First of all, a warm welcome Mr & Mrs van der Velden, I hope you are both well. Please say hello to Ilse (Erwin’s sister) and her husband, both of who I met at the Qld Astrofest in 2006.
Here is a link to the
post from westsky (David) that broke the very sad news of Erwin’s sudden passing. In that post, there are several tributes and off-site links that honour Erwin’s memory.
Cheers
Dennis