About: http://webisa.webdatacommons.org/57244915

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	From this I concluded the empty weight.I also wanted to include Lunar Orbiter, but no data except for the total weight are given, The same holds for the russian Lunas.
http://www.w3.org/ns/prov#wasQuotedFrom	spacefellowship.com