In general, sRGB is the standard and will display properly anywhere on the web. Adobe RGB is another option with wider gamut, but may end up with odd results. You can find many articles if you search google on the topic, here is one typical
example. I don't know about Astrobin specifically, but I assume this general advice is correct for Astrobin. I do use sRGB for all my images,
@Rick Veregin , and when I save the final jpg or tiff, I always make sure I save the sRGB profile with the image.
Thus, sRGB is safe, other profiles are better if you really know what you are doing and have total control of the process to the final product.
CS
Rick