Facility
- High Energy Stereoscopic System1
- Hipparcos11
- Hitomi1
- ICECUBE1
- INTEGRAL31
- IRAS15
- IRAS,AKARI,HSO,MSX,WISE1
- IRSF1
- ISO33
- ISON-NM Observatory1
- IUE18
- IXPE1
- Infrared Telescope in Space (IRTS)2
- Institute for Astronomy, University of Edinburgh1
- Instituto de Astrofisica de Andalucia2
- JAST803
- JST2502
- Jacobs University3
- Jacobs University Bremen1
- K22
