|
Hipparcos 3d Stereo Images
|
|
These 3d Stereo images were created using data from The Hipparcos and
Tycho Catalogues. The relative distances are calculated from the
Hipparcos parallax measurements and the star colours are generated
using the V magnitude and B-V values from the Catalogues. The following
star fields are available (in sets of 3):
| Arcturus (HIP 69673) |
Beta Hydri (HIP 57936) |
61 Cygni (HIP 104217) |
[PS] [PDF] |
| Gamma Draconis (HIP 87833) |
Groombridge 1830 (HIP 57939) |
Sirius (HIP 32349) |
[PS] [PDF] |
| Beta Doradus (HIP 26069) |
51 Pegasi (HIP 113357) |
X Sgr (HIP 87072) |
[PS] [PDF] |
| Alpha Perseus (cluster) |
Praeseppe (cluster) |
Coma Ber (cluster) |
[PS] [PDF] |
| Hyades (cluster) |
IC2391 (cluster) |
Pleiades (cluster) |
[PS] [PDF] |
The 3d stereo images for these fields are available in
Postscript (compressed with gzip, about 500kb)
or PDF(about 42 kb) format. Note that the PS version produces better
images than the PDF.
The images can be viewed on the screen, or printed and viewed on
paper copies. The effect will work for black and white prints, but is
better with colour copies. In each of the following examples, the
target object is at the centre of the field, which is about 6 ×
6°2. The target object is
projected to lie in the plane of the page or screen. Only objects from
the Hipparcos Catalogue are displayed.
Each field comprises 3 images which can be viewed in two distinct
ways:
- (1) Cover the leftmost of the set of three images, and use the
rightmost pair for "fused" free-eye imaging: view the page
from a distance of about 30 to 50 cm under good and uniform lighting
conditions. Focus on the images, but "relax" the eyes so that
they converge at infinity (imagine that you are staring through the
paper at a distant point, so that the left eye observes and focuses on
the left (middle) image, while the right eye observes and focuses on
the right image). Try to fix on a particular object until the depth
effect appears: when it does, the results are rather dramatic, and you
can roam across the field, examining the relative distances of the
various stars in it. Unfortunately, many people seem to be either
unable, or not patient enough, to find the effect. In this case, you
might try the second method
- (2) Cover the rightmost of the set of three images, and place a good
quality mirror, with a height of about 10 cm, midway between the
leftmost pair, perpendicular to the page, and with the reflecting
surface facing the leftmost image. With your head a few cm above the
top edge of the mirror, look at the right (middle) image with the
right eye, and look at the left (inverted) image, in the mirror, with
the left eye. You may need to experiment with the positioning of the
mirror, and your head, such that you have an unobstructed view of the
right image with your right eye, and of the full mirror image with the
left eye. Again, fix on a particular object until the depth effect
appears. The method is simpler, if slightly less dramatic, than the
fused method; it works because in focusing on the page the eyes
naturally try to converge, so that viewing the left image in the
mirror requires no particular muscular contortions.
|
|
Contact Us
Last modified: Mon Nov 1 11:36:39 MET 1999
|
|