I seriously therefore doubt all the posts about the Earth, even the nightside of the Earth, being too bright for Hubble to image. Too bright? Reduce your shutter speed !
The Hubble has looked at the Earth before, technically -- the light from it was used to establish the point-to-point illumination pattern on the CCD. THe pictures aren't very useful though, as the HST is moving far too fast to keep an object stationary in the camera; in fact, the Earth pointings are called "streak flats" due to the Earth's surface moving through the field of view. Presumably the KH satellites are designed to overcome this limitation as well as others
(CCD particulars, filters, guidance system...)
Oh yeah, IAAHSTUser...
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I seriously therefore doubt all the posts about the Earth, even the nightside of the Earth, being too bright for Hubble to image. Too bright? Reduce your shutter speed !
The Hubble has looked at the Earth before, technically -- the light from it was used to establish the point-to-point illumination pattern on the CCD. THe pictures aren't very useful though, as the HST is moving far too fast to keep an object stationary in the camera; in fact, the Earth pointings are called "streak flats" due to the Earth's surface moving through the field of view. Presumably the KH satellites are designed to overcome this limitation as well as others (CCD particulars, filters, guidance system...) Oh yeah, IAAHSTUser...
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