moose;239779 wroteEvaluating the hand on its own - not suited, not connected. You are praying you have the best A at the table. You have 1/2 the table to act behind you. All of the stacks behind you are larger than you, including the blinds. One limper, unless his VPIP>21%, you are behind his range. M>5
The bolded is a pretty bad way to look at it. If the limper limped 100% and you flipped your cards up and jammed A9 you win money, since it's so strong with this amount of hands left to act that you figure to have the best hand a ton of the time on average. Stacks behind you, and how many to act are irrelevant when your shove is unexploitable (aka, your hand is so strong given your stack that they won't get dealt a stronger hand often enough to make your shove -EV).
If we're using a HUD, sure I look up his VPIP and limp % and make an easy decision. Assuming OP isn't using one or something, I would just assume that the limp is nothing. At the $2 level this is more than a safe assumption. At nearly every level it is. That's why people's PFR deviates from their VPIP, and that's why we can make money at this game, people are too loose/passive in general, on average. Without a read, it's a mistake to assume that this limp indicates anything other than a marginal-weak hand.
Using the push bot charts, you have >0.5% of the chips, 4 left to act behind so your M has to be less than 5.4 to profitably push and that's if you are opening the pot. There is already is one limper so even though it was close between folding/pushing before, it is for sure a fold now.
I'm not sure what charts you're using but the Nash equilibrium says that you can push up to at least 6M from the hijack. Nash assumes everyone is playing perfectly vs. your range. No one's playing even close to perfectly here, so we can safely assume that A9o is definitely profitable. The limper in general should make it more appealing to jam (especially when he limps MP and not EP) since he will fold >50% of the time, or call worse hands some % of the time.