... HST . ... Computing the true count rates for digital data. ... The following equation is used to find the count rate. x = ( raw counts / sample time ) . ... True count rates for digital data are corrected by using the first equation for a point source and the second for an extended source. a = ( y - pre_amp - darkrate ) / ( highvolt x pt_effic ) . ... True photocurrents (count rates for analog data) are corrected by the first equation for point sources and the second equation for extended sources. ...

... Omdetect classifies a source as being extended if its computed semi-major axis is greater than that of the point-spread function's semi-major axis (computed by using moments), by at least twice the error computed for the former. ... 1) The quantities the total raw pixel counts, total corrected raw pixel counts and the total raw background counts are initialised to zero. ... d) The total raw background counts is incremented by the value of the corresponding background-image pixel. ...

The pitch, roll, and focus errors of the telescope (measured and computed in AO9 survey and tilt sensor pitch,roll ) can be corrected by using the tiedowns. ... Tiedown positions to correct the pitch,roll, focus errors versus azimuth for za 2 through 20 degrees. ... The pitch, roll, and focus errors are plotted versus azimuth for za 1 to 20 degrees (the color changes every two degrees) . ... The pitch error is on the top and the roll error is on the bottom. ... The pitch and roll errors versus za. ...

Follow-up astrometry and recoveries are made with the ANU 40 inch (1.0-m) f/8 reflector at Siding Spring Observatory (IAU code 413). ... A routine follow-up of 2003 WY153 on 2003 Dec 15 became much more than routine when a faint object with unusual motion vector was found close to the target asteroid. ... During routine astrometry with the 1.0-m to improve the orbit of the Apollo asteroid 2004 CB, the asteroid was found on March 30 to have a short tail! ... Siding Spring Survey Main Page . ...

The HI line magnitude m21 has been corrected for self-absorption effect following Heidmann et al (1972) , with parameter kappa=0.031. The inclination needed to compute this correction is given as parameter incl . If inclination is higher than 89 deg the maximum correction is limited to -0.82 mag. Corrected flux at other wavelengths are given in the parameters: bt , it . The measured HI flux is m21 .

Next: Calibrate data Up: Basic widget procedures Previous: Reduce visibility data Contents . For the reduction of astrometric delays, corrections from atmospheric dispersion and array metrology have to be computed. ... Metrology correction can also be applied to the scan data later, in which case one would initialize these data before averaging. ... Due to the low SNR of the blue channels, R EDUCE D ELAYS P HASE E DIT can be used to flag these. ... I NIT Initialize (zero) metrology corrections . ...

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... The command is: % ratty [-s system] [-I incdir] [-D symbol] [-b] [-?] input output ``Input'' is a text file containing a mildly extended FORTRAN, whereas ``output'' is the resultant standard (?) code. ... The string following this flag indicates the target compiler. ... VAX/VMS FORTRAN compiler. cft . ... RATTY assumes that target compilers other than these are strict FORTRAN-77 compilers. ... The string following this flag indicates an alternate directory to search for include files. ...

... Step 1: The magnetic field line tracing from the satellite position up to magnetic equatorial plane using IGRF magnetic field model. Step 2: Tracing back from the point (produced on the Step 1) to the Ionosphere (by using only dipole magnetic field) . ... The magnetic field line tracing from the satellite position up to the Ionosphere (the stop trace altitude 110 km) using Main (dipole) + Extraterrestrial magnetic field model (for example, Tsyganenko [1987], or [1989], or [1990] ) . ...