I'm not sure about the exact weight but perhaps an estimation can be derived from the specifications available in the fact sheet [1] - Contractor: Galileo Avio

I'm not sure about the exact weight but perhaps an estimation can be derived from the specifications available in the fact sheet [1] - Contractor: Galileo Avionica SpA - Cells Type: Si, Hi-ETA LILT - Cells Size: 3x3 cm2 - Power equiv. @ 3 AU: 32W - Total Size: 2.2m2 - Lifetime: 10 years [1] - http://www.dlr.de/rd/Portaldata/28/Resources/dokumente/rx/Philae_Lander_FactSheets.pdf http://www.dlr.de/rd/Portaldata/28/Resources/dokumente/rx/Ph...