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Which orbital rocket has the smallest diameter?

Without fins.

Related question:

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    $\begingroup$ I'm betting it's Vanguard...or one of those wacky unguided early Japanese rockets $\endgroup$ – Anton Hengst Oct 27 '20 at 18:19
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    $\begingroup$ With or without fins? $\endgroup$ – SE - stop firing the good guys Oct 27 '20 at 18:29
  • $\begingroup$ Without fins better $\endgroup$ – Joe Jobs Oct 27 '20 at 19:12
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    $\begingroup$ It's probably the SS-520 again at 0.52 m diameter $\endgroup$ – Dragongeek Oct 27 '20 at 19:13
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    $\begingroup$ 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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