JKT-Main
optics
Authors:
M.F.Blanken
Revision
0.2 04/10/00
Revision History
0.1Firstdraft
Filename: \\Ormnt1\Group_Area\Optics\Master_Documents\JKTMain.doc
Owner: M.F.Blanken
Optical specifications *
Mechanical specifications *
Cleaning *
Measurements *
Aligning *
Aluminising *
Reference: *
http://www.ing.iac.es/Astronomy/telescopes/jkt/index.html
Shape |
Working Diameter (mm) |
Asphericity |
Focal length (mm) |
Separation from primary (mm) |
|
Primary |
Concave Parabolic |
1000 |
-1 |
4596 |
|
F/8 Secondary |
Sphere |
477 |
0 |
4381 |
2738 |
Secondary f/15 |
Convex Hyperbolic |
307 |
-3.545 |
1811 |
3342 |
Afocal doublet |
sphere |
326 |
|
Afocal |
914 |
Finder (doublet) |
sphere |
200 |
|
|
|
Focal Station |
Harmer-Wynne |
Cassegrain |
Finder |
Focal length (mm) |
8060 |
15000 |
3250 |
Focalratio |
F/8.06 |
F/15 |
F/16.25 |
Field diameter (arcmin) (no vignetting) (50%vignetting) |
90 93 |
34 50 |
10,30,90 (2) |
Scale (arcsec/mm) |
25.6 |
13.8 |
63.5 |
Diameter of central obstruction (mm) |
618 |
406 |
63.5 |
Focus/mirror shift (1) |
4 |
11.7 |
|
Element |
Shape |
Total Diameter (mm) |
Expn. Coef. (1/K) |
Material |
Primary |
Concave Parabolic |
1000 |
0.1±0.1x10-6 |
Cervit |
F/8 Secondary |
Convex Sphere |
477 |
-0.7x10-6 |
Zerodur |
F/15 Secondary |
Convex Hyperbolic |
307 |
-0.7x10-6 |
Zerodur |
Afocal doublet |
Sphere (doublet) |
326 |
|
UBK7 |
Finder |
Sphere (doublet) |
200 |
|
|
Dates of snowcleaning
Document of the snowcleaning
Measurements of snowcleaning before and after
Aligning
Documents of the aligning procedures
Dates of last aluminising.
Measurements before and after the aluminising.
D.Carter, U.Sharan & R.E.S.Clegg