort Cloud. ... Its orbit is intermediate between the Kuiper Belt and what was previously thought to be the inner part of the Oort Cloud. ...

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• APOD: 2002 July 24 - Our Busy Solar System
• APOD: 2006 March 19 - Our Busy Solar System
• Jupiter's Inner Moons

... no comet has been observed with an orbit that indicates that it came from interstellar space, . ... From this he proposed that comets reside in a vast cloud at the outer reaches of the solar system. ... Unfortunately, since the individual comets are so small and at such large distances, we have no direct evidence about the Oort Cloud. ... T he Kuiper Belt is a disk-shaped region past the orbit of Neptune roughly 30 to 100 AU from the Sun containing many small icy bodies. ... Small Bodies .. ...

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• SmallBodies in the Solar System
• An Overview of the Solar System
• Amalthea

The basic problems of the Laboratory are connected with researches of dynamics of minor planets and comets. ... THE ORBIT IMPROVEMENT of minor planets from optical and radar observations, . the utilization of minor planet observations for THE DETERMINATION OF ORIENTATION OF STAR CATALOGUES and DETERMINATION OF MASSES OF MINOR PLANETS BY DYNAMICAL METHOD, . THE ESTIMATION OF COLLISION PROBABILITY of minor planets with other bodies and with each other, . ...

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• (Untitled)

... The awsome spectacle of a brilliant comet, with its long ghostly tail streaming behind it, is a rare event. ... Only one other comet, Comet Halley, was seen so far from the Sun, giving scientists an opportunity to watch it as it slowly warmed up and sprouted a tail. ... Comets are the Rip Van Winkles of the solar system -- mini-worlds that have changed little during their 4.5-billion-year nap far from the Sun. ... Observing Comets . ... Once, comets inhabited the entire solar system. ...

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• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: Guest Observer
• ASP: Planet-Building on the Grandest Scales

... By admin May 20, 2013 Posted in: Comets and Asteroids . ... One asteroid with a suitably menacing name and an equally threatening demeanor is the asteroid 99942, Apophis, discovered in 2004.€а Named after the ancient Egyptian god€а of darkness and chaos, this asteroid€а sought fame as it had promised to live up to its name and plunge the Earth into turmoil as its orbit brought it straight in line with a head-on collision with the Earth in 2036. ... The new postponed doomsday date was April 13 th...

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• The Mystery Object of M82 | Astronotes
• Rings Around an Asteroid | Astronotes
• V774104: a Dark World Putting a New Light on the Solar System? | Astronotes

Comets necessarily obey the same physical laws as every other object. ... If one considers only two bodies -- either the Sun and a planet, or the Sun and a comet -- the smaller body appears to follow an elliptical path or orbit about the Sun, which is at one focus of the ellipse. ... Another quantity that is conserved is called angular momentum. ... Comets simply are bodies which in general have more angular momentum per unit mass than do planets and therefore move in more elongated orbits. ...

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• Space History Introduction
• Kuiper Belt Objects
• Hubble Finds Oxygen Atmosphere On Jupiter's Moon Europa

... Among these objects, the newly discovered Kuiper Belt Objects (KBO's) outside the orbit of planet Neptune (also known as Trans-Neptunian Objects) are of particular interest, but the meeting was also concerned with distant comets and some of the small moons of the outer planets. ... The Kuiper Belt is a zone outside the orbits of Neptune and Pluto in which icy solar system objects were expected to be present; the first was found in 1992. ... ESO Press Photo 41/98 . ... Send comments to <ips@eso.org> ...

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• Aleksandar Cikota
• High Resolution HST Images of Pluto and Charon (ESO Press Release 09/94)
• Comet Halley

... Bad Astronomy . ... This page has images and links that George Noory and I discussed on the Coast to Coast AM radio show on Friday night, July 29, 2005. ... Two new objects were announced today, and both are big, maybe as big as Pluto. One is almost certainly bigger than Pluto! ... I've been saying for years that we will almost certainly find something bigger than Pluto out there in the dark, cold reaches of our solar system (I've said so on Coast to Coast several times, actually). ...

