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Research Links

(7 August 2011)

  Here are several links to various aspects of the research programs at BrightSkies Observatory. Note: the content is still missing or sparse on yellow links at this point in time.

Polar alignment, collimation, and periodic error correction.

Remotely controlling the telescope.

Filter and detector characteristics.

Transforming star field images to a standard system: the transformation coefficients for BrightSkies Observatory.

Investigations of short-period variable stars.


When Lightning Strikes!!

(27 June 2011)

When Things Go Wrong !

(29 January 2011)

Equipment Configuration
(12 December 2008)

  Bright Skies Observatory is home to a 12-inch Meade f/10 SCT classic mounted on a home-made, fixed-angle wedge and SkyShed pier. The pier is bolted to a 48-inch deep 12-1/2 inch diameter footing of 650 pounds of concrete. I use ACP Observatory Control with the telescope.

  I have an SBIG ST-7XME, a camera with a CCD detector similar to my old Pictor 416XTE, but with a completely different electronic interface. This camera uses a USB 2.0 interface that is both more reliable and provides significantly faster downloads. I use MaxIm DL/CCD to control the camera.

  Currently I use a (good) Meade f/6.3 focal reducer and a spacer to get a focal length reduction to about 55% (1630 - 1635 mm), with a resulting image scale of 1.14 arcsec per pixel and a field of view of 15' x 10'. The effective reduction depends on the both the distance of the reducer from the secondary mirror and the distance of the reducer to the CCD chip itself. Changes in ambient temperature change the effective focal length.

  The following equipment is mounted on the telescope, in order from the telescope tailpiece:

  a)  The f/6.3 focal reducer. The focal reducer is mounted inside the TCF-S focusing sleeve in an Agos adapter.
  b)  Optec TCF-S focuser (with digital readout), using FocusMax to automatically focus.
  c)  A very short T-thread spacer. (An AO-8 could go here instead.)
  d)  SBIG CFW-8A color filter wheel, with Hα, V, R, I and Clear filters.
  e)  SBIG ST-7XME CCD camera, cooled typically to -35C to -25C in the winter and -15C or -10C in summer, but not water cooled.

  With this configuration, the OTA will not swing through the forks, so I'm limited to observing objects that are south of declination 69°N.

  The roof opens and closes by hand. It takes a real tug to overcome the inertia of its 225 pounds. Once it's rolling, it rolls on the tracks pretty easily. The roof rolls off to the east, and the peak of the gable is just at the level of the more distant trees that block the view anyway, as seen by the telescope.