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Daisy providing zero documentation. One from outer space, maybe? (8)

Daisy - aster

Hard rock starts as space travellers Earth rejected offer immediate departure (8)

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Spike you beat me to it but I'll submit anyway

Rock piles free of iron, gold, hydrogen and sulphur but sprouting Galatella linosyris (8)

Haemorrhoids minus a few elements + 'aster'

Somehow it soared to become an orbiting object in space (8)

Eliminating echo from sound system requires outside funding. It's astronomical! (8)

spike2 @10
You are thinking of "Trojan" asteroids. They are most numerous associated with Jupiter, but Uranus has at least one. However, as you say, they follow the same orbit around the sun as their planet, but don't actually orbit the planet itself.

@Spike 10;

Latitude or altitude?

I got roasted badly under this occasional air heater (8)

Fashion designer makes comeback with some tasteful clobber that's heavenly! (8)

Don't count this as an entry, because I was working on a similar idea to spike's, but he got it done first.

Fashion designer in comeback after East damaged psyche perhaps. (8)

DBE. There is an asteroid named Psyche in the main asteroid belt.