BE1900 WAS BEING MOVED ON THE RAMP FOR PREFLT CHK AND ENG RUN-UP. CAPT ONLY CREW MEMBER ON BOARD. DURING PUSHBACK AND WHILE CAPT STARTED ENGS; MARSHALLER DISCONNECTED AND THE ACFT MOVED ON ITS OWN; STRIKING ADJOINING ACFT WINGTIP. NO SIGNAL BY THE CAPT TO DISCONNECT.

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I WAS BEING PUSHED BACK FROM GATE ON THE RAMP (PART OF THE B CONCOURSE) AT DEN. THE NIGHT BEFORE IT HAD SNOWED SO SOME SNOW WAS ON THE WINDSHIELD THAT COULD NOT BE CLRED OFF BY THE WIPER BLADES. I HAD A CLR VIEW OF THE RAMPER; HOWEVER; AND GAVE HIM AN 'OPEN FIST' SIGNAL MEANING THE PARKING BRAKE WAS OFF AND I WAS READY TO BE PUSHED BACK. NO PAX OR A FO WERE ON BOARD SINCE THE INTENT OF THIS PUSHBACK WAS SOLELY FOR ME TO TAXI TO A PLACE ON THE RAMP TO PERFORM A FIRST FLT OF THE DAY RUN- UP. THE PUSHBACK BEGAN AND I WAS CLRED TO START THE L ENG AND AFTER MAKING SURE IT WAS CLR I STARTED THE L ENG. AT THIS POINT I WAS MONITORING THE ENG START; TURNING ON THE L GENERATOR WHILE MAKING SURE CERTAIN ANNUNCIATORS EXTINGUISHED TO SHOW THE GENERATOR HAD COME ON LINE. I THEN REACHED UP TO THE OVERHEAD PANEL TO CHK THE VOLTMETER. JUST AFTER CHKING THE VOLTMETER; I THEN REALIZED I WAS ROLLING. THE L PROP OF THE PLANE I WAS IN STRUCK THE R WINGLET OF ACFT. I BRAKED HARD BUT COULD NOT STOP IN TIME. I THEN IMMEDIATELY SHUT DOWN THE L ENG. AT SOME POINT WHILE I WAS STILL MONITORING THE ENG START; THE PUSHBACK HAD STOPPED AND THE RAMPER DISCONNECTED THE PUSHBACK CART FROM THE AIRPLANE WITHOUT MY KNOWLEDGE. MY FEET WERE NOT ON THE BRAKES AND I NEVER GAVE THE RAMPER A 'CLOSED FIST' SIGNAL MEANING THE PARKING BRAKE WAS SET AND HE COULD DISCONNECT. I DID NOT FEEL OR NOTICE THE MOVEMENT OF THE ACFT UNTIL IT WAS TOO LATE. THE ACFT ROLLED AT LEAST 50 FT BEFORE COMING TO A COMPLETE STOP. I FEEL THERE WERE 2 CONTRIBUTING FACTORS TO THIS INCIDENT. FIRST; I SHOULD HAVE KEPT MORE OUTSIDE SITUATIONAL AWARENESS AND LESS INSIDE THE COCKPIT. SECOND; THE RAMPER WAS TOO IMPATIENT IN WAITING FOR MY SIGNAL. THIS WAS MY FIRST DAY ON LINE AS A CAPT AND ANY PROCS WERE DONE IN A SLOWER MANNER THAN ANY OTHER CAPTS WITH MORE HRS IN THE BE1900.