1. Observatorio Isaac Aznar, Grupo de Observatorios APT C/La Plana, 44, 13, 46530 Puçol, Valencia, Spain
2. Instituto de Astrofísica de Canarias (IAC), C/Vía Láctea, s/n, 38205 La Laguna, Tenerife, Spain
3. Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
4. Astronomical Institute of the Romanian Academy, 5 Cuţitul de Argint, 040557 Bucharest, Romania
5. Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
6. Astronomical Institute, Academy of Sciences of the Czech Republic Friova 1, CZ-25165 Ondrejov, Czech Republic
7. Isaac Newton Group, Apt. de correos 321, E-38700, Santa Cruz de La Palma, Canary Islands
8. Observatorio de Sierra Nevada, Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas (CSIC) Apt 3004, 18080 Granada, Spain
9. Fundación Galileo Galilei, INAF, Rambla José Ana Fernández Pérez, 7, E-38712 Breña Baja, La Palma, Spain
10. Center for Solar System studies-Palmer-Divide Station, Landers, California, USA
11. Blue Mountains Observatory, Leura, Australia
12. Darling Range Observatory, Perth, Australia
13. JBL Observatory, Bathurst, NSW, Australia