... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Asteroid 2010 SO16 and the Earth follow similar orbits around . the Sun. ... out a horseshoe shape in space, taking 175 years to go from . ... Asteroid 2010 SO16 takes 175 years to make the trip from one end of the horseshoe to the other. ... Currently, three other horseshoe companions of the Earth are known to exist but, unlike 2010 SO16, these linger for a few thousand years at most before moving on to different orbits. ...

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• Impact Hazard
• Co-orbital asteroids
• Taurid Complex

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Slacker Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Life Under the Moon . ... Seeing Jupiter's Moons . ... Time Zones and the Spherical Earth . A Companion to the Earth? ... December 19, 1999) . ... Big Moon, Little Moon . ... How Big is the Moon? ... 14, 2000) . ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! Talk about Bad Astronomy on the BA Bulletin Board! ...

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• Phil Plait's Bad Astronomy: Misconceptions: Coast to Coast Am
• Phil Plait's Bad Astronomy: Bitesize Tour of the Solar System
• Phil Plait's Bad Astronomy: Misconceptions

T he Siding Spring Survey (SSS) is a Near-Earth Object search program that utilises the 0.5-m Uppsala Schmidt Telescope at Siding Spring Observatory, N.S.W., Australia. ... The mission of the Siding Spring Survey is to contribute to the inventory of near-earth objects (NEOs), or more specifically, the potentially hazardous asteroids (PHAs) and comets (PHOs) that may pose a threat of impact and thus harm to civilization. ... Based on the CSS Mission page . ... Siding Spring Survey Main Page . ...

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• Mass Feeding and Feedback in Young Stellar Objects
• Surface Gravity

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
• Near-Earth Asteroid Tracking - NEAT, AstroGuide Listing
• Discover The Science Behind The "Wormwood Star Prophecy" - an Astronomy Net God

Astronotes Armagh Planetarium's Stellar Blog! ... Diagrams showing the familiar inner Solar System, outer planets and Kuiper Belt (plus Pluto), Sedna?s orbit and the beginning of the Oort Cloud (Image credit: NASA) . ... At its closest to the Sun, Sedna is about 76 AU from our star, at furthest some 937 AU.?а Sedna and VP113 are believed to be escapees from the Oort Cloud. ... Almost certainly, in the years to come astronomers will find more large worlds between the Kuiper Belt and Oort Cloud. ...

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• Kepler 36b and c: Too Close for Comfort | Astronotes
• Rings Around an Asteroid | Astronotes
• The Mystery Object of M82 | Astronotes

Astronomy Picture of the Day . Animation of Asteroids Passing Near Earth . ... The above time-lapse animation follows the orbit of the Earth around the Sun for two months in 2002 as numerous asteroids , also known as minor planets , approach and pass by. ... Although none of the plotted objects came inside the orbit of our Moon, our Solar System is filled with objects as small as bits of sand, usually left by a comet, that appear as meteors as they streak into the Earth's atmosphere every day. ...

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• XWare > APOD
• Journal "Peremennye Zvezdy"
• Астронет > Animation of Asteroids Passing Near Earth

... In addition to the planets and their satellites the solar system contains a large number of smaller but interesting objects. T here are thousands of known asteroids and comets and undoubtedly many more unknown ones. ... There are also some asteroids whose orbits carry them closer to the Sun than the Earth (Aten, Icarus, Hephaistos). Most comets have highly elliptical orbits which spend most of their time in the outer reaches of the solar system with only brief passages close to the Sun. ...

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• An Overview of the Solar System
• Kuiper-Oort
• Solar System Extrema

... 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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• Arecibo Radar Discovers Triple Near-Earth Asteroid
• Present Exploration of the Solar System
• Asteroid 1998 QE2 and Moon Safely Pass Earth

... 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: Guest Observer
• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: What Have We Learned About Halley's Comet?

... In addition to the planets and their satellites the solar system contains a large number of smaller but interesting objects. There are thousands of known asteroids and comets and undoubtedly many more unknown ones. ... There are also some asteroids whose orbits carry them closer to the Sun than the Earth (Aten, Icarus, Hephaistos). Most comets have highly elliptical orbits which spend most of their time in the outer reaches of the solar system with only brief passages close to the Sun. ...

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• Kuiper-Oort
• Jupiter's Inner Moons
• APOD: 2002 July 24 - Our Busy Solar System

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)
• Keywords_244
• Keywords_102

... Tonight's Sky . ... The Magazine . ... Star Atlas . ... An artificial comet holds secrets to Earths life . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... The planet has extreme temperature swings and perhaps active lava flows. ... A digital supplement to Astronomy magazine. ... Join TravelQuest International with Astronomy and Discover magazines on one of three great tour options surrounding this celestial spectacle . ... Astronomy Magazine . ...

