WTTM means WIYN
Wisconsin, Indiana University, Yale University, and NOAO National Optical Astronomy Observatories Observatory Tip-Tilt Module in
Astronomy
Similar to WTTM
B-V - Binary - Variable star
BAV - Bundesdeutsche Arbeitsgemeinschaft fur Veraenderliche Sterne
BBH - Big Black Hole
BBT - Big Bang Theory
BCG - Blue Compact Galaxy
BD - Brown Dwarf
BE - Bright Elements
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