WTTM means WIYN
Wisconsin, Indiana University, Yale University, and NOAO National Optical Astronomy Observatories Observatory Tip-Tilt Module in
Astronomy
Similar to WTTM
BHAS - Black Hills Astronomical Society
BHB - Black Hole Bang
BIS - British Interplanetary Society
BLO - Bl Lac Object
BLOB - Binary Large Object
BM - Blue Moon
BMO - Black Moving Object
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