... Next: MEM Task for Up: Image Restoration and Previous: RegisteringPSF-Matching and . ... In gyro-hold tracking mode, HST is stabilized only with its gyros, and the Fine Guidance Sensors are not used to maintain pointing. ... Experiments have been done on WFPC 2 images of NGC 330 and NGC 422 (having exposure times of 80 and 100 s in gyro-hold mode) with complete success. ... An NGC 422 WFPC 2 WC2 image and an NGC 330 WFPC 2 PC1 image were taken in mode FSGLOCK = GYROS in 1994 January. ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

Optical and UV Spectrophotometric Standard Stars . ... Two papers detail the observations: the first is devoted to wavelengths from 3300 to 7550A (Hamuy et al., ... -------------------------------------------------------- 718 Xi2 Cet B9 III -O.107 -0.056 4.279 -0.023 -0.063 1544 Pi2 Ori Al V 0.01 4.355 0.014 0.039 3454 Eta Hya B3 V -0.743 -0.200 4.295 -0.083 -0.200 4468 Theta Crt B9.5 V -0.18 -0.07 4.700 -O.023 -0.063 4963 ...

... The absolute flux calibration of NICMOS will be calculated from observations of standard stars with known flux distributions F( ). ... In order to expand the set of IR standard stars in the appropriate flux range for NICMOS, M. Rieke, R. Thompson, and collaborators at the University of Arizona are making photometric observations of solar-analog stars, which will be used to normalize the solar spectrum to the observed IR magnitudes. ... Relative flux references accurate to 1.5% for standard...

Next: Reduction procedure Up: Extinction and transformation Previous: Strategy . Standard stars can be included in the extinction solution, if one is careful. The problem is that there are usually appreciable ``conformity errors'' due to mismatch between the instrumental and the standard passbands [ 16 ]. ... Thus, it is wrong to assume that the transformation between the instrumental system and the standard system is exact, even if there were no measurement error in either system [ 1 ]. ...

XMM­Newton CCF Release Note XMM­CCF­REL­120 OM Photometry Bing Chen July 5, 2002 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag OM COLORTRANS 0007 2000­01­01T00:00:00 COLORMAG No 2 Changes The zero­points and color­transformations for optical filters are set based on observations of several hundreds standard stars. ... We can see that the simulated UV color­transformation based on this new CCF can represent the observations. ...

... This routine is designed to read in the current correlator set-up, go to the chosen source, and then take data pointing directly at the specified source. This routine will automatically wait until you are on source before beginning to take data. ... Additionally, this routine allows you to take an ON/OFF calibration pair (one 10s scan with the noise diode on, followed by a 10s scan with the diode off), using the chosen noise diode configuration (see Section 1.6 . ...

... NONE causes the system to do only the same background monitoring that is done when the antenna is idle. SPECIAL or a specific file name uses a special list of monitor points and logging intervals provided by the VLBA operators. ... STANDARD , NONE , and POINTING are not case sensitive. Any special file name must match in case the name of the file loaded at the sites. ... Options: STANDARD , NONE , POINTING , or the name of a special logging file that the operators have put at the stations. ...

... The first step to improve the FORS calibration is therefore to obtain data to allow a computation of the illumination correction across the field. ... Another limitation on the calibration accuracy has been the brightness of the Landolt standards which have forced the use of extremely short exposures introducing small but non-negligible shutter-time errors and also resulting in a very small number of useful standards per frame. ...

... The material in "From Stargazers to Starships" meets several important requirements of the national standards. Pages cited below are from National Science Education Standards National Academy Press, Washington 1995. ... For example: the sections on astronomy not only describe calendars and sundials (including their construction), but also the astronomy of the ancient Greeks, including two different ways in which ancient Greeks estimated the distance to the Moon. ...

... Posts tagged ?standard candle? ... In addition to Bayesian methodologies, like this week?s astro-ph, studies on characterizing empirical spatial distributions of voids and galaxies frequently appear, which I believe can be enriched further with the ideas from stochastic geometry and spatial statistics. Click for what was appeared in arXiv this week. ... 1 Comment . ... If you find any problems of viewing the slog, please notify me. ... Entries RSS . ... Entries (RSS) and Comments (RSS) . ...

... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 > Miscellaneous Documentation . ... This page documents all the relevant standards that the Apache HTTP Server follows, along with brief descriptions. ... http://www.rfc-editor.org/errata.php - RFC Errata . ... This document summarizes the history of HTML development, and defines the "text/html" MIME type by pointing to the relevant W3C recommendations. ... HTML documents are SGML documents. ...

Next: Buffer Manipulation Up: Programming in C Previous: Compiler Options . Listed below are nearly all the ANSI C standard library functions. The header file where related definitions are stored are given. These may vary on some systems so check local reference manuals. ... More info can be obtained from online man calls or reference manuals. Buffer Manipulation . Character Classification and Conversion . ... File Manipulation . ... Wed Sep 14 10:06:31 BST 1994 ...

... 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. ... MeadeтАЩs new LX70 Series offers high-quality German equatorially mounted telescopes with slow-motion controls and heavy-duty steel tripods. ... For crisp wide-field observing and imaging, few optical designs match the performance of a true triple-element apochromatic refractor. ... Meade Standard Field Tripod #07020. ...

... Append the name of the output grid file. ... CYLINDRICAL PROJECTIONS: -Jc lon0 / lat0 / scale (Cassini) -Jj lon0 / scale (Miller) -Jm scale ( Mercator - Greenwich and Equator as origin) -Jm lon0 / lat0 / scale ( Mercator - Give meridian and standard parallel) -Joa lon0 / lat0 / azimuth / scale (Oblique Mercator - point and azimuth) -Job lon0 / lat0 / lon1 / lat1 / scale (Oblique Mercator - two points) -Joc lon0 / Je lon0 / lat0 / scale (Equidistant). ...

... The Theoretcial Astrophysics subroutine library provides constants and functions commonly used in astrophysical modelling. It began in 1992 as a joint project between CCP7 and Starlink, initiated by Simon Jeffery and Paul Rees. ... SUBROUTINE TAP_ESYMB ( IZ, SYMBOL, STATUS ) . ... SUBROUTINE TAP_ENAME ( IZ, NAME, STATUS ) . ... SUBROUTINE TAP_ABINI ( TAP_ABUND, STATUS ) . ... SUBROUTINE TAP_ERROR ( TAP_ROUTN, NAME, TEXT, STATUS ) . ... SUBROUTINE TAP_ERREP ( TAP_ROUTN, STATUS ) . ...

We would like to announce a further pre-release of a standard for the exchange of optical (visible/IR) interferometry data. Earlier versions of this standard were presented and discussed at the 2001 and 2002 meetings of the IAU Working Group on Optical/IR Interferometry. The latest draft addresses points raised at the 2002 Working Group Meeting. ... Please reply to the oi-data email list server: oi-data@rsd.nrl.navy.mil John Young (COAST) and Tom Pauls (NPOI) ...

... 141570 Mendeleevo, Moscow region, Russia, VNIIFTRI. ... Values r and t are the functions of time , but value c is the function of time in less extent and value d almost does not depend on time Step-by-step We produce comparison by comparison standard in several steps: Comparison standard (Leica TDA 5005) and retroreflector are calibrate on national state standard of length; Transfer comparison ...

Astronomy Discussion Forums . Forums: . ... Discussion Forums . ... Word Games Are Endless..hence The Need For Standards Of Honesty . Forum List | ... Post Message | ... of talking in endless circles . ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... FIELD | ... static int . ... Field Detail static final int AREA . ... Constant Field Values . static final int MEAN . ... static final int STD_DEV . ... static final int MODE . ... static final int MIN_MAX . ... static final int CENTROID . ... static final int CENTER_OF_MASS . ... static final int PERIMETER . ... static final int LIMIT . ... static final int RECT . ... static final int LABELS . ... static final int ELLIPSE . ... static final int INVERT_Y . ... static final int CIRCULARITY . ...