... 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 . ...

The solar system consists of the Sun ; the nine planets, more than 130 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 : . ... The planets of the outer solar system are Jupiter , Saturn , Uranus , Neptune and Pluto : . ... inner planets: Mercury, Venus, Earth and Mars. outer planets: Jupiter, Saturn, Uranus, Neptune and Pluto. ... Earth . ... Overview .. ...

... 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....

... 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. ...

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. ...

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 . ...

... 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). ...

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). ...