No future Astros, only former Astros with birthdays today ~
OF Moises Alou (46)
Originally drafted by the Pirates as the second overall pick in 1986, Alou came to Houston in a November 1997 trade with the Marlins. In 421 games for the Astros in 1998, 2000 and 2001, he hit .331/.403/.585 with 93 doubles, eight triples and 95 home runs. Alou was a six-time All-Star including his 2001 season with Houston. He also won the Silver Slugger award (for the second time) for Houston in 1998.
OF/1B Danny Heep (55)
A second round pick by the Astros in 1978, Heep played in 165 games for Houston from 1979 to 1982, hitting .246/.314/.344 before being traded to the Mets for Mike Scott. Heep was used mostly as a bench player and pinch hitter throughout his career which netted him World Series rings with the 1986 Mets and the 1988 Dodgers.
RHP Matt Keough (57)
Originally drafted by Oakland in the seventh round in 1973, Keough came to Houston at the end of his career, signing as a free agent in June 1986. In 10 games for Houston (5 starts), he was 3-2 with a 3.09 ERA and a 1.143 WHIP. Keough was a one-time All-Star for Oakland in 1978.
LF/1B Jack Daugherty (52)
Daugherty came to Houston as a free agent in January of 1993 and was traded to the Reds in July of that year. He only played in four games for Houston, getting three at-bats and one hit for a .333 batting average. His best season was his 1990 season with the Rangers when he hit .300/.347/.435 in 125 games.