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• Why do the outer planets have more moons than the inner planets? | Astronomy...
• Giant comets could pose danger to life on Earth | Astronomy.com
• near earth objects | Astronomy.com

... Research objects and scientific purposes . Space scientific program includes development and launch of two supersmall spacecrafts "Universitetskiy" and "Kompas-2" intended for monitoring of radiation conditions near the Earth. ... All the studies conducted in the near-Earth space are characterised by strong radiation fields. ... The circular polar orbits, which cover all the near-Earth space, are the most favorable for comprehensive studies of the radiation conditions near the Earth. ...

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... Asteroid . ... In case you didn't hear about it, which you probably didn't: On Jan. 7, an asteroid 1,000 feet across -- nearly three times the current diameter of Marlon Brando -- barely missed the Earth, which is most likely your planet of residence. ... What if this asteroid had hit the Earth? ... As it happens, the American Astronomical Society was holding a conference in Washington AT THE VERY SAME TIME as the asteroid nearly hit the Earth. ...

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. Mars is "behind" the sun from the earth's point of view and is therefore not visible in the nighttime sky (i.e. its up in the daytime). Venus it at greatest elongation and appears in the western sky as a bright object for 2-3 hours after sunset .

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• The Galaxy Gallery: Messier Objects
• Formation of the Earth
• All about Jupiter

... The remote planet Pluto and its moon Charon orbit the Sun at a mean distance of almost 6,000 million kilometres, or nearly fourty times farther out than the Earth. During a recent investigation by an international group of astronomers [1], the best picture ever of Pluto and Charon [2] was secured with the European Space Agency's Faint Object Camera at the Hubble Space Telescope (HST). ... The new HST image was taken when Charon was near its maximum elongation from Pluto (0.9 arcseconds). ...

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• Comet Halley
• First Rotation Period of Kuiper Belt Object Measured (ESO PR Photo 41/98)
• Rapid Changes in the Inner Coma of Comet Hyakutake

Hubble Finds Oxygen Atmosphere On Jupiter's Moon Europa . Astronomers using NASA's Hubble Space Telescope (HST) have identified the presence of an extremely tenuous atmosphere of molecular oxygen around Jupiter's second moon, Europa . ... Europa's oxygen atmosphere is so tenuous that its surface pressure is barely one hundred billionth that of the Earth," said Principal Investigator Doyle Hall, of Johns Hopkins. ... The oxygen gas slowly leaks into space and must be replenished continuously. ...

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• Asteroid Introduction
• Jupiter's Moon Metis
• Appendix C - The Probability of Collisions with Earth

... The Kepler Mission: A Photometric Mission to Determine the Frequency of Inner Planets Near the Habitability Zone of Solar-like Stars . ... Kepler is a mission designed to detect and characterize Earth-sized planets around solar-like stars. ... However, if no other planetary systems exist with small inner planets, then the Kepler Mission will still discover some 1400 giant inner planets from their reflected light assuming that their frequency is as large as the results of Marcy and Butler indicate. ...

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• CSPICE Routines: BODN2C_C
• CSPICE Routines: BODS2C_C
• Near Infrared Camera and Multi-Object Spectrometer Instrument Handbook for

КОСМИЧЕСКИЙ КАЛЕНДАРЬ ЯНВАРЯ 2000 ГОДА . ... Jan 01 - Year 2000 . Jan ?? ... Jan 01 - Asteroid 1996 AX1 Closest Approach To Earth (0.702 AU) . ... Jan 03 - Asteroid 3745 Petaev Closest Approach To Earth (1.862 AU) . ... Jan 05 - Asteroid 1999 VO11 Near-Earth Flyby (0.218 AU) . ... Jan 08 - Comet P/1998 VS24 (LINEAR) Closest Approach To Earth (2.915 AU) . ... Jan 12 -[Image][Dec 02] Asteroid 1999 WA2 Closest Approach To Earth (1.100 AU) . ... Jan 14 - Mercury Occults 53 Sgr (6.9 Magnitude Star) . ...

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... Future seminars . P a s t seminars . Seminar council . ... Computer simulations of the orbital evolution of Jupiter-family comets (JFCs), resonant asteroids, and asteroidal, trans-Neptunian, and cometary dust particles were made. ... For dust particles we also considered radiation pressure, Poynting-Robertson drag, and solar wind drag. ... The maximum probability of a collision of an asteroidal or cometary dust particle with the Earth during its lifetime was for diameter d~100 microns. ...

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• The Earth's Magnetosphere
• The Inner Radiation Belt
• The Radiation Belt -- History