NASA Spaceflight.com by Tobias Corbett February 9, 2020
A Northrop Grumman Antares 230+ was scheduled to liftoff from the Mid-Atlantic Regional Spaceport (MARS) on Wallops Island, Virginia – before a scrub was called in the final minutes. The rocket is set to carry the automated Cygnus spacecraft on its 13th contracted resupply mission to the International Space Station (ISS).
It was scheduled to lift off from Wallops Pad 0A at 5:44 PM EST (22:44 PM UTC) – at the end of the launch window – lofting the Cygnus NG-13 spacecraft into orbit, ahead of an approximately two-day rendezvous with the ISS, where it will then be berthed to the ISS to resupply the three-person crew of Expedition 62. This will now take place on another day, due to a ground support issue during the late countdown stage.
The Antares rocket went verticle on the pad at approximately 1:30 AM EST.
Included in the scientific hardware is a small microscope, which will act as a technology demonstrator for a new type of electron microscope, an experiment which will test the relationship between phages and their bacterial hosts in microgravity and space conditions and an experiment that will help us gain a better understanding of the bone mass loss astronauts undergo on orbit.
More:
https://www.nasaspaceflight.com/2020/02/antares-cygnus-13th-iss-flight/
