A golf ball is around 4cm, and an arm's length is around 70cm. To be the same apparent size, it would have to maintain that same ratio. The atmosphere is like 50-100km thick (highest weather balloon flight was >50km) so you would have to be seeing it at a further distance than that.
So your asteroid would have to be at least several kilometers across. That approaching dino-killer size. You're definitely misremembering some part of this.
So your asteroid would have to be at least several kilometers across. That approaching dino-killer size. You're definitely misremembering some part of this.