Antilhue - Chile

M 17 in H-Alpha
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Image Data

Designation M 17, NGC 6618, Omega Nebula, Swan Nebula
Constellation Sagittarius (Sgr)
Description M 17, the Omega nebula - also referred to as the Swan - is a beautiful emission nebula showing a figure 2 shape. It was discovered by Messier in 1764 and lies about 6000 lightyears from earth.  This image was generated as a test of the ALT5 mount's guiding performance and lacks composition and calibration frames.

See a colour rendering of M 17 here and another H-Alpha image taken with a 14.5" Ritchey-Chrétien telescope here.

Exposure Ha 6 x 15 min @ -20°C
Camera SBIG ST-10XE selfguided,  SBIG CFW-8 with Custom Scientific 4.5 nm Ha filter
Optics Intes Micro MN106 10" Maksutov-Newton @ f/5.5 (prime focus)
Mount ALT-5 ADN German Equatorial Mount with FS-2 controller
Software MaxIm DL/CCD, Registar, Adobe Photoshop 6.0
Location - Date - Time San Esteban (Chile) - 04Jun2003 - 04:00 UTC
Conditions Transparency 8,  Seeing 5-6, Temperature 7°C