Upgraded Cobbie 3 to Mining but...

[Hullblazer]

...now I've installed scoop, laser, cargo-space etc, I've not seen an asteroid except for a couple hurtling too fast to catch, going planet-side.

Are there sectors better for asteroids or does the game-genie hate me?

[Venator Dha]

Different systems have a different distribution of asteroids.
There's a couple of OXPs that can be helpful for miners:
Spara's Asteroid tweaks https://bb.oolite.space/viewtopic.php?f=4&t=17435 Edit: this is very useful for giving more targets and a better feel of an asteroid field (as per films)
Little Bear & Eric Walch's[wiki]Asteroid_Storm[/wiki] which it sounds like you've got if the fast planet bound ones were at Leesti.

[another_commander]

Not an Oolite Windows-specific subject, moving to Discussion.

[Hullblazer]

Thank you another_commander for the move, sorry to have gotten it wrong

Venator Dha, thank you too: I'll certainly install the Spara OXP and will put the sudden lack of asteroids down to Sod's Law, rather than malicious in-game mechanics!

[Norby]

[wiki]Icesteroids[/wiki] are nice and easy to spot by eyes out of scanner range also.