Baader BACHES Echelle-Spectrograph

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POA
SKU 2458600
  • Medium resolution échelle spectrograph
  • For telescopes 8”-24” f/10 telescopes.
  • Spectral range: from 392nm to 800nm (depends on sensor size).
  • Two interchangeable width slits: 25μm or 50μm, each 130µm long.
  • Spectral average resolving power R of 18,000 (25µm slit) and 10,000 (50µm slit)).
  • High mechanical stability
  • Can be used with CCD and DSLR cameras
  • Included red LED provides back slit illumination for easy slit identification.
  • Ready to accept either of two optional calibration setups. 
  • Factory tested and aligned.
Introduction

The Baader BACHES (BAsic éCHElle Spectrograph) is a medium resolution échelle type spectrograph for the observation of bright celestial objects with 20cm to 50cm 8"-24") aperture f/10 telescopes. It is easy to use, robust, versatile, and also works as a stand-alone instrument for solar or terrestrial spectroscopy. 

Baader BACHES echelle spectrograph attached to a Celestron Edge HD Telescope

Baader BACHES échelle spectrograph attached to a Celestron Edge HD Telescope

The BACHES’ main features are:

  • Optimised for telescopes 8”-24” aperture with f/10 focal ratio.
  • Spectral range from 392nm to 800nm (range depends on CCD sensor size).
  • Two interchangeable slits: 25μm or 50μm, each 130µm long.
  • Spectral average resolving power R = 18,000 (25µm slit) and R = 10,000 (50µm slit).
  • Compact and lightweight: only 1350g without camera.
  • High mechanical stability: <9μm spectrum shift on detector for worst telescope position (test with SBIG ST-1603ME)
  • Optimized for CCD with size of 15mm x 10mm, 9μm pixel size
  • (e.g. KAF-1603).
  • DSLR cameras can be used.
  • Included red LED provides back slit illumination for easy slit
  • identification.
  • Ready to accept either of two optional calibration setups.
Results

Here are some results with BACHES attached to a Celestron C14 and mounted on a 10Micron GM2000 HPS German Equatorial mount. 

 

Package Contents

BACHES ECHELLE-spectrograph - high-resolution Echelle-spectrograph with ports for autoguiding and remote calibration, incl. accessories and sturdy ABS-case.

Parts list:

  1. BACHES-spectrograph incl. M48 clearglass filter (#245 8416) for protection against dust,
  2. T-2 quick-changer (#2456313A),
  3. 1¼"-Stoppring (#1905131),
  4. VariLock-extension (#2956929),
  5. focusing eyepiece holder (#2458125),
  6. 1¼" Kellner eyepiece 20mm,
  7. SlitViewer for examining the slit, with M28,8mm-thread,
  8. locking tool for VariLock extension,
  9. cotton gloves and wooden stick to move the slit plate softly when changing the active slit,
  10. allen key 2,5mm,
  11. allen key 2,0mm,
  12. allen key 1,5mm,
  13. allen key 1,3mm.

BACHES Package Contents

 

 

Specifications
SKU (#) 2458600
USAGE Professional use in astronomical / scientific research and university student education (astronomical internships). Suitable for advanced amateur astronomers, who already have experience in star spectroscopy
SPECTRAL RESOLUTION average spectral resolution R = 18,000
OPTIMIZED SPECTRAL RANGE 392-800nm continuously (depending on sensor size)
BREAK-EVEN VALUE 10 mag. vis (50cm-telescope, S/N=20, 30min. exposure (see http://arxiv.org/abs/1406.2492)
MECHANICAL DESIGN Echelle-Spectrograph with high mechanical stability, FE designed, torsion deformation below 9μm at 180° rotation
FIELD SIZE optimized for sensor sizes ca. 15x10mm, 9μm Pixel (i.e. KAF-1603), usable with 7x4mm sensor sizes (i.e. ST-402) and DSLR‘s
ÖFFNUNGSVERHÄLTNIS DES KOLLIMATORS f/10
OPTIMIZED FOR FOCAL RATIO optimized for 8" to 24" f/10 telescopes (full resolution from f/8 to f/12)
ADAPTABLE TO CCD- and DSLR-cameras
SLIT SIZE changeable 25 and 50μm slits. Slit length 125μm
ILLUMINATION manual red LED for Slit-Focusing
SPECIAL FEATURES Including instruction for Spectra Callibration. solenoid switches between the light from the telescope and the ThAr calibrati on and fl atf ield lamp of the RCU
GUIDING PORT with 1¼“-connection for eyepieces, video- or guiding cameras
INCLUDED ACCESSORIES Standard: with ThAr lamp mounted on BACHES body (with separate power supply). 
Professional with Remote Calibraion Unit (RCU) with built-in ThAr lamp and halogen fl atf ield lamp remotely controlled via web interface
OPTIONAL ACCESSORIES 1.5x-barlow lense: to optimize ca. f/6.8-telescopes to f/10. Remote Calibration Unit (RCU) for professional callibration of Echelle Spectra

 

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