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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Shelyak eShel III Spectroscope

Shelyak eShel III Spectroscope

par Shelyak
UGC SHK-PF0011
$11,285.00 - $11,285.00
$11,285.00
$11,285.00 - $11,285.00
$11,285.00
Égalisation de prix!
  • Spectral Range: 390nm to 750nm
  • Instrument Type: Professional Echelle Spectroscope
  • Input: Fiber-Optic Fed
  • Design: Modular Core Component
  • Application Focus: High-Resolution Astrophysical Analysis
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  • Description
  • FAQ
  • Specifications
  • Downloads
  • Warranty

  • eShel III Spectroscope

    The Shelyak eShel III is a professional, fiber-fed echelle spectrograph designed for high-resolution analysis across a wide spectral range of 390nm to 750nm, enabling advanced research in topics such as exoplanetary science and stellar dynamics.

    Professional Echelle Spectroscopy from 390nm to 750nm

    The eShel III achieves its high resolving power by employing an echelle grating, which uses high diffraction orders to spread light out in great detail. A cross-disperser prism then slices this spectrum into successive orders, stacking them to fill the entire surface of a camera sensor. This technique allows the instrument to capture the complete visible spectrum from 390nm to 750nm in a single exposure, without sacrificing resolution at any point in the range.

    Fiber-Fed Design for High-Accuracy Radial Velocity

    Precision is paramount in spectroscopy, especially for radial velocity measurements used to detect exoplanets. The eShel III uses a fiber-optic feed to physically decouple the spectrograph from the telescope. This isolates the instrument from mechanical vibrations, flexure, and thermal fluctuations at the telescope, allowing it to be housed in a stable, temperature-controlled environment. This stability is the key to achieving the consistent, repeatable measurements required for professional research.

    The eShel III Core: Building a Complete Spectrographic System

    This product is the core eShel III spectroscope module and is not a standalone instrument. To create a fully operational system, it must be paired with a Fiber Injection and Guiding Unit (FIGU), a dedicated calibration module, and the required 50µm optical fibers for the target and calibration source. These components are available separately or as part of the complete eShel III system package. The entire system is controlled by the free Demetra software, which handles acquisition, remote control of the modules, and data reduction.

  • What is an echelle spectroscope and why is the eShel III designed this way?

    An echelle spectroscope uses a special grating at a high angle to achieve very high spectral resolution. This creates overlapping spectral orders, which a second optical element (a cross-disperser) separates and stacks vertically on the sensor. This design allows the eShel III to capture a very wide spectral range (390nm to 750nm) at high resolution in a single image, something a traditional single-order spectrograph cannot do.

    What additional components do I need to operate the eShel III Spectroscope?

    The eShel III Spectroscope is the central module of a larger system. For operation, you will require:

    • A Fiber Injection & Guiding Unit (FIGU) to inject the starlight into the fiber.
    • A Calibration Module for wavelength and flat-field calibration.
    • Two optical fibers (one for the star, one for calibration).
    • A compatible astronomical camera, such as the ATIK 460Ex.

    How does the fiber-fed design of the eShel III improve data quality for exoplanet hunting?

    Detecting the tiny Doppler shift in a star's light caused by an orbiting exoplanet requires extreme stability. By using an optical fiber, the eShel III can be placed in a temperature-controlled room, completely isolated from the telescope's movement, vibrations, and changing orientation. This prevents instrumental shifts that could mimic or mask the real stellar signal, ensuring the measured radial velocity is highly accurate.

    Can I use the eShel III for studying the spectral evolution of a variable star like BW Vulpeculae?

    Yes, absolutely. The eShel III is ideal for this type of research. Its ability to capture the entire visible spectrum at high resolution in a single exposure allows you to monitor changes in multiple spectral lines simultaneously over time. This is crucial for understanding the complex atmospheric pulsations and dynamics of stars like the Beta Cephei variable BW Vulpeculae.

    What software is required to control the eShel III and its modules?

    The entire eShel III system is controlled by Shelyak's Demetra software, which is available as a free download. Demetra manages spectra acquisition, controls the FIGU and calibration modules remotely, and includes tools for data reduction, from raw images to calibrated spectra.

    Is the eShel III Spectroscope a standalone instrument?

    No. This product is the core spectroscope module only. It is designed to be the heart of a complete spectrographic system and requires the additional components listed above for operation. Shelyak offers a complete package that includes all necessary modules for a functioning instrument.

  • Instrument Type Fiber-Fed Echelle Spectroscope
    Spectral Range 390nm to 750nm
    Input Connector Type FC/PC
    System Requirement Requires FIGU, Calibration Module, and Optical Fibers (sold separately)
    Control Software Demetra (Free Download)
  • Shelyak 1-Year Warranty