The nearest found maser object is G78.468-0.182 (offset by 1.7" from input coordinates)
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display_aladin("307.9684655","39.3258775","G78.468-0.182","G78.468-0.182","20300+3909, 20300+3909, G078.4705-00.1830, IRAS 20300+3909","0")