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Fuel Vent From SpaceX Rocket Explains Evening Glow Over Eastern Germany

Germany's CENAP traced the display to a Falcon 9 upper stage, with vented propellant crystallizing to reflect sunlight.

Overview

  • CENAP said the bright phenomenon seen around 17:30 local time was caused by a Falcon 9 upper stage releasing residual propellant.
  • Reports and photos arrived from across northeast and southeast Germany, including Berlin, Dresden, Görlitz and Zwickau.
  • Witnesses described a small point becoming a bright streak and then a diffuse cloud that moved slower than an airplane with steady light.
  • The rocket lifted off about three hours earlier from Vandenberg into a sun-synchronous orbit on SpaceX's Twilight mission carrying small satellites, including NASA's Pandora.
  • Investigators characterized the display as a routine post-launch effect of illuminated ice crystals from fuel venting, with no indication of alternative causes.