... The MROI makes use of optical interferometry, much like COAST . ... As a major collaborator, the Cambridge Astrophysics Group is currently developing some of the mechanisms below, specifically the delay line and the fast tip-tilt system. ... Fringe tracking is used to control the positions of the delay line trolleys to make sure the light beams from the different telescopes in the MROI arrive at the science camera beam combiners in phase so that an interference pattern can be produced. ...

... 2001 June 5 . Asteroid Eros Reconstructed . Credit : NEAR Project , NLR , JHUAPL , Goddard SVS , NASA . ... NEAR allowed scientists to discover that Eros is a single solid body, that its composition is nearly uniform, and that it formed during the early years of our Solar System . ... On 2001 February 12, the NEAR mission drew to a dramatic close as it was crash landed onto the asteroid's surface , surviving well enough to return an analysis of the composition of the surface regolith . ...

... While this preliminary set of reduced data will probably serve most of the immediate scientific needs, the final quality of the images and the accuracy of the photometry can be improved with some careful reprocessing. ... This will probably have a negligible effect on the noise in the combined images, but is something that might as well be done as long as the data are being reprocessed. ... In the reprocessed data, these objects will be masked before the images are combined. ...

Astronomy Picture of the Day . The Hills of Ganymede . ... Credit: The Galileo Project , NASA Explanation: This computer generated 3D close-up view of Jupiter's large moon Ganymede was created using image data from NASA's Galileo spacecraft. ... The result shows the furrows, craters, and hills in the region appropriately known as "Galileo Regio" with a resolution of about 250 feet. ... It is scheduled to return to Ganymede in April next year. ... April . ... Publications with keywords: Ganymede . ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

... In order to disentangle the effects of different climate variables on tree-ring growth rates of different species, and to explore the possibility that more than one species could improve the accuracy of the reconstructions of climate using tree rings, a methodical study of trees in close proximity to the Armagh Observatory climate station was initiated together with Ana Maria Garc?a Su?rez, and continued as part of the latter's PhD thesis with John Butler and Professor Mike Baillie (QUB). ...

June 28, 2010 Wider Bandwidths and a New 12m Antenna will keep . the Arecibo Radiotelescope at the cutting edge of . ... 12m reference antenna Photos by: Tony Acevedo . V ery Long Baseline Interferometry (VLBI) is the technique used to combine signals from radio telescopes separated by distances that can span different continents, or even reach between the Earth and an orbiting . ... Arecibo 305-m telescope is an active participant in both of these forms of VLBI. ...

... Wave nature of light 2. Ear th's atmosphere Wave nature of light Consider a perfect space telescope: A point source produces an Airy pattern (1) where ­ is (approximately) the width of the image, called the `angular resolution' ­ ­ is the wavelength is the diameter of the telescope aper ture Cause of Airy pattern: interference between par ts of the wavefront that arrive at different par ts of the aper ture (note dependence on wavelength) Each point on the source produces an Airy pattern. ...

Frequency Range (424kb) , sound clip demonstrating what different frequencies sound like. Frequency Differences (672kb) , sound clip how small a difference in frequency the ear can distinguish. Two Notes: Frequency differences (848kb) , sound clip demonstrating what combining two notes with similar frequencies can do. ... Emission line widths (844kb) , how the sound of an emission line varies as the width of the line is increased. ...

Quasar VLBI network observatories as co-location sites A. Ipatov, I. Gayazov, S. Smolentsev Institute of Applied Astronomy, Saint Petersburg, Russia ... supposes: 1. installation of different observational techniques at sites (co-location) 2. combined processing of different types of observations (collocation) IAA activity in space geodesy · Quasar VLBI network : ­ VLBI observations ­ GPS /GLONASS observations ­ DORIS ( ...

This document discusses the conventions for combining region and table filters, especially with regards to the comma operator. Filter specifications consist of a series of boolean expressions, separated by commas. ... Region and table filters can be combined: foo.fits[circle(10,10,3),pi=1:5] or even: foo.fits[pha==1 (10,10,3),pi==2 (20,20,8,5)] In these cases, it is not obvious whether the command should utilize an or or and operator. ...

