
                         "Astrometrica" Demo Images
                        ============================

  The demo images on the disk have been taken at the private observatory
  Obermair/Meyer (IAU observatory code 540), located north of Linz, Austria,
  at 48.4425 N, 14.2753 E, 815m above sea level. They were taken using
  a SBIG ST-6 CCD at the prime focus of a 0.3m f/5.2 Schmidt-Cassegrain
  telescope. The field of view, thus, is about 15' x 20', and the pixels size
  is 3.7" x 3.2".


   C95O1-1.ST6, C95O1-2.ST6
  ==========================

  The first image, C95O1-1.ST6, was taken on July 25, 1995, only three days
  after comet C/1995 O1 (Hale-Bopp) has been discovered. Brian G. Marsden, 
  director of the Minor Planet Center, noted in an article in "CCD Astronomy"
  (fall 1996 issue): "Amateurs contributed 50 of the 63 positions [of comet
  Hale-Bopp] published in IAU Circulars between July 24th and 26th. All were
  obtained using CCDs, and the reductions were completed within an hour of
  actual observation - in most instances using Herbert Raab's Astrometrica
  software. It was never this way in the 'photographic era', when the
  accumulation of astrometric observations was an arduous process and very
  much the province of professional astronomers."

  The second image, C95O1-2.ST6, was taken on July 29, 1996, approximately
  one year after the first image: When displayed at high contrast, the coma
  of the comet now fills nearly the whole field of view. 

  Please read the "Tips and Suggestions" section in "Astrometrica's" README
  file on how to measure precise positions of comets.


   96OH-1.ST6, 96OH-2.ST6
  ========================

  These images of minor planet 1996 OH were taken on XXXX XX XXXX, five days
  after 1996 OH has been discovered by George R. Viscome at Rand Observatory,
  Lake Placid, USA (IAU observatory code 816). This minor planet, which
  orbits the sun within one of the Kirkwood gaps in the asteroid belt, was
  then located about 10' east of the near eart asteroid (4179) Toutatis,
  so both can be seen on this image.

  Use "Astrometrica's" blink comperator to identify the two minor plantes
  among the stars in these images. Note that 1996 OH is near a bright star
  in the second image, which makes it quite difficult to measure the precise
  position of this faint object.

  Remember that you may use the 'Measure - Remeasure' command to measure the
  position of a second object on an image. Use the 'Epehem - Load Elements'
  command to load the orbital elements of the second object, or use the
  'Utility - Edit Parameters' command to enter the object's designation.

  Also, note that these images were taken using the "Track and Accumulate"
  mode of the ST-6. You may use the 'Mid-Exposure' button, displayed in the
  'Edit Parameters' dialog immediately after the image has been loaded, to
  calculate the time of mid-exposure. Six snapshots, with 34 seconds exposure
  time each, have been taken, as follows:

                     File:   96OH-1.ST6     96OH-2.ST6
       Start of Snapshots:    21:07:27       21:18:01
                              21:09:04       21:19:21
                              21:10:02       21:20:19
                              21:11:02       21:21:19
                              21:12:02       21:22:19
                              21:13:02       21:23:19
                              21:14:03       21:24:20
                              21:15:03       21:25:20
                             ----------     ----------
  Calculated mid-exposure:    21:11:45       21:22:04

