The astrometric information in FITS images (also referred to as the WCS) is stored in the header using a standard set of keywords. The reference location is defined by the following keywords: . ... CD1_1 is the partial of first axis coordinate w.r.t. x . ... This facilitates proper translation of pixel to sky coordinates for science analysis, and allows for all the necessary shifting information for each image to be stored in the header of the image itself for future alignment reference. ...

... COMMENT Contact the NASA Science Office of Standards and Technology for the COMMENT FITS Definition document #100 and other FITS information. COMMENT HDRVER = '5.4 ' / Header version FITSTYPE= ' PSRFITS ' / FITS definition for pulsar data files DATE = ' ' / File creation date (YYYY-MM-DDThh:mm:ss UTC) OBSERVER= ' ' / Observer name(s) PROJID = ' ' / Project name TELESCOP= ' ' / Telescope name ...

... Winkelman, S. L., Rots, A. H., Michaud, K., & Blecksmith, S. E. 2003, in ASP Conf. ... We have collected the complete body of FITS keywords, as used in Chandra data products, into a dictionary database that provides easy access to their use and meaning. ... For the Chandra Data Archive almost all data products are in FITS format, following a stringent set of conventions concerning the data formats and header construction. ... A filetype is composed of one or more Header-Data Units (HDU). ...

... 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. ...

Next: Non-standard keywords Up: FITS keywords Previous: FITS keywords . ... The first group is translated into special MIDAS descriptors for the data structure in question. The conversion for image files is given in Table . The START descriptor of a MIDAS image refers to the first pixel and is computed from the values CRVAL and CRPIX for the reference pixel as given in the FITS header. ... Table: Name translation between standard FITS keywords and MIDAS descriptors. ...

... The revision numbers of all tables are currently zero. ... OI_VIS Keywords REVISION revision 0 I Revision number of the table definition Column Headings (one row for each measurement) TARGET_ID I (1) Target number as index into OI_TARGET table TIME INT_ TIME VISDATA VISERR UCOORD VCOORD STATNUM D (1) UTC time of observation (seconds) D (1) Integration time (seconds) M ( NWAVE ) Visibility - stored as a complex number M ( NWAVE ) Error in Visibility (complex ...

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 ...

... TFORM109= '1B ' / TUNIT109= ' ' / TDISP109= 'B1 ' / TTYPE110= 'PHBSIG ' / Platform converter combiner signal ph adjust TFORM110= '1B ' / TUNIT110= ' ' / TDISP110= 'B1 ' / TTYPE111= 'HYBRID ' / Platform converter combiner hybrid TFORM111= '1B ' / TUNIT111= ' ' / TDISP111= 'B1 ' / TTYPE112= 'PHBLO ' / Platform converter combiner LO phase adjust TFORM112= '1B ' / TUNIT112= ' ' / TDISP112= 'B1 ' / TTYPE113= 'XFNORMAL' / Control room transfer switch ...

XMM-Newton CCF Release Note XMM-CCF-REL-195 OM Photometry: Zero points, AB System and ux conversion factors A. Talavera September 19, 2005 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS ag OM COLORTRANS 0010 2000-01-01T00:00:00 Header keywords No 2 Changes The zero points used to compute the magnitudes in OM aperture photometry are given as keywords contained in the FITS header of the OM COLORTRANS CCF. ... HZ2 OM filter lambda AB_OM AB_Oke 1974 U 3440. ...

DIGITAL WDC EXCHANGE FORMAT . FOR OBSERVATORY 1.0 MINUTE VALUES 1. ... DATA-1 .. DATA-60 are 1-minute values of the given element for that hour. ... Typically, digital 1-minute values received by WDCs from organizations operating automatic magnetic observatory instruments are averages of more frequendy sampled values, e.g. 10-second point samples. ... If the method used to obtain 1-minute average values is important to a user, the WDC will assist in determining the exact procedure applied. ...

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 ...

