Class I Comets/Asteriods?

[Kerb24]

I was looking through the localization folder of KSP, when I found this: 

Quote

#autoLOC_6011133 = Class I Objects are up to 250m in diameter, and have strange characteristics. Visit one before they are no longer available - you only have a limited time to do so!

and also: 

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#autoLOC_184782 = This seems to be a non-standard size class. Who knows what it'll look like?

I understand the second one is an error message from when something goes wrong determining the size of an Asteroid or Comet, but what is a Class I object, and why is there only a limited time to visit it? There also another Class, Class H which is the same size but not "strange." I've never seen anything higher than a Class F in the tracking station, and never heard anything about them. Does anyone have any information on these?

[Lt_Duckweed]

Class I comets are the largest comets, and always spawn on hyperbolic escape orbits from Kerbol.  So they swing by periapsis one time, then sail off into the distance, never to be seen again.

[Jebby Boi]

On 11/28/2022 at 2:27 PM, Kerb24 said:

I understand the second one is an error message from when something goes wrong determining the size of an Asteroid or Comet, but what is a Class I object, and why is there only a limited time to visit it? There also another Class, Class H which is the same size but not "strange." I've never seen anything higher than a Class F in the tracking station, and never heard anything about them. Does anyone have any information on these?

Check the KSP wiki's page on comets-it will explain your question.