The morning star star is shown on the left.
Traditionally, a formed when the following conditions are met:
Prior to Day 1: a down trend exists. I characterize this be having three days with lower closes
Day 1 candle : Long and Dark. I have characterized this candle with a body that is atleast 65% of the candle length
Day 2 candle : This candle is the doji candle. The candle should gap down. The High of the candle needs to be less than the low of Day 1 candle. This is a doji, so the candle body should be less than 15% of the total candle length
Day 3 candle : This should be a white candle that gaps up. Since this is a white candle, the Close is higher than the Open. The Low of this candle should be higher than the High of the previous day candle