Opponent unknown.

What is hero's play here? Is this an easy reraise? If so, how much do I raise?

PokerStars No-Limit Hold'em, $2 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($500.75)
UTG ($88.95)
MP ($255.40)
Button ($521.60)
SB ($402.10)

Preflop: Hero is BB with T, J.
UTG calls $2, 2 folds, SB completes, Hero checks.

Flop: ($6) 9, 6, 8 (3 players)
SB bets $5, Hero raises to $16, UTG folds, SB calls $11.

Turn: ($38) Q (2 players)
SB checks, Hero bets $18, SB raises to $50, Hero ?