Which orbital rocket has the smallest diameter?

Without fins.

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  • 2
    $\begingroup$ I'm betting it's Vanguard...or one of those wacky unguided early Japanese rockets $\endgroup$ Oct 27 '20 at 18:19
  • 3
    $\begingroup$ With or without fins? $\endgroup$ Oct 27 '20 at 18:29
  • $\begingroup$ Without fins better $\endgroup$
    – Joe Jobs
    Oct 27 '20 at 19:12
  • 4
    $\begingroup$ It's probably the SS-520 again at 0.52 m diameter $\endgroup$
    – Dragongeek
    Oct 27 '20 at 19:13
  • 2
    $\begingroup$ Yeah, I'd put my money on the SS-520, but I'd have to do some research. Some of the rockets under design, but not yet launched may be even smaller. $\endgroup$
    – Carlos N
    Oct 28 '20 at 12:40

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