X-files Ascension

[Darios Uclaray]

Thefollowing are brief descriptions of the individual entries in thetable above.Source Name: NAME, APPNAMEThe SSC source name is constructed as for PSC sources and is derived from its position by combining the hours, minutes and tenths of minutes of right ascension and the sign, degrees and minutes of the declination. In obtaining the minutes of right ascension and declination for the name, the positions were truncated. If sources within a field have duplicate positional names, they are distinguished by an appended letter (APPNAME), starting with the letter A. See Source Designations for IRAS Catalogs.Position: HOUR, MINUTE, SECOND, DSIGN, DECDEG, DECMIN, DECSECAs in the PSC, positions are given for the equinox 1950.0 and epoch 1983.5. Hours (HOUR) and minutes (MINUTE) of right ascension are given as integers while seconds (SECOND) are rounded to integer deci-seconds. The declination is given as a character sign (DSIGN) followed by integer values of degrees (DECDEG), minutes (DECMIN) and seconds (DECSEC).Position Angle: ANGLEThe position angle of the major axis of the SSC source error box expressed in degrees East of North.Flux Density: FLUX(4)Each of the four wavelengths has a NON-COLOR-CORRECTED flux density in units of Janskys (1 Jy = 1E-25 W m-2 Hz-1). Color correction for any spectral shape is possible. Quoted flux densities are the noise-weighted averages.Flux Quality: FQUAL (4)Each flux density measurement is designated high quality, moderate quality, or upper limit (FQUAL = 3, 2, or 1, respectively) based on the prescription discussed in Section III.C of the Explanatory Supplement. Flux Density Uncertainty: RELUNC(4), TLSNR(4)Each flux density measurement other than an upper limit has an associated uncertainty expressed in two ways; RELUNC is the uncertainty expressed as a 1 sigma value in units of 100x/ (see Section III.C.2). TLSRN is ten times the local signal-to-noise ratio (see Section II.C) as determined from the reference or confirming grid, whichever is least.Point Source Correlation Coefficient: CC(4)As discussed in Section III.B of the Explanatory Supplement, SSC sources can have point source correlation coefficients between 70-100%. These are encoded as alphabetic characters with A = 100, B = 99, ..., Z=75-70, one value per band. The quoted correlation coefficients come from the reference or confirming grids, whichever is higher, for high-quality sources.Flux Density Ratio: TRFLUX(4)As discussed in Section III.B, SSC sources can have flux density ratios 0.5 Positional associations are made with the PSC when SSC and PSC positions agree to within 60". The PSC catalog is assigned catalog number 41. The search box for associations with high precision stellar catalogs, 13 (SAO),15 (Bright Star catalog), and 24 (Two Micron Sky Survey with Improved Positions) is 28" x 180" rather than the 16" x 90"search box used for associations in the PSC.The search radius for associations with the Dearborn catalog is increased to 120". Table 2. Format of Overlapping Fields FileStartNameDescriptionUnitsFormatByte00GRID0Prime Ref. GridI505SPARE1 spare byte1A106GRID1Overlapping Field #1,I5Ref. Grid11SPARE1 spare byte1A112AOVLP1Overlapping Sky CoverageArcmin^2I416-2Repeat of 5-15 for OverlappingField #217-27Repeat of 5-15 for OverlappingField #3...60-70Repeat of 5-15 for OverlappingField #571-79SPARE9 spare bytes9A1---- New Record ----80-85SPARE6 spare bytes6A186-96Repeat of 5-15 for OverlappingField #6...The quantities in the Overlapping Fields List are as follows:Prime Reference Grid: GRID0The grid against which other reference grids are checked for overlapping sky coverage.First Overlapping Grid: GRID1The number of the first reference grid with more than 5% overlap with GRID0.Overlap Area: AOVLP1Area of overlapping sky coverage between GRID0 and GRID1 in square arcminutes.

The format is repeated for each additional grid overlapping with GRID0. If more than 5 grids overlap with GRID0, they are listed in succeeding records, as necessary; the first six bytes of each of these additional records begins with a string of 6 spaces.

