... 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 Unit Telescopes Overview - This page is outdated, an update is in process.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 Secondary mirror (M2 Unit) - This page is outdated, an update is in process.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 Coating Unit - This page is outdated, an update is in process. ...

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. ...

The VIRGO project is a physics experiment; its aim is the detection of gravitational waves. ... It has not yet been possible to detect directly the gravitational waves: it remains one of the major challenges of experimental physics. ... Interferometric antennas for gravitational waves Gravitational waves distort space-time: along two perpendicular directions, the distances between fixed points will increase (resp. decrease), at the arrival of a gravitational wave. ... Publications from our Group . ...

... 1971), Colla, et al. (1972), and Fanti et al. (1974). 2 name B2 name of source (char8, ex: '0512+24A') 1 cat Part of B2 catalog which contained the source (char4, example : 'B2.1') 3 dec_1950 radians Declination of source in radians (B1950) (real, example : 0.474555) 4 ra_1950 radians Right ascension of source in radians (B1950) (real, example : 5.125028) 5 dec_1950_deg degrees Declination of source in degrees (B1950) (real, ... Example (name) (char8): '0512+24A' . ...

... Flag 1: All those sources with a MASKFRAC column value lower than the value given by parameter mfraclimit will have their first flag set to true, i.e. from 'FFFFFFFFF' to 'TFFFFFFFF'. ... Flag 4: likely spurious extended source in 'circle of influence' of bright point source. This flag will be set if source is extended ( EXT extlimit), has Flag 2 set to true (i.e. is in circle of influence of a bright point source) and the causing source is brighter than counts given by parameter brlimit , i.e.: . ...

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

... The less then 5 degree value of the relative geocentric angular distance between the footprints of the SC is used as a criterion of the magnetic conjugation. ... On the last column of the file is shown the magnetic field model version ( MOD IOPT ) used during magnetic mapping. ... The difference between CMLT values of the Sat.1 and Sat.2 (see as well column 11) . ... dcorlat = dla (deg) . The difference between CORLAT values of the Sat.1 and Sat.2 (see as well column 12) . ... AnD (deg) . ...

Polaris Dust Nebula . ... Explanation: Centered on North Star Polaris , this 4 degree wide field of view covers part of a complex of relatively unfamiliar , diffuse dust clouds soaring high above the plane of our Milky Way Galaxy. The combined light of the Milky Way stars are reflected by the dusty, galactic cirrus , the reflected starlight having the same blue tint characteristic of better known reflection nebulae . ... NASA Web Site Statements, Warnings, and Disclaimers . ...

The antenna element Ravi ATNF, Narrabri 1. ... Miriad works out the radio Parabolic reflector: A parabolic reflector adds all the fields from a surface = aperture at a focal point. ... Feeds are `compact' and `corrugated' horns The inner profile is curved The inner surface has grooves Cross-section of a horn Sub-reflector 28 main-reflector Feed horn O `optical axis' The feed horn adds all the rays that come from the 28 deg. wide sub-reflector. The feed down-weights rays that come off-axis. ...

... According to the most popular cosmological paradigm, the greater part of the galaxy mass is accumulated in the dark matter halo. ... The polar ring galaxies (PRGs) reveal external rings or disks of gas, dust and stars rotating in a plane roughly perpendicular to the disk of the central galaxy. ... The shape of the dark halo in the model was chosen so as to achieve the best fit to the observed rotation of both galaxies themselves and their polar rings. ... The SPRC-7 galaxy. ...

... Tonight's Sky . тАФ . ... RISE тАФ . ... Observing . ... Star Atlas . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... What exactly is a degree in terms of the distance between stars? ... A measurement in degrees has nothing to do with the true distances between celestial objects. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

National Aeronautics and Space Administration . ... Buzz Aldrin, Ph.D. (Colonel, USAF, Ret.) NASA Astronaut (former) . ... NASA EXPERIENCE: Aldrin was one of the third group of astronauts named by NASA in October 1963. ... At Nellis Air Force Base, Nevada, he served as an aerial gunnery instructor. ... Since retiring from NASA, the Air Force, and his position as commander of the USAF Test Pilot School at Edwards Air Force Base in 1972, he authored an autobiography, "Return to Earth". ...

... We can help students grasp the significance of Hubble's extremely keen eye, and learn a bit about angles and math in the process, with the following in-class activity. ... Looking through binoculars or telescopes allows us to magnify a small section of the sky. To measure sizes or distances in that small section, astronomers divide a degree into 60 smaller pieces called arcminutes, and further subdivide minutes into 60 smaller sections called arcseconds. ... 30 feet = . ... 36 seconds . ...

splitxyz - filter to divide (x,y,z[, distance ,heading]) data into (x,y,z) track segments . splitxyz [ xyz [ dh ] file ] -C course _ change [ -A azimuth / tolerance ] [ -D minimum _ distance ] [ -F xy _ filter / z _ filter ] [ -G gap _ distance ] [ -H [ nrec ] ] [ -M ] [ -N namestem ] [ -S ] [ -V ] [ -Z ] [ -: ] [ -bi [ s ][ n ] ] [ -bo [ s ] ] ... If xy _ filter is non-zero, the data is first divided into segments and then the x,y values of each segment are filtered separately. ...

... The solid curve at the bottom show an approximation of the distribution by an exponential law, and the numbers give the scale height and its error. discussion in the text | next figure | previous figure . ...

... Byte-by-byte Description of files: star -S1.txt , star -S2.txt, star -S3.txt ------------------------------------------------------------------------------- Bytes Format Units Label Explanations 1- 4 I4 --- YYYY Year of the date 6- 7 I2 --- MM Month of the date 9- 10 I2 d DD Day of the date 13- 14 I2 h h Hour of the day 18- 24 F7,2 d JD* Julian day of the date , JD*=JD-2450000.5 28- 31 F4.1 degrees M-S Apparent distance between ...

... The object just above trap 2-637 in Figure 5 is a good example of how traps can affect the observations of point sources. ... In the case of the object above trap 2-637, the photometric magnitude measured within a 6-pixel aperture (i.e., radius = 3 pixels) is about 0.1 mag fainter than it should be, due to the tail taking light out of the aperture. The FWHM is increased from 1.5 pixels to 2.2 pixels. ... Another relevant question is what percentage of objects are affected by charge transfer traps. ...

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Antenna system . ... The Irkutsk incoherent scatter radar is one of the world's nine active radars which give the opportunity to investigate ionosphere by the incoherent scatter method. ... Antenna gain coefficient . ... Antenna . ... Two antennas . ... To get an idea what station "Dnepr" antenna system looks like, let us consider some of the radar views which are given by the photographs General view and Side view . ...

... Astrophysics Group . ... VSA . ... CAT . ... The Very Small Array is a custom-built radio telescope (operating between 26-36 GHz), designed expressly to make high resolution observations of the cosmic microwave background (CMB) radiation on angular scales around and below one degree. ... The VSA has been operated in ?compact array? and ?extended array? configurations (see the technical description below) and data collected to achieve high sensitivity in both regimes have been analysed. ... 1.75 GHz)...

SAI 175 anniversary . ... Moscow University . Search for in SAI Moscow University Search for in Russian astronomical resources . ... SAI Astronomical Databases . ... Browse SAI Software archive(ftp.sai.msu.su) . ASTRONET.RU - Russian Astronomical Network (available in translit also) . ... SAI Supernovae Research Group . ... Department of the Galaxy and Variable Stars (in Russian) . Sternberg Astronomical Institute Seminars . ... All-Russian Astronomical Olympiad (in Russian) . ...