... There will likely be science programs that do not fit exactly into any one of these categories, or that have different requirements. Very Short Exposures : If each target is observed for less than a few minutes then the extra overhead for dithering can significantly impact the overall S/N, thus offsetting any advantages gained by dithering . ... Even if sub-pixel dithering is not necessarily required, dithering each exposure by an integer pixel shift reduces the impact of hot pixels. ...

... A three-cell test section roughly representative of the primary mirror was provided for this test by the Steward Mirror Lab. ... Additionally, the tests are intended to determine relative airflow vs. pressure drop characteristics for each of the air flow patterns so the results can be evaluated both as a function of flow rate and of pressure drop along the flow path. ... The bottom (top as installed) was cut out so it could close the chamber for heating and be removed for the cooling tests. ...

... The Chilled 3-chip Color CCD Camera C5810 was developed to provide real color imaging in low light level conditions. This camera incorporates 3 CCD chips coupled to a trichromatic beam splitter that reproduces real colors at all microscope intensities. ... Peltier elements are used to cool the CCDs to reduce thermal noise to minimal levels while fixed pattern noise such as illumination shading and any remaining thermal noise can be removed with the built-in image subtraction feature. ...

... 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). ...

The UVKLIB spectral library (A.J. Pickles, PASP 110, 863, 1998) provides spectra for different spectral types in the domain 115-2500 nm with a step size of 0.5 nm. Kurucz model spectra cover the range 100-1100 nm with a step size of 0.1 nm. ... Produced by J. R. Walsh (Space Telescope European Coordinating Facility), May 1996. ... File Name Spectral coverage Comments (angstroms) elliptical 1235 - 9935 - s0 1235 - 9940 - sa 1235 - 9940 - sb 1235 - 9940 - starb1 1235 - 9945 starburst with E(B-V) . ...

Hide Zen home . ... Large scale survey projects produce huge amount of data, which needs to be processed and organized in databases to provide access by astronomical community. There are many problems in the current state of art of accessing large astronomical databases and organizing programmatic access to the distributed and diverse data, which Virtual Observatory initiative should eventually to solve. ... Nowadays, it's not unusual to work with billions of objects in terabyte-sized database. ...

The ion rocket is another means of providing thrust, more gradually but also more efficiently than a conventional rocket. ... As in the nuclear rocket, the energy which propels the xenon jet comes from a different source; here it is electrical energy from solar cells. The reason an ion rocket is much more efficient than ordinary rockets is the way its jet is produced. ... As with solar sails, solar ion engines are mainly practical in the inner solar system, where ample sunlight is available. ...

. UNIX provides you with a comprehensive programming environment. There are tools for: . automating program builds . checking program syntax . de-bugging source code . maintaining different versions of source files . producing program documentation . Using the Source Code Control System .

... PmWiki . Summary: PmWiki group header. ... PmWiki .Search$:Audience} . ... This page uses custom searches. ... For example, a search can be restricted based on groups, where, for instance, "group= PmWiki " searches only the PmWiki group, and "group=- PmWiki " searches only pages that are not in the PmWiki group. ... Readers can create targeted and customized search results simply by typing the relevant parameters , e.g. "group= PmWiki ", into search boxes together with their search string. ...

OptInt PmWiki : Pm Wiki / Search . This page uses custom searches. For regular searches, view another page. ... For example, a search can be restricted based on groups, where, for instance, "group=PmWiki" searches only the PmWiki group, and "group=-PmWiki" searches only pages that are not in the PmWiki group. ... Readers can create targeted and customized search results simply by typing the relevant parameters , e.g. "group=PmWiki", into search boxes together with their search string. ...

... XRB SEDs | ... By using RXTE to determine the spectral state of a system we intend to generate SEDs using data that may have been taken at different times but were taken at similar X-ray states. Due to its all-sky coverage and long operational time, the RXTE/ASM instrument provides unparalled information on the spectral states: an ideal jumping-off point for studying time-dependent properties of X-ray binaries. ... Blue arrows designate X-ray observation times. ...

... Directives | ... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 > Modules . ... Core Authentication . ... This module provides core authentication capabilities to allow or deny access to portions of the web site. mod_authn_core provides directives that are common to all authentication providers. AuthName . AuthnProviderAlias> . ... The example below creates two different ldap authentication provider aliases based on the ldap provider. ... Directory> . ...

... 8, ``Celestial Mechanics'', 2002 The ephemerides server of the Institut de m'ecanique c'eleste et de calcul des 'eph'em'erides N. Baron, J. E. Arlot Institut de m'ecanique c'eleste et de calcul des 'eph'em'erides, Paris, France The Institut de m'ecanique c'eleste et de calcul des 'eph'em'erides (IMCCE), formerly known as Bureau des longitudes, produces, since its creation (1795), the French ephemerides for most of the bodies of the solar system. ... The code of several theoretical models is provided...

... Clearing the library. Note the different flooтАж . Sidebar Left . Sidebar Top . ... Title: Clearing the library. Note the different floor levels. There were at least 4 different levels of underfloor in the library. Description: NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ...

... WIP is an interactive package with a simple to use interface designed to produce high quality graphical output. WIP was developed as part of the Berkeley-Illinois-Maryland Association (BIMA) project and is available via anonymous ftp. ... Included in the WIP distribution is a complete manual which contains several sample figures with associated commands, a frequently asked questions section, and a descriptive listing of all available commands. ... Figure illustrates WIP's ability to handle images. ...

... One noise source was connected to pixels 1ab,2ab,3ab,4b,5ab,6ab,7ab . ... Cross correlation (of power) by freq channel using pixels 4a and 4b . 1000 samples (4 seconds of data) was used to compute the correlation coefficients (by channel) between pixel 4a and 4b. These pixels had different noise sources for input. ... The cross correlations using the same noise source (but different digitizers) should be 1 if all of the noise power was coming from the noise source. ...

... Cheers, -Mike Data Providers (e.g., data centers, archives) Provider Name: NOAO Collection: High Resolution Atlas of Arcturus Spectra - 0.92-5.36 microns Characteristics: 310 ASCII tables of wavenumber vs flux Storage Format: Text tables Available online: ftp://ftp.noao.edu/catalogs/arcturusatlas/ir Comments: Tables contain three flux values (arcturus spectrum, telluric spectrum and ratio) for both summer and winter observations. ... Linelists also available as text table ...

SAI VO . ... SAI CAS . ... Access . ... We present the results of the development of Sternberg Astronomical Institute Catalog Access Services (SAI CAS) project - the first and the only project in Russia, which provides online access to the major astronomical catalogues and different services on top of them. ... SAI CAS is an open-source implementation of the general Catalogue access service (influenced by SDSS CAS CASjobs project), based on original algorithms and open-source software. ... SAI MSU | ...

Nalini Chandra & John Percy, University of Toronto . ... Some works to refer to when using multicultural astronomy in your classroom: . ... Nalini Chandra is a doctoral candidate at the University of Toronto in the Department of Curriculum Teaching and Learning at OISE/UT. ... OISE-University of Toronto . ... John Percy, Professor of Astronomy at the University of Toronto, is a Past President of the ASP, and is active in astronomy education at all levels. ... ASP Multicultural Astronomy Resources . ...

... I would several points which we faced during our everysolved for better quality of individual ACs' and EOP products · There are two main EOP products provided by two IERS Product Centers on Earth Orientation (Earth Orientation Center (EOC) and Rapid Service/ Prediction Center (RSPC)). ... However, the latter is not provided by the IERS. ... ITRF · Using ITRF in computation of EOP series produced by various ACs seems to be a necessary condition to provide the consistency between the IERS products. ...