EMB145 FLT CREW REJECTS TKOF DUE TO AOA 1 HEAT INOP. MAINTENANCE DISCOVERS AOA VANE IS MISSING AND IS LATER LOCATED ON FLOOR OF DEPARTURE JETWAY.

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ON TKOF OUT OF ZZZ WE ABORTED THE TKOF AT ABOUT 70 KTS DUE TO EICAS WARNING 'SPS 1-2 INOP' AND CAUTION 'AOA 1 HEAT INOP.' FOLLOWED CHKLISTS AND CONTACTED MAINT CTL. 'AOA 1 HEAT INOP' WOULD NOT CLR SO WE RETURNED TO GATE. UPON POSTFLT FO FOUND AOA 1 VANE MISSING. CALLED ATC TO ADVISE OF POSSIBLE FOD TO CHK FOR. MAINT ARRIVED AT ACFT AND BEGAN A SEARCH. WE FOUND THE AOA VANE LAYING ON THE EDGE OF THE JETWAY WHERE WE HAD BEEN PARKED. WHEN WE HAD ORIGINALLY ARRIVED IN ZZZ THE JETWAY WAS BROUGHT CLOSER THAN NORMAL TO THE ACFT; BUT I DID NOT FEEL IT STRIKE THE ACFT OR MAKE ANY CONTACT EXCEPT GENTLY WITH THE PADDED CANOPY. I LEFT THE ACFT TO ENTER THE TERMINAL AND WAS MET BY A SUPVR WHO ASKED WHAT TYPE OF ACFT WE WERE ON AND IF IT TOOK A JETWAY OR JETBRIDGE. SHE SAID OUR TYPE OF ACFT WAS RELATIVELY NEW TO THE GATES AND THE AGENTS NEEDED TO KNOW WHICH TYPE OF ACFT IS ARRIVING. THE FO DID NOT FIND ANY ABNORMALITIES ON THE WALKAROUND AND THE JETWAY WAS PULLED AWAY FROM OUR ACFT SEEMINGLY WITHOUT INCIDENT. I DID NOT FEEL ANY BUMP OR HAVE REASON TO SUSPECT THE ACFT OF BEING DAMAGED; BUT MY CONCLUSION IS THAT THE AOA VANE WAS EITHER DAMAGED ENOUGH BY THE ORIGINAL PLACEMENT OF THE JETWAY THAT IT FELL AWAY FROM THE ACFT AS THE JETWAY WAS PULLED AWAY; OR WAS DAMAGED AND REMOVED ENTIRELY AT THIS POINT; SINCE IT FELL DIRECTLY ONTO THE JETWAY AND REMAINED THERE UNTIL IT WAS LOCATED BY MAINT. OVER THE NEXT HR; A FEW AGENTS AND SUPVRS ARRIVED AT THE ACFT TO DEMONSTRATE HOW THE JETWAY SHOULD BE BROUGHT TO THE ACFT AND TALK ABOUT HOW MANY INCHES AWAY FROM THE FUSELAGE IT SHOULD BE. RECOMMEND TRAINING OF GATE AGENTS IN SPECIFICS OF PARKING JETWAYS ON EMB145 AS OPPOSED TO OTHER ACFT TYPES ARRIVING AT THE GATES. THE JETWAY OPERATOR WAS DOING HER WORK AS USUAL WITHOUT AN AWARENESS OF HOW CLOSE THE JETWAY SHOULD BE BROUGHT TO THE EMB145. I ADVISED OUR FLT ATTENDANT TO WATCH THAT OPERATORS DO NOT BRING THE JETWAY TOO CLOSE TO THE ACFT AND WILL BE KEEPING A MUCH CLOSER EYE ON THIS MYSELF AS WELL.