Xander Tielens (b. 1953) is a Dutch astronomer in Leiden, who after his PhD went to the US to become Project Scientist for the airborne observatory, SOFIA. Back in the Netherlands he continues his work on dust and the chemistry of interstellar matter.
Discovered on 24-9-1960 in Palomar by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T.