Hydrogen-alpha (Hα) filter, central wavelength 656.3 nm and 3 nm bandwidth.
[SII] filter of central wavelength 671.6 nm and 5 nm bandwidth.
[OIII] filter with central wavelength 500.7 nm and 3 nm bandwidth.
The observatory is an small astronomical facility located at 30 km of the Guadalajara city in Mexico, with an elevation of 1588m above sea level. The telescope consists of a 0.32 m reflector (Planewave CDK-12.5) mounted on a Paramount ME II, and SBIG STL-6303 CCD camera with a five position filter wheel.
There is a bunch of celestial objects known as emission nebulae, and their name arises from the fact that they are actually emitting their own light (as opposed to reflection nebulae, which shine by reflected starlight). The Orion Nebula, is one of the most common examples of emission nebula. Planetary nebulae are normally considered a separate class of objects than emission nebulae, since they represent a very different phenomenon (star death instead of star birth). Novae or Supernova remnants also fall into this category.
Narrowband filters are designed to capture specific wavelengths of light, specifically, emission nebulae, composed of gases that are emitting light. The atoms within the gas are being excited by energy from nearby stars (either the stars forming within the nebula, as in the Orion Nebula, or by the remnant of the dead central star in a planetary nebula). The energy imparted by the starlight causes electrons within the gas atoms to jump up to a higher atomic orbit.
We use Astrodon Narrowband filters of 49.7 mm diameter and round type unmounted. The transmittance is guaranteed >90% at the emission line.
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