DESCRIPTION'attconvert' is a mission-independent tool for converting attitude files from one formatto another. It supports three formats: Quaternion [x, y, z, real], Z-Y-Z Euler angles and Pointing angles(Right Ascension, Declination, roll). Note that the tool renormalizes any input values for input values in quaternion format and rescales input angles as necessary (value outside range) 'attconvert' works in two modes: 1. Single point mode: 'input' parameter is a list of components separated by a comma. The 'inform' parameter is used to specify the format of the input list.The output formats are written both to stdout and to the output component parameters (the hidden parameters: 'quatx', 'quaty', 'quatz', 'quatr', 'eulerphi', 'eulertheta', 'eulerpsi', 'outra', 'outdec' and 'outroll' for the three different formats supported). 2. FITS file mode: In this mode, the 'input' parameter is a FITS file containingthe column(s) to be converted. The column(s) name(s) for both the input and the output file are specified with the 'incol' and 'outcol' parameters respectively. If not present, the columns are created in the outfile. PARAMETERSinput [string] Either a comma-delimited list of the input attitude components or the attitude filename containing the columns to be converted. inform = EULER [string]Input attitude format. Allowed values are: QUAT, EULER or POINTING. The default is EULER. (outfile='att_out.fits') [string]Output file name. This parameter is needed and used only in FITS file mode. (outform = EULER) [string]Output attitude format(s) for FITS file mode. Allowed values are QUAT, EULER or POINTING or a list of these values.Use commas asseparators in a list of more than one format. The order of the formatnames must match the order of the corresponding column names in theoutcol parameter.(outcol=QPARAM) [string]Name of the output attitude column(s) used in FITS file mode. Usecommas as separators in a list of more than one column. The order ofthe column names must match the order of the corresponding formatnames in the outform parameter.(alignfile = "NONE") [string]Name of the alignment calibration file. The alignment file specifies therotation between the telescope and spacecraft axes and also specifies the rollconvention. The roll may be extracted from the 3rd Euler angle "psi" by 'roll = ROLLSIGN * (psi - 90 + ROLL_OFF)'. If a file is not supplied and the parameter is either 'NONE' (Default) or 'STANDARD', the code uses an identity matrix as the rotation matrix and sets 'ROLL_OFF = 0'. If 'alignfile=NONE', 'ROLLSIGN = +1'.If 'alignfile=STANDARD', 'ROLLSIGN = -1'. This is the configuration for Hitomi, Swift, and Suzaku. If an alignment file is specified, the pointing anglescorrespond to the spacecraft z-axis pointing. If a TelDef fileis specified as an alignment file, the pointing angles correspondto the instrument pointing. This type of fileincludes the roll definition and the alignment matrixcomponents as standard keywords.(attext = ATTITUDE) [string]Name of the attitude extension of the attitude file, for FITS File Mode.(incol = EULER) [string]Name of the existing attitude column, for FITS File Mode.(quatx = 0.0) [real]Value of the output quaternion x-component, for Single Point Mode.(quaty = 0.0) [real]Value of the output quaternion y-component, for Single Point Mode.(quatz = 0.0) [real]Value of the output quaternion z-component, for Single Point Mode.(quatr = 1.0) [real]Value of the output quaternion real component, for Single Point Mode.(eulerphi = 0.0) [real]Value of the output first Euler angle (phi) in degrees, for Single Point Mode.(eulertheta = 0.0) [real]Value of the output second Euler angle (theta) in degrees, for Single Point Mode.When theta is 0 or 180 degrees, there are an infinite number of first and third Euler angle pairs that represent the same rotation. In these cases, the output Euler angles may be displayed in an alternative but equivalent representation.(eulerpsi = 0.0) [real]Value of the output third Euler angle (psi) in degrees, for Single Point Mode.(outra = 0.0) [real]Value of the output right ascension in degrees, for Single Point Mode.(outdec = 90.0 ) [real]Value of the output declination in degrees, for Single Point Mode.(outroll= 270.0) [real]Value of the output roll in degrees for Single Point Mode.(clobber = no) [boolean]Overwrites the existing output file if set to yes (yes/[no]).

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