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• Phil Plait's Bad Astronomy: Bitesize Tour of the Solar System
• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Misconceptions: The Planet X Arguments in a...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... The Magazine . ... Observing . ... Magazine . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Why do the outer planets have more moons than the inner planets? ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

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• Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets,
• Can you explain Mercury's retrograde motion? Do other planets appear to do this
• Planets, orbits, and comets are somewhat round. Is there an underlying

... The function is accessible, if the file with the image is open, and Ю identification of a star field is made. ... a) Load a first image by the command " Open ", and others by the command " Open +". b) Make an identification of the field. c) Open the menu " File ", select " Next " or press . ... It is necessary tree or more images. a) Load the first image by the command " Open" , and others by the command " Open + ". b) Open the menu " Marking ", select "Detect moving objects" or press - . ...

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... Ever wonder how solar-mass stars form?. ... In order for material to accrete onto a protostar it has to lose angular momentum. The angular momentum of a large natal cloud leads to the formation of a circumstellar disk and inner accretion disk as the cloud collapses. ... Winds generated in the inner disk or close to the stellar surface (we don't know which) expel material along the disk rotation axis. ... This provides the highest resolution observational data on nearby young stars. ...

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• Siding Spring Survey
• Siding Spring Survey Follow-up Obs
• Siding Spring Survey 2003 XB22

Geotimes -- November 2005 -- Two more moons for "planet" Pluto http://www.geotimes.org/nov05/WebExtra110305.html Web Extra Thursday, November 3, 2005 Two more moons for Pluto When the New Horizons spacecraft finally reaches Pluto in July 2015, researchers will have more objects to study than previously thought. In addition to Pluto's confirmed moon Charon, astronomers have detected two more orbiting celestial bodies, which could help reveal how the planet and moon system formed. ...

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• The Birth of Stars: Herbig-Haro Jets, Accretion and Proto-Planetary Disks
• The Kepler Mission: A Photometric Mission to Determine the Frequency of Inner
• ST ScI Preprint #1390

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . LONEOS is a system designed to find Earth-crossing asteroids (ECAs) and comets (ECCs), collectively known as near-Earth objects (NEOs). ... Listed Since July 15, 1998 . ... Web Site . http://www.lowell.edu/users/elgb/loneos_disc.html . ... Web . www.astronomy.net . About Astronomy Net | ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Near Earth Object Program, AstroGuide Listing
• Astronomy articles, forums, listings, and other resources about Astronomy.

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

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• ADASS 2002 Conference Proceedings

Pulkovo NEO Page . ... EPOS Software Package . ... EPOS ( E phemeris P rogram for O bjects of the S olar system) is the Windows PC application for study and ephemeris support of observations of the Solar system objects. ... It controls the part of common data and transfers the control to one of the programs that solve the restricted set of tasks. ... So with the EPOS software package one can calculate the accurate ephemerides for many objects and get the quick illustration of their motion as well. ...

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• Pulkovo NEO Page: General Information

... Click on an object in the solar system or choose from the list at left to learn more . The Arecibo Observatory planetary radar is the world's most powerful instrument for post-discovery characterization and orbital refinement of near-Earth objects. ... The Solar System Studies group is a department of the Arecibo Observatory, which is an NSF facility operated under cooperative agreement by SRI International, Universities Space Research Association (USRA), and la Universidad Metropolitana (UMET). ...

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• Present Exploration of the Solar System
• The Pleiades
• Arecibo Radar Discovers Triple Near-Earth Asteroid

... The 209 candidates were selected from our first and second priority samples introduced in Paper IV. Of 169 first priority candidates, 141 objects appeared in our list as new ones. 28 objects were listed in the NED as galaxies or objects from various catalogs with known redshifts and some of them already had information on emission lines in earlier publications. ... The ``random selected sample'' was created to access the fraction of BCGs in the second priority list and contains 43 objects. ...

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• Moving objects
• Group IAG
• Object Search and Classification