The Leuschner Thirty Inch Telescope
The Thirty Inch telescope was manufactured in the early 1960s by Tinsley Laboratories. Tinsley also
made the correcting optics for the flawed primary mirror of the Hubble Space
Leuschner Observatory Site
Longitude: -122 09.4 East
Latitude: 37 55.1 North
Elevation: 304 m
Limits of telescope motion
Someone must drive out to the telescope if a switch is activated. Be aware
of the following:
Secondary Mirror Focus Travel
- Don't point the telescope close to a limit.
- Turn tracking off when you are close to a limit or are not taking images.
- The offset command ignores the software limits listed above.
- The software allows you to point to Dec=64°, but the
switch will be activated at Dec=63°.
The focus indicator reads out in mils (1/1000 of an inch ). Secondary technical
- The home position is at 0 mils
- Typical IR camera focus is 595 mils
- Maximum travel is 1360 mils
- Values outside of 0 - 1360 indicate errors. To correct: tx
- There is backlash with the mechanism.
The telescope was re-collimated in the spring of 2001 by a group of graduate
students. For details, see here
and an alternate method by Dick Treffers here. Below is
a drawing of the Ritchey Chretien Optics (all dimensions are in inches).
- 30 inch diameter primary
- F:8 nominal
- 33 arc-second /mm scale
The telescope drive is discussed here
Below is a drawing of the mounting plate bolt circle (all dimensions are
Last updated on 2005 Sep 22 (jonah hare)