Optical Filters . The polarizer quads were also designed to map onto a four-faceted WFC configuration and, consequently, also require a partial filter rotation of -33 degrees to move the filter quadrant 1 (nominal polarization angle 135 degrees ) into WFCs 2 and 3, with some vignetting of both camera fields. Several additional partial rotations have been added to allow observations with different polarization angles on the same CCD. ...

. Go Here for Hubble Ultra Deep Field . ___________________________________________________________________ The Electronic Universe Project e-mail: nuts@moo.uoregon.edu

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

Next: Descriptor NFILTCAR Up: Instrument descriptors Previous: Instrument descriptors . The two most critical types of physical information needed about the filters themselves are (1) what are their transmission curves? and (2) does the instrument either regulate or measure their temperature? ... In addition, we need to know how many different filter-code fields appear in the data. Bearing all this in mind, here are the descriptors for filters: . Pascal Ballester . ...

... Abell 2218: A Galaxy Cluster Lens . ... The Milky Way in Infrared . ... Spiral Galaxy In Centaurus . ... The lovely Milky Way flows through this large constellation whose celestial wonders also include the closest star to the sun, Alpha Centauri, the largest globular star cluster in our galaxy, Omega Centauri, and the closest active galaxy, Centaurus A. A Lunar Eclipse Over Time . ... During last week's lunar eclipse, our Moon appeared to disappear. ... A Lunar Eclipse in Three Exposures . ...

... Staff . ... Friends of Arcetri . ... Arcetri designs innovative superconductor microwave filters for the Sardinia Ratio Telescope . ... A new microwave component based on HTS technology has been presented in a recent issue of the Journal of Astronomical Instrumentation, produced by World Scientific Publishing Company, in the article тАЬ A high temperature superconductor microwave filter working in C-band for the Sardinia Radio Telescope тАЭ by Pietro Bolli and collaborators (Fig.1). ...

Classroom Activity: Making a Rainbow . ... When white light from the Sun or a light bulb passes through a prism, the light splits into its component wavelengths. ... Red, blue, green colored filters - if possible, cut 1x4-inch pieces of the filters for each student . ... Many students have the misconception that filters somehow dye the light a certain color. ... Younger students can draw the rainbow and make up a mnemonic for remembering the order of the colors (such as, ROY G. BIV). ...

... Parameters . Filters . ... Direct images . ... The SCORPIO-2 project: . Spectral Camera with Optical Reducer for Photometric and Interferometric Observations - 2 . The broad-band glass filters made in SAO RAS are used for the observation in the Johnson-Cousins (UBVRI) photometric system in the direct images mode. The glass filters transmission curves are shown by solid line. ... The filters transmission curves of the `comets' filters measured with the SCORPIO-2 in the F/4 beam. ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. May 13, 1996 . Hubble's Constant and The Expanding Universe (I) . ... Explanation: Our Universe is expanding. ... The value of Hubble's constant was recently the subject of a popular public debate titled "The Scale of the Universe 1996: The Value of Hubble's Constant" . Tomorrow's picture: Hubble's Constant and The Expanding Universe (II) . ...

... 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. ...

... This will allow the telescope to be run at low cost after MACHO observations conclude at the end of 1999. ... In collaboration with the Anglo-Australian Observatory, the University of Melbourne and Auspace, the RSAA is developing an instrument known as the Wide Field Imager (WFI). ... During the report year the fabrication of the WFI dewar in the RSAA workshop was completed. ... Annual Report 1998 . ... In January 1998 two Stromlo staff travelled to the South Pole, Brett McLinden and Ralph...

... Table of Contents - Subject Index - Author Index - Search - PS reprint - PDF reprint . ... We have undertaken a project to create a database of all HST imaging observations organized by position on the sky. ... These ``pointings tables'' enable quick identification of overlapping fields that can be used for multi-wavelength studies of objects and for variability studies by comparing images at given positions over different epochs. ... Users select the instrument pointings table they wish to search. ...

... warning . ... For instance, if the PROPOSAL information record is missing the user can add a fake one to the SOSF without this having any effect on the data reduction. corrective action: Continue. ... For a certain exposure in the ODF one of the parameters was not found in the housekeeping data. ... The task has encountered a situation where the same CCD appears to be in more than one data mode. ... The task expected to find one and only one ODF component matching a certain instrument/data mode pair...

... SpectraSource's Lynxx camera contains a Texas Instrument TI241 chip and is an array of 165 x 192 pixels, each pixel is approximately 13.75 m by 16 m. The chip is housed within the camera head which is cooled by a thermoelectric cooler (TEC) to approximately 30 Celsius below the ambient temperature. ... A set of Johnson BVRI filters are used with the Lynxx, and a clear filter is used to maintain the focus on the chip when the BVRI filters are not being used. ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... 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. ... Coronado€о Solar . ... Spotting Scopes . ...

The project of the informational system creation on the problem of evolution of radio galaxies, as a part of the "Big Trio" project aimed on studing of distant radio galaxies, is designed. This system allows a user to operate with simulated curves of spectral energy distributions (SED) to estimate ages and redshifts by photometry data. Authors use SEDs of several models for different types of galaxies. ... The HTTP and e-mail access is organized to this system. ...

... Instead, new evidence obtained using the UK's Infrared Telescope (UKIRT) in Hawaii, spins a different story. Streams of spinning bullets have been discovered. These infrared bullets, moving at prodigious speeds, deposit the spin far away from the birth region'' , stated Armagh Observatory astronomer Dr. Michael Smith. ... Now, using the UK Infrared telescope in Hawaii fitted with sensitive instruments, a team of astronomers have found evidence that the jets of bullets are spinning. ...

Проект существует с июля 2002 года. Цель проекта - дать краткий обзор наиболее интересных статей, появившихся в библиотеке электронных препринтов astro-ph . Также в обзоры будут включаться статьи, появившиеся в списке astro-ph из других разделов. ... Параллельно в 2002-2003 гг. создавался списки обзорных статей, в которых подробно освещаются те или иные часто обсуждаемые вопросы (например, статья А. Линде hep-th/0107176 является одной из лучших обзорных статей по инфляции). ...

Log windows display messages from all "actors" (instruments, the TCC, the hub...) and allow you to send commands. Controls along the top allow you to filter out unwanted garbage or highlight messages of particular interest. ... Regular Expressions . ... The entry field for "+ Actors" and "+ Commands" filtering accept space-separated regular expressions . ... If you plan to send many messages to a particular actor, you may select the actor from the menu next to the command entry field. ...