Accession Number : ADA244065


Title :   Surveying with Charge Coupled Devices


Descriptive Note : Final rept. Jul 1986-Apr 1989


Corporate Author : ARIZONA UNIV TUCSON


Personal Author(s) : Gehrels, Thomas


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a244065.pdf


Report Date : Oct 1991


Pagination or Media Count : 65


Abstract : The 0.91-m 'Spacewatch Telescope' of the Steward Observatory of the University of Arizona on Kitt Peak is dedicated to scanning with charge-coupled devices (CCDs) during the dark half of the month. We explored six modes of using CCDs for searches of gamma ray bursters, debris in geosynchronous space, satellites of asteroids, brown dwarf stars, the tenth planet, comets, cometesimals, and various types of asteroids. In the process, we gained experience with cosmic rays and artifacts in CCD observations. Each of these topics is described. I especially note that the existence of cometesimals has not been confirmed by the Spacewatch Telescope. This paper describes a new discipline in astrophysics, 'scannerscopy', of surveying with a CCD rather than with photography at a Schmidt telescope. It uses the CCD in scanning rather than in sequencing of stare exposures as is done at most observatories. Usually we turn the drive off, but the scanning can be done with the telescope slewing. In any case, the motion on the sky is precisely followed by slaving the charge transfer of the CCD to the drift rate of the image, while the CCD is read out continuously during the observing. Our primary application of CCD-scanning is on moving objects such as comets and asteroids. We also do routine astrometry with CCDs, in a transit method, and this yields a precision of better than + or - 0.7 arcsecs.


Descriptors :   *CHARGE COUPLED DEVICES , SCANNING , MOTION , RATES , MOVING TARGETS , DRIFT , SURVEYS , ARTIFICIAL SATELLITES , PHOTOGRAPHY , CHARGE TRANSFER , ARIZONA , SKY , READ OUT TECHNIQUES , SLEWING , TELESCOPES , COMETS , ASTEROIDS , PLANETS , COSMIC RAYS , DWARF STARS , ASTROPHYSICS , BURSTING CHARGES , SPHERICAL ASTRONOMY


Subject Categories : Astronomy
      Electrical and Electronic Equipment
      Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE