The following astronomers and friends came on all or part of the IWCA:
George Alcock, John Alcock, Doug & Barbara Biesecker, Nicolas Biver, Tom Boles, Owen Brazell, Bernd Brinkman, Guiseppe Canonaco, Kazimieras Cernis, Marie-Jose Danhiez, Frances Darroch, Kenelm England, Richard & Nicky Fleet, Stephane Garro, Dan Green, Alan Hale, Werner Hasubick, Sebastian Hoenig, Guy Hurst, Michael Jager, Nick James, Andreas Kammerer, Xavier Leprette, Bill Liller, Angel Lopez, Don & Laura Machholz, Joe Marcus, Brian Marsden, Salvador Sanchez- Martinez, Jean-Claude Merlin, Maik Meyer, Herman Mikuz, Carmelita Miranda, Martin Mobberley, Philippe Morel, Charles Morris, Neil Morrison, Bob Neville, Simona Nikolova, Janine Paccioni, Andrew Pearce, Helene Reyss, Bianca Rembrandt, Juan Rodriguez, David & Margaret Seargent, Jon Shanklin, Patrick, Meg & Kyle Stonehouse, Gyula Szabo, Kesao Takamizawa, Keith Tritton, Cliff Turk, Miguel-Antoni Villalonga, Frans, Rene & Maarten Van Loo, Rene Verseau, Bill Ward, Kay Williams.