XMM­Newton CCF Release Note XMM­CCF­REL­119 OM PSF Bing Chen June 13, 2002 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag OM PSF1DRB 0006 2000­01­01T00:00:00 PSF­U No PSF­B No PSF­V No PSF­UVW1 No PSF­UVM2 No PSF­UVW2 No 2 Changes This CCF file provides new measurement of OM PSF. ... 1 XMM­Newton CCF Release XMM­CCF­REL­119 Page: 2 Figure 1: Growth curves as a function of radius for V and UVW1 filters. ... Therefore, this new PSF is field position independent. ...

... The COMBINE/CCD command offers the possibility to combine a number of input images using different combining methods. COMBINE/CCD takes three input parameters at maximum: the exposure type of the images to be combined, the input frames themselves and and output frame. ... In the case of DO input (association) table, from the name of the output calibration frame in the table the command extracts the names of all requested single calibration frames and combines these frames in the output frame. ...

On Systematic Differences in Individual Solutions and IERS Products Zinovy Malkin Institute of Applied Astronomy RAS, St. Petersburg, Russia 1 Present status Proper determination, modelling, and accounting for systematic differences between contributed series is of the great importance in compilation of the IERS products. ... Possible sources of systematic differences are: · Different reference systems (e.g. TRF, CRF, geopotential, time scale). ... 87 IERS Technical Note No. ...

Next: Principles of organization Up: Further advance in the Previous: Further advance in the . ... An ability of using different catalogs makes this problem considerably simpler. Lately Different attempts have been made for combining many astronomical catalogs in unified databases NED, SIMBAD, ESIS, ADS, etc.(see reviews by Andernach et al.1994; Andernach 1995). ... We propose a new solution to this problem with a ``CATalogs supporting System'' (CATS) at Special Astrophysical Observatory (SAO). ...

... ME AND MY SCHOOL . SOURCES . THE CHART OF THE DIFFERENCES IN THE SPELLING OF SOME WORDS CONNECTED WITH SCHOOL AND EDUCATIONAL SYSTEM IN BRITAIN AMERICA. ... РАЗЛИЧНЫЕ СТРАНЫ ИМЕЮТ РАЗЛИЧНЫЕ СИСТЕМЫ ОБРАЗОВАНИЯ, НАПРИМЕР ВЕЛИКОБРИТАНИЯ ИЛИ СОЕДИНЕННЫЕ ШТАТЫ. ... ОБО МНЕ И МОЕЙ ШКОЛЕ(ME AND MY SCHOOL), . ... А ТАКЖЕ ВАМ ПРЕДЛАГАЕТСЯ ТАБЛИЦА РАЗЛИЧИЙ В НАПИСАНИИ И ПРОИЗНОШЕНИИ СЛОВ СВЯЗАННЫХ С ОБРАЗОВАТЕЛЬНОЙ СИСТЕМОЙ В США(AMERICAN ENGLISH)И ВЕЛИКОБРИТАНИИ(BRITISH ENGLISH)-THE CHART . ...

Next: Ionospheric Corrections in AIPS++ . ... Previous: AIRY: Astronomical Image Restoration in interferometrY . ... Calculate residual images for all facets (using 2-D transforms). Partially deconvolve individual facets and update the image model for each facet. ... The image in Figure 1 was made using the AIPS++ widefield algorithm with 225 facets. ... In calculating the residual image the residual visibility re-projection for the different facets can be estimated independently. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Concept Spacecraft . ... By admin September 24, 2010 Posted in: Concept Spacecraft . One of the most grandiose of the vehicles suggested by Cole was the Aldebaran concept, a gigantic nuclear-powered launch vehicle he proposed in 1959. ... Scott Lowther has recently added fascinating scale drawings of this and other nuclear space propulsion concepts at his blog (the Unwanted Blog). ... The Amazing Aldebaran Spacecraft | ...

... 7.1 Introduction to media types . ... 7.3 Recognized media types . 7.3.1 Media groups One of the most important features of style sheets is that they specify how a document is to be presented on different media: on the screen, on paper, with a speech synthesizer, with a braille device, etc. Certain CSS properties are only designed for certain media (e.g., the 'cue-before' property for aural user agents). ... For example, the 'font-size' property is useful both for screen and print media. ...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . Sun . ... solar system . ... Observe the Solar System . ... Tour the Solar System . ... The Sun's Heartbeat . ... Mission suggests Sun and planets constructed differently . Although the differences in oxygen and nitrogen are slight, the implications could help determine how our solar system evolved. ... Data revealed differences between the Sun and planets in oxygen and nitrogen, which are two of the most abundant elements in our solar system. ...