... We also take care to characterise the flat fields, especially their colour dependence, to very high precision which enables high precision photometry even without autoguiding. ... The Blue Diamond Effect The blue diamond effect is caused by surface imperfections on the silicon chip introduced during manufacture, resulting in a repeated large scale pattern in the flat field at blue wavelengths. ... We can remove the blue diamond by using a colour appropriate flat field produced in the lab. ...

... Coming Soon to a Channel Near You: Oracle.. ... But now users are discovering that this beefy class of multiprocessing, "fault-tolerant" PC servers handle databases just as well as mainframes and minicomputings. ... Programmers at four competing Unix software vendors are working together on what may be the last chance for Unix on the corporate desktop. ... COSE's Common Desktop Environment goes a long way toward establishing a standard Unix interface that's easy enough for novice users to master. ...

... Under certain conditions, like those in the nucleus of a QSO, all atoms can be made to emit light at particular wavelengths. ... If that source is approaching the observer, the wave is squashed up onto itself making the wavelength shorter. ... This is redshift. ... You can see how the section of the QSO spectrum which we observe changes with redshift. ... We then see how far we had to slide the observed spectrum along the scale to make it match and that is the objects redshift. ... The 2QZ team . ...

SDSS TRAILER INSTALLATION . The following links are to photos of the installation, removal and move for the observer's and engineer's office trialers at APO. ... 20020617: First observer's trailer installation . 20020617: Second observer's trailer installation . 20020617: Utility work for observer's trailer . ... 20020620: Pre-inspection of office area with exterior door . ... 20020622: Engineer's trailer installation . 20020622: Observer's trailer work . ...

Next: The Gravimagnetic Parameter Up: ``Ecology'' of Magnetic Rotators Previous: Nomenclature . ... One can introduce two critical periods and such that their relationship with period p of a magnetic rotator specifies the rotator's type: . ... Instead of , we introduce the potential accretion luminosity L . ... Treating the rotator's magnetic dipole moment and as parameters, we find that an overwhelming majority of the magnetor's stages can be shown on a `` '' diagram (Lipunov 1982a[ 98 ]). ...

... Actual stars are expected to be more complicated than these simulations. ... The spot may be entirely visible most of the time (one would observe a prolonged flux minimum low), and then part of it may disappear over the horizon briefly and then return (slow rise and then fall back to constant level). ... With the set of observations taken here, I have information available from several comparison stars and color information. ... The period found must be consistent with the data from any given night....

... ON THE ROLE OF LARGE-SCALE PLASMA IRREGULARITIES AT THE FINAL STAGE OF ANOMALOUS ABSOPTION DEVELOPING UNDER HF HEATING OF THE IONOSPHERE . ... Fig. ... With the aid of numerical statistical modeling based on multiple ray tracing it is shown that in presence of large-scale irregularities the reflected signal amplitude mean value is increased significantly. ... Dependence of the mean amplitude of the reflected from the ionosphere signal on the large-scale (10-50 km) electron density irregularity level...

. To remove a file use the command: rm [option] filename . To remove a directory use the command: rmdir directory_name . or rm -r directory_name . You cannot retrieve a file or directory that has been removed; it has been removed permanently. Removing files . Removing directories .

... As piles of ash are removed, the courtyard haтАж . Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: As piles of ash are removed, the courtyard has the top few cm of contaminated soil removed as well. Description: NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... As piles of ash are removed, the courtyard has the top few cm of contaminated soil removed as well. ...

... Now and then it experiences a magnetic storm , a disturbance of the magnetic field observable all around the globe, lasting a few days and adding appreciably to the Earth's trapped plasma. The storm is accompanied by large bright auroral displays, often extending well beyond the auroral zone, a rare spectacle for those not used to it. ... After analyzing them with a network of four stations, he concluded that they came from large electric currents flowing along the auroral arcs. ...

The revision of the MASS/DIMM star catalogue N. Shatsky, V. Kornilov March 16, 2008 Abstract The compilation of the (updated) version of the MASS (MASS/DIMM) device target catalogue is described. ... Then the list was cleaned according to following criteria: I. Remove stars too faint for a MASS device. ... Here the color equation of the Sternb erg device was taken: M AS S mag = V mag + 0.45 (B - V ); stars with M AS S mag > 3.2 were removed. ... This was made based on the GCVS4.2 catalogue data. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Moon . ... Comets and Asteroids . ... What changed our view of Chariklo is the discovery of a ring system around it, the first such feature found around a Solar System body smaller than a gas giant planet. ... Almost certainly the rings were born when a collision with a smaller asteroid blasted millions of tonnes of debris off CharikloтАЩs surface. ... A ring system detected around the Centaur (10199) Chariklo (Braga-Rigas et al.) ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

... Laboratory and theoretical modelling of the UV bump on the interstellar extinction curve is a very popular topic in dusty investigations. ... feature is illustrated by Fig. 10 where the profiles were calculated using the model of graphite spheres. Figure 10: Normalized extinction efficiencies for graphite spheres. ... The lower panel shows the summary extinction of two graphite spheres with radii and (from upper panel) taken in equal proportions. ...

... A1 centered at 2500 angstroms with a width of 1200 angstroms . ... M63 or NGC 5055 is a pleasant spiral galaxy with multiple arms and a bright inner region. The exposure times were 1149 seconds through B1 and 576 seconds through A1. NGC 752 a galactic stellar cluster was observed for 777 seconds through B5 . ... NGC 1365 is a prominent spiral galaxy in the Fornax Cluster. ... The galaxy fits comfortably into one UIT frame and this exposure was for 1360 seconds through A1 and B1. ...

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

... John Backus in New Mexico, 1976 . ... Other manufacturers came later with Fortran compilers for their machines and in 1962 IBM introduced the extended Fortran IV, which was the base for the 1966 agreed American standard ANSI X3.9 - 1966. ... An HTML version of the Fortran 77 Standard is now available! ... The purpose of the work on a new standard version was to make Fortran usable and efficient language for scientific and technical computations during the nineties. ... Parallel execution . ...

Finding Himalia, The Fifth Brightest Moon Of Jupiter . Articles | ... Himalia is the only moon other than the Galilean moons of Jupiter that is visible in an amateur size telescope. ... I normally use “The Sky” from Software Bisque for planning my observing sessions and in helping me find objects, but it only has the Galilean moons for Jupiter so I used Red Shift (version 3 at the time) which I also had on my computer. ... www.astronomy.net . ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Spherical aberration, coma, and astigmatism are also easily observed using the star test. ... Off-axis images are complex. ... Fig. ... Diffraction by a circular aperture as a function of defocus for no aberration Airy Disk 1 wave defocus Less than 1 wave defocus Fig. ... Diffraction by a circular aperture as a function of defocus for third-order spherical aberration Paraxial Focus Small distance inside paraxial focus Moderate distance from marginal focus Immediate neighborhood of marginal focus Fig...

... 1980 . ... A three-stage version of China's CSS-X4 intercontinental ballistic missile is being developed for various space applications. ... The rocket - to be known as "Long March 3"- has four gimbal-mounted engines in the first stage developing a com?bined thrust of some 280 tonnes. ... Four small gimbal-mounted motors provide thrust-vector control. ... The third stage, which employs LO 2 /LH 2 propellants, has four gimbal-mounted thrust chambers. ... CHINESE ASTRONAUTS. ...