Are there new astroid sizes?

[Souptime]

Im not sure, i know comets can get big but the near kerbin asteroids now spawn in up to I (Gargantuan) class. I dont have any mods that could add in asteroids except for maybe OPM and GEP (Grannus Expansion Pack), just added GPP (Galileio's planet pack) secondary (SO it orbits kerbol) yesterday so thats outta the question. Haven't found any comets yet even with a couple sentinels around eve and dres orbit. Please help! 

[Vanamonde]

Yes, there are additional roid sizes. I am not far enough in my current campaign to know how large, though. 

[Wobbly Av8r]

From what I've heard from others, if you put more Sentinel's in proper orbits, the more chance you'll have of the game spawning comets.