What kind of objects is the LISA Spectroscope designed for?
The LISA Spectroscope is optimized for faint deep-sky objects. Its primary targets include comets, novae, supernovae, faint variable stars, distant galaxies, and quasars. It is an ideal instrument for pro-am research and scientific characterization of these challenging targets.
What kind of telescope do I need to use the LISA Spectroscope?
The LISA performs best with telescopes that have a fast focal ratio, around f/5. It can be used directly on instruments with this native focal ratio. For telescopes with longer focal ratios, such as most Schmidt-Cassegrains or Ritchey-Chrétiens (f/8 to f/10), you will need to use a focal reducer to achieve optimal performance.
How do I keep a star centered on the LISA Spectroscope's slit for long exposures?
The LISA Spectroscope features two key systems for this. First, its mirror slit allows you to see the starfield around the slit for easy initial positioning. Second, it has a dedicated C-mount guide port, allowing you to attach an autoguiding camera that sends corrections to your mount, keeping the target perfectly centered automatically.
Can I change the resolution of the LISA Spectroscope?
Yes. The LISA comes with a set of four interchangeable slits of different widths. Using a narrower slit provides higher spectral resolution, which is ideal for separating close spectral lines on brighter targets. A wider slit allows more light to pass through, which is better for capturing a signal on very faint objects at the cost of lower resolution.
How would I use the LISA Spectroscope to study a supernova like SN 2023ixf in the Pinwheel Galaxy (M101)?
For a faint target like a supernova in a distant galaxy, you would likely select one of the wider slits (e.g., 23µm or 35µm) to maximize light throughput. You would use the mirror slit to locate the supernova within M101 and position it precisely. For the necessary long exposures, an autoguiding camera attached to the C-mount port would be essential to ensure the target does not drift off the slit.
Can I use the LISA Spectroscope with my 8" f/10 SCT?
Yes, but you will need two accessories for optimal results. First, you'll need a focal reducer (e.g., 0.63x or 0.5x) to shorten your SCT's focal ratio to be closer to f/5. Second, for a secure mechanical connection to the SCT's rear cell, you will need a specific adapter like the Shelyak BA0027 variable T-adapter instead of the standard 2" nosepiece.
