===========================                         ============================
                         IMCCE - Observatoire de Paris 

		   	  /pub/ephem/asteroids/1982TA

                                 1996, october 11
===========================                         ============================

1982TA/

          This directory give informations and datas useless for the campaign
          of astronomical observations of the asteroid (4197) 1982TA. You will
          find ephemerides, celestial charts, predictions of stellar
          occultations and closes approaches, images, ... available for 
          observations during october 1996.

          The goals are :
             * to mesure astrometric positions of 1982TA to improve its orbit.
             * to mesure the asteroid Earth distance by triangulation between 3 
               places (france - canada - iles de la reunion).
             * to improve stellar occultation predictions for this asteroid.

AUTHORS : J. Berthier & al.

ADDRESS : IMCCE - Observatoire de Paris 
          77 av. Denfert Rochereau, F-75014 PARIS
          Phone: (1) 40 51 22 64 and 40 51 22 67   
          Fax:   (1) 46 33 28 34 
          e-mail: berthier@imcce.fr

CONTENTS:

        ephem/   : here are ephemerides and sky charts for october 1996.
                   Source: Nysa v2.0. - Bdl & ephem.prg for charts (A.Rouhan).
                   Files :
                    * C1982TA.ps  -> orbit of the asteroid from october 1st to
                                     october 31 1996.
                                     stars are from the PPM catalog.
                    * C1982TAp.ps -> orbit of the asteroid from october 10 to
                                     october 21 1996.
                                     stars are from the PPM catalog.
                    * E1982TA.nys -> geocentric astrometric J2000 ephemerides of
                                     1982TA from 01/10 to 01/11 with a step of
                                     12h.

        images/  : here are images of 1982TA taken by observators.
                   Source: D.Bergeron (bergeron@achilles.net)
                   Files :
                    * dt961005.jpg -> frame of 1982TA by D.Bergeron (05/10/96)
                    * dt961006.jpg -> frame of 1982TA by D.Bergeron (06/10/96)
                    * dt961011.jpg -> frame of 1982TA by D.Bergeron (11/10/96)
                    * dt961012.jpg -> frame of 1982TA by D.Bergeron (12/10/96)

        omc/     : here are results of a study of the differences between the 
                   observed positions and calculated one (O-C).
                   Source: observations: AUDE observational network
                           calculus: Nysa v2.0. - Bdl
                   Files :
                    * AL2P0geo.all -> solution of the fit :
                                      Criterion : L2 norm
                                      Polynome  : order 0
                                      Sample    : 2.7 en r.a. & 2.7 en dec.
                                      Validity  : geocentric J2000.0 frame
                    * AL2P0geo.aps -> graphic visualisation of the fit (postscript)
                    * P01982TA.AKL -> observed positions by A.Klotz.
                    * PO1982TA.BDX -> observed positions by B.Viateau.
                    * PO1982TA.CBO -> observed positions by C.Boivin.
                    * P01982TA.DBE -> observed positions by D.Bergeron.
                    * P01982TA.GSO -> observed positions by G.St Onge.
                    * P01982TA.JBO -> observed positions by J.Boussuge.
                    * omcgeoc.aps  -> graphic visualisation of the O-C taking all
                                      observations available.
                                      (geocentric J2000.0 frame)
                   Remark :
                     The solution proposed to improve the ephemeris of 1982TA for
                     the time of this campaign are values to add to the r.a. and
                     dec. in the frame defined by the Earth's mean equator and
                     equinox of the reference epoch (J2000.0).
                     Those corrections are : d(r.a.) = 0.0078"  +/- 0.0331"
                                             d(dec.) = 0.5120"  +/- 0.3669"


        predict/ : here are available stellar occultations predictions and close 
                   appraches predictions.
                   Source: Nysa v2.0. - bdl
                   Files :
                    * R1982TA.nys  -> close approaches predictions for 1982TA during
                                      october 1996.

  
================================================================================
User feed-back is encouraged. Unless otherwise specified, send comments and bug 
reports to:                    E-mail     : comments@imcce.fr
                               Fax        : (33) 1 46 33 28 34 
                               Postal mail: IMCCE - Observatoire de Paris
                                            77 avenue Denfert Rochereau
                                            F-75014 PARIS
================================================================================