WTTM means WIYN
Wisconsin, Indiana University, Yale University, and NOAO National Optical Astronomy Observatories Observatory Tip-Tilt Module in
Astronomy
Similar to WTTM
AC - Ascendant Cusp
AC - Active Coronae
ACA - Atacama Compact Array
ACIT - Automatic Comet Imaging Telescope
ACRIM - Active Cavity Radiometer Irradiance Monitor
ACS - Advanced Camera for Surveys
ACT - Astrographic Catalog Tycho
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