dba_scheduler issue

 I Created the job at 10AM as below

SQL> begin
dbms_scheduler.create_job(
job_name=>'SAMPLE_JOB',
job_type=>'EXECUTABLE',
job_action=>'/u000/app/oracle/rman/test.ksh',
start_date=> '27/AUG/2009 10:17:45 AM',
repeat_interval =>'FREQ=HOURLY;INTERVAL=2',
enabled => true,
auto_drop=>false,
comments => 'sample job'
);
END;
/
 
PL/SQL procedure successfully completed.
 
select * from dba_scheduler_jobs where job_name='SAMPLE_JOB';

JOB_NAME             JOB_ACTION                                                   START_DATE                                         NEXT_RUN_DATE
-------------------- ------------------------------------     -----------------------------------      -------------------------------------------------
SAMPLE_JOB           /u000/app/oracle/rman/test.ksh                               27-AUG-09 10.17.45.000000 AM -04:00                27-AUG-09 10.17.45.000000 AM -04:00

At 10:30 AM, I see the job is not executed as below. What might be the issue