... Analysis of in-orbit data closely follow the CSL data analysis. Stars with known astrometric positions are matched with their image centroids. ... The measured position, the expected position and the offset between the measured and expected positions are calculated and written into a file. ... select catalogued positions for different observations/pointings (e.g. positions of objects in photometric sequence) . ... The new distortion map was generated from in-flight observations of the G153 field. ...

STIS Instrument Handbook for Cycle 24 . ... Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 24 > Chapter 14: ImagingReference Material > 14.6 Image Mode Geometric Distortion . ... Image Mode Geometric Distortion . ... Geometric distortion and plate scales for the STIS imaging configurations have been measured on-orbit by observing star fields shifted to different positions in the field, following a procedure similar to that used for WFPC-2 (Holtzman et al., ... arcsec/pix) . ...

TUI supports the following offsets: . Object Arc offset by a given amount on the sky (i.e. along the arc of a great circle). ... Arc offsets are useful for moving a different portion of your object or a different nearby object onto the boresight . ... Object Arc XY this is identical to an Object offset except that it has been rotated to align along the instrument x-y axes. ... This is just like the Calibration XY offset, except that it is typically cleared when you slew to a new object. ...

... Up: Future Instruments and Telescopes, Tools . ... New Generation Astronomical Telescopes (NGAT), a class of telescopes designed to be operated remotely and robotically, require efficient methods for communicating images over heterogeneous and low-bandwidth data networks such as the Internet. ... Methods researched thus far involve the classification of astronomical images based on object parameterisation, progressive image transmission, and evaluation of existing image compression schemes. ...

... The sky system is specified with SKYSYS= and an integer number. ... If, for example, the input set has an equatorial system and you want position 0,0 also in ecliptical coordinates with epoch 1983.5, use: POS=0 0 SKYSYS=3 EPOCH =1983.5 Example: USER COORDS USER COORDS INSET=NGC4214 FREQ 29:34 Set NGC4214 has 3 axes RA-NCP from -127 to 128 DEC-NCP from -127 to 128 FREQ-OHEL from 1 to 63 USER COORDS POS=0 0 RA-NCP DEC-NCP FREQ-OHEL (DEGREE ) (DEGREE ) (KM/S ) 183.125 ( ...

... To compare images from different instruments it is desirable for them to have the same scale and orientation. ... Use for shrinking. im> imlintran casa casa_m 0. 0. 2. 2. # input image casa.imh is shrunk factor of 2 # and result put in casa_m.imh . ... im> magnify casa casa_m 0.5 0.5. To shift, specify the old and new position of the image center. im> imlintran casa_m casa_mt 0. 0. 1. 1. xin=256 yin=256 xout = 276 yout=456 # moves the image casa_m 20 pixels to the right and 200 pixels up. ...

... European Remote Sensing Satellite (ERS-1) was launched on 17 July 1991, and the follow mission ERS-2 (with the same sensors and an Ozone monitoring instrument added) was launched on 21 April 1995. ... ERS-2 has a fixed repeat cycle of 35 days, and follows ERS-1 tracks with one day's delay. ... Swath width is 102.5 km (telemetered), spatial resolution is about 25x25 m. The Advanced SAR (ASAR) instrument is carried by ESA's ENVISAT satellite launched on 1 March 2002. ... Swath . ... Spatial Resolution...

The polar oval complete and partially visibility for the optical instruments on board of the AURORAL PROBE are shown by different symbols . The polar diagram of the Spacecraft positions magnetic mapping during polar oval visibility for the UVAI and UVSIPS cameras. The polar diagram shows the Spacecraft corrected geomagnetic co-ordinates : co-latitude - local time . ... The real time visibility (Moscow time MT=UT+3h). Date is shown along the X-axis, the MT - along the Y-axis. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The low-resolution, Cassegrain mounted, FORS spectropolarimeter of the ESO Very Large Telescope is being extensively used for magnetic field surveys. Some of the new discoveries suggest that relatively strong magnetic fields may play an important role in numerous physical phenomena observed in the atmospheres as well as in the circumstellar environments of certain kinds of stars. ...