CTIO: Cerro Tololo Inter-American Observatory
ESO: European Southern Observatory
GRO: Gamma Ray Observatory
HEAO: High-Energy Astronomy Observatory
HESS: High Energy Stereoscopic System
HRSO: High-Resolution Solar Observatory
ISO: Imaging Spectrometic Observatory
KPNO: Kitt Peak National Observatory
LDEO: Lamont-Doherty Earth Observatory
LRO: Large Radio Observatory
LSO: Large Solar Observatory
NAOJ: National Astronomical Observatory of Japan
NOAO: National Optical Astronomy Observatories
NSO: National Solar Observatory
OAO: Orbital Astronomical Observatory
SOHO: Solar and Heliospheric Observatory
STEREO: Solar TErrestrial RElations Observatory
STO: Solar Terrestrial Observatory
VERITAS: Very Energetic Radiation Imaging Telescope Array System