The VLTI Calibrator Selector Tool is a tool intended to assist in the selection of suitable interferometric calibrators for VLTI observations with MIDI and AMBER. It uses a model of the VLTI and its instruments to assess the fringe visibility, given the observed bandpass, the geometry, spectrum, and coordinates of the target and the time at which the observations are to be made. ... The tool offers an HTML/Java based interface and consists of two pages. ... The quality flag depends on LDD_chi2. ...

CHIANTI - an atomic database for emission lines. ... K.P.Dere, E.Landi, H.E.Mason, B.C.Monsignori-Fossi, P.R.Young, 1997, A , 125, 149 . Article: Available from ADS . The Arcetri Spectral Code for thin plasmas . E.Landi M.Landini 1998, A , 133, 1 . ... E.Landi, M.Landini K.P.Dere, P.R.Young, H.E.Mason, 1999, A , 135, 339 . ... K.P.Dere, E.Landi, P.R.Young, G.Del Zanna, 2001, ApJS, 134, 331 . ... G.Del Zanna, B.J.I.Bromage, E.Landi, M.Landini, 2001, A , 379, 708 . ...

... xs qpspec source qpoe file (xdata$rp110590n00.qp): xdata$rp110590n00.qp[ time =(1606720.00:1607479.00)] source region descriptor ():c 6947 9325 2' background qpoe file ( ): bkgd region descriptor (): a 6947 9325 3' 4' root name for output files [root_obs.tab, etc.] (): arlac_1 ds: 0 file : arlac_1_obs.tab scale: 0.00 mission: 20 seqno: CA110590P.N6 instrument: ROSAT_PSPC sub-instrument: 1 no. pha channels: 34 mean off-axis angle of events (arcmin ...

At Arecibo we have a variety of optical instruments that we use to study terrestrial airglow emissions. ... As a complement to the airglow instrumentation we also maintain a set of optical instruments, called lidars, used for "active" remote sensing of the atmosphere. That is, we generate our own source signal using lasers and measure the characteristics of the light scattered back from the atmosphere. ... An operations manual for the Optical Laboratories is currently under major revision. ...

Next: The ESO VLT CCD Detectors Software . ... Up: Instrument-Specific Software . ... The framework for data calibration and analysis of the VLT instrumentation is presented, based on the concepts of a calibration plan, pipeline calibration, quality control, and archiving of calibrated data for a ground-based observatory. ... Quality Control Pipeline provides quality assessment for instrument performance data and observing conditions, and tests the results of the Reduction Pipeline. ...

APO/GIFS Instrument Factsheet The Goddard imager and Integral Field Spectrograph (GIFS) has recently been commissioned on the APO 3.5 m telescope. This factsheet presents a high level overview of the GIFS instrument. ... GIFS Imaging The GIFS imaging mode is used for imaging science and target acquisition for the IFS mode. ... Imaging Mode pixel scale: 0.168"/pixel · Comparison to Other APO 3.5m instruments: The GIFS field of view is smaller than SPICAM, but the filter set is far more extensive. ...

Ground-Based Mid Infra-Red Observations of Nearby Starburst and AGN Galaxies Bo jan Nikolic , Paul Alexander, Garret Cotter and Malcolm Longair Astrophysics Group, Cavendish Lab, Cambridge, U.K. Marcel Clemens Universita degli Studi di Padova, Italy Abstract. We present preliminary results of recent spatially resolved mid infrared (Mid-IR) spectroscopy with the MICHELLE instrument on UKIRT of NGC 7469, observed as part of a larger programme to study a sample of starburst and AGN in the Mid-IR. ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... Meade Instruments . ... Telescopes . LX850 Series . ... Superb optical performance coupled with time proven computerized pointing and tracking has made the LX200 ACF series a best-seller in the high-performance telescope class. ... Meade's revolutionary LS LightSwitchтДв series of telescopes use advanced technologies to do what no other consumer telescopes have done before: take all the hassle out of using a telescope. ... CES Media Kit . ...

... We have made observations of the Perseus cluster with the Westerbork Telescope at 610 MHz. ... Several newly detected sources are identified with cluster galaxies. ... No evidence is found for the existence of the previously reported ~ 65'x25' cluster halo, 3C 84B. Key words: radio galaxies - clusters - tailed radio sources buoyancy The Perseus Cluster of galaxies is one of the most fascinating systems accessible to extragalactic astronomers. ...

