A dark albedo feature about across has been named Olbers in honour of Vesta's discoverer, but it does not appear in elevation maps as a fresh crater would, and its nature is presently unknown, perhaps an old basaltic surface.
Vesta discovered Olbers (named in his honor) which is a dark albedo on craters. It is thought of as an old basaltic surface and does not appear in elevation maps like fresh craters. It's nature is presently unknown.