... ORIGIN = 'ASC ' / Source of FITS file CREATOR = 'cxc - Version CIAO 2.2' / tool that created this output CHECKSUM = '78aM87YM77aM77YM' / HDU checksum updated 2003-01-07T20:23:55 DATASUM = ' ' DATE = '2003-01-07T20:23:25' / Date and time of file creation DATE-OBS= '2002-12-29T23:20:17' / Date and time of observation start DATE- END = '2002-12-30T10:13:33' / Date and time of observation stop TIMESYS = 'TT ' / ... DSVAL1 = 'TABLE ' / DM Keyword: Descriptor value. ...

splitxyz - filter to divide (x,y,z[, distance ,heading]) data into (x,y,z) track segments . splitxyz [ xyz [ dh ] file ] -C course _ change [ -A azimuth / tolerance ] [ -D minimum _ distance ] [ -F xy _ filter / z _ filter ] [ -G gap _ distance ] [ -H [ nrec ] ] [ -M ] [ -N namestem ] [ -S ] [ -V ] [ -Z ] [ -: ] [ -bi [ s ][ n ] ] [ -bo [ s ] ] ... If xy _ filter is non-zero, the data is first divided into segments and then the x,y values of each segment are filtered separately. ...

... Equinox of object coordinates BJ = 18.87 / bJ magnitude UMBJ = -0.69 / u - bJ colour BJMR = 0.22 / bJ - r colour NOBS = 1 / Number of 2dF observations available IS_ BEST = 'TRUE ' / TRUE if this file contains the best 2dF observa DATEBEST= '24/09/00' / Date of best 2dF observation (DD/MM/YY) ID_ BEST = 'QSO ' / ID from best 2dF observation QUALBEST= 11 / Data quality flag from best 2dF observation Z_ ...

... AstroImageJ (AIJ) .. ... Reads and writes FITS images with standard headers . ... Provides a time and coordinate converter tool with capability to update/enhance FITS header content (AIRMASS, BJD, etc.) ... Creates color images and with native ImageJ processing power . ... AstroImageJ_Updater . Update operation now updates AIJ version number in Info.plist CFBundleVersion and CFBundleShortVersionString (MacOSX only) . ... AstroImageJ is ImageJ with astronomy plugins and macros installed. ...

... A bright flare-up of emission (>1000 Jy) was found in OH-maser source during tests of 18cm receiver in observations with Kalyazin 64-m radio telescope (August 2004). ... Appendix (The list of used acronyms) ASC Cold Plate DC Astro Space Center of Lebedev Physical Instutute cooled LNAs and antenna feed hermetic device container (part of payload ); it contains Formatter, Rb oscillators, synthesizer, control unit and is placed under dish DM Device Module = DC + H-maser EGSE ...

The elements of the numbered minor planets are given with respect to the ecliptic and equinox J2000.0. ... In the Table these values are given to 0.01. ... A dash indicates that there is no opposition in 2015. 1 a.u., 1.017 a.u. 1 a.u., q <= 1.017 a.u.), At stands for Aten type ( a . ... It should be noted that all objects included into the Tables of NEAs, Centaurs and transneptunian objects, and some unusual planets can be also found in the Table of elements and opposition dates of all minor planets. ...

... 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. ...

RTT150 . Russian-Turkish 1.5-m Telescope . ... Until 2002 observations were mostly performed with ST-8E CCD in the 1:7.7 Cassegrain focus. ... In April, 2003 telescope was equipped with a larger-size CCD Andor DW436 . ... 2048 x 2048 pixels, . ... Since summer of 2002 the main focal detector of the RTT150 telescope was AP47p CCD in 1:7.7 Cassegrain focus. ... During September 3-13, 2002 works on installation of new autoguiding system ( photo 1 ) were carried out on RTT150 telescope. ...

ESO SCIENCE DATA PRO DUCTS STANDARD Do c . ... It applies only to imaging products. ... xtension 1 XTENSION= 'BINTABLE' / binary table extension 5 BITPIX NAXIS NAXIS1 NAXIS2 PCOUNT GCOUNT =8 =3 = 16392 =1 =0 =1 / array data type / number of array dimensions / number of bytes per row / number of rows / number of group parameters / number of groups / VO Data Model / VO Publishing Authority VOCLASS =' SPECTRUM V2.0' VOPUB TITLE OBJECT RA DEC = ' ESO /SAF' = 'M2549_30mx4_ ...