Peremennye Zvezdy ( Variable Stars ) 26 , No. ... Moscow 119992, Russia . ... 84/32, Moscow 117997, Russia . ... Our CCD observations compared to times of minima derived from the archival photographic plates and from the NSVS and ASAS-3 data clearly show that the orbital period of the system is variable. ... The phased light curve for the light elements . ... CCD, Moscow . ... and for the current linear light elements (in excellent agreement with the NSVS, ASAS, and our CCD observations): . ...

... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Staff list | ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Australia Telescope Online Archive (ATOA) . ... VLBI . ... Science & Technology . ... Australia Telescope 20GHz Survey . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... CSIRO Radio Astronomy Image Archive . ...

Text of these problems is available also in other languages : . ... What can one see in the Moon's sky more often - the Sun or the Earth? ... There are about of 250 millions of stars in the elliptical galaxy M32 (a satellite of Andromeda galaxy). ... The masses of Capella's components. ... You are proposed to estimate the masses of Capella's components, using our observational data. ... A galaxy's mass. ... Estimate the mass of FGC 1908 and compare it to the mass of our galaxy. ...

Instruments and Methods 125 Long time tracking of the Sun with RATAN-600 in Radio Schmidt mode V.B. Khaikin, E.K. Ma jorova, I.G. E mov, O.A. Victorov, V.M. Bogod, and S.Kh. ... Cosmic source tracking with unmovable main mirror in a form of cylinder requires a special secondary mirror of double curvature 12 m size or a phased array in the focal plane of an ordinary secondary mirror Ka jdanovskij, 1980. ... Fig. 4 shows the Sun tracking with new drive in speed control mode starting from meridian. ...

Static Fourier spectrometers are often used for spectral measurements of the ionosphere emissions. There are two main advantages of Fourier spectrometers (FS) - large geometric factor and high spectral resolution; these parameters are two orders better than for grating spectral instruments. ... In scanning Fourier spectrometer optical and electric modulation of signal is used to avoid this problem, for static Fourier spectrometer there are no such ways. ...

... On­The­Fly Re­Calibration of HST Observations B. Pirenne and A. Micol Space Telescope -- European Coordinating Facility, ESO, Garching, D­85748 D. Durand and S. Gaudet Canadian Astronomy Data Centre, DAO, Victoria, BC Abstract. ... On­the­fly re­calibration data flow: from request submis­ sion to data delivery. ... On­the­fly re­calibration has another advantage for our archive sites: we only need to keep the raw data and calibration reference files on­line for the process to be automatic. ...

... The Science Operation Department is composed of Astronomers, Telescope Instruments Operators(TIOs) and Data Handling Administrators(DHAs). ... Astronomers have proposed several methods to quantitatively measure the amount of turbulence above the telescope, which the most common ones is Differential Image Motion Monitor (DIMM). In optical testing, the Hartmann test is the common method to test the quality of optical components. ... Hartmann mask consists of 48 lenses. ...

... One of the instruments, the Troughton equatorial telescope, is maintained at constant temperature and relative humidity, to reduce the rate of deterioration. ... 3.1 Troughton Equatorial Telescope . Figure 1 shows the equatorial telescope constructed by J E Troughton of London and which was erected in the west dome of Armagh Observatory in 1795. ... Troughton, J. E.: c.1790, Instructions for Adjusting the Troughton Equatorial Telescope, Armagh Observatory Archives , M17.2, 3pp. ...

... Navigation in the near planetary space, Mars and Phobos observations. ... navigation in the near-planetary space based on images of Mars, Phobos and the starry sky; . Phobos high resolution imaging; . ... angle               angle . ... Number of TV-cameras                     2                       2 KNM — Mars Observation Camera — is being designed as the scientific instrument of the Phobos-Grunt mission. ... Both instruments are developed for Russian Phobos-Grunt project. ...

Magnetic field measurements onboard the Interball Tail spacecraft are carried out by the FM-3I instrument which consists of two flux-gate magnetometers covering two different ranges: [-200, +200] nT and [-1000, +1000] nT. Besides scientific goals, the FM-3I experiment data is used to perform the attitude control of the Interball Tail spacecraft. ... August 22, 1995 . ... October 18, 1995 . Top of the page . ... Back to the Interball Home Page . ...

Beginning from the May of the 1997 we started to publish our daily solar radio observations at RATAN-600 radiotelescope. ... Periscope System: South Sector+Flat Mirror . ... It is possible to track a source by moving the secondary mirror along the arc-shaped railway tracks or to perform azimuthal 2D map synthesis . ... 1) It is possible to simultaneously carry out independent observing programs using individual sectors at various discrete azimuths and secondary mirrors on corresponding railway tracks. ...