A one hour construction spectrograph and spectra

[Christian Buil]

Hi Robin,

The magnitude of the objects is crucial. You and me have a very polluted sky, this is not the case all amateurs, hopefully!

I believe that with a 50 micron fiber, and with my sky, I can capture without much problem spectra for star up to magnitude 11 by using a generic atmospheric spectrum, and producing an error not too significant .

For most faintest stars, dual fiber fed becomes helpful, it's clear. This is probably the case for magnitude range magnitude 11 to 14. It is a long work to realize such system, but it will be accessible for amateurs one days, I am sure...

For spectroscopy of ultra-faint objects (V = 14, 15, 16, 17, ...), low resolution spectrograph placed directly on the telescope is probably preferable because the setup is compact and lightweight (like SA, Alpy 600 ...).

Christian

[Miguel Rodriguez]

¿Could it be done, for example, with two objectives and an StarAnalizer? (and optical fiber connection of course)

¿would be achieved a good resolution?
I suppose results will be proportional to lens quality and line density of grid.