... 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 . ...

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 . ...

T he solar system consists of the Sun ; the nine planets, sixty four (64) satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium. The inner solar system contains the Sun, Mercury , Venus , Earth and Mars : . T he planets of the outer solar system are Jupiter , Saturn , Uranus , Neptune and Pluto : . ... small planets: Mercury, Venus, Earth, Mars and Pluto. ... inferior planets: Mercury and Venus. closer to the Sun than Earth. ...

... Bad Astronomy . ... Bitesize Astronomy . ... If you thought our tour of the solar system ended with Neptune and Pluto, you are setting your sights way too low. The planets of the solar system mark time relatively close to the Sun compared to interstellar space. Pluto orbits the Sun at an average distance 40 times that of the Earth, yet the nearest star (the Alpha Centauri system) to the solar system is a mind-numbing 260,000 times the distance of the Earth to the Sun. ... 2008 Phil Plait. ...

... In Spiral . Between spiral . ... Center of vortices . ... to density exterema . ...

... ESO, the European Southern Observatory . ... ESO Acronyms . ... Survey Telescopes . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... First Objects . ... The relative sizes of a number of objects, including the three (known) members of Alpha Centauri triple system and some other stars for which the angular sizes have also been measured with the Very Large Telescope Interferometer (VLTI) at the ESO Paranal Observatory (Chile) during the year 2002....

... 40 Hz relative photometry (e.g., flares, occultations) with milli-mag accuracy Position Mode Observing As an astrometer, the FGS can measure the relative positions of stars in its Field of View (FOV) with a perobservation precision of ~ 1 mas. ... Relative Photometry Although the binary in this example is clearly resolved by the WFPC2 Planetary Camera (PC) (Niemela et al. 1999), the FGS could measure the component separation and relative brightness with greater accuracy (± 1 mas v. ± 30 mas). ...

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. ...

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. ...

... Materials needed: Ъ At least 1 meter of paper tape per person, such as adding machine paper Ъ Pen or pencil each Just to review, the order of the planets and large objects going out from the Sun and their average distances are: Object Distance in kilometers Distance in AUе Mercury 58 million 0.39 Venus 108 million 0.72 Earth 150 million 1 Mars 228 million 1.52 Asteroid Belt (including Ceres г) 416 million 2.77 Jupiter 778 ... Fold the Sun to the Asteroid Belt mark and crease it. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Our Galaxy . ... Stars . ... Space Flight . ... This activity is believed to be promoting the unusually high rate of star formation seen in M82. ... Radio image of M82 made with the MERLIN and VLA telescopes. Insets show MERLIN images from April 25th and May 3rd 2009 demonstrating the sudden appearance of the mystery object.€а All images are at a frequency of 5 GHz. ... Mystery object in Starburst Galaxy M82 . ...

... 50 Weirdest Objects . ... Observing springtime deep-sky objects with a large telescope . ... What effect, if any, do the objects in the Kuiper Belt and Oort Cloud have on the orbits or characteristics of the eight major planets? ... KUIPTER BELT | OORT CLOUD . Kuiper Belt and Oort Cloud objects can exert gravitational effects on the planets, but the real question is whether such perturbations are detectable. ... Get instant access to subscriber content on Astronomy.com! ...

... 8, ``Celestial Mechanics'', 2002 Preliminary results of search studies of predicted hypothetical objects beyond the orbit of Jupiter B. R. Mushailov, A. A. Kaloshin Sternberg Astronomical Institute, Moscow, Russia In paper [1] on the basis of the external variant of the restricted circular three­ body problem we calculated the most probable orbits of hypothetical asteroids moving in orbital commensurabily with Jupiter. ... The upper estimate of the brightness of these objects has been found as well....

Next: About this document Up: Multi-Object Spectroscopy Previous: Rebinning . To define your object's and sky regions use DEFINE/MOS . By default it automatically averages ( 20 ) columns around the position ( center of frame ) of the frame and searches for objects in this averaged frame that have an intensity above ( -0.04 ) when compared to a median over ( 5 ) pixels. can be absolute ( > 0) or relative to the median intensity ( < 0). ...

System of astrometric databases of Pulkovo observatory. ... The purpose of these observations is the determination of precise coordinates of Solar system bodies, which is necessary for development and improvement of motion theories, and for studying the evolution of the Solar system. ... Accuracy of photographical observations is about 0.2-0.3 arcsec for equatorial coordinates and 0.1-0.3 for relative coordinates of planetary satellites, depending on object and observational conditions. ...

Next: Member Functions (functions) Up: Interface Previous: Integer Indices are 0-relative Index . The ASAP interface is based around a number of ``objects'' which the user deals with. Objects range from the data which have been read from disk, to tools used for fitting functions to the data. ... A tool used to plot the spectral line data . ... A tool used to fit functions to the spectral data . ... A tool which can be used to read data from disks into a scantable object (advanced use). ...

... SATELLITE: An object that revolves around a planet. ... SIDEREAL DAY: The length of a planet's rotation period relative to the stars. SOLAR SYSTEM: The sun and all the objects that are held in its gravitational field and move around it. ... SUPERIOR CONJUNCTION: The position of a planet when it is on the opposite side of the Sun from Earth (thus making in invisible). ... TRANSIT: The movement of an object between the Earth and the Sun and showing on the surface of the sun as a black dot. ...

... Meade Instruments Corporation . ... Autostar Computer Controllers . 497 Autostar . ... One of the most important advances in telescope control in the past 25 years, the Meade #497 Autostar Computer Controller turns the ETX into an automatic celestial object locating system. ... The #497 Autostar Computer Controller plugs into the control panel of ETX-90EC, ETX-105EC, and ETX-125EC telescopes and enables automatic location of more than 30,000 celestial objects. ... about meade | ... Meade 4M | ...

This widget allows you to offset the telescope. ... Offset type : one of "Object Arc", "Object Arc XY" or "Boresight". ... This is motion on the sky or instrument, so don't worry about cos(dec). ... If you want to move that point (e.g. center your object along a different bit of the slit), then use a boresight offset. ... Note that a +X object xy offset will move the sky in the -X direction on the focal plane, because you are centering something in the +X direction on the boresight. ...

... Credit Copyright: DMR , COBE , NASA , Four-Year Sky Map Explanation: Our Earth is not at rest. ... The Milky Way Galaxy orbits in the Local Group of Galaxies . ... But these speeds are less than the speed that all of these objects together move relative to the cosmic microwave background radiation (CMBR). ... NASA Official: Jay Norris. ... Publications with keywords: COBE - dipole - microwave background . ... COBE Hotspots:The Oldest Structures Known . COBE Dipole: Speeding Through the